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io_uring/rsrc: Annotate struct io_mapped_ubuf with __counted_by

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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 io_mapped_ubuf.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: io-uring@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817212146.never.853-kees@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kees Cook 2023-08-17 14:21:47 -07:00 committed by Jens Axboe
parent ebdfefc09c
commit 04d9244c94
1 changed files with 1 additions and 1 deletions
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2
io_uring/rsrc.h
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@ -54,7 +54,7 @@ struct io_mapped_ubuf {
u64 ubuf_end;
unsigned int nr_bvecs;
unsigned long acct_pages;
struct bio_vec bvec[];
struct bio_vec bvec[] __counted_by(nr_bvecs);
};
void io_rsrc_node_ref_zero(struct io_rsrc_node *node);