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proc: use mm_access() instead of ptrace_may_access()

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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>
This commit is contained in:
Cong Wang 2012-05-31 16:26:18 -07:00 committed by Linus Torvalds
parent e7dcd9990e
commit 2344bec788
1 changed files with 2 additions and 5 deletions
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7
fs/proc/base.c
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@ -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)) {