diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2009-07-10 03:27:38 +0200 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-08-10 20:48:32 +1000 |
| commit | 00f89d218523b9bf6b522349c039d5ac80aa536d (patch) | |
| tree | cde7a8bde2798e4fb3ae28756f6cedd4db9191cc /fs/proc/task_mmu.c | |
| parent | 13f0feafa6b8aead57a2a328e2fca6a5828bf286 (diff) | |
mm_for_maps: shift down_read(mmap_sem) to the caller
mm_for_maps() takes ->mmap_sem after security checks, this looks
strange and obfuscates the locking rules. Move this lock to its
single caller, m_start().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'fs/proc/task_mmu.c')
| -rw-r--r-- | fs/proc/task_mmu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 6f61b7cc32e0..9bd8be1d235c 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -119,6 +119,7 @@ static void *m_start(struct seq_file *m, loff_t *pos) mm = mm_for_maps(priv->task); if (!mm) return NULL; + down_read(&mm->mmap_sem); tail_vma = get_gate_vma(priv->task); priv->tail_vma = tail_vma; |