This is a note to let you know that I've just added the patch titled
arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-cpuinfo-missing-null-terminator-in-compat_hwcap_str.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f228b494e56d949be8d8ea09d4f973d1979201bf Mon Sep 17 00:00:00 2001
From: Julien Grall <julien.grall@xxxxxxx>
Date: Tue, 10 May 2016 15:40:31 +0100
Subject: arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str
From: Julien Grall <julien.grall@xxxxxxx>
commit f228b494e56d949be8d8ea09d4f973d1979201bf upstream.
The loop that browses the array compat_hwcap_str will stop when a NULL
is encountered, however NULL is missing at the end of array. This will
lead to overrun until a NULL is found somewhere in the following memory.
In reality, this works out because the compat_hwcap2_str array tends to
follow immediately in memory, and that *is* terminated correctly.
Furthermore, the unsigned int compat_elf_hwcap is checked before
printing each capability, so we end up doing the right thing because
the size of the two arrays is less than 32. Still, this is an obvious
mistake and should be fixed.
Note for backporting: commit 12d11817eaafa414 ("arm64: Move
/proc/cpuinfo handling code") moved this code in v4.4. Prior to that
commit, the same change should be made in arch/arm64/kernel/setup.c.
Fixes: 44b82b7700d0 "arm64: Fix up /proc/cpuinfo"
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/cpuinfo.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -85,7 +85,8 @@ static const char *const compat_hwcap_st
"idivt",
"vfpd32",
"lpae",
- "evtstrm"
+ "evtstrm",
+ NULL
};
static const char *const compat_hwcap2_str[] = {
Patches currently in stable-queue which might be from julien.grall@xxxxxxx are
queue-4.4/arm64-cpuinfo-missing-null-terminator-in-compat_hwcap_str.patch
queue-4.4/arm64-implement-ptep_set_access_flags-for-hardware-af-dbm.patch
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