On Thu, Oct 11, 2018 at 6:50 PM Nathan Chancellor <natechancellor@xxxxxxxxx> wrote: > > On Thu, Oct 11, 2018 at 01:31:26PM -0700, ndesaulniers@xxxxxxxxxx wrote: > > by swapping h2 and h3. > > > > security/keys/trusted.c:146:17: warning: passing an object that > > undergoes default > > argument promotion to 'va_start' has undefined behavior [-Wvarargs] > > va_start(argp, h3); > > ^ > > security/keys/trusted.c:126:37: note: parameter of type 'unsigned > > char' is declared here > > unsigned char *h2, unsigned char h3, ...) > > ^ > > > > Specifically, it seems that both the C90 (4.8.1.1) and C11 (7.16.1.4) > > standards explicitly call this out as undefined behavior: > > > > The parameter parmN is the identifier of the rightmost parameter in > > the variable parameter list in the function definition (the one just > > before the ...). If the parameter parmN is declared with ... or with a > > type that is not compatible with the type that results after > > application of the default argument promotions, the behavior is > > undefined. > > > > Link: https://github.com/ClangBuiltLinux/linux/issues/41 > > Suggested-by: James Bottomley <jejb@xxxxxxxxxxxxxxxxxx> > > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > > --- > > security/keys/trusted.c | 14 +++++++------- > > 1 file changed, 7 insertions(+), 7 deletions(-) > > > > diff --git a/security/keys/trusted.c b/security/keys/trusted.c > > index b69d3b1777c2..d425b2b839af 100644 > > --- a/security/keys/trusted.c > > +++ b/security/keys/trusted.c > > @@ -123,7 +123,7 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, > > */ > > static int TSS_authhmac(unsigned char *digest, const unsigned char *key, > > unsigned int keylen, unsigned char *h1, > > - unsigned char *h2, unsigned char h3, ...) > > + unsigned char h2, unsigned char *h3, ...) > > Prototype needs to be updated in include/keys/trusted.h and it looks > like this function is used in crypto/asymmetric_keys/asym_tpm.c so these > same changes should be made there. Thanks for the review. Which tree are you looking at? These files don't exist in torvalds/linux, but maybe -next or the crypto tree have expanded the number of call sites of this function? > > Otherwise, looks good to me! Thanks for sending the patch. > > Nathan > > > { > > unsigned char paramdigest[SHA1_DIGEST_SIZE]; > > struct sdesc *sdesc; > > @@ -139,7 +139,7 @@ static int TSS_authhmac(unsigned char *digest, const unsigned char *key, > > return PTR_ERR(sdesc); > > } > > > > - c = h3; > > + c = h2; > > ret = crypto_shash_init(&sdesc->shash); > > if (ret < 0) > > goto out; > > @@ -163,7 +163,7 @@ static int TSS_authhmac(unsigned char *digest, const unsigned char *key, > > if (!ret) > > ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, > > paramdigest, TPM_NONCE_SIZE, h1, > > - TPM_NONCE_SIZE, h2, 1, &c, 0, 0); > > + TPM_NONCE_SIZE, h3, 1, &c, 0, 0); > > out: > > kzfree(sdesc); > > return ret; > > @@ -508,7 +508,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, > > if (pcrinfosize == 0) { > > /* no pcr info specified */ > > ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, > > - sess.enonce, td->nonceodd, cont, > > + sess.enonce, cont, td->nonceodd, > > sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, > > td->encauth, sizeof(uint32_t), &pcrsize, > > sizeof(uint32_t), &datsize, datalen, data, 0, > > @@ -516,7 +516,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, > > } else { > > /* pcr info specified */ > > ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, > > - sess.enonce, td->nonceodd, cont, > > + sess.enonce, cont, td->nonceodd, > > sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, > > td->encauth, sizeof(uint32_t), &pcrsize, > > pcrinfosize, pcrinfo, sizeof(uint32_t), > > @@ -608,12 +608,12 @@ static int tpm_unseal(struct tpm_buf *tb, > > return ret; > > } > > ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, > > - enonce1, nonceodd, cont, sizeof(uint32_t), > > + enonce1, cont, nonceodd, sizeof(uint32_t), > > &ordinal, bloblen, blob, 0, 0); > > if (ret < 0) > > return ret; > > ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, > > - enonce2, nonceodd, cont, sizeof(uint32_t), > > + enonce2, cont, nonceodd, sizeof(uint32_t), > > &ordinal, bloblen, blob, 0, 0); > > if (ret < 0) > > return ret; > > -- > > 2.19.0.605.g01d371f741-goog > > -- Thanks, ~Nick Desaulniers
