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authorLinus Torvalds2019-02-17 08:38:13 -0800
committerLinus Torvalds2019-02-17 08:38:13 -0800
commitdd6f29da695dbfe5a8ff84ebfdd2110d68e8f511 (patch)
tree015ae77d5d6abcb1ec56d79c51541ddf5f07ff46 /kernel
parentc5f1ac5e9afb199638414be77cbc22eb68e14d97 (diff)
parent528871b456026e6127d95b1b2bd8e3a003dc1614 (diff)
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar: "Two fixes on the kernel side: fix an over-eager condition that failed larger perf ring-buffer sizes, plus fix crashes in the Intel BTS code for a corner case, found by fuzzing" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/core: Fix impossible ring-buffer sizes warning perf/x86: Add check_period PMU callback
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c16
-rw-r--r--kernel/events/ring_buffer.c2
2 files changed, 17 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index e5ede6918050..26d6edab051a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4963,6 +4963,11 @@ static void __perf_event_period(struct perf_event *event,
}
}
+static int perf_event_check_period(struct perf_event *event, u64 value)
+{
+ return event->pmu->check_period(event, value);
+}
+
static int perf_event_period(struct perf_event *event, u64 __user *arg)
{
u64 value;
@@ -4979,6 +4984,9 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
if (event->attr.freq && value > sysctl_perf_event_sample_rate)
return -EINVAL;
+ if (perf_event_check_period(event, value))
+ return -EINVAL;
+
event_function_call(event, __perf_event_period, &value);
return 0;
@@ -9391,6 +9399,11 @@ static int perf_pmu_nop_int(struct pmu *pmu)
return 0;
}
+static int perf_event_nop_int(struct perf_event *event, u64 value)
+{
+ return 0;
+}
+
static DEFINE_PER_CPU(unsigned int, nop_txn_flags);
static void perf_pmu_start_txn(struct pmu *pmu, unsigned int flags)
@@ -9691,6 +9704,9 @@ got_cpu_context:
pmu->pmu_disable = perf_pmu_nop_void;
}
+ if (!pmu->check_period)
+ pmu->check_period = perf_event_nop_int;
+
if (!pmu->event_idx)
pmu->event_idx = perf_event_idx_default;
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 309ef5a64af5..5ab4fe3b1dcc 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -734,7 +734,7 @@ struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
size = sizeof(struct ring_buffer);
size += nr_pages * sizeof(void *);
- if (order_base_2(size) >= MAX_ORDER)
+ if (order_base_2(size) >= PAGE_SHIFT+MAX_ORDER)
goto fail;
rb = kzalloc(size, GFP_KERNEL);