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@linaro.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
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@linaro.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
Is this a new regression from 5.15.0? Is it also present on Linus's tree?
thanks,
greg k-h
On Thu, 6 Jan 2022 at 15:02, Greg Kroah-Hartman gregkh@linuxfoundation.org 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@linaro.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
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@linuxfoundation.org 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@linuxfoundation.org
- Naresh
On Thu, Jan 06, 2022 at 03:19:59PM +0530, Naresh Kamboju wrote:
On Thu, 6 Jan 2022 at 15:02, Greg Kroah-Hartman gregkh@linuxfoundation.org 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@linaro.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
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@linuxfoundation.org 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@linuxfoundation.org
Thanks, will go queue that up now.
greg k-h
-
Greg Kroah-Hartman -
Naresh Kamboju