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Re: fs: NULL deref in atime_needs_update

From Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups linux.kernel
Subject Re: fs: NULL deref in atime_needs_update
Date 2016-02-29 18:30 +0100
Message-ID <r7zNT-60o-3@gated-at.bofh.it> (permalink)
References (5 earlier) <r7d0Z-5MI-5@gated-at.bofh.it> <r7fPc-7Pr-21@gated-at.bofh.it> <r7vKh-3rD-3@gated-at.bofh.it> <r7zbc-5xn-13@gated-at.bofh.it> <r7zkS-5AE-17@gated-at.bofh.it>
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On Mon, Feb 29, 2016 at 04:50:31PM +0000, Al Viro wrote:

> In __d_entry_type(), you mean?  Should be, along with READ_ONCE() there.
> AFAICS, ordering shouldn't be an issue anymore...

	FWIW, I've pushed the candidate fix (including the above) into
vfs.git#for-linus; I'd prefer to wait for confirmation that dcache.c
part is sufficient to fix the problem (_without_ reordering in lookup_fast())
before sending a pull request, though.

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Thread

Re: fs: NULL deref in atime_needs_update Ian Kent <raven@themaw.net> - 2016-02-24 04:20 +0100
  Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-24 05:50 +0100
    Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-24 11:10 +0100
      Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-24 11:20 +0100
        Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-24 14:40 +0100
          Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-24 16:20 +0100
            Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-25 09:30 +0100
              Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-25 17:40 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-26 22:30 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-26 23:10 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-27 23:30 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-28 17:10 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-28 18:10 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-28 21:10 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-29 10:40 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-29 13:40 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-29 17:20 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-29 14:10 +0100
                Re: fs: NULL deref in atime_needs_update David Howells <dhowells@redhat.com> - 2016-02-29 14:50 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-29 17:00 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-29 17:30 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-02-29 19:30 +0100
                Re: fs: NULL deref in atime_needs_update Dmitry Vyukov <dvyukov@google.com> - 2016-03-01 10:00 +0100
                Re: fs: NULL deref in atime_needs_update Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-29 17:50 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-29 18:00 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-29 18:30 +0100
                Re: fs: NULL deref in atime_needs_update Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-29 18:30 +0100
                Re: fs: NULL deref in atime_needs_update Al Viro <viro@ZenIV.linux.org.uk> - 2016-02-26 22:30 +0100

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