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

From	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Newsgroups	linux.kernel
Subject	[PATCH 0/2] arm64: fix crash when reading /proc/kcore
Date	2017-06-08 21:50 +0200
Message-ID	<tQbBn-8th-9@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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(-)

-- 
2.9.3

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[PATCH 0/2] arm64: fix crash when reading /proc/kcore Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-06-08 21:50 +0200
  [PATCH 1/2] fs/proc: kcore: use kcore_list type to check for vmalloc/module address Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-06-08 21:50 +0200
  Re: [PATCH 0/2] arm64: fix crash when reading /proc/kcore Mark Rutland <mark.rutland@arm.com> - 2017-06-09 12:10 +0200
  Re: [PATCH 0/2] arm64: fix crash when reading /proc/kcore Laura Abbott <labbott@redhat.com> - 2017-06-09 20:10 +0200
  Re: [PATCH 0/2] arm64: fix crash when reading /proc/kcore Tan Xiaojun <tanxiaojun@huawei.com> - 2017-06-13 04:10 +0200
    Re: [PATCH 0/2] arm64: fix crash when reading /proc/kcore Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-06-13 09:20 +0200
      Re: [PATCH 0/2] arm64: fix crash when reading /proc/kcore Jiri Olsa <jolsa@redhat.com> - 2017-06-13 16:10 +0200

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