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| author | Like Xu <likexu@tencent.com> | 2022-08-31 11:53:22 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2022-09-28 22:47:20 +0300 |
| commit | c23981df6642eec1da94a8125ec0ec402f7b1b7b (patch) | |
| tree | 9928e4da36c800caf694c8572bad5a9e71053441 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 31d3b871f5ee9b195d90b4d14b74a7864209c6e8 (diff) | |
| download | linux-c23981df6642eec1da94a8125ec0ec402f7b1b7b.tar.xz | |
KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask
In the extreme case of host counters multiplexing and contention, the
perf_event requested by the guest's pebs counter is not allocated to any
actual physical counter, in which case hw.idx is bookkept as -1,
resulting in an out-of-bounds access to host_cross_mapped_mask.
Fixes: 854250329c02 ("KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations")
Signed-off-by: Like Xu <likexu@tencent.com>
Link: https://lore.kernel.org/r/20220831085328.45489-2-likexu@tencent.com
[sean: expand comment to explain how a negative idx can be encountered]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions