Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct ib_pkey_cache.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: "HÃ¥kon Bugge" <haakon.bugge@oracle.com>
Cc: Avihai Horon <avihaih@nvidia.com>
Cc: Anand Khoje <anand.a.khoje@oracle.com>
Cc: Mark Bloch <mbloch@nvidia.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230929180431.3005464-2-keescook@chromium.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
struct ib_pkey_cache {
int table_len;
- u16 table[];
+ u16 table[] __counted_by(table_len);
};
struct ib_update_work {