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authorJiri Olsa <jolsa@kernel.org>2014-12-10 21:23:50 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-16 06:59:03 -0800
commitac96652da2a760bbd8cb4dc74b6bf1c5d2c8babb (patch)
tree65d223c62fc6efc80502798834bbddacdc08e6c6 /arch
parent16e9d54b3f8158479e796188dcf45a6bfed18f03 (diff)
downloadlinux-linaro-stable-ac96652da2a760bbd8cb4dc74b6bf1c5d2c8babb.tar.gz
perf/x86/intel/uncore: Make sure only uncore events are collected
commit af91568e762d04931dcbdd6bef4655433d8b9418 upstream. The uncore_collect_events functions assumes that event group might contain only uncore events which is wrong, because it might contain any type of events. This bug leads to uncore framework touching 'not' uncore events, which could end up all sorts of bugs. One was triggered by Vince's perf fuzzer, when the uncore code touched breakpoint event private event space as if it was uncore event and caused BUG: BUG: unable to handle kernel paging request at ffffffff82822068 IP: [<ffffffff81020338>] uncore_assign_events+0x188/0x250 ... The code in uncore_assign_events() function was looking for event->hw.idx data while the event was initialized as a breakpoint with different members in event->hw union. This patch forces uncore_collect_events() to collect only uncore events. Reported-by: Vince Weaver <vince@deater.net> Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Yan, Zheng <zheng.z.yan@intel.com> Link: http://lkml.kernel.org/r/1418243031-20367-2-git-send-email-jolsa@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel_uncore.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index 8aac56bda7dc..7185af255fb5 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -2657,6 +2657,17 @@ static struct intel_uncore_box *uncore_event_to_box(struct perf_event *event)
return uncore_pmu_to_box(uncore_event_to_pmu(event), smp_processor_id());
}
+/*
+ * Using uncore_pmu_event_init pmu event_init callback
+ * as a detection point for uncore events.
+ */
+static int uncore_pmu_event_init(struct perf_event *event);
+
+static bool is_uncore_event(struct perf_event *event)
+{
+ return event->pmu->event_init == uncore_pmu_event_init;
+}
+
static int
uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader, bool dogrp)
{
@@ -2671,13 +2682,18 @@ uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader, b
return -EINVAL;
n = box->n_events;
- box->event_list[n] = leader;
- n++;
+
+ if (is_uncore_event(leader)) {
+ box->event_list[n] = leader;
+ n++;
+ }
+
if (!dogrp)
return n;
list_for_each_entry(event, &leader->sibling_list, group_entry) {
- if (event->state <= PERF_EVENT_STATE_OFF)
+ if (!is_uncore_event(event) ||
+ event->state <= PERF_EVENT_STATE_OFF)
continue;
if (n >= max_count)