xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Browse Source 
Pull proc fix from Eric Biederman:
 "A brown paper bag slipped through my proc changes, and syzcaller
  caught it when the code ended up in your tree.

  I have opted to fix it the simplest cleanest way I know how, so there
  is no reasonable chance for the bug to repeat"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  proc: Use a dedicated lock in struct pid
This commit is contained in:
Linus Torvalds
2020-04-10 12:59:56 -07:00
parent 75bdc9293d 63f818f46a
commit 87ad46e601
3 changed files with 7 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
fs/proc/base.c
View File

@@ -1839,9 +1839,9 @@ void proc_pid_evict_inode(struct proc_inode *ei)
struct pid *pid = ei->pid;
if (S_ISDIR(ei->vfs_inode.i_mode)) {
spin_lock(&pid->wait_pidfd.lock);
spin_lock(&pid->lock);
hlist_del_init_rcu(&ei->sibling_inodes);
spin_unlock(&pid->wait_pidfd.lock);
spin_unlock(&pid->lock);
}
put_pid(pid);
@@ -1877,9 +1877,9 @@ struct inode *proc_pid_make_inode(struct super_block * sb,
/* Let the pid remember us for quick removal */
ei->pid = pid;
if (S_ISDIR(mode)) {
spin_lock(&pid->wait_pidfd.lock);
spin_lock(&pid->lock);
hlist_add_head_rcu(&ei->sibling_inodes, &pid->inodes);
spin_unlock(&pid->wait_pidfd.lock);
spin_unlock(&pid->lock);
}
task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
@@ -3273,7 +3273,7 @@ static const struct inode_operations proc_tgid_base_inode_operations = {
void proc_flush_pid(struct pid *pid)
{
proc_invalidate_siblings_dcache(&pid->inodes, &pid->wait_pidfd.lock);
proc_invalidate_siblings_dcache(&pid->inodes, &pid->lock);
put_pid(pid);
}