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arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str

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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 12d11817ea ("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: 44b82b7700 "arm64: Fix up /proc/cpuinfo"
Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julien Grall 2016-05-10 15:40:31 +01:00 • committed by Greg Kroah-Hartman
parent 7e1c1db08e
commit 44f47d94e8
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kernel/cpuinfo.c
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@ -85,7 +85,8 @@ static const char *const compat_hwcap_str[] = {
"idivt", "idivt",
"vfpd32", "vfpd32",
"lpae", "lpae",
"evtstrm" "evtstrm",
NULL
}; };
static const char *const compat_hwcap2_str[] = { static const char *const compat_hwcap2_str[] = {