linux-kernel - test_vsyscall.c:500:22: warning: '__builtin_memcmp_eq' specified bound 4096 exceeds source size 0

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Date:   Thu, 6 Jan 2022 14:55:53 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     linux-stable <stable@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, X86 ML <x86@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jann Horn <jannh@...gle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: test_vsyscall.c:500:22: warning: '__builtin_memcmp_eq' specified
 bound 4096 exceeds source size 0

While building selftests the following warnings were noticed for x86_64
architecture on Linux stable v5.15.13 kernel.

metadata:
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
  git commit: 734eb1fd2073f503f5c6b44f1c0d453ca6986b84
  git describe: v5.15.13
  toolchain":  gcc-11
  kernel-config: https://builds.tuxbuild.com/23HFo8abXIL6i4FFfSYiJlqAYMW/config

x86_64-linux-gnu-gcc -m64 -o \
/home/tuxbuild/.cache/tuxmake/builds/current/kselftest/x86/test_vsyscall_64 \
 -O2 -g -std=gnu99 -pthread -Wall -no-pie \
 -DCAN_BUILD_64 test_vsyscall.c helpers.h -lrt -ldl

test_vsyscall.c: In function 'test_process_vm_readv':
test_vsyscall.c:500:22: warning: '__builtin_memcmp_eq' specified bound
4096 exceeds source size 0 [-Wstringop-overread]
  500 |                 if (!memcmp(buf, (const void
*)0xffffffffff600000, 4096)) {
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Build link:
https://builds.tuxbuild.com/23HFo8abXIL6i4FFfSYiJlqAYMW/

# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake

tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-11 \
 --kconfig https://builds.tuxbuild.com/23HFo8abXIL6i4FFfSYiJlqAYMW/config \
 cpupower headers kernel kselftest kselftest-merge modules


--
Linaro LKFT
https://lkft.linaro.org