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linux_old1/kernel/audit.c

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audit: update pointer to userspace tools, remove emacs mode tags
2005-04-29 23:23:29 +08:00
/* audit.c -- Auditing support
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
* System-call specific features have moved to auditsc.c
*
* Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Written by Rickard E. (Rik) Faith <faith@redhat.com>
*
* Goals: 1) Integrate fully with SELinux.
* 2) Minimal run-time overhead:
* a) Minimal when syscall auditing is disabled (audit_enable=0).
* b) Small when syscall auditing is enabled and no audit record
* is generated (defer as much work as possible to record
* generation time):
* i) context is allocated,
* ii) names from getname are stored without a copy, and
* iii) inode information stored from path_lookup.
* 3) Ability to disable syscall auditing at boot time (audit=0).
* 4) Usable by other parts of the kernel (if audit_log* is called,
* then a syscall record will be generated automatically for the
* current syscall).
* 5) Netlink interface to user-space.
* 6) Support low-overhead kernel-based filtering to minimize the
* information that must be passed to user-space.
*
audit: update pointer to userspace tools, remove emacs mode tags
2005-04-29 23:23:29 +08:00
* Example user-space utilities: http://people.redhat.com/sgrubb/audit/
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*/
#include <linux/init.h>
#include <asm/atomic.h>
#include <asm/types.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/audit.h>
#include <net/sock.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
/* No auditing will take place until audit_initialized != 0.
* (Initialization happens after skb_init is called.) */
static int audit_initialized;
/* No syscall auditing will take place unless audit_enabled != 0. */
int audit_enabled;
/* Default state when kernel boots without any parameters. */
static int audit_default;
/* If auditing cannot proceed, audit_failure selects what happens. */
static int audit_failure = AUDIT_FAIL_PRINTK;
/* If audit records are to be written to the netlink socket, audit_pid
* contains the (non-zero) pid. */
The attached patch addresses the problem with getting the audit daemon shutdown credential information. It creates a new message type AUDIT_TERM_INFO, which is used by the audit daemon to query who issued the shutdown. It requires the placement of a hook function that gathers the information. The hook is after the DAC & MAC checks and before the function returns. Racing threads could overwrite the uid & pid - but they would have to be root and have policy that allows signalling the audit daemon. That should be a manageable risk. The userspace component will be released later in audit 0.7.2. When it receives the TERM signal, it queries the kernel for shutdown information. When it receives it, it writes the message and exits. The message looks like this: type=DAEMON msg=auditd(1114551182.000) auditd normal halt, sending pid=2650 uid=525, auditd pid=1685 Signed-off-by: Steve Grubb <sgrubb@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 19:38:39 +08:00
int audit_pid;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* If audit_limit is non-zero, limit the rate of sending audit records
* to that number per second. This prevents DoS attacks, but results in
* audit records being dropped. */
static int audit_rate_limit;
/* Number of outstanding audit_buffers allowed. */
static int audit_backlog_limit = 64;
static atomic_t audit_backlog = ATOMIC_INIT(0);
The attached patch addresses the problem with getting the audit daemon shutdown credential information. It creates a new message type AUDIT_TERM_INFO, which is used by the audit daemon to query who issued the shutdown. It requires the placement of a hook function that gathers the information. The hook is after the DAC & MAC checks and before the function returns. Racing threads could overwrite the uid & pid - but they would have to be root and have policy that allows signalling the audit daemon. That should be a manageable risk. The userspace component will be released later in audit 0.7.2. When it receives the TERM signal, it queries the kernel for shutdown information. When it receives it, it writes the message and exits. The message looks like this: type=DAEMON msg=auditd(1114551182.000) auditd normal halt, sending pid=2650 uid=525, auditd pid=1685 Signed-off-by: Steve Grubb <sgrubb@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 19:38:39 +08:00
/* The identity of the user shutting down the audit system. */
uid_t audit_sig_uid = -1;
pid_t audit_sig_pid = -1;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* Records can be lost in several ways:
0) [suppressed in audit_alloc]
1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
2) out of memory in audit_log_move [alloc_skb]
3) suppressed due to audit_rate_limit
4) suppressed due to audit_backlog_limit
*/
static atomic_t audit_lost = ATOMIC_INIT(0);
/* The netlink socket. */
static struct sock *audit_sock;
/* There are two lists of audit buffers. The txlist contains audit
* buffers that cannot be sent immediately to the netlink device because
* we are in an irq context (these are sent later in a tasklet).
