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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-08-21 16:36:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-08-21 16:36:32 -0700 |
| commit | 7d06bafc4a49214068893acd8bfd2660554538ca (patch) | |
| tree | 6d81f9d6a33e8e837cddf0ce3b7bf53627d639c5 | |
| parent | 69bbe136a911bd5d45d0e633daaeb9d1239bf54f (diff) | |
| parent | ee7538a008a45050c8f706d38b600f55953169f9 (diff) | |
Merge tag 'arm64-stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64
Pull arm64 perf fixes from Catalin Marinas:
"Perf backend fixes for arm64 where the user can cause kernel panic
(discovered with Vince's fuzzing tool)"
* tag 'arm64-stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
arm64: perf: fix event validation for software group leaders
arm64: perf: fix array out of bounds access in armpmu_map_hw_event()
| -rw-r--r-- | arch/arm64/kernel/perf_event.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index 9ba33c40cdf8..12e6ccb88691 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -107,7 +107,12 @@ armpmu_map_cache_event(const unsigned (*cache_map) static int armpmu_map_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config) { - int mapping = (*event_map)[config]; + int mapping; + + if (config >= PERF_COUNT_HW_MAX) + return -EINVAL; + + mapping = (*event_map)[config]; return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping; } @@ -317,6 +322,9 @@ validate_event(struct pmu_hw_events *hw_events, struct hw_perf_event fake_event = event->hw; struct pmu *leader_pmu = event->group_leader->pmu; + if (is_software_event(event)) + return 1; + if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF) return 1; |