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
gup_test.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __GUP_TEST_H
#define __GUP_TEST_H
#include <linux/types.h>
#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_test)
#define PIN_FAST_BENCHMARK _IOWR('g', 2, struct gup_test)
#define PIN_LONGTERM_BENCHMARK _IOWR('g', 3, struct gup_test)
#define GUP_BASIC_TEST _IOWR('g', 4, struct gup_test)
#define PIN_BASIC_TEST _IOWR('g', 5, struct gup_test)
#define DUMP_USER_PAGES_TEST _IOWR('g', 6, struct gup_test)
#define PIN_LONGTERM_TEST_START _IOW('g', 7, struct pin_longterm_test)
#define PIN_LONGTERM_TEST_STOP _IO('g', 8)
#define PIN_LONGTERM_TEST_READ _IOW('g', 9, __u64)
#define GUP_TEST_MAX_PAGES_TO_DUMP 8
#define GUP_TEST_FLAG_DUMP_PAGES_USE_PIN 0x1
struct gup_test {
__u64 get_delta_usec;
__u64 put_delta_usec;
__u64 addr;
__u64 size;
__u32 nr_pages_per_call;
__u32 gup_flags;
__u32 test_flags;
/*
* Each non-zero entry is the number of the page (1-based: first page is
* page 1, so that zero entries mean "do nothing") from the .addr base.
*/
__u32 which_pages[GUP_TEST_MAX_PAGES_TO_DUMP];
};
#define PIN_LONGTERM_TEST_FLAG_USE_WRITE 1
#define PIN_LONGTERM_TEST_FLAG_USE_FAST 2
struct pin_longterm_test {
__u64 addr;
__u64 size;
__u32 flags;
};
#endif /* __GUP_TEST_H */
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