*
* The second list is a list of pre-allocated audit buffers (if more
* than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
* being placed on the freelist). */
static DEFINE_SPINLOCK(audit_txlist_lock);
static DEFINE_SPINLOCK(audit_freelist_lock);
static int audit_freelist_count = 0;
static LIST_HEAD(audit_txlist);
static LIST_HEAD(audit_freelist);
/* There are three lists of rules -- one to search at task creation
* time, one to search at syscall entry time, and another to search at
* syscall exit time. */
static LIST_HEAD(audit_tsklist);
static LIST_HEAD(audit_entlist);
static LIST_HEAD(audit_extlist);
/* The netlink socket is only to be read by 1 CPU, which lets us assume
* that list additions and deletions never happen simultaneiously in
* auditsc.c */
static DECLARE_MUTEX(audit_netlink_sem);
/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
* audit records. Since printk uses a 1024 byte buffer, this buffer
* should be at least that large. */
#define AUDIT_BUFSIZ 1024
/* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
* audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
#define AUDIT_MAXFREE (2*NR_CPUS)
/* The audit_buffer is used when formatting an audit record. The caller
* locks briefly to get the record off the freelist or to allocate the
* buffer, and locks briefly to send the buffer to the netlink layer or
* to place it on a transmit queue. Multiple audit_buffers can be in
* use simultaneously. */
struct audit_buffer {
struct list_head list;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
struct sk_buff *skb; /* formatted skb ready to send */
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
struct audit_context *ctx; /* NULL or associated context */
int len; /* used area of tmp */
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
int size; /* size of tmp */
char *tmp;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
int type;
int pid;
};
void audit_set_type(struct audit_buffer *ab, int type)
{
ab->type = type;
}
struct audit_entry {
struct list_head list;
struct audit_rule rule;
};
static void audit_log_end_irq(struct audit_buffer *ab);
static void audit_log_end_fast(struct audit_buffer *ab);
static void audit_panic(const char *message)
{
switch (audit_failure)
{
case AUDIT_FAIL_SILENT:
break;
case AUDIT_FAIL_PRINTK:
printk(KERN_ERR "audit: %s\n", message);
break;
case AUDIT_FAIL_PANIC:
panic("audit: %s\n", message);
break;
}
}
static inline int audit_rate_check(void)
{
static unsigned long last_check = 0;
static int messages = 0;
static DEFINE_SPINLOCK(lock);
unsigned long flags;
unsigned long now;
unsigned long elapsed;
int retval = 0;
if (!audit_rate_limit) return 1;
spin_lock_irqsave(&lock, flags);
if (++messages < audit_rate_limit) {
retval = 1;
} else {
now = jiffies;
elapsed = now - last_check;
if (elapsed > HZ) {
last_check = now;
messages = 0;
retval = 1;
}
}
spin_unlock_irqrestore(&lock, flags);
return retval;
}
/* Emit at least 1 message per second, even if audit_rate_check is
* throttling. */
void audit_log_lost(const char *message)
{
static unsigned long last_msg = 0;
static DEFINE_SPINLOCK(lock);
unsigned long flags;
unsigned long now;
int print;
atomic_inc(&audit_lost);
print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
if (!print) {
spin_lock_irqsave(&lock, flags);
now = jiffies;
if (now - last_msg > HZ) {
print = 1;
last_msg = now;
}
spin_unlock_irqrestore(&lock, flags);
}
if (print) {
printk(KERN_WARNING
"audit: audit_lost=%d audit_backlog=%d"
" audit_rate_limit=%d audit_backlog_limit=%d\n",
atomic_read(&audit_lost),
atomic_read(&audit_backlog),
audit_rate_limit,
audit_backlog_limit);
audit_panic(message);
}
}
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
static int audit_set_rate_limit(int limit, uid_t loginuid)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
int old = audit_rate_limit;
audit_rate_limit = limit;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_log(NULL, "audit_rate_limit=%d old=%d by auid %u",
audit_rate_limit, old, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return old;
}
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
static int audit_set_backlog_limit(int limit, uid_t loginuid)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
int old = audit_backlog_limit;
audit_backlog_limit = limit;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_log(NULL, "audit_backlog_limit=%d old=%d by auid %u",
audit_backlog_limit, old, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return old;
}
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
static int audit_set_enabled(int state, uid_t loginuid)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
int old = audit_enabled;
if (state != 0 && state != 1)
return -EINVAL;
audit_enabled = state;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_log(NULL, "audit_enabled=%d old=%d by auid %u",
audit_enabled, old, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return old;
}
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
static int audit_set_failure(int state, uid_t loginuid)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
int old = audit_failure;
if (state != AUDIT_FAIL_SILENT
&& state != AUDIT_FAIL_PRINTK
&& state != AUDIT_FAIL_PANIC)
return -EINVAL;
audit_failure = state;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_log(NULL, "audit_failure=%d old=%d by auid %u",
audit_failure, old, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return old;
}
#ifdef CONFIG_NET
void audit_send_reply(int pid, int seq, int type, int done, int multi,
void *payload, int size)
{
struct sk_buff *skb;
struct nlmsghdr *nlh;
int len = NLMSG_SPACE(size);
void *data;
int flags = multi ? NLM_F_MULTI : 0;
int t = done ? NLMSG_DONE : type;
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
goto nlmsg_failure;
nlh = NLMSG_PUT(skb, pid, seq, t, len - sizeof(*nlh));
nlh->nlmsg_flags = flags;
data = NLMSG_DATA(nlh);
memcpy(data, payload, size);
netlink_unicast(audit_sock, skb, pid, MSG_DONTWAIT);
return;
nlmsg_failure: /* Used by NLMSG_PUT */
if (skb)
kfree_skb(skb);
}
/*
* Check for appropriate CAP_AUDIT_ capabilities on incoming audit
* control messages.
