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59 lines
2.4 KiB
Diff
59 lines
2.4 KiB
Diff
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From b3f0b1f694258b3b3debc5256eec94bb2a9eb454 Mon Sep 17 00:00:00 2001
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From: Swetha Chikkaboraiah <schikk@codeaurora.org>
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Date: Wed, 27 Jan 2016 11:46:54 +0530
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Subject: [PATCH] msm: perf: Protect buffer overflow due to malicious user
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In function krait_pmu_disable_event, parameter hwc comes from
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userspace and is untrusted.The function krait_clearpmu is called
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after the function get_krait_evtinfo.
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Function get_krait_evtinfo as parameter krait_evt_type variable
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which is used to extract the groupcode(reg) which is bound to
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KRAIT_MAX_L1_REG (is 3). After validation,one code path modifies
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groupcode(reg):If this code path executes, groupcode(reg) can be
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3,4, 5, or 6. In krait_clearpmu groupcode used to access array
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krait_functions whose size is 3. Since groupcode can be 3,4,5,6
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accessing array krait_functions lead to bufferoverlflow.
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This change will validate groupcode not to exceed 3.
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CVE-2016-0805 Bug:ANDROID-25773204
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Change-Id: I48c92adda137d8a074b4e1a367a468195a810ca1
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CRs-fixed: 962450
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Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>
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Signed-off-by: Karthik Jadala <karthikjk@codeaurora.org>
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---
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arch/arm/kernel/perf_event_msm_krait.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/arch/arm/kernel/perf_event_msm_krait.c b/arch/arm/kernel/perf_event_msm_krait.c
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index 49aae5a66b650..34f9b4e5b099d 100644
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--- a/arch/arm/kernel/perf_event_msm_krait.c
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+++ b/arch/arm/kernel/perf_event_msm_krait.c
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@@ -1,5 +1,5 @@
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/*
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- * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
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+ * Copyright (c) 2011-2014, 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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@@ -208,9 +208,6 @@ static unsigned int get_krait_evtinfo(unsigned int krait_evt_type,
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code = (krait_evt_type & 0x00FF0) >> 4;
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group = krait_evt_type & 0x0000F;
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- if ((group > 3) || (reg > KRAIT_MAX_L1_REG))
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- return -EINVAL;
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-
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if (prefix != KRAIT_EVT_PREFIX && prefix != KRAIT_VENUMEVT_PREFIX)
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return -EINVAL;
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@@ -221,6 +218,9 @@ static unsigned int get_krait_evtinfo(unsigned int krait_evt_type,
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reg += VENUM_BASE_OFFSET;
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}
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+ if ((group > 3) || (reg > KRAIT_MAX_L1_REG))
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+ return -EINVAL;
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+
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evtinfo->group_setval = 0x80000000 | (code << (group * 8));
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evtinfo->groupcode = reg;
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evtinfo->armv7_evt_type = evt_type_base[reg] | group;
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