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Re: use-after-free in __perf_install_in_context

From Alexei Starovoitov <alexei.starovoitov@gmail.com>
Newsgroups linux.kernel
Subject Re: use-after-free in __perf_install_in_context
Date 2015-12-10 18:10 +0100
Message-ID <qEcT8-Dg-25@gated-at.bofh.it> (permalink)
References (5 earlier) <qDvl9-5U7-49@gated-at.bofh.it> <qDwAy-6Bm-11@gated-at.bofh.it> <qDJ4K-6qQ-13@gated-at.bofh.it> <qE0yC-Iu-21@gated-at.bofh.it> <qE5oC-47J-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Dec 10, 2015 at 10:02:51AM +0100, Peter Zijlstra wrote:
> On Wed, Dec 09, 2015 at 07:54:35PM -0800, Alexei Starovoitov wrote:
> > Freeing memory is a requirement regardless.
> > Even when kernel running with kasan, there must be a way to stop
> > stack collection and free that memory.
> > You cannot treat kernel as your test program or 'device under test'.
> 
> Relax, that is exactly what lockdep does. It cannot dynamically allocate
> things because allocators use lock etc..
> 
> Its fine to build up state for debug bits, esp. if its bounded, like the
> number of unique callchains.

except the code in question is doing unbounded alloc_pages()

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Thread

use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-04 21:10 +0100
  Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-04 21:40 +0100
    Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-04 22:10 +0100
      Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-07 12:10 +0100
        Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-07 12:10 +0100
          Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-07 12:30 +0100
  Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-07 16:40 +0100
    Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-07 17:10 +0100
      Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-08 04:30 +0100
        Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-08 17:20 +0100
          Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-08 19:00 +0100
            Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-08 19:00 +0100
              Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-08 19:10 +0100
                Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-08 19:40 +0100
                Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-08 21:00 +0100
                Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-09 10:20 +0100
                Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-10 05:00 +0100
                Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-10 10:10 +0100
                Re: use-after-free in __perf_install_in_context Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-10 18:10 +0100
                Re: use-after-free in __perf_install_in_context Ingo Molnar <mingo@kernel.org> - 2015-12-11 09:20 +0100
      Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-08 17:50 +0100
        Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-08 20:20 +0100
          Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-10 21:00 +0100
  Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-08 17:30 +0100
    Re: use-after-free in __perf_install_in_context Dmitry Vyukov <dvyukov@google.com> - 2015-12-08 18:00 +0100
  Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-08 17:30 +0100
    Re: use-after-free in __perf_install_in_context Ingo Molnar <mingo@kernel.org> - 2015-12-08 20:00 +0100
      Re: use-after-free in __perf_install_in_context Peter Zijlstra <peterz@infradead.org> - 2015-12-09 10:10 +0100

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