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usb: gadget: f_fs: Annotate struct ffs_buffer 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 ffs_buffer.

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

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: John Keeping <john@keeping.me.uk>
Cc: Udipto Goswami <quic_ugoswami@quicinc.com>
Cc: Linyu Yuan <quic_linyyuan@quicinc.com>
Cc: linux-usb@vger.kernel.org
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230915195849.never.275-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2023-09-15 12:58:49 -07:00
parent d5ae1c3b97
commit c7c4ac7f47
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/f_fs.c
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@ -202,7 +202,7 @@ struct ffs_epfile {
struct ffs_buffer {
size_t length;
char *data;
char storage[];
char storage[] __counted_by(length);
};
/* ffs_io_data structure ***************************************************/