*/
static int audit_netlink_ok(kernel_cap_t eff_cap, u16 msg_type)
{
int err = 0;
switch (msg_type) {
case AUDIT_GET:
case AUDIT_LIST:
case AUDIT_SET:
case AUDIT_ADD:
case AUDIT_DEL:
The attached patch addresses the problem with getting the audit daemon shutdown credential information. It creates a new message type AUDIT_TERM_INFO, which is used by the audit daemon to query who issued the shutdown. It requires the placement of a hook function that gathers the information. The hook is after the DAC & MAC checks and before the function returns. Racing threads could overwrite the uid & pid - but they would have to be root and have policy that allows signalling the audit daemon. That should be a manageable risk. The userspace component will be released later in audit 0.7.2. When it receives the TERM signal, it queries the kernel for shutdown information. When it receives it, it writes the message and exits. The message looks like this: type=DAEMON msg=auditd(1114551182.000) auditd normal halt, sending pid=2650 uid=525, auditd pid=1685 Signed-off-by: Steve Grubb <sgrubb@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 19:38:39 +08:00
case AUDIT_SIGNAL_INFO:
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (!cap_raised(eff_cap, CAP_AUDIT_CONTROL))
err = -EPERM;
break;
case AUDIT_USER:
if (!cap_raised(eff_cap, CAP_AUDIT_WRITE))
err = -EPERM;
break;
default: /* bad msg */
err = -EINVAL;
}
return err;
}
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
u32 uid, pid, seq;
void *data;
struct audit_status *status_get, status_set;
int err;
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
uid_t loginuid; /* loginuid of sender */
The attached patch addresses the problem with getting the audit daemon shutdown credential information. It creates a new message type AUDIT_TERM_INFO, which is used by the audit daemon to query who issued the shutdown. It requires the placement of a hook function that gathers the information. The hook is after the DAC & MAC checks and before the function returns. Racing threads could overwrite the uid & pid - but they would have to be root and have policy that allows signalling the audit daemon. That should be a manageable risk. The userspace component will be released later in audit 0.7.2. When it receives the TERM signal, it queries the kernel for shutdown information. When it receives it, it writes the message and exits. The message looks like this: type=DAEMON msg=auditd(1114551182.000) auditd normal halt, sending pid=2650 uid=525, auditd pid=1685 Signed-off-by: Steve Grubb <sgrubb@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 19:38:39 +08:00
struct audit_sig_info sig_data;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
err = audit_netlink_ok(NETLINK_CB(skb).eff_cap, msg_type);
if (err)
return err;
pid = NETLINK_CREDS(skb)->pid;
uid = NETLINK_CREDS(skb)->uid;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
loginuid = NETLINK_CB(skb).loginuid;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
seq = nlh->nlmsg_seq;
data = NLMSG_DATA(nlh);
switch (msg_type) {
case AUDIT_GET:
status_set.enabled = audit_enabled;
status_set.failure = audit_failure;
status_set.pid = audit_pid;
status_set.rate_limit = audit_rate_limit;
status_set.backlog_limit = audit_backlog_limit;
status_set.lost = atomic_read(&audit_lost);
status_set.backlog = atomic_read(&audit_backlog);
audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0,
&status_set, sizeof(status_set));
break;
case AUDIT_SET:
if (nlh->nlmsg_len < sizeof(struct audit_status))
return -EINVAL;
status_get = (struct audit_status *)data;
if (status_get->mask & AUDIT_STATUS_ENABLED) {
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
err = audit_set_enabled(status_get->enabled, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (err < 0) return err;
}
if (status_get->mask & AUDIT_STATUS_FAILURE) {
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
err = audit_set_failure(status_get->failure, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (err < 0) return err;
}
if (status_get->mask & AUDIT_STATUS_PID) {
int old = audit_pid;
audit_pid = status_get->pid;
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_log(NULL, "audit_pid=%d old=%d by auid %u",
audit_pid, old, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_set_rate_limit(status_get->rate_limit, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
audit_set_backlog_limit(status_get->backlog_limit,
loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
break;
case AUDIT_USER:
ab = audit_log_start(NULL);
if (!ab)
break; /* audit_panic has been called */
audit_log_format(ab,
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
"user pid=%d uid=%d length=%d loginuid=%u"
" msg='%.1024s'",
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
pid, uid,
(int)(nlh->nlmsg_len
- ((char *)data - (char *)nlh)),
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
loginuid, (char *)data);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
ab->type = AUDIT_USER;
ab->pid = pid;
audit_log_end(ab);
break;
case AUDIT_ADD:
case AUDIT_DEL:
if (nlh->nlmsg_len < sizeof(struct audit_rule))
return -EINVAL;
/* fallthrough */
case AUDIT_LIST:
#ifdef CONFIG_AUDITSYSCALL
err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid,
Add audit uid to netlink credentials Most audit control messages are sent over netlink.In order to properly log the identity of the sender of audit control messages, we would like to add the loginuid to the netlink_creds structure, as per the attached patch. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:27:17 +08:00
uid, seq, data, loginuid);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#else
err = -EOPNOTSUPP;
#endif
break;
The attached patch addresses the problem with getting the audit daemon shutdown credential information. It creates a new message type AUDIT_TERM_INFO, which is used by the audit daemon to query who issued the shutdown. It requires the placement of a hook function that gathers the information. The hook is after the DAC & MAC checks and before the function returns. Racing threads could overwrite the uid & pid - but they would have to be root and have policy that allows signalling the audit daemon. That should be a manageable risk. The userspace component will be released later in audit 0.7.2. When it receives the TERM signal, it queries the kernel for shutdown information. When it receives it, it writes the message and exits. The message looks like this: type=DAEMON msg=auditd(1114551182.000) auditd normal halt, sending pid=2650 uid=525, auditd pid=1685 Signed-off-by: Steve Grubb <sgrubb@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 19:38:39 +08:00
case AUDIT_SIGNAL_INFO:
sig_data.uid = audit_sig_uid;
sig_data.pid = audit_sig_pid;
audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
0, 0, &sig_data, sizeof(sig_data));
break;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
default:
err = -EINVAL;
break;
}
return err < 0 ? err : 0;
}
/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
* processed by audit_receive_msg. Malformed skbs with wrong length are
* discarded silently. */
[NETLINK]: Synchronous message processing. Let's recap the problem. The current asynchronous netlink kernel message processing is vulnerable to these attacks: 1) Hit and run: Attacker sends one or more messages and then exits before they're processed. This may confuse/disable the next netlink user that gets the netlink address of the attacker since it may receive the responses to the attacker's messages. Proposed solutions: a) Synchronous processing. b) Stream mode socket. c) Restrict/prohibit binding. 2) Starvation: Because various netlink rcv functions were written to not return until all messages have been processed on a socket, it is possible for these functions to execute for an arbitrarily long period of time. If this is successfully exploited it could also be used to hold rtnl forever. Proposed solutions: a) Synchronous processing. b) Stream mode socket. Firstly let's cross off solution c). It only solves the first problem and it has user-visible impacts. In particular, it'll break user space applications that expect to bind or communicate with specific netlink addresses (pid's). So we're left with a choice of synchronous processing versus SOCK_STREAM for netlink. For the moment I'm sticking with the synchronous approach as suggested by Alexey since it's simpler and I'd rather spend my time working on other things. However, it does have a number of deficiencies compared to the stream mode solution: 1) User-space to user-space netlink communication is still vulnerable. 2) Inefficient use of resources. This is especially true for rtnetlink since the lock is shared with other users such as networking drivers. The latter could hold the rtnl while communicating with hardware which causes the rtnetlink user to wait when it could be doing other things. 3) It is still possible to DoS all netlink users by flooding the kernel netlink receive queue. The attacker simply fills the receive socket with a single netlink message that fills up the entire queue. The attacker then continues to call sendmsg with the same message in a loop. Point 3) can be countered by retransmissions in user-space code, however it is pretty messy. In light of these problems (in particular, point 3), we should implement stream mode netlink at some point. In the mean time, here is a patch that implements synchronous processing. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-04 05:55:09 +08:00
static void audit_receive_skb(struct sk_buff *skb)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
int err;
struct nlmsghdr *nlh;
u32 rlen;
while (skb->len >= NLMSG_SPACE(0)) {
nlh = (struct nlmsghdr *)skb->data;
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
[NETLINK]: Synchronous message processing. Let's recap the problem. The current asynchronous netlink kernel message processing is vulnerable to these attacks: 1) Hit and run: Attacker sends one or more messages and then exits before they're processed. This may confuse/disable the next netlink user that gets the netlink address of the attacker since it may receive the responses to the attacker's messages. Proposed solutions: a) Synchronous processing. b) Stream mode socket. c) Restrict/prohibit binding. 2) Starvation: Because various netlink rcv functions were written to not return until all messages have been processed on a socket, it is possible for these functions to execute for an arbitrarily long period of time. If this is successfully exploited it could also be used to hold rtnl forever. Proposed solutions: a) Synchronous processing. b) Stream mode socket. Firstly let's cross off solution c). It only solves the first problem and it has user-visible impacts. In particular, it'll break user space applications that expect to bind or communicate with specific netlink addresses (pid's). So we're left with a choice of synchronous processing versus SOCK_STREAM for netlink. For the moment I'm sticking with the synchronous approach as suggested by Alexey since it's simpler and I'd rather spend my time working on other things. However, it does have a number of deficiencies compared to the stream mode solution: 1) User-space to user-space netlink communication is still vulnerable. 2) Inefficient use of resources. This is especially true for rtnetlink since the lock is shared with other users such as networking drivers. The latter could hold the rtnl while communicating with hardware which causes the rtnetlink user to wait when it could be doing other things. 3) It is still possible to DoS all netlink users by flooding the kernel netlink receive queue. The attacker simply fills the receive socket with a single netlink message that fills up the entire queue. The attacker then continues to call sendmsg with the same message in a loop. Point 3) can be countered by retransmissions in user-space code, however it is pretty messy. In light of these problems (in particular, point 3), we should implement stream mode netlink at some point. In the mean time, here is a patch that implements synchronous processing. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-04 05:55:09 +08:00
