On Wed, Sep 16, 2020 at 03:54:02PM +0200, pet...@infradead.org wrote:
> On Wed, Sep 16, 2020 at 01:53:11PM +0200, Jiri Olsa wrote:
> > There's a possible race in perf_mmap_close when checking ring buffer's
> > mmap_count refcount value. The problem is that the mmap_count check is
> > not atomic bec
On Wed, Sep 16, 2020 at 01:53:11PM +0200, Jiri Olsa wrote:
> There's a possible race in perf_mmap_close when checking ring buffer's
> mmap_count refcount value. The problem is that the mmap_count check is
> not atomic because we call atomic_dec and atomic_read separately.
>
> perf_mmap_close:
>
On Wed, Sep 16, 2020 at 01:53:11PM +0200, Jiri Olsa wrote:
> There's a possible race in perf_mmap_close when checking ring buffer's
> mmap_count refcount value. The problem is that the mmap_count check is
> not atomic because we call atomic_dec and atomic_read separately.
>
> perf_mmap_close:
>
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