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authorCong Wang <xiyou.wangcong@gmail.com>2012-05-31 16:26:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-31 17:49:29 -0700
commit2344bec788b097b2d1198758bd29c583812b864e (patch)
tree3ffcf64931b7935ee4e16b81fb6ec6b732436dfa /fs/proc/base.c
parente7dcd9990e42ccfc798d4eb55e2dbf9d7d434c6b (diff)
downloadlinux-2344bec788b097b2d1198758bd29c583812b864e.tar.bz2
proc: use mm_access() instead of ptrace_may_access()
mm_access() handles this much better, and avoids some race conditions. Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index cca635d252d4..155dee600ed4 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2022,11 +2022,8 @@ static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
if (!task)
goto out_notask;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
- goto out;
-
- mm = get_task_mm(task);
- if (!mm)
+ mm = mm_access(task, PTRACE_MODE_READ);
+ if (IS_ERR_OR_NULL(mm))
goto out;
if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {