[PATCH 0/2] arm64: fix crash when reading /proc/kcore

From: Ard Biesheuvel
Date: Thu Jun 08 2017 - 15:41:59 EST


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(-)

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2.9.3