Commit 34b4a4a6 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by David S. Miller
Browse files

[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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 000efe1d
......@@ -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;
}
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment