On Thu, 6 Jan 2022 at 15:02, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, Jan 06, 2022 at 02:55:53PM +0530, Naresh Kamboju wrote: > > 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@xxxxxxxxxx> > > > > 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 > > Is this a new regression from 5.15.0? Is it also present on Linus's tree? This build warning is not present in Linus's tree. Following patch to be backported to 5.15.x --- >From dd40f44eabe1e122c6852fabb298aac05b083fce Mon Sep 17 00:00:00 2001 From: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> Date: Thu, 21 Oct 2021 15:33:33 -0600 Subject: selftests: x86: fix [-Wstringop-overread] warn in test_process_vm_readv() Fix the following [-Wstringop-overread] by passing in the variable instead of the value. 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)) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> - Naresh
