Em Tue, Feb 21, 2017 at 05:35:00PM +0200, Elena Reshetova escreveu:
> refcount_t type and corresponding API should be
> used instead of atomic_t when the variable is used as
> a reference counter. This allows to avoid accidental
> refcounter overflows that might lead to use-after-free
> situations.
You missed tools/perf/tests/thread-mg-share.c
I fixed it up.
> Signed-off-by: Elena Reshetova <elena.reshetova@xxxxxxxxx>
> Signed-off-by: Hans Liljestrand <ishkamiel@xxxxxxxxx>
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Signed-off-by: David Windsor <dwindsor@xxxxxxxxx>
> ---
> tools/perf/util/map.c | 4 ++--
> tools/perf/util/map.h | 4 ++--
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index f0e2428..1d9ebcf 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -485,7 +485,7 @@ void map_groups__init(struct map_groups *mg, struct machine *machine)
> maps__init(&mg->maps[i]);
> }
> mg->machine = machine;
> - atomic_set(&mg->refcnt, 1);
> + refcount_set(&mg->refcnt, 1);
> }
>
> static void __maps__purge(struct maps *maps)
> @@ -547,7 +547,7 @@ void map_groups__delete(struct map_groups *mg)
>
> void map_groups__put(struct map_groups *mg)
> {
> - if (mg && atomic_dec_and_test(&mg->refcnt))
> + if (mg && refcount_dec_and_test(&mg->refcnt))
> map_groups__delete(mg);
> }
>
> diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> index 9545ff3..c8a5a64 100644
> --- a/tools/perf/util/map.h
> +++ b/tools/perf/util/map.h
> @@ -67,7 +67,7 @@ struct maps {
> struct map_groups {
> struct maps maps[MAP__NR_TYPES];
> struct machine *machine;
> - atomic_t refcnt;
> + refcount_t refcnt;
> };
>
> struct map_groups *map_groups__new(struct machine *machine);
> @@ -77,7 +77,7 @@ bool map_groups__empty(struct map_groups *mg);
> static inline struct map_groups *map_groups__get(struct map_groups *mg)
> {
> if (mg)
> - atomic_inc(&mg->refcnt);
> + refcount_inc(&mg->refcnt);
> return mg;
> }
>
> --
> 2.7.4
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