From: Nathan Chancellor <natechancellor@gmail.com>
To: ndesaulniers@google.com
Cc: jejb@linux.vnet.ibm.com, dhowells@redhat.com,
ebiggers@google.com, Mimi Zohar <zohar@linux.vnet.ibm.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KEYS: trusted: fix -Wvarags warning
Date: Thu, 11 Oct 2018 18:50:22 -0700 [thread overview]
Message-ID: <20181012015022.GA7508@flashbox> (raw)
In-Reply-To: <20181011203126.15338-1-ndesaulniers@google.com>
On Thu, Oct 11, 2018 at 01:31:26PM -0700, ndesaulniers@google.com 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@linux.vnet.ibm.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> 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.
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
>
next prev parent reply other threads:[~2018-10-12 1:50 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-09 22:11 undefined behavior (-Wvarargs) in security/keys/trusted.c#TSS_authhmac() Nick Desaulniers
2018-10-11 16:02 ` Arnd Bergmann
2018-10-11 16:10 ` James Bottomley
2018-10-11 20:31 ` [PATCH] KEYS: trusted: fix -Wvarags warning ndesaulniers
2018-10-12 1:50 ` Nathan Chancellor [