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linux/lib/test_fortify
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Nathan Chancellor c1f3e770ee fortify: Disable -Wstringop-overread in tests 
clang recently added support for -Wstringop-overread [1], which is on by
default like -Wfortify-source. This breaks the usage of -Werror in the
fortify tests, resulting in the following false positive warnings in the
kernel build:

  warning: unsafe memcmp() usage lacked '__read_overflow2' warning in lib/test_fortify/read_overflow2-memcmp.c
  warning: unsafe memcmp() usage lacked '__read_overflow' warning in lib/test_fortify/read_overflow-memcmp.c
  warning: unsafe memchr() usage lacked '__read_overflow' warning in lib/test_fortify/read_overflow-memchr.c

Examining the fortify test logs shows a warning like the following in
each of the failed logs:

  In file included from lib/test_fortify/read_overflow2-memcmp.c:5:
  lib/test_fortify/test_fortify.h:34:2: error: 'memcmp' reading 17 bytes from a region of size 16 [-Werror,-Wstringop-overread]
     34 |         TEST;
        |         ^
  lib/test_fortify/read_overflow2-memcmp.c:3:2: note: expanded from macro 'TEST'
      3 |         memcmp(large, small, sizeof(small) + 1)
        |         ^
  1 error generated.

Disable -Wstringop-overread for the fortify tests, as it defeats the
purpose of testing the Linux specific implementation of fortify, like
-Wfortify-source.

Cc: stable@vger.kernel.org
Closes: https://github.com/ClangBuiltLinux/linux/issues/2168
Link: 86f2e71cb8 [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260623-fix-test_fortify-for-clang-stringop-overread-v1-1-15ee8342a953@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
2026-07-15 09:00:11 -07:00
..
.gitignore fortify: refactor test_fortify Makefile to fix some build problems 2024-08-15 09:26:02 -07:00
Makefile fortify: Disable -Wstringop-overread in tests 2026-07-15 09:00:11 -07:00
read_overflow-memchr_inv.c
read_overflow-memchr.c
read_overflow-memcmp.c
read_overflow-memscan.c
read_overflow2_field-memcpy.c
read_overflow2_field-memmove.c fortify: Detect struct member overflows in memmove() at compile-time 2022-02-13 16:50:06 -08:00
read_overflow2-memcmp.c
read_overflow2-memcpy.c
read_overflow2-memmove.c
test_fortify.h
test_fortify.sh fortify: Cleanup temp file also on non-successful exit 2026-01-14 19:49:55 -08:00
write_overflow_field-memcpy.c
write_overflow_field-memmove.c fortify: Detect struct member overflows in memmove() at compile-time 2022-02-13 16:50:06 -08:00
write_overflow_field-memset.c fortify: Detect struct member overflows in memset() at compile-time 2022-02-13 16:50:06 -08:00
write_overflow-memcpy.c
write_overflow-memmove.c
write_overflow-memset.c
write_overflow-strcpy-lit.c
write_overflow-strcpy.c
write_overflow-strscpy.c