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>
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@ -2022,11 +2022,8 @@ static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
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if (!task)
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goto out_notask;
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if (!ptrace_may_access(task, PTRACE_MODE_READ))
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goto out;
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mm = get_task_mm(task);
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if (!mm)
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mm = mm_access(task, PTRACE_MODE_READ);
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if (IS_ERR_OR_NULL(mm))
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goto out;
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if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
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