forked from Minki/linux
[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");
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MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
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MODULE_DESCRIPTION("iptables owner match");
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static int
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match_comm(const struct sk_buff *skb, const char *comm)
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{
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struct task_struct *g, *p;
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struct files_struct *files;
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int i;
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read_lock(&tasklist_lock);
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do_each_thread(g, p) {
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if(strncmp(p->comm, comm, sizeof(p->comm)))
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continue;
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task_lock(p);
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files = p->files;
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if(files) {
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spin_lock(&files->file_lock);
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for (i=0; i < files->max_fds; i++) {
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if (fcheck_files(files, i) ==
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skb->sk->sk_socket->file) {
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spin_unlock(&files->file_lock);
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task_unlock(p);
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read_unlock(&tasklist_lock);
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return 1;
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}
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}
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spin_unlock(&files->file_lock);
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}
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task_unlock(p);
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} while_each_thread(g, p);
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read_unlock(&tasklist_lock);
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return 0;
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}
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static int
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match_pid(const struct sk_buff *skb, pid_t pid)
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{
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struct task_struct *p;
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struct files_struct *files;
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int i;
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read_lock(&tasklist_lock);
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p = find_task_by_pid(pid);
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if (!p)
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goto out;
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task_lock(p);
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files = p->files;
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if(files) {
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spin_lock(&files->file_lock);
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for (i=0; i < files->max_fds; i++) {
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if (fcheck_files(files, i) ==
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skb->sk->sk_socket->file) {
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spin_unlock(&files->file_lock);
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task_unlock(p);
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read_unlock(&tasklist_lock);
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return 1;
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}
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}
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spin_unlock(&files->file_lock);
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}
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task_unlock(p);
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out:
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read_unlock(&tasklist_lock);
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return 0;
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}
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static int
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match_sid(const struct sk_buff *skb, pid_t sid)
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{
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struct task_struct *g, *p;
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struct file *file = skb->sk->sk_socket->file;
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int i, found=0;
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read_lock(&tasklist_lock);
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do_each_thread(g, p) {
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struct files_struct *files;
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if (p->signal->session != sid)
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continue;
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task_lock(p);
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files = p->files;
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if (files) {
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spin_lock(&files->file_lock);
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for (i=0; i < files->max_fds; i++) {
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if (fcheck_files(files, i) == file) {
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found = 1;
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break;
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}
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}
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spin_unlock(&files->file_lock);
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}
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task_unlock(p);
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if (found)
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goto out;
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} while_each_thread(g, p);
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out:
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read_unlock(&tasklist_lock);
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return found;
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}
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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@ -145,24 +45,6 @@ match(const struct sk_buff *skb,
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return 0;
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}
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if(info->match & IPT_OWNER_PID) {
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if (!match_pid(skb, info->pid) ^
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!!(info->invert & IPT_OWNER_PID))
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return 0;
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}
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if(info->match & IPT_OWNER_SID) {
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if (!match_sid(skb, info->sid) ^
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!!(info->invert & IPT_OWNER_SID))
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return 0;
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}
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if(info->match & IPT_OWNER_COMM) {
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if (!match_comm(skb, info->comm) ^
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!!(info->invert & IPT_OWNER_COMM))
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return 0;
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}
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return 1;
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}
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@ -173,6 +55,8 @@ checkentry(const char *tablename,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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const struct ipt_owner_info *info = matchinfo;
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if (hook_mask
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& ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
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printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
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@ -184,15 +68,13 @@ checkentry(const char *tablename,
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IPT_ALIGN(sizeof(struct ipt_owner_info)));
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return 0;
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}
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#ifdef CONFIG_SMP
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/* files->file_lock can not be used in a BH */
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if (((struct ipt_owner_info *)matchinfo)->match
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& (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
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printk("ipt_owner: pid, sid and command matching is broken "
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"on SMP.\n");
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if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
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printk("ipt_owner: pid, sid and command matching "
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"not supported anymore\n");
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return 0;
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}
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#endif
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return 1;
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}
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@ -20,71 +20,6 @@ MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
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MODULE_DESCRIPTION("IP6 tables owner matching module");
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MODULE_LICENSE("GPL");
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static int
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match_pid(const struct sk_buff *skb, pid_t pid)
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{
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struct task_struct *p;
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struct files_struct *files;
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int i;
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read_lock(&tasklist_lock);
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p = find_task_by_pid(pid);
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if (!p)
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goto out;
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task_lock(p);
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files = p->files;
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if(files) {
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spin_lock(&files->file_lock);
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for (i=0; i < files->max_fds; i++) {
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if (fcheck_files(files, i) == skb->sk->sk_socket->file) {
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spin_unlock(&files->file_lock);
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task_unlock(p);
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read_unlock(&tasklist_lock);
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return 1;
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}
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}
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spin_unlock(&files->file_lock);
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}
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task_unlock(p);
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out:
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read_unlock(&tasklist_lock);
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return 0;
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}
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static int
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match_sid(const struct sk_buff *skb, pid_t sid)
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{
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struct task_struct *g, *p;
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struct file *file = skb->sk->sk_socket->file;
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int i, found=0;
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read_lock(&tasklist_lock);
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do_each_thread(g, p) {
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struct files_struct *files;
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if (p->signal->session != sid)
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continue;
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task_lock(p);
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files = p->files;
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if (files) {
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spin_lock(&files->file_lock);
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for (i=0; i < files->max_fds; i++) {
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if (fcheck_files(files, i) == file) {
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found = 1;
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break;
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}
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}
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spin_unlock(&files->file_lock);
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}
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task_unlock(p);
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if (found)
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goto out;
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} while_each_thread(g, p);
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out:
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read_unlock(&tasklist_lock);
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return found;
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}
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static int
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match(const struct sk_buff *skb,
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@ -112,18 +47,6 @@ match(const struct sk_buff *skb,
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return 0;
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}
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if(info->match & IP6T_OWNER_PID) {
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if (!match_pid(skb, info->pid) ^
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!!(info->invert & IP6T_OWNER_PID))
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return 0;
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}
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if(info->match & IP6T_OWNER_SID) {
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if (!match_sid(skb, info->sid) ^
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!!(info->invert & IP6T_OWNER_SID))
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return 0;
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}
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return 1;
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}
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@ -134,6 +57,8 @@ checkentry(const char *tablename,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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const struct ip6t_owner_info *info = matchinfo;
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if (hook_mask
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& ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) {
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printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
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@ -142,14 +67,13 @@ checkentry(const char *tablename,
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if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info)))
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return 0;
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#ifdef CONFIG_SMP
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/* files->file_lock can not be used in a BH */
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if (((struct ip6t_owner_info *)matchinfo)->match
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& (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
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printk("ip6t_owner: pid and sid matching is broken on SMP.\n");
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if (info->match & (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
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printk("ipt_owner: pid and sid matching "
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"not supported anymore\n");
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return 0;
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}
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#endif
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return 1;
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}
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