return;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
if ((err = audit_receive_msg(skb, nlh))) {
netlink_ack(skb, nlh, err);
} else if (nlh->nlmsg_flags & NLM_F_ACK)
netlink_ack(skb, nlh, 0);
skb_pull(skb, rlen);
}
}
/* Receive messages from netlink socket. */
static void audit_receive(struct sock *sk, int length)
{
struct sk_buff *skb;
[NETLINK]: Synchronous message processing. Let's recap the problem. The current asynchronous netlink kernel message processing is vulnerable to these attacks: 1) Hit and run: Attacker sends one or more messages and then exits before they're processed. This may confuse/disable the next netlink user that gets the netlink address of the attacker since it may receive the responses to the attacker's messages. Proposed solutions: a) Synchronous processing. b) Stream mode socket. c) Restrict/prohibit binding. 2) Starvation: Because various netlink rcv functions were written to not return until all messages have been processed on a socket, it is possible for these functions to execute for an arbitrarily long period of time. If this is successfully exploited it could also be used to hold rtnl forever. Proposed solutions: a) Synchronous processing. b) Stream mode socket. Firstly let's cross off solution c). It only solves the first problem and it has user-visible impacts. In particular, it'll break user space applications that expect to bind or communicate with specific netlink addresses (pid's). So we're left with a choice of synchronous processing versus SOCK_STREAM for netlink. For the moment I'm sticking with the synchronous approach as suggested by Alexey since it's simpler and I'd rather spend my time working on other things. However, it does have a number of deficiencies compared to the stream mode solution: 1) User-space to user-space netlink communication is still vulnerable. 2) Inefficient use of resources. This is especially true for rtnetlink since the lock is shared with other users such as networking drivers. The latter could hold the rtnl while communicating with hardware which causes the rtnetlink user to wait when it could be doing other things. 3) It is still possible to DoS all netlink users by flooding the kernel netlink receive queue. The attacker simply fills the receive socket with a single netlink message that fills up the entire queue. The attacker then continues to call sendmsg with the same message in a loop. Point 3) can be countered by retransmissions in user-space code, however it is pretty messy. In light of these problems (in particular, point 3), we should implement stream mode netlink at some point. In the mean time, here is a patch that implements synchronous processing. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-04 05:55:09 +08:00
unsigned int qlen;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
[NETLINK]: Synchronous message processing. Let's recap the problem. The current asynchronous netlink kernel message processing is vulnerable to these attacks: 1) Hit and run: Attacker sends one or more messages and then exits before they're processed. This may confuse/disable the next netlink user that gets the netlink address of the attacker since it may receive the responses to the attacker's messages. Proposed solutions: a) Synchronous processing. b) Stream mode socket. c) Restrict/prohibit binding. 2) Starvation: Because various netlink rcv functions were written to not return until all messages have been processed on a socket, it is possible for these functions to execute for an arbitrarily long period of time. If this is successfully exploited it could also be used to hold rtnl forever. Proposed solutions: a) Synchronous processing. b) Stream mode socket. Firstly let's cross off solution c). It only solves the first problem and it has user-visible impacts. In particular, it'll break user space applications that expect to bind or communicate with specific netlink addresses (pid's). So we're left with a choice of synchronous processing versus SOCK_STREAM for netlink. For the moment I'm sticking with the synchronous approach as suggested by Alexey since it's simpler and I'd rather spend my time working on other things. However, it does have a number of deficiencies compared to the stream mode solution: 1) User-space to user-space netlink communication is still vulnerable. 2) Inefficient use of resources. This is especially true for rtnetlink since the lock is shared with other users such as networking drivers. The latter could hold the rtnl while communicating with hardware which causes the rtnetlink user to wait when it could be doing other things. 3) It is still possible to DoS all netlink users by flooding the kernel netlink receive queue. The attacker simply fills the receive socket with a single netlink message that fills up the entire queue. The attacker then continues to call sendmsg with the same message in a loop. Point 3) can be countered by retransmissions in user-space code, however it is pretty messy. In light of these problems (in particular, point 3), we should implement stream mode netlink at some point. In the mean time, here is a patch that implements synchronous processing. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-04 05:55:09 +08:00
