mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-20 21:34:24 -05:00
59 lines
2.4 KiB
Diff
59 lines
2.4 KiB
Diff
From b3f0b1f694258b3b3debc5256eec94bb2a9eb454 Mon Sep 17 00:00:00 2001
|
|
From: Swetha Chikkaboraiah <schikk@codeaurora.org>
|
|
Date: Wed, 27 Jan 2016 11:46:54 +0530
|
|
Subject: [PATCH] msm: perf: Protect buffer overflow due to malicious user
|
|
|
|
In function krait_pmu_disable_event, parameter hwc comes from
|
|
userspace and is untrusted.The function krait_clearpmu is called
|
|
after the function get_krait_evtinfo.
|
|
Function get_krait_evtinfo as parameter krait_evt_type variable
|
|
which is used to extract the groupcode(reg) which is bound to
|
|
KRAIT_MAX_L1_REG (is 3). After validation,one code path modifies
|
|
groupcode(reg):If this code path executes, groupcode(reg) can be
|
|
3,4, 5, or 6. In krait_clearpmu groupcode used to access array
|
|
krait_functions whose size is 3. Since groupcode can be 3,4,5,6
|
|
accessing array krait_functions lead to bufferoverlflow.
|
|
This change will validate groupcode not to exceed 3.
|
|
|
|
CVE-2016-0805 Bug:ANDROID-25773204
|
|
|
|
Change-Id: I48c92adda137d8a074b4e1a367a468195a810ca1
|
|
CRs-fixed: 962450
|
|
Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>
|
|
Signed-off-by: Karthik Jadala <karthikjk@codeaurora.org>
|
|
---
|
|
arch/arm/kernel/perf_event_msm_krait.c | 8 ++++----
|
|
1 file changed, 4 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/arch/arm/kernel/perf_event_msm_krait.c b/arch/arm/kernel/perf_event_msm_krait.c
|
|
index 49aae5a66b650..34f9b4e5b099d 100644
|
|
--- a/arch/arm/kernel/perf_event_msm_krait.c
|
|
+++ b/arch/arm/kernel/perf_event_msm_krait.c
|
|
@@ -1,5 +1,5 @@
|
|
/*
|
|
- * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
|
|
+ * Copyright (c) 2011-2014, 2016 The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
@@ -208,9 +208,6 @@ static unsigned int get_krait_evtinfo(unsigned int krait_evt_type,
|
|
code = (krait_evt_type & 0x00FF0) >> 4;
|
|
group = krait_evt_type & 0x0000F;
|
|
|
|
- if ((group > 3) || (reg > KRAIT_MAX_L1_REG))
|
|
- return -EINVAL;
|
|
-
|
|
if (prefix != KRAIT_EVT_PREFIX && prefix != KRAIT_VENUMEVT_PREFIX)
|
|
return -EINVAL;
|
|
|
|
@@ -221,6 +218,9 @@ static unsigned int get_krait_evtinfo(unsigned int krait_evt_type,
|
|
reg += VENUM_BASE_OFFSET;
|
|
}
|
|
|
|
+ if ((group > 3) || (reg > KRAIT_MAX_L1_REG))
|
|
+ return -EINVAL;
|
|
+
|
|
evtinfo->group_setval = 0x80000000 | (code << (group * 8));
|
|
evtinfo->groupcode = reg;
|
|
evtinfo->armv7_evt_type = evt_type_base[reg] | group;
|