diff options
Diffstat (limited to 'kernel/kcsan/core.c')
| -rw-r--r-- | kernel/kcsan/core.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index 4c8b40b14314..95a364e22aab 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -283,11 +283,15 @@ static __always_inline bool kcsan_is_enabled(void) return READ_ONCE(kcsan_enabled) && get_ctx()->disable_count == 0; } -static inline unsigned int get_delay(void) +static inline unsigned int get_delay(int type) { unsigned int delay = in_task() ? kcsan_udelay_task : kcsan_udelay_interrupt; + /* For certain access types, skew the random delay to be longer. */ + unsigned int skew_delay_order = + (type & (KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_ASSERT)) ? 1 : 0; + return delay - (IS_ENABLED(CONFIG_KCSAN_DELAY_RANDOMIZE) ? - prandom_u32_max(delay) : + prandom_u32_max(delay >> skew_delay_order) : 0); } @@ -470,7 +474,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type) * Delay this thread, to increase probability of observing a racy * conflicting access. */ - udelay(get_delay()); + udelay(get_delay(type)); /* * Re-read value, and check if it is as expected; if not, we infer a |