[PATCH 0/2] arm64: fix crash when reading /proc/kcore
Laura Abbott
labbott at redhat.com
Fri Jun 9 11:05:04 PDT 2017
On 06/08/2017 12:41 PM, Ard Biesheuvel wrote:
> This is a follow-up to patches from zhonjiang [0] and myself [1] that aim
> to solve a problem in the kcore code, which gets confused by the presence
> of block mappings in the vmalloc region.
>
> While fixing the crash is quite straight forward [2], we need to tweak
> the kcore code itself to ensure that it operates correctly on arm64.
> Fortunately, we can achieve this with two very simple changes:
>
> - replace a call to is_vmalloc_or_module_addr() in read_kcore() with a
> comparison of the kclist type field (#1)
> - enable CONFIG_ARCH_PROC_KCORE_TEXT for arm64 (#2)
>
> [0] http://marc.info/?l=linux-mm&m=149632393629295&w=2
> [1] http://marc.info/?l=linux-mm&m=149685966530180&w=2
> [2] http://marc.info/?l=linux-mm&m=149694975123959&w=2
>
> Ard Biesheuvel (2):
> fs/proc: kcore: use kcore_list type to check for vmalloc/module
> address
> arm64: mm: select CONFIG_ARCH_PROC_KCORE_TEXT
>
> arch/arm64/Kconfig | 3 +++
> fs/proc/kcore.c | 2 +-
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
Reviewed-by: Laura Abbott <labbott at redhat.com>
I wish there was actual Kconfig help text for CONFIG_ARCH_PROC_KCORE_TEXT
instead of having to go into kcore.c to read about how it was used but
that can be fixed up separately.
Thanks,
Laura
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