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Merge branch 'next' into for-linus

This commit is contained in:
James Morris 2011-05-24 22:55:24 +10:00
parent d762f43831 12a5a2621b
commit 434d42cfd0
25 changed files with 205 additions and 64 deletions
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8
fs/binfmt_flat.c
View File

@ -820,6 +820,8 @@ static int load_flat_shared_library(int id, struct lib_info *libs)
int res;
char buf[16];
memset(&bprm, 0, sizeof(bprm));
/* Create the file name */
sprintf(buf, "/lib/lib%d.so", id);
@ -835,6 +837,12 @@ static int load_flat_shared_library(int id, struct lib_info *libs)
if (!bprm.cred)
goto out;
/* We don't really care about recalculating credentials at this point
* as we're past the point of no return and are dealing with shared
* libraries.
*/
bprm.cred_prepared = 1;
res = prepare_binprm(&bprm);
if (!IS_ERR_VALUE(res))

5
include/linux/capability.h
View File

@ -417,7 +417,6 @@ extern const kernel_cap_t __cap_init_eff_set;
# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }})
# define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }})
# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }})
# define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0 \
| CAP_TO_MASK(CAP_LINUX_IMMUTABLE), \
CAP_FS_MASK_B1 } })
@ -427,11 +426,7 @@ extern const kernel_cap_t __cap_init_eff_set;
#endif /* _KERNEL_CAPABILITY_U32S != 2 */
#define CAP_INIT_INH_SET CAP_EMPTY_SET
# define cap_clear(c) do { (c) = __cap_empty_set; } while (0)
# define cap_set_full(c) do { (c) = __cap_full_set; } while (0)
# define cap_set_init_eff(c) do { (c) = __cap_init_eff_set; } while (0)
#define cap_raise(c, flag) ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag))
#define cap_lower(c, flag) ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))

7
include/linux/init_task.h
View File

@ -83,13 +83,6 @@ extern struct group_info init_groups;
#define INIT_IDS
#endif
/*
* Because of the reduced scope of CAP_SETPCAP when filesystem
* capabilities are in effect, it is safe to allow CAP_SETPCAP to
* be available in the default configuration.
*/
# define CAP_INIT_BSET CAP_FULL_SET
#ifdef CONFIG_RCU_BOOST
#define INIT_TASK_RCU_BOOST() \
.rcu_boost_mutex = NULL,

13
include/linux/key.h
View File

@ -276,6 +276,19 @@ static inline key_serial_t key_serial(struct key *key)
return key ? key->serial : 0;
}
/**
* key_is_instantiated - Determine if a key has been positively instantiated
* @key: The key to check.
*
* Return true if the specified key has been positively instantiated, false
* otherwise.
*/
static inline bool key_is_instantiated(const struct key *key)
{
return test_bit(KEY_FLAG_INSTANTIATED, &key->flags) &&
!test_bit(KEY_FLAG_NEGATIVE, &key->flags);
}
#define rcu_dereference_key(KEY) \
(rcu_dereference_protected((KEY)->payload.rcudata, \
rwsem_is_locked(&((struct key *)(KEY))->sem)))

3
include/linux/kmod.h
View File

@ -24,6 +24,7 @@
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/workqueue.h>
#include <linux/sysctl.h>
#define KMOD_PATH_LEN 256
@ -109,6 +110,8 @@ call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
NULL, NULL, NULL);
}
extern struct ctl_table usermodehelper_table[];
extern void usermodehelper_init(void);
extern int usermodehelper_disable(void);

4
kernel/capability.c
View File

@ -22,12 +22,8 @@
*/
const kernel_cap_t __cap_empty_set = CAP_EMPTY_SET;
const kernel_cap_t __cap_full_set = CAP_FULL_SET;
const kernel_cap_t __cap_init_eff_set = CAP_INIT_EFF_SET;
EXPORT_SYMBOL(__cap_empty_set);
EXPORT_SYMBOL(__cap_full_set);
EXPORT_SYMBOL(__cap_init_eff_set);
int file_caps_enabled = 1;

