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

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Message-Id: <20170608194139.9250-1-ard.biesheuvel@linaro.org>
Date:   Thu,  8 Jun 2017 19:41:37 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, jolsa@...nel.org,
        mingo@...nel.org, akpm@...ux-foundation.org, zhongjiang@...wei.com,
        labbott@...oraproject.org, mark.rutland@....com,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH 0/2] arm64: fix crash when reading /proc/kcore

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