diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-12-11 00:45:10 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-11 02:41:09 +0100 |
| commit | 4af1036df4dd4f0d59fad9d82ed456bfa2e73fa6 (patch) | |
| tree | db1e1ccc62ddffb35e429d9d306752a27ac4d9de | |
| parent | fs/proc.c: use rb_entry_safe() instead of rb_entry() (diff) | |
| download | linux-4af1036df4dd4f0d59fad9d82ed456bfa2e73fa6.tar.xz linux-4af1036df4dd4f0d59fad9d82ed456bfa2e73fa6.zip | |
proc: task_state: read cred->group_info outside of task_lock()
task_state() reads cred->group_info under task_lock() because a long ago
it was task_struct->group_info and it was actually protected by
task->alloc_lock. Today this task_unlock() after rcu_read_unlock() just
adds the confusion, move task_unlock() up.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Cc: Sterling Alexander <stalexan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roland McGrath <roland@hack.frob.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/array.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index cd3653e4f35c..b5810c228c10 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -201,11 +201,10 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, "FDSize:\t%d\n" "Groups:\t", fdt ? fdt->max_fds : 0); + task_unlock(p); rcu_read_unlock(); group_info = cred->group_info; - task_unlock(p); - for (g = 0; g < group_info->ngroups; g++) seq_printf(m, "%d ", from_kgid_munged(user_ns, GROUP_AT(group_info, g))); |