6
kernel/cred.c
View File

@ -49,10 +49,10 @@ struct cred init_cred = {
.magic = CRED_MAGIC,
#endif
.securebits = SECUREBITS_DEFAULT,
.cap_inheritable = CAP_INIT_INH_SET,
.cap_inheritable = CAP_EMPTY_SET,
.cap_permitted = CAP_FULL_SET,
.cap_effective = CAP_INIT_EFF_SET,
.cap_bset = CAP_INIT_BSET,
.cap_effective = CAP_FULL_SET,
.cap_bset = CAP_FULL_SET,
.user = INIT_USER,
.user_ns = &init_user_ns,
.group_info = &init_groups,

100
kernel/kmod.c
View File

@ -25,6 +25,7 @@
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/cred.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/workqueue.h>
@ -43,6 +44,13 @@ extern int max_threads;
static struct workqueue_struct *khelper_wq;
#define CAP_BSET (void *)1
#define CAP_PI (void *)2
static kernel_cap_t usermodehelper_bset = CAP_FULL_SET;
static kernel_cap_t usermodehelper_inheritable = CAP_FULL_SET;
static DEFINE_SPINLOCK(umh_sysctl_lock);
#ifdef CONFIG_MODULES
/*
@ -132,6 +140,7 @@ EXPORT_SYMBOL(__request_module);
static int ____call_usermodehelper(void *data)
{
struct subprocess_info *sub_info = data;
struct cred *new;
int retval;
spin_lock_irq(&current->sighand->siglock);
@ -153,6 +162,19 @@ static int ____call_usermodehelper(void *data)
goto fail;
}
retval = -ENOMEM;
new = prepare_kernel_cred(current);
if (!new)
goto fail;
spin_lock(&umh_sysctl_lock);
new->cap_bset = cap_intersect(usermodehelper_bset, new->cap_bset);
new->cap_inheritable = cap_intersect(usermodehelper_inheritable,
new->cap_inheritable);
spin_unlock(&umh_sysctl_lock);
commit_creds(new);
retval = kernel_execve(sub_info->path,
(const char *const *)sub_info->argv,
(const char *const *)sub_info->envp);
@ -420,6 +442,84 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info,
}
EXPORT_SYMBOL(call_usermodehelper_exec);
static int proc_cap_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table t;
unsigned long cap_array[_KERNEL_CAPABILITY_U32S];
kernel_cap_t new_cap;
int err, i;
if (write && (!capable(CAP_SETPCAP) ||
!capable(CAP_SYS_MODULE)))
return -EPERM;
/*
* convert from the global kernel_cap_t to the ulong array to print to
* userspace if this is a read.
*/
spin_lock(&umh_sysctl_lock);
for (i = 0; i < _KERNEL_CAPABILITY_U32S; i++) {
if (table->data == CAP_BSET)
cap_array[i] = usermodehelper_bset.cap[i];
else if (table->data == CAP_PI)
cap_array[i] = usermodehelper_inheritable.cap[i];
else
BUG();
}
spin_unlock(&umh_sysctl_lock);
t = *table;
t.data = &cap_array;
/*
* actually read or write and array of ulongs from userspace. Remember
* these are least significant 32 bits first
*/
err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
if (err < 0)
return err;
/*
* convert from the sysctl array of ulongs to the kernel_cap_t
* internal representation
*/
for (i = 0; i < _KERNEL_CAPABILITY_U32S; i++)
new_cap.cap[i] = cap_array[i];
/*
* Drop everything not in the new_cap (but don't add things)
*/
spin_lock(&umh_sysctl_lock);
if (write) {
if (table->data == CAP_BSET)
usermodehelper_bset = cap_intersect(usermodehelper_bset, new_cap);
if (table->data == CAP_PI)
usermodehelper_inheritable = cap_intersect(usermodehelper_inheritable, new_cap);
}
spin_unlock(&umh_sysctl_lock);
return 0;
}
struct ctl_table usermodehelper_table[] = {
{
.procname = "bset",
.data = CAP_BSET,
.maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long),
.mode = 0600,
.proc_handler = proc_cap_handler,
},
{
.procname = "inheritable",
.data = CAP_PI,
.maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long),
.mode = 0600,
.proc_handler = proc_cap_handler,
},
{ }
};
void __init usermodehelper_init(void)
{
khelper_wq = create_singlethread_workqueue("khelper");

6
kernel/sysctl.c
View File

@ -56,6 +56,7 @@
#include <linux/kprobes.h>
#include <linux/pipe_fs_i.h>
#include <linux/oom.h>
#include <linux/kmod.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
@ -615,6 +616,11 @@ static struct ctl_table kern_table[] = {
.mode = 0555,
.child = random_table,
},
{
.procname = "usermodehelper",
.mode = 0555,
.child = usermodehelper_table,
},
{
.procname = "overflowuid",
.data = &overflowuid,

10
net/dns_resolver/dns_key.c
View File

@ -212,10 +212,12 @@ static void dns_resolver_describe(const struct key *key, struct seq_file *m)
int err = key->type_data.x[0];
seq_puts(m, key->description);
if (err)
seq_printf(m, ": %d", err);
else
seq_printf(m, ": %u", key->datalen);
if (key_is_instantiated(key)) {
if (err)
seq_printf(m, ": %d", err);
else
seq_printf(m, ": %u", key->datalen);
}
}
/*

1
security/Kconfig
View File

@ -167,6 +167,7 @@ config INTEL_TXT
config LSM_MMAP_MIN_ADDR
int "Low address space for LSM to protect from user allocation"
depends on SECURITY && SECURITY_SELINUX
default 32768 if ARM
default 65536
help
This is the portion of low virtual memory which should be protected

13
security/commoncap.c
View File

@ -529,15 +529,10 @@ int cap_bprm_set_creds(struct linux_binprm *bprm)
new->suid = new->fsuid = new->euid;
new->sgid = new->fsgid = new->egid;
/* For init, we want to retain the capabilities set in the initial
* task. Thus we skip the usual capability rules
*/
if (!is_global_init(current)) {
if (effective)
new->cap_effective = new->cap_permitted;
else
cap_clear(new->cap_effective);
}
if (effective)
new->cap_effective = new->cap_permitted;
else
cap_clear(new->cap_effective);
bprm->cap_effective = effective;
/*

4
security/keys/internal.h
View File

@ -109,11 +109,13 @@ extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
const struct cred *cred,
struct key_type *type,
const void *description,
key_match_func_t match);
key_match_func_t match,
bool no_state_check);
extern key_ref_t search_my_process_keyrings(struct key_type *type,
const void *description,
key_match_func_t match,
bool no_state_check,
const struct cred *cred);
extern key_ref_t search_process_keyrings(struct key_type *type,
const void *description,

6
security/keys/keyctl.c
View File

@ -206,8 +206,14 @@ SYSCALL_DEFINE4(request_key, const char __user *, _type,
goto error5;
}
/* wait for the key to finish being constructed */
ret = wait_for_key_construction(key, 1);
if (ret < 0)
goto error6;
ret = key->serial;
error6:
key_put(key);
error5:
key_type_put(ktype);

37
security/keys/keyring.c
View File

@ -176,13 +176,15 @@ static void keyring_describe(const struct key *keyring, struct seq_file *m)
else
seq_puts(m, "[anon]");
rcu_read_lock();
klist = rcu_dereference(keyring->payload.subscriptions);
if (klist)
seq_printf(m, ": %u/%u", klist->nkeys, klist->maxkeys);
else
seq_puts(m, ": empty");
rcu_read_unlock();
if (key_is_instantiated(keyring)) {
rcu_read_lock();
klist = rcu_dereference(keyring->payload.subscriptions);
if (klist)
seq_printf(m, ": %u/%u", klist->nkeys, klist->maxkeys);
else
seq_puts(m, ": empty");
rcu_read_unlock();
}
}
/*
@ -271,6 +273,7 @@ struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
* @type: The type of key to search for.
* @description: Parameter for @match.
* @match: Function to rule on whether or not a key is the one required.
* @no_state_check: Don't check if a matching key is bad
*
* Search the supplied keyring tree for a key that matches the criteria given.
* The root keyring and any linked keyrings must grant Search permission to the
@ -303,7 +306,8 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
const struct cred *cred,
struct key_type *type,
const void *description,
key_match_func_t match)
key_match_func_t match,
bool no_state_check)
{
struct {
struct keyring_list *keylist;
@ -345,6 +349,8 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
kflags = keyring->flags;
if (keyring->type == type && match(keyring, description)) {
key = keyring;
if (no_state_check)
goto found;
/* check it isn't negative and hasn't expired or been
* revoked */
@ -384,11 +390,13 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
continue;
/* skip revoked keys and expired keys */
if (kflags & (1 << KEY_FLAG_REVOKED))
continue;
if (!no_state_check) {
if (kflags & (1 << KEY_FLAG_REVOKED))
continue;
if (key->expiry && now.tv_sec >= key->expiry)
continue;
if (key->expiry && now.tv_sec >= key->expiry)
continue;
}
/* keys that don't match */
if (!match(key, description))
@ -399,6 +407,9 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
cred, KEY_SEARCH) < 0)
continue;
if (no_state_check)
goto found;
/* we set a different error code if we pass a negative key */
if (kflags & (1 << KEY_FLAG_NEGATIVE)) {
err = key->type_data.reject_error;
@ -478,7 +489,7 @@ key_ref_t keyring_search(key_ref_t keyring,
return ERR_PTR(-ENOKEY);
return keyring_search_aux(keyring, current->cred,
type, description, type->match);
type, description, type->match, false);
}
EXPORT_SYMBOL(keyring_search);

2
security/keys/proc.c
View File

@ -199,7 +199,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
if (key->perm & KEY_POS_VIEW) {
skey_ref = search_my_process_keyrings(key->type, key,
lookup_user_key_possessed,
cred);
true, cred);
if (!IS_ERR(skey_ref)) {
key_ref_put(skey_ref);
key_ref = make_key_ref(key, 1);

12
security/keys/process_keys.c
View File

@ -331,6 +331,7 @@ void key_fsgid_changed(struct task_struct *tsk)
key_ref_t search_my_process_keyrings(struct key_type *type,
const void *description,
key_match_func_t match,
bool no_state_check,
const struct cred *cred)
{
key_ref_t key_ref, ret, err;
@ -350,7 +351,7 @@ key_ref_t search_my_process_keyrings(struct key_type *type,
if (cred->thread_keyring) {
key_ref = keyring_search_aux(
make_key_ref(cred->thread_keyring, 1),
cred, type, description, match);
cred, type, description, match, no_state_check);
if (!IS_ERR(key_ref))
goto found;
@ -371,7 +372,7 @@ key_ref_t search_my_process_keyrings(struct key_type *type,
if (cred->tgcred->process_keyring) {
key_ref = keyring_search_aux(
make_key_ref(cred->tgcred->process_keyring, 1),
cred, type, description, match);
cred, type, description, match, no_state_check);
if (!IS_ERR(key_ref))
goto found;
@ -395,7 +396,7 @@ key_ref_t search_my_process_keyrings(struct key_type *type,
make_key_ref(rcu_dereference(
cred->tgcred->session_keyring),
1),
cred, type, description, match);
cred, type, description, match, no_state_check);
rcu_read_unlock();
if (!IS_ERR(key_ref))
@ -417,7 +418,7 @@ key_ref_t search_my_process_keyrings(struct key_type *type,
else if (cred->user->session_keyring) {
key_ref = keyring_search_aux(
make_key_ref(cred->user->session_keyring, 1),
cred, type, description, match);
cred, type, description, match, no_state_check);
if (!IS_ERR(key_ref))
goto found;
@ -459,7 +460,8 @@ key_ref_t search_process_keyrings(struct key_type *type,
might_sleep();
key_ref = search_my_process_keyrings(type, description, match, cred);
key_ref = search_my_process_keyrings(type, description, match,
false, cred);
if (!IS_ERR(key_ref))
goto found;
err = key_ref;

3
security/keys/request_key.c
View File

@ -530,8 +530,7 @@ struct key *request_key_and_link(struct key_type *type,
dest_keyring, flags);
/* search all the process keyrings for a key */
key_ref = search_process_keyrings(type, description, type->match,
cred);
key_ref = search_process_keyrings(type, description, type->match, cred);
if (!IS_ERR(key_ref)) {
key = key_ref_to_ptr(key_ref);

3
security/keys/request_key_auth.c
View File

@ -59,7 +59,8 @@ static void request_key_auth_describe(const struct key *key,
seq_puts(m, "key:");
seq_puts(m, key->description);
seq_printf(m, " pid:%d ci:%zu", rka->pid, rka->callout_len);
if (key_is_instantiated(key))
seq_printf(m, " pid:%d ci:%zu", rka->pid, rka->callout_len);
}
/*

4
security/keys/user_defined.c
View File

@ -157,8 +157,8 @@ EXPORT_SYMBOL_GPL(user_destroy);
void user_describe(const struct key *key, struct seq_file *m)
{
seq_puts(m, key->description);
seq_printf(m, ": %u", key->datalen);
if (key_is_instantiated(key))
seq_printf(m, ": %u", key->datalen);
}
EXPORT_SYMBOL_GPL(user_describe);

17
security/tomoyo/common.c
View File

@ -108,10 +108,9 @@ static bool tomoyo_flush(struct tomoyo_io_buffer *head)
head->read_user_buf += len;
w += len;
}
if (*w) {
head->r.w[0] = w;
head->r.w[0] = w;
if (*w)
return false;
}
/* Add '\0' for query. */
if (head->poll) {
if (!head->read_user_buf_avail ||
@ -459,8 +458,16 @@ static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
if (profile == &tomoyo_default_profile)
return -EINVAL;
if (!strcmp(data, "COMMENT")) {
const struct tomoyo_path_info *old_comment = profile->comment;
profile->comment = tomoyo_get_name(cp);
static DEFINE_SPINLOCK(lock);
const struct tomoyo_path_info *new_comment
= tomoyo_get_name(cp);
const struct tomoyo_path_info *old_comment;
if (!new_comment)
return -ENOMEM;
spin_lock(&lock);
old_comment = profile->comment;
profile->comment = new_comment;
spin_unlock(&lock);
tomoyo_put_name(old_comment);
return 0;
}

1
security/tomoyo/file.c
View File

@ -1011,7 +1011,6 @@ int tomoyo_path_perm(const u8 operation, struct path *path)
break;
case TOMOYO_TYPE_RMDIR:
case TOMOYO_TYPE_CHROOT:
case TOMOYO_TYPE_UMOUNT:
tomoyo_add_slash(&buf);
break;
}

1
security/tomoyo/memory.c
View File

@ -75,6 +75,7 @@ void *tomoyo_commit_ok(void *data, const unsigned int size)
memset(data, 0, size);
return ptr;
}
kfree(ptr);
return NULL;
}

1
security/tomoyo/mount.c
View File

@ -143,6 +143,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
goto out;
}
requested_dev_name = tomoyo_realpath_from_path(&path);
path_put(&path);
if (!requested_dev_name) {
error = -ENOENT;
goto out;

2
security/tomoyo/util.c
View File

@ -390,7 +390,7 @@ bool tomoyo_correct_domain(const unsigned char *domainname)
if (!cp)
break;
if (*domainname != '/' ||
!tomoyo_correct_word2(domainname, cp - domainname - 1))
!tomoyo_correct_word2(domainname, cp - domainname))
goto out;
domainname = cp + 1;
}