mirror of https://gitee.com/openkylin/linux.git
[NETFILTER]: Remove tasklist_lock abuse in ipt{,6}owner
Rip out cmd/sid/pid matching since its unfixable broken and stands in the way of locking changes to tasklist_lock. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
David S. Miller
parent
000efe1d86
commit
34b4a4a624
|
|
@ -20,106 +20,6 @@ MODULE_LICENSE("GPL");
|
|||
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
|
||||
MODULE_DESCRIPTION("iptables owner match");
|
||||
|
||||
static int
|
||||
match_comm(const struct sk_buff *skb, const char *comm)
|
||||
{
|
||||
struct task_struct *g, *p;
|
||||
struct files_struct *files;
|
||||
int i;
|
||||
|
||||
read_lock(&tasklist_lock);
|
||||
do_each_thread(g, p) {
|
||||
if(strncmp(p->comm, comm, sizeof(p->comm)))
|
||||
continue;
|
||||
|
||||
task_lock(p);
|
||||
files = p->files;
|
||||
if(files) {
|
||||
spin_lock(&files->file_lock);
|
||||
for (i=0; i < files->max_fds; i++) {
|
||||
if (fcheck_files(files, i) ==
|
||||
skb->sk->sk_socket->file) {
|
||||
spin_unlock(&files->file_lock);
|
||||
task_unlock(p);
|
||||
read_unlock(&tasklist_lock);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
spin_unlock(&files->file_lock);
|
||||
}
|
||||
task_unlock(p);
|
||||
} while_each_thread(g, p);
|
||||
read_unlock(&tasklist_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
match_pid(const struct sk_buff *skb, pid_t pid)
|
||||
{
|
||||
struct task_struct *p;
|
||||
struct files_struct *files;
|
||||
int i;
|
||||
|
||||
read_lock(&tasklist_lock);
|
||||
p = find_task_by_pid(pid);
|
||||
if (!p)
|
||||
goto out;
|
||||
task_lock(p);
|
||||
files = p->files;
|
||||
if(files) {
|
||||
spin_lock(&files->file_lock);
|
||||
for (i=0; i < files->max_fds; i++) {
|
||||
if (fcheck_files(files, i) ==
|
||||
skb->sk->sk_socket->file) {
|
||||
spin_unlock(&files->file_lock);
|
||||
task_unlock(p);
|
||||
read_unlock(&tasklist_lock);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
spin_unlock(&files->file_lock);
|
||||
}
|
||||
task_unlock(p);
|
||||
out:
|
||||
read_unlock(&tasklist_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
match_sid(const struct sk_buff *skb, pid_t sid)
|
||||
{
|
||||
struct task_struct *g, *p;
|
||||
struct file *file = skb->sk->sk_socket->file;
|
||||
int i, found=0;
|
||||
|
||||
read_lock(&tasklist_lock);
|
||||
do_each_thread(g, p) {
|
||||
struct files_struct *files;
|
||||
if (p->signal->session != sid)
|
||||
continue;
|
||||
|
||||
task_lock(p);
|
||||
files = p->files;
|
||||
if (files) {
|
||||
spin_lock(&files->file_lock);
|
||||
for (i=0; i < files->max_fds; i++) {
|
||||
if (fcheck_files(files, i) == file) {
|
||||
found = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
spin_unlock(&files->file_lock);
|
||||
}
|
||||
task_unlock(p);
|
||||
if (found)
|
||||
goto out;
|
||||
} while_each_thread(g, p);
|
||||
out:
|
||||
read_unlock(&tasklist_lock);
|
||||
|
||||
return found;
|
||||
}
|
||||
|
||||
static int
|
||||
match(const struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
|
|
@ -145,24 +45,6 @@ match(const struct sk_buff *skb,
|
|||
return 0;
|
||||
}
|
||||
|
||||
if(info->match & IPT_OWNER_PID) {
|
||||
if (!match_pid(skb, info->pid) ^
|
||||
!!(info->invert & IPT_OWNER_PID))
|
||||
return 0;
|
||||
}
|
||||
|
||||
if(info->match & IPT_OWNER_SID) {
|
||||
if (!match_sid(skb, info->sid) ^
|
||||
!!(info->invert & IPT_OWNER_SID))
|
||||
return 0;
|
||||
}
|
||||
|
||||
if(info->match & IPT_OWNER_COMM) {
|
||||
if (!match_comm(skb, info->comm) ^
|
||||
!!(info->invert & IPT_OWNER_COMM))
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
@ -173,6 +55,8 @@ checkentry(const char *tablename,
|
|||
unsigned int matchsize,
|
||||
unsigned int hook_mask)
|
||||
{
|
||||
const struct ipt_owner_info *info = matchinfo;
|
||||
|
||||
if (hook_mask
|
||||
& ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
|
||||
printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
|
||||
|
|
@ -184,15 +68,13 @@ checkentry(const char *tablename,
|
|||
IPT_ALIGN(sizeof(struct ipt_owner_info)));
|
||||
return 0;
|
||||
}
|
||||
#ifdef CONFIG_SMP
|
||||
/* files->file_lock can not be used in a BH */
|
||||
if (((struct ipt_owner_info *)matchinfo)->match
|
||||
& (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
|
||||
printk("ipt_owner: pid, sid and command matching is broken "
|
||||
"on SMP.\n");
|
||||
|
||||
if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
|
||||
printk("ipt_owner: pid, sid and command matching "
|
||||
"not supported anymore\n");
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -20,71 +20,6 @@ MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
|
|||
MODULE_DESCRIPTION("IP6 tables owner matching module");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
static int
|
||||
match_pid(const struct sk_buff *skb, pid_t pid)
|
||||
{
|
||||
struct task_struct *p;
|
||||
struct files_struct *files;
|
||||
int i;
|
||||
|
||||
read_lock(&tasklist_lock);
|
||||
p = find_task_by_pid(pid);
|
||||
if (!p)
|
||||
goto out;
|
||||
task_lock(p);
|
||||
files = p->files;
|
||||
if(files) {
|
||||
spin_lock(&files->file_lock);
|
||||
for (i=0; i < files->max_fds; i++) {
|
||||
if (fcheck_files(files, i) == skb->sk->sk_socket->file) {
|
||||
spin_unlock(&files->file_lock);
|
||||
task_unlock(p);
|
||||
read_unlock(&tasklist_lock);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
spin_unlock(&files->file_lock);
|
||||
}
|
||||
task_unlock(p);
|
||||
out:
|
||||
read_unlock(&tasklist_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
match_sid(const struct sk_buff *skb, pid_t sid)
|
||||
{
|
||||
struct task_struct *g, *p;
|
||||
struct file *file = skb->sk->sk_socket->file;
|
||||
int i, found=0;
|
||||
|
||||
read_lock(&tasklist_lock);
|
||||
do_each_thread(g, p) {
|
||||
struct files_struct *files;
|
||||
if (p->signal->session != sid)
|
||||
continue;
|
||||
|
||||
task_lock(p);
|
||||
files = p->files;
|
||||
if (files) {
|
||||
spin_lock(&files->file_lock);
|
||||
for (i=0; i < files->max_fds; i++) {
|
||||
if (fcheck_files(files, i) == file) {
|
||||
found = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
spin_unlock(&files->file_lock);
|
||||
}
|
||||
task_unlock(p);
|
||||
if (found)
|
||||
goto out;
|
||||
} while_each_thread(g, p);
|
||||
out:
|
||||
read_unlock(&tasklist_lock);
|
||||
|
||||
return found;
|
||||
}
|
||||
|
||||
static int
|
||||
match(const struct sk_buff *skb,
|
||||
|
|
@ -112,18 +47,6 @@ match(const struct sk_buff *skb,
|
|||
return 0;
|
||||
}
|
||||
|
||||
if(info->match & IP6T_OWNER_PID) {
|
||||
if (!match_pid(skb, info->pid) ^
|
||||
!!(info->invert & IP6T_OWNER_PID))
|
||||
return 0;
|
||||
}
|
||||
|
||||
if(info->match & IP6T_OWNER_SID) {
|
||||
if (!match_sid(skb, info->sid) ^
|
||||
!!(info->invert & IP6T_OWNER_SID))
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
@ -134,6 +57,8 @@ checkentry(const char *tablename,
|
|||
unsigned int matchsize,
|
||||
unsigned int hook_mask)
|
||||
{
|
||||
const struct ip6t_owner_info *info = matchinfo;
|
||||
|
||||
if (hook_mask
|
||||
& ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) {
|
||||
printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
|
||||
|
|
@ -142,14 +67,13 @@ checkentry(const char *tablename,
|
|||
|
||||
if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info)))
|
||||
return 0;
|
||||
#ifdef CONFIG_SMP
|
||||
/* files->file_lock can not be used in a BH */
|
||||
if (((struct ip6t_owner_info *)matchinfo)->match
|
||||
& (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
|
||||
printk("ip6t_owner: pid and sid matching is broken on SMP.\n");
|
||||
|
||||
if (info->match & (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
|
||||
printk("ipt_owner: pid and sid matching "
|
||||
"not supported anymore\n");
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue