https://github.com/google/kmsan
Revision e6bc8833d80fb695515a8144aa1dc13468db9d4d authored by Alexander Potapenko on 27 February 2023, 15:44:58 UTC, committed by Alexander Potapenko on 19 June 2023, 08:56:03 UTC
lib/string.c is built with -ffreestanding, which prevents the compiler from replacing certain functions with calls to their library versions. On the other hand, this also prevents Clang and GCC from instrumenting calls to memcpy() when building with KASAN, KCSAN or KMSAN: - KASAN normally replaces memcpy() with __asan_memcpy() with the additional cc-param,asan-kernel-mem-intrinsic-prefix=1; - KCSAN and KMSAN replace memcpy() with __tsan_memcpy() and __msan_memcpy() by default. To let the tools catch memory accesses from strlcpy/strlcat, replace the calls to memcpy() with __builtin_memcpy(), which KASAN, KCSAN and KMSAN are able to replace even in -ffreestanding mode. This preserves the behavior in normal builds (__builtin_memcpy() ends up being replaced with memcpy()), and does not introduce new instrumentation in unwanted places, as strlcpy/strlcat are already instrumented. Suggested-by: Marco Elver <elver@google.com> Signed-off-by: Alexander Potapenko <glider@google.com> Link: https://lore.kernel.org/all/20230224085942.1791837-1-elver@google.com/ Acked-by: Kees Cook <keescook@chromium.org>
1 parent 11aac78
Tip revision: e6bc8833d80fb695515a8144aa1dc13468db9d4d authored by Alexander Potapenko on 27 February 2023, 15:44:58 UTC
string: use __builtin_memcpy() in strlcpy/strlcat
string: use __builtin_memcpy() in strlcpy/strlcat
Tip revision: e6bc883
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| LICENSES | ||
| arch | ||
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| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
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| virt | ||
| .clang-format | -rw-r--r-- | 20.1 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .config.example | -rw-r--r-- | 148.6 KB |
| .config.extended | -rw-r--r-- | 133.2 KB |
| .get_maintainer.ignore | -rw-r--r-- | 151 bytes |
| .gitattributes | -rw-r--r-- | 90 bytes |
| .gitignore | -rw-r--r-- | 2.1 KB |
| .mailmap | -rw-r--r-- | 28.0 KB |
| .rustfmt.toml | -rw-r--r-- | 369 bytes |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 100.1 KB |
| Kbuild | -rw-r--r-- | 2.5 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 694.2 KB |
| Makefile | -rw-r--r-- | 70.1 KB |
| README | -rw-r--r-- | 727 bytes |
| README.md | -rw-r--r-- | 2.4 KB |
| SECURITY.md | -rw-r--r-- | 283 bytes |
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