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102 lines
2.7 KiB
Diff
102 lines
2.7 KiB
Diff
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From a599a7a83745820b3e1bee9d4b625bd54337e4d0 Mon Sep 17 00:00:00 2001
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From: Kishor PK <kpbhat@codeaurora.org>
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Date: Thu, 18 Feb 2016 15:26:50 +0530
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Subject: msm: perf: validate input argument of ev_constraints functions
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Validate input argument before writing into
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pmu_constraints_codes array.
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CRs-Fixed: 975404
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Change-Id: Id68b1d2201ab1af783af2236833b1dc894e08cc7
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Signed-off-by: Kishor PK <kpbhat@codeaurora.org>
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---
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arch/arm/mach-msm/perf_event_msm_krait_l2.c | 23 +++++++++++++++++------
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1 file changed, 17 insertions(+), 6 deletions(-)
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diff --git a/arch/arm/mach-msm/perf_event_msm_krait_l2.c b/arch/arm/mach-msm/perf_event_msm_krait_l2.c
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index 65a5d2f..43233ab 100644
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--- a/arch/arm/mach-msm/perf_event_msm_krait_l2.c
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+++ b/arch/arm/mach-msm/perf_event_msm_krait_l2.c
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@@ -1,5 +1,5 @@
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/*
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- * Copyright (c) 2011,2012,2014 The Linux Foundation. All rights reserved.
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+ * Copyright (c) 2011,2012,2014,2016 The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@@ -18,13 +18,15 @@
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#include <mach/msm-krait-l2-accessors.h>
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+#define PMU_CODES_SIZE 64
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+
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/*
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* The L2 PMU is shared between all CPU's, so protect
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* its bitmap access.
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*/
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struct pmu_constraints {
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u64 pmu_bitmap;
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- u8 codes[64];
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+ u8 codes[PMU_CODES_SIZE];
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raw_spinlock_t lock;
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} l2_pmu_constraints = {
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.pmu_bitmap = 0,
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@@ -427,10 +429,9 @@ static int msm_l2_test_set_ev_constraint(struct perf_event *event)
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u8 group = evt_type & 0x0000F;
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u8 code = (evt_type & 0x00FF0) >> 4;
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unsigned long flags;
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- u32 err = 0;
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+ int err = 0;
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u64 bitmap_t;
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u32 shift_idx;
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-
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if (evt_prefix == L2_TRACECTR_PREFIX)
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return err;
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/*
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@@ -444,6 +445,11 @@ static int msm_l2_test_set_ev_constraint(struct perf_event *event)
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shift_idx = ((reg * 4) + group);
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+ if (shift_idx >= PMU_CODES_SIZE) {
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+ err = -EINVAL;
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+ goto out;
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+ }
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+
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bitmap_t = 1 << shift_idx;
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if (!(l2_pmu_constraints.pmu_bitmap & bitmap_t)) {
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@@ -484,6 +490,7 @@ static int msm_l2_clear_ev_constraint(struct perf_event *event)
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unsigned long flags;
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u64 bitmap_t;
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u32 shift_idx;
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+ int err = 1;
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if (evt_prefix == L2_TRACECTR_PREFIX)
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return 1;
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@@ -491,6 +498,10 @@ static int msm_l2_clear_ev_constraint(struct perf_event *event)
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shift_idx = ((reg * 4) + group);
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+ if (shift_idx >= PMU_CODES_SIZE) {
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+ err = -EINVAL;
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+ goto out;
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+ }
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bitmap_t = 1 << shift_idx;
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/* Clear constraint bit. */
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@@ -498,9 +509,9 @@ static int msm_l2_clear_ev_constraint(struct perf_event *event)
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/* Clear code. */
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l2_pmu_constraints.codes[shift_idx] = -1;
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-
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+out:
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raw_spin_unlock_irqrestore(&l2_pmu_constraints.lock, flags);
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- return 1;
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+ return err;
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}
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int get_num_events(void)
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--
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cgit v1.1
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