diff options
| author | Marco Elver <elver@google.com> | 2021-08-09 14:25:13 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-09-14 02:41:19 +0300 |
| commit | f4c87dbbef2638f6da6e29b5e998e3b1dcdb08ee (patch) | |
| tree | 503e52d978b3897ceef9f5390ab5dccf0d256933 /kernel/kcsan | |
| parent | 55a55fec5015b326235873b925a5882ac56ecaa2 (diff) | |
| download | linux-f4c87dbbef2638f6da6e29b5e998e3b1dcdb08ee.tar.xz | |
kcsan: Save instruction pointer for scoped accesses
Save the instruction pointer for scoped accesses, so that it becomes
possible for the reporting code to construct more accurate stack traces
that will show the start of the scope.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/kcsan')
| -rw-r--r-- | kernel/kcsan/core.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index bffd1d95addb..8b20af541776 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -202,6 +202,9 @@ static __always_inline struct kcsan_ctx *get_ctx(void) return in_task() ? ¤t->kcsan_ctx : raw_cpu_ptr(&kcsan_cpu_ctx); } +static __always_inline void +check_access(const volatile void *ptr, size_t size, int type, unsigned long ip); + /* Check scoped accesses; never inline because this is a slow-path! */ static noinline void kcsan_check_scoped_accesses(void) { @@ -210,8 +213,10 @@ static noinline void kcsan_check_scoped_accesses(void) struct kcsan_scoped_access *scoped_access; ctx->scoped_accesses.prev = NULL; /* Avoid recursion. */ - list_for_each_entry(scoped_access, &ctx->scoped_accesses, list) - __kcsan_check_access(scoped_access->ptr, scoped_access->size, scoped_access->type); + list_for_each_entry(scoped_access, &ctx->scoped_accesses, list) { + check_access(scoped_access->ptr, scoped_access->size, + scoped_access->type, scoped_access->ip); + } ctx->scoped_accesses.prev = prev_save; } @@ -767,6 +772,7 @@ kcsan_begin_scoped_access(const volatile void *ptr, size_t size, int type, sa->ptr = ptr; sa->size = size; sa->type = type; + sa->ip = _RET_IP_; if (!ctx->scoped_accesses.prev) /* Lazy initialize list head. */ INIT_LIST_HEAD(&ctx->scoped_accesses); @@ -798,7 +804,7 @@ void kcsan_end_scoped_access(struct kcsan_scoped_access *sa) ctx->disable_count--; - __kcsan_check_access(sa->ptr, sa->size, sa->type); + check_access(sa->ptr, sa->size, sa->type, sa->ip); } EXPORT_SYMBOL(kcsan_end_scoped_access); |