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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2012-05-31 16:26:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-31 17:49:29 -0700 |
| commit | 2344bec788b097b2d1198758bd29c583812b864e (patch) | |
| tree | 3ffcf64931b7935ee4e16b81fb6ec6b732436dfa | |
| parent | e7dcd9990e42ccfc798d4eb55e2dbf9d7d434c6b (diff) | |
| download | linux-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>
| -rw-r--r-- | fs/proc/base.c | 7 |
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)) { |