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Re: keys: GPF in request_key

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On Wed, Feb 1, 2017 at 2:48 PM, David Howells <dhowells@redhat.com> wrote:
> Dmitry Vyukov <dvyukov@google.com> wrote:
>
>>  request_key_and_link+0x2d8/0x1150 security/keys/request_key.c:549
>
> Can you disassemble this function for me?  There are several possible paths
> and without the argument to the syscall and whether there's a key that was
> matched, it's hard to say which path is being taken - but this might help
> determine that.

Here it is:
https://gist.githubusercontent.com/dvyukov/65efc41d00ef0033f9374853b9265c71/raw/9d8540dfb199b81f3d3534ec4cc6da378d07f5b2/gistfile1.txt

I actually know what were the arguments to the syscall. Since it
happened in a user process context, I know what syzkaller program it
was running at the time of the crash. It's just they are not
reproducible. Here are the 3 programs, and they are almost equivalent
as far as I can see. It's in syzkaller format, but I hope you can
decipher it, it's just syscall names, address and data in hex:
https://gist.githubusercontent.com/dvyukov/19bd59ffa286a74b49ca2371b69d4c5c/raw/004eaaa58a4ca775c008591fbb94eae78f92ef86/gistfile1.txt

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Thread

keys: GPF in request_key Dmitry Vyukov <dvyukov@google.com> - 2017-02-01 13:30 +0100
  Re: keys: GPF in request_key David Howells <dhowells@redhat.com> - 2017-02-01 14:20 +0100
    Re: keys: GPF in request_key Dmitry Vyukov <dvyukov@google.com> - 2017-02-01 14:30 +0100
  Re: keys: GPF in request_key David Howells <dhowells@redhat.com> - 2017-02-01 14:30 +0100
  Re: keys: GPF in request_key David Howells <dhowells@redhat.com> - 2017-02-01 14:50 +0100
    Re: keys: GPF in request_key Dmitry Vyukov <dvyukov@google.com> - 2017-02-01 15:10 +0100
      Re: keys: GPF in request_key David Howells <dhowells@redhat.com> - 2017-02-01 16:00 +0100
        Re: keys: GPF in request_key Dmitry Vyukov <dvyukov@google.com> - 2017-02-01 16:30 +0100
          Re: keys: GPF in request_key David Howells <dhowells@redhat.com> - 2017-02-01 16:50 +0100
            Re: keys: GPF in request_key Dmitry Vyukov <dvyukov@google.com> - 2017-02-01 17:00 +0100
              Re: keys: GPF in request_key David Howells <dhowells@redhat.com> - 2017-02-01 18:00 +0100
                Re: keys: GPF in request_key Dmitry Vyukov <dvyukov@google.com> - 2017-02-01 18:20 +0100

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