diff options
Diffstat (limited to 'kernel/kcsan')
| -rw-r--r-- | kernel/kcsan/core.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index 916060913966..fe12dfe254ec 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -412,11 +412,20 @@ set_reorder_access(struct kcsan_ctx *ctx, const volatile void *ptr, size_t size, if (!reorder_access || !kcsan_weak_memory) return; + /* + * To avoid nested interrupts or scheduler (which share kcsan_ctx) + * reading an inconsistent reorder_access, ensure that the below has + * exclusive access to reorder_access by disallowing concurrent use. + */ + ctx->disable_scoped++; + barrier(); reorder_access->ptr = ptr; reorder_access->size = size; reorder_access->type = type | KCSAN_ACCESS_SCOPED; reorder_access->ip = ip; reorder_access->stack_depth = get_kcsan_stack_depth(); + barrier(); + ctx->disable_scoped--; } /* |