956cc1e70c
atomic_t variables are currently used to implement reference counters with the following properties: - counter is initialized to 1 using atomic_set() - a resource is freed upon counter reaching zero - once counter reaches zero, its further increments aren't allowed - counter schema uses basic atomic operations (set, inc, inc_not_zero, dec_and_test, etc.) Such atomic variables should be converted to a newly provided refcount_t type and API that prevents accidental counter overflows and underflows. This is important since overflows and underflows can lead to use-after-free situation and be exploitable. The variable sixpack.refcnt is used as pure reference counter. Convert it to refcount_t and fix up the operations. Suggested-by: Kees Cook <keescook@chromium.org> Reviewed-by: David Windsor <dwindsor@gmail.com> Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|---|---|---|
| .. | ||
| 6pack.c | ||
| Kconfig | ||
| Makefile | ||
| baycom_epp.c | ||
| baycom_par.c | ||
| baycom_ser_fdx.c | ||
| baycom_ser_hdx.c | ||
| bpqether.c | ||
| dmascc.c | ||
| hdlcdrv.c | ||
| mkiss.c | ||
| scc.c | ||
| yam.c | ||
| z8530.h | ||