On Tue, Nov 21, 2023 at 12:52:44PM -0600, Gustavo A. R. Silva wrote:
> The compiler doesn't know that `32` is an offset into the Hash table:
>
> 56 struct Hash_ctx {
> 57 u8 H[16]; /* subkey */
> 58 u8 Htable[256]; /* Xi, Hash table(offset 32) */
> 59 };
>
> So, it legitimately complains about a potential out-of-bounds issue
> if `256 bytes` are accessed in `htable` (this implies going
> `32 bytes` beyond the boundaries of `Htable`):
>
> arch/powerpc/crypto/aes-gcm-p10-glue.c: In function 'gcmp10_init':
> arch/powerpc/crypto/aes-gcm-p10-glue.c:120:9: error: 'gcm_init_htable' accessing 256 bytes in a region of size 224 [-Werror=stringop-overflow=]
> 120 | gcm_init_htable(hash->Htable+32, hash->H);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/crypto/aes-gcm-p10-glue.c:120:9: note: referencing argument 1 of type 'unsigned char[256]'
> arch/powerpc/crypto/aes-gcm-p10-glue.c:120:9: note: referencing argument 2 of type 'unsigned char[16]'
> arch/powerpc/crypto/aes-gcm-p10-glue.c:40:17: note: in a call to function 'gcm_init_htable'
> 40 | asmlinkage void gcm_init_htable(unsigned char htable[256], unsigned char Xi[16]);
> | ^~~~~~~~~~~~~~~
>
> Address this by avoiding specifying the size of `htable` in the function
> prototype; and just for consistency, do the same for parameter `Xi`.
>
> Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> Closes: https://lore.kernel.org/linux-next/20231121131903.68a37932@xxxxxxxxxxxxxxxx/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
> ---
> arch/powerpc/crypto/aes-gcm-p10-glue.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Patch applied. Thanks.
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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