diff options
Diffstat (limited to 'kernel/kcsan')
| -rw-r--r-- | kernel/kcsan/Makefile | 1 | ||||
| -rw-r--r-- | kernel/kcsan/core.c | 50 | ||||
| -rw-r--r-- | kernel/kcsan/selftest.c | 12 |
3 files changed, 53 insertions, 10 deletions
diff --git a/kernel/kcsan/Makefile b/kernel/kcsan/Makefile index 4f35d1bced6a..8cf70f068d92 100644 --- a/kernel/kcsan/Makefile +++ b/kernel/kcsan/Makefile @@ -17,4 +17,5 @@ KCSAN_INSTRUMENT_BARRIERS_selftest.o := y obj-$(CONFIG_KCSAN_SELFTEST) += selftest.o CFLAGS_kcsan_test.o := $(CFLAGS_KCSAN) -g -fno-omit-frame-pointer +CFLAGS_kcsan_test.o += $(DISABLE_STRUCTLEAK_PLUGIN) obj-$(CONFIG_KCSAN_KUNIT_TEST) += kcsan_test.o diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index fe12dfe254ec..54d077e1a2dc 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -14,10 +14,12 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/list.h> +#include <linux/minmax.h> #include <linux/moduleparam.h> #include <linux/percpu.h> #include <linux/preempt.h> #include <linux/sched.h> +#include <linux/string.h> #include <linux/uaccess.h> #include "encoding.h" @@ -1308,3 +1310,51 @@ noinline void __tsan_atomic_signal_fence(int memorder) } } EXPORT_SYMBOL(__tsan_atomic_signal_fence); + +#ifdef __HAVE_ARCH_MEMSET +void *__tsan_memset(void *s, int c, size_t count); +noinline void *__tsan_memset(void *s, int c, size_t count) +{ + /* + * Instead of not setting up watchpoints where accessed size is greater + * than MAX_ENCODABLE_SIZE, truncate checked size to MAX_ENCODABLE_SIZE. + */ + size_t check_len = min_t(size_t, count, MAX_ENCODABLE_SIZE); + + check_access(s, check_len, KCSAN_ACCESS_WRITE, _RET_IP_); + return memset(s, c, count); +} +#else +void *__tsan_memset(void *s, int c, size_t count) __alias(memset); +#endif +EXPORT_SYMBOL(__tsan_memset); + +#ifdef __HAVE_ARCH_MEMMOVE +void *__tsan_memmove(void *dst, const void *src, size_t len); +noinline void *__tsan_memmove(void *dst, const void *src, size_t len) +{ + size_t check_len = min_t(size_t, len, MAX_ENCODABLE_SIZE); + + check_access(dst, check_len, KCSAN_ACCESS_WRITE, _RET_IP_); + check_access(src, check_len, 0, _RET_IP_); + return memmove(dst, src, len); +} +#else +void *__tsan_memmove(void *dst, const void *src, size_t len) __alias(memmove); +#endif +EXPORT_SYMBOL(__tsan_memmove); + +#ifdef __HAVE_ARCH_MEMCPY +void *__tsan_memcpy(void *dst, const void *src, size_t len); +noinline void *__tsan_memcpy(void *dst, const void *src, size_t len) +{ + size_t check_len = min_t(size_t, len, MAX_ENCODABLE_SIZE); + + check_access(dst, check_len, KCSAN_ACCESS_WRITE, _RET_IP_); + check_access(src, check_len, 0, _RET_IP_); + return memcpy(dst, src, len); +} +#else +void *__tsan_memcpy(void *dst, const void *src, size_t len) __alias(memcpy); +#endif +EXPORT_SYMBOL(__tsan_memcpy); diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c index 00cdf8fa5693..8679322450f2 100644 --- a/kernel/kcsan/selftest.c +++ b/kernel/kcsan/selftest.c @@ -22,13 +22,6 @@ #define ITERS_PER_TEST 2000 -/* Test requirements. */ -static bool __init test_requires(void) -{ - /* random should be initialized for the below tests */ - return get_random_u32() + get_random_u32() != 0; -} - /* * Test watchpoint encode and decode: check that encoding some access's info, * and then subsequent decode preserves the access's info. @@ -38,8 +31,8 @@ static bool __init test_encode_decode(void) int i; for (i = 0; i < ITERS_PER_TEST; ++i) { - size_t size = prandom_u32_max(MAX_ENCODABLE_SIZE) + 1; - bool is_write = !!prandom_u32_max(2); + size_t size = get_random_u32_inclusive(1, MAX_ENCODABLE_SIZE); + bool is_write = !!get_random_u32_below(2); unsigned long verif_masked_addr; long encoded_watchpoint; bool verif_is_write; @@ -259,7 +252,6 @@ static int __init kcsan_selftest(void) pr_err("selftest: " #do_test " failed"); \ } while (0) - RUN_TEST(test_requires); RUN_TEST(test_encode_decode); RUN_TEST(test_matching_access); RUN_TEST(test_barrier); |