down(&audit_netlink_sem);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
[NETLINK]: Synchronous message processing. Let's recap the problem. The current asynchronous netlink kernel message processing is vulnerable to these attacks: 1) Hit and run: Attacker sends one or more messages and then exits before they're processed. This may confuse/disable the next netlink user that gets the netlink address of the attacker since it may receive the responses to the attacker's messages. Proposed solutions: a) Synchronous processing. b) Stream mode socket. c) Restrict/prohibit binding. 2) Starvation: Because various netlink rcv functions were written to not return until all messages have been processed on a socket, it is possible for these functions to execute for an arbitrarily long period of time. If this is successfully exploited it could also be used to hold rtnl forever. Proposed solutions: a) Synchronous processing. b) Stream mode socket. Firstly let's cross off solution c). It only solves the first problem and it has user-visible impacts. In particular, it'll break user space applications that expect to bind or communicate with specific netlink addresses (pid's). So we're left with a choice of synchronous processing versus SOCK_STREAM for netlink. For the moment I'm sticking with the synchronous approach as suggested by Alexey since it's simpler and I'd rather spend my time working on other things. However, it does have a number of deficiencies compared to the stream mode solution: 1) User-space to user-space netlink communication is still vulnerable. 2) Inefficient use of resources. This is especially true for rtnetlink since the lock is shared with other users such as networking drivers. The latter could hold the rtnl while communicating with hardware which causes the rtnetlink user to wait when it could be doing other things. 3) It is still possible to DoS all netlink users by flooding the kernel netlink receive queue. The attacker simply fills the receive socket with a single netlink message that fills up the entire queue. The attacker then continues to call sendmsg with the same message in a loop. Point 3) can be countered by retransmissions in user-space code, however it is pretty messy. In light of these problems (in particular, point 3), we should implement stream mode netlink at some point. In the mean time, here is a patch that implements synchronous processing. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-04 05:55:09 +08:00
for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) {
skb = skb_dequeue(&sk->sk_receive_queue);
audit_receive_skb(skb);
kfree_skb(skb);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
up(&audit_netlink_sem);
}
/* Move data from tmp buffer into an skb. This is an extra copy, and
* that is unfortunate. However, the copy will only occur when a record
* is being written to user space, which is already a high-overhead
* operation. (Elimination of the copy is possible, for example, by
* writing directly into a pre-allocated skb, at the cost of wasting
* memory. */
static void audit_log_move(struct audit_buffer *ab)
{
struct sk_buff *skb;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
struct nlmsghdr *nlh;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
char *start;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
int len = NLMSG_SPACE(0) + ab->len + 1;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* possible resubmission */
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
if (ab->skb)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
skb = alloc_skb(len, GFP_ATOMIC);
if (!skb) {
/* Lose information in ab->tmp */
audit_log_lost("out of memory in audit_log_move");
return;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
ab->skb = skb;
nlh = (struct nlmsghdr *)skb_put(skb, NLMSG_SPACE(0));
nlh->nlmsg_type = ab->type;
nlh->nlmsg_len = ab->len;
nlh->nlmsg_flags = 0;
nlh->nlmsg_pid = ab->pid;
nlh->nlmsg_seq = 0;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
start = skb_put(skb, ab->len);
memcpy(start, ab->tmp, ab->len);
}
/* Iterate over the skbuff in the audit_buffer, sending their contents
* to user space. */
static inline int audit_log_drain(struct audit_buffer *ab)
{
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
struct sk_buff *skb = ab->skb;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
if (skb) {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
int retval = 0;
if (audit_pid) {
skb_get(skb); /* because netlink_* frees */
retval = netlink_unicast(audit_sock, skb, audit_pid,
MSG_DONTWAIT);
}
[AUDIT] Requeue messages at head of queue, up to audit_backlog If netlink_unicast() fails, requeue the skb back at the head of the queue it just came from, instead of the tail. And do so unless we've exceeded the audit_backlog limit; not according to some other arbitrary limit. From: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-30 00:19:14 +08:00
if (retval == -EAGAIN &&
(atomic_read(&audit_backlog)) < audit_backlog_limit) {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
audit_log_end_irq(ab);
return 1;
}
if (retval < 0) {
if (retval == -ECONNREFUSED) {
printk(KERN_ERR
"audit: *NO* daemon at audit_pid=%d\n",
audit_pid);
audit_pid = 0;
} else
audit_log_lost("netlink socket too busy");
}
if (!audit_pid) { /* No daemon */
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
int offset = NLMSG_SPACE(0);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
int len = skb->len - offset;
[AUDIT] Avoid using %*.*s format strings. They don't seem to work correctly (investigation ongoing), but we don't actually need to do it anyway. Patch from Peter Martuccelli <peterm@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:10:24 +08:00
