On Mon, Jul 24, 2023 at 03:53:01PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@xxxxxxxx> > > Some configurations with gcc-12 or gcc-13 produce a warning for the source > and destination of a memcpy() in atmel_sha_hmac_compute_ipad_hash() potentially > overlapping: > > In file included from include/linux/string.h:254, > from drivers/crypto/atmel-sha.c:15: > drivers/crypto/atmel-sha.c: In function 'atmel_sha_hmac_compute_ipad_hash': > include/linux/fortify-string.h:57:33: error: '__builtin_memcpy' accessing 129 or more bytes at offsets 408 and 280 overlaps 1 or more bytes at offset 408 [-Werror=restrict] > 57 | #define __underlying_memcpy __builtin_memcpy > | ^ > include/linux/fortify-string.h:648:9: note: in expansion of macro '__underlying_memcpy' > 648 | __underlying_##op(p, q, __fortify_size); \ > | ^~~~~~~~~~~~~ > include/linux/fortify-string.h:693:26: note: in expansion of macro '__fortify_memcpy_chk' > 693 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \ > | ^~~~~~~~~~~~~~~~~~~~ > drivers/crypto/atmel-sha.c:1773:9: note: in expansion of macro 'memcpy' > 1773 | memcpy(hmac->opad, hmac->ipad, bs); > | ^~~~~~ > > The same thing happens in two more drivers that have the same logic: Please send me the configurations which triggers these warnings. As these are false positives, I'd like to enable them only on the configurations where they actually cause a problem. Thanks, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
