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Re: [PATCH] drm/i915: fix use-after-free in page_flip_completed()

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  Re: [PATCH] drm/i915: fix use-after-free in page_flip_completed() Chris Wilson <chris@chris-wilson.co.uk> - 2017-01-26 15:50 +0100
    Re: [Intel-gfx] [PATCH] drm/i915: fix use-after-free in  page_flip_completed() Daniel Vetter <daniel@ffwll.ch> - 2017-01-27 15:20 +0100

#1567479 — Re: [PATCH] drm/i915: fix use-after-free in page_flip_completed()

On Thu, Jan 26, 2017 at 05:32:11PM +0300, Andrey Ryabinin wrote:
> page_flip_completed() dereferences 'work' variable after executing
> queue_work(). This is not safe as the 'work' item might be already freed
> by queued work:
> 
>     BUG: KASAN: use-after-free in page_flip_completed+0x3ff/0x490 at addr ffff8803dc010f90
>     Call Trace:
>      __asan_report_load8_noabort+0x59/0x80
>      page_flip_completed+0x3ff/0x490
>      intel_finish_page_flip_mmio+0xe3/0x130
>      intel_pipe_handle_vblank+0x2d/0x40
>      gen8_irq_handler+0x4a7/0xed0
>      __handle_irq_event_percpu+0xf6/0x860
>      handle_irq_event_percpu+0x6b/0x160
>      handle_irq_event+0xc7/0x1b0
>      handle_edge_irq+0x1f4/0xa50
>      handle_irq+0x41/0x70
>      do_IRQ+0x9a/0x200
>      common_interrupt+0x89/0x89
> 
>     Freed:
>      kfree+0x113/0x4d0
>      intel_unpin_work_fn+0x29a/0x3b0
>      process_one_work+0x79e/0x1b70
>      worker_thread+0x611/0x1460
>      kthread+0x241/0x3a0
>      ret_from_fork+0x27/0x40
> 
> Move queue_work() after	trace_i915_flip_complete() to fix this.
> 
> Fixes: e5510fac98a7 ("drm/i915: add tracepoints for flip requests & completions")
> Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>

That's old, and indeed does seem to be present from that commit and not
exposed by something later.

Cc: <stable@vger.kernel.org> # v2.6.36+
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

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#1568398 — Re: [Intel-gfx] [PATCH] drm/i915: fix use-after-free in page_flip_completed()

On Thu, Jan 26, 2017 at 02:46:20PM +0000, Chris Wilson wrote:
> On Thu, Jan 26, 2017 at 05:32:11PM +0300, Andrey Ryabinin wrote:
> > page_flip_completed() dereferences 'work' variable after executing
> > queue_work(). This is not safe as the 'work' item might be already freed
> > by queued work:
> > 
> >     BUG: KASAN: use-after-free in page_flip_completed+0x3ff/0x490 at addr ffff8803dc010f90
> >     Call Trace:
> >      __asan_report_load8_noabort+0x59/0x80
> >      page_flip_completed+0x3ff/0x490
> >      intel_finish_page_flip_mmio+0xe3/0x130
> >      intel_pipe_handle_vblank+0x2d/0x40
> >      gen8_irq_handler+0x4a7/0xed0
> >      __handle_irq_event_percpu+0xf6/0x860
> >      handle_irq_event_percpu+0x6b/0x160
> >      handle_irq_event+0xc7/0x1b0
> >      handle_edge_irq+0x1f4/0xa50
> >      handle_irq+0x41/0x70
> >      do_IRQ+0x9a/0x200
> >      common_interrupt+0x89/0x89
> > 
> >     Freed:
> >      kfree+0x113/0x4d0
> >      intel_unpin_work_fn+0x29a/0x3b0
> >      process_one_work+0x79e/0x1b70
> >      worker_thread+0x611/0x1460
> >      kthread+0x241/0x3a0
> >      ret_from_fork+0x27/0x40
> > 
> > Move queue_work() after	trace_i915_flip_complete() to fix this.
> > 
> > Fixes: e5510fac98a7 ("drm/i915: add tracepoints for flip requests & completions")
> > Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
> 
> That's old, and indeed does seem to be present from that commit and not
> exposed by something later.
> 
> Cc: <stable@vger.kernel.org> # v2.6.36+
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

Applied, thanks for patch&review.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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