skb->data[offset + len] = '\0';
printk(KERN_ERR "%s\n", skb->data + offset);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
kfree_skb(skb);
}
return 0;
}
/* Initialize audit support at boot time. */
static int __init audit_init(void)
{
printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
audit_default ? "enabled" : "disabled");
audit_sock = netlink_kernel_create(NETLINK_AUDIT, audit_receive);
if (!audit_sock)
audit_panic("cannot initialize netlink socket");
audit_initialized = 1;
audit_enabled = audit_default;
audit_log(NULL, "initialized");
return 0;
}
#else
/* Without CONFIG_NET, we have no skbuffs. For now, print what we have
* in the buffer. */
static void audit_log_move(struct audit_buffer *ab)
{
printk(KERN_ERR "%*.*s\n", ab->len, ab->len, ab->tmp);
ab->len = 0;
}
static inline int audit_log_drain(struct audit_buffer *ab)
{
return 0;
}
/* Initialize audit support at boot time. */
int __init audit_init(void)
{
printk(KERN_INFO "audit: initializing WITHOUT netlink support\n");
audit_sock = NULL;
audit_pid = 0;
audit_initialized = 1;
audit_enabled = audit_default;
audit_log(NULL, "initialized");
return 0;
}
#endif
__initcall(audit_init);
/* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
static int __init audit_enable(char *str)
{
audit_default = !!simple_strtol(str, NULL, 0);
printk(KERN_INFO "audit: %s%s\n",
audit_default ? "enabled" : "disabled",
audit_initialized ? "" : " (after initialization)");
if (audit_initialized)
audit_enabled = audit_default;
return 0;
}
__setup("audit=", audit_enable);
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
static void audit_buffer_free(struct audit_buffer *ab)
{
unsigned long flags;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
if (!ab)
return;
kfree(ab->tmp);
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
atomic_dec(&audit_backlog);
spin_lock_irqsave(&audit_freelist_lock, flags);
if (++audit_freelist_count > AUDIT_MAXFREE)
kfree(ab);
else
list_add(&ab->list, &audit_freelist);
spin_unlock_irqrestore(&audit_freelist_lock, flags);
}
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
int gfp_mask)
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
{
unsigned long flags;
struct audit_buffer *ab = NULL;
spin_lock_irqsave(&audit_freelist_lock, flags);
if (!list_empty(&audit_freelist)) {
ab = list_entry(audit_freelist.next,
struct audit_buffer, list);
list_del(&ab->list);
--audit_freelist_count;
}
spin_unlock_irqrestore(&audit_freelist_lock, flags);
if (!ab) {
ab = kmalloc(sizeof(*ab), GFP_ATOMIC);
if (!ab)
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
goto err;
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
}
atomic_inc(&audit_backlog);
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
ab->tmp = kmalloc(AUDIT_BUFSIZ, GFP_ATOMIC);
if (!ab->tmp)
goto err;
ab->skb = NULL;
ab->ctx = ctx;
ab->len = 0;
ab->size = AUDIT_BUFSIZ;
ab->type = AUDIT_KERNEL;
ab->pid = 0;
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
return ab;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
err:
audit_buffer_free(ab);
return NULL;
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* Obtain an audit buffer. This routine does locking to obtain the
* audit buffer, but then no locking is required for calls to
* audit_log_*format. If the tsk is a task that is currently in a
* syscall, then the syscall is marked as auditable and an audit record
* will be written at syscall exit. If there is no associated task, tsk
* should be NULL. */
struct audit_buffer *audit_log_start(struct audit_context *ctx)
{
struct audit_buffer *ab = NULL;
struct timespec t;
[AUDIT] Fix signedness of 'serial' in various routines. Attached is a patch that corrects a signed/unsigned warning. I also noticed that we needlessly init serial to 0. That only needs to occur if the kernel was compiled without the audit system. -Steve Grubb Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:09:52 +08:00
unsigned int serial;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (!audit_initialized)
return NULL;
if (audit_backlog_limit
&& atomic_read(&audit_backlog) > audit_backlog_limit) {
if (audit_rate_check())
printk(KERN_WARNING
"audit: audit_backlog=%d > "
"audit_backlog_limit=%d\n",
atomic_read(&audit_backlog),
audit_backlog_limit);
audit_log_lost("backlog limit exceeded");
return NULL;
}
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
ab = audit_buffer_alloc(ctx, GFP_ATOMIC);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (!ab) {
audit_log_lost("out of memory in audit_log_start");
return NULL;
}
#ifdef CONFIG_AUDITSYSCALL
if (ab->ctx)
audit_get_stamp(ab->ctx, &t, &serial);
else
#endif
[AUDIT] Fix signedness of 'serial' in various routines. Attached is a patch that corrects a signed/unsigned warning. I also noticed that we needlessly init serial to 0. That only needs to occur if the kernel was compiled without the audit system. -Steve Grubb Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:09:52 +08:00
{
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
t = CURRENT_TIME;
[AUDIT] Fix signedness of 'serial' in various routines. Attached is a patch that corrects a signed/unsigned warning. I also noticed that we needlessly init serial to 0. That only needs to occur if the kernel was compiled without the audit system. -Steve Grubb Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 23:09:52 +08:00
serial = 0;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
audit_log_format(ab, "audit(%lu.%03lu:%u): ",
t.tv_sec, t.tv_nsec/1000000, serial);
return ab;
}
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
/**
* audit_expand - expand tmp buffer in the audit buffer
* @ab: audit_buffer
*
* Returns 0 (no space) on failed expansion, or available space if
* successful.
*/
static inline int audit_expand(struct audit_buffer *ab)
{
char *tmp;
int len = ab->size + AUDIT_BUFSIZ;
tmp = kmalloc(len, GFP_ATOMIC);
if (!tmp)
return 0;
memcpy(tmp, ab->tmp, ab->len);
kfree(ab->tmp);
ab->tmp = tmp;
ab->size = len;
return ab->size - ab->len;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* Format an audit message into the audit buffer. If there isn't enough
* room in the audit buffer, more room will be allocated and vsnprint
* will be called a second time. Currently, we assume that a printk
* can't format message larger than 1024 bytes, so we don't either. */
static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
va_list args)
{
int len, avail;
if (!ab)
return;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
avail = ab->size - ab->len;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (avail <= 0) {
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
avail = audit_expand(ab);
if (!avail)
goto out;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
len = vsnprintf(ab->tmp + ab->len, avail, fmt, args);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (len >= avail) {
/* The printk buffer is 1024 bytes long, so if we get
* here and AUDIT_BUFSIZ is at least 1024, then we can
* log everything that printk could have logged. */
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
avail = audit_expand(ab);
if (!avail)
goto out;
len = vsnprintf(ab->tmp + ab->len, avail, fmt, args);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
ab->len += (len < avail) ? len : avail;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
out:
return;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
/* Format a message into the audit buffer. All the work is done in
* audit_log_vformat. */
void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
{
va_list args;
if (!ab)
return;
va_start(args, fmt);
audit_log_vformat(ab, fmt, args);
va_end(args);
}
AUDIT: Avoid log pollution by untrusted strings. We log strings from userspace, such as arguments to open(). These could be formatted to contain \n followed by fake audit log entries. Provide a function for logging such strings, which gives a hex dump when the string contains anything but basic printable ASCII characters. Use it for logging filenames. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 22:54:44 +08:00
void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf, size_t len)
{
int i;
for (i=0; i<len; i++)
audit_log_format(ab, "%02x", buf[i]);
}
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
{
audit_log_untrustedstring() warning fix kernel/audit.c: In function `audit_log_untrustedstring': kernel/audit.c:736: warning: comparison is always false due to limited range of data type Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 22:59:11 +08:00
const unsigned char *p = string;
AUDIT: Avoid log pollution by untrusted strings. We log strings from userspace, such as arguments to open(). These could be formatted to contain \n followed by fake audit log entries. Provide a function for logging such strings, which gives a hex dump when the string contains anything but basic printable ASCII characters. Use it for logging filenames. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-04-29 22:54:44 +08:00
while (*p) {
if (*p == '"' || *p == ' ' || *p < 0x20 || *p > 0x7f) {
audit_log_hex(ab, string, strlen(string));
return;
}
p++;
}
audit_log_format(ab, "\"%s\"", string);
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* This is a helper-function to print the d_path without using a static
* buffer or allocating another buffer in addition to the one in
* audit_buffer. */
void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
struct dentry *dentry, struct vfsmount *vfsmnt)
{
char *p;
int len, avail;
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
if (prefix)
audit_log_format(ab, " %s", prefix);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
avail = ab->size - ab->len;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
p = d_path(dentry, vfsmnt, ab->tmp + ab->len, avail);
if (IS_ERR(p)) {
/* FIXME: can we save some information here? */
audit_log_format(ab, "<toolong>");
} else {
/* path isn't at start of buffer */
AUDIT: expand audit tmp buffer as needed Introduce audit_expand and make the audit_buffer use a dynamic buffer which can be resized. When audit buffer is moved to skb it will not be fragmented across skb's, so we can eliminate the sklist in the audit_buffer. During audit_log_move, we simply copy the full buffer into a single skb, and then audit_log_drain sends it on. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:54:17 +08:00
len = (ab->tmp + ab->size - 1) - p;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
memmove(ab->tmp + ab->len, p, len);
ab->len += len;
}
}
/* Remove queued messages from the audit_txlist and send them to userspace. */
static void audit_tasklet_handler(unsigned long arg)
{
LIST_HEAD(list);
struct audit_buffer *ab;
unsigned long flags;
spin_lock_irqsave(&audit_txlist_lock, flags);
list_splice_init(&audit_txlist, &list);
spin_unlock_irqrestore(&audit_txlist_lock, flags);
while (!list_empty(&list)) {
ab = list_entry(list.next, struct audit_buffer, list);
list_del(&ab->list);
audit_log_end_fast(ab);
}
}
static DECLARE_TASKLET(audit_tasklet, audit_tasklet_handler, 0);
/* The netlink_* functions cannot be called inside an irq context, so
* the audit buffer is places on a queue and a tasklet is scheduled to
* remove them from the queue outside the irq context. May be called in
* any context. */
static void audit_log_end_irq(struct audit_buffer *ab)
{
unsigned long flags;
if (!ab)
return;
spin_lock_irqsave(&audit_txlist_lock, flags);
list_add_tail(&ab->list, &audit_txlist);
spin_unlock_irqrestore(&audit_txlist_lock, flags);
tasklet_schedule(&audit_tasklet);
}
/* Send the message in the audit buffer directly to user space. May not
* be called in an irq context. */
static void audit_log_end_fast(struct audit_buffer *ab)
{
BUG_ON(in_irq());
if (!ab)
return;
if (!audit_rate_check()) {
audit_log_lost("rate limit exceeded");
} else {
audit_log_move(ab);
if (audit_log_drain(ab))
return;
}
AUDIT: Add helper functions to allocate and free audit_buffers. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2005-05-06 22:53:34 +08:00
audit_buffer_free(ab);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
/* Send or queue the message in the audit buffer, depending on the
* current context. (A convenience function that may be called in any
* context.) */
void audit_log_end(struct audit_buffer *ab)
{
if (in_irq())
audit_log_end_irq(ab);
else
audit_log_end_fast(ab);
}
/* Log an audit record. This is a convenience function that calls
* audit_log_start, audit_log_vformat, and audit_log_end. It may be
* called in any context. */
void audit_log(struct audit_context *ctx, const char *fmt, ...)
{
struct audit_buffer *ab;
va_list args;
ab = audit_log_start(ctx);
if (ab) {
va_start(args, fmt);
audit_log_vformat(ab, fmt, args);
va_end(args);
audit_log_end(ab);
}
}