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64 lines
2.5 KiB
Diff
64 lines
2.5 KiB
Diff
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From 9f261e5dfe101bbe35043822a89bffa78e080b3b Mon Sep 17 00:00:00 2001
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From: "Se Wang (Patrick) Oh" <sewango@codeaurora.org>
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Date: Wed, 2 Sep 2015 21:07:47 -0700
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Subject: arm64: Fix out of bound access to compat_hwcap_str
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As compat_hwcap_str[] doesn't end with 'NULL', c_show()
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tries to read the next element even after the end of the
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array. So add 'NULL' at the end of compat_hwcap_str[].
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Below is the KASan report for referencing.
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BUG: KASan: out of bounds access in c_show+0x110/0x248 at addr ffffffc0011f6370
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Read of size 8 by task pool-1-thread-1/10526
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page:ffffffbac14b39c0 count:1 mapcount:0 mapping: (null) index:0x0
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flags: 0x400(reserved)
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page dumped because: kasan: bad access detected
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Address belongs to variable compat_hwcap_str+0xb0/0xe0
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CPU: 0 PID: 10526 Comm: pool-1-thread-1 Tainted: G B W 3.18.18-ga7b28e9-11552-ge4a827f #1
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Hardware name: Qualcomm Technologies, Inc. MSM 8996 v2 + PMI8994 MTP (DT)
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Call trace:
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[<ffffffc000089ec4>] dump_backtrace+0x0/0x1c4
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[<ffffffc00008a098>] show_stack+0x10/0x1c
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[<ffffffc0011a7c58>] dump_stack+0x74/0xc8
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[<ffffffc00020e94c>] kasan_report_error+0x2b0/0x408
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[<ffffffc00020eb80>] kasan_report+0x34/0x40
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[<ffffffc00020db14>] __asan_load8+0x84/0x90
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[<ffffffc000088ae8>] c_show+0x10c/0x248
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[<ffffffc000245bb8>] traverse+0x1a8/0x320
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[<ffffffc000245dc8>] seq_lseek+0x98/0x148
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[<ffffffc00028f4e0>] proc_reg_llseek+0xa0/0xd8
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[<ffffffc000217d1c>] vfs_llseek+0x5c/0x70
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[<ffffffc000218b0c>] SyS_lseek+0x48/0x80
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[<ffffffc000218b50>] compat_SyS_lseek+0xc/0x18
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Memory state around the buggy address:
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ffffffc0011f6200: 00 00 fa fa fa fa fa fa 00 03 fa fa fa fa fa fa
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ffffffc0011f6280: 04 fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
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>ffffffc0011f6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa fa
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^
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ffffffc0011f6380: fa fa fa fa 00 00 00 00 00 00 fa fa fa fa fa fa
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ffffffc0011f6400: 02 fa fa fa fa fa fa fa 00 00 00 02 fa fa fa fa
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Change-Id: I5e2098f9a7a676c47a01baf10de3ac1c86265e69
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Signed-off-by: Se Wang (Patrick) Oh <sewango@codeaurora.org>
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---
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arch/arm64/kernel/setup.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
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index 58e7c14..1da40ef 100644
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--- a/arch/arm64/kernel/setup.c
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+++ b/arch/arm64/kernel/setup.c
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@@ -488,7 +488,8 @@ static const char *compat_hwcap_str[] = {
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"idivt",
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"vfpd32",
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"lpae",
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- "evtstrm"
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+ "evtstrm",
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+ NULL
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};
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static const char *compat_hwcap2_str[] = {
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--
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cgit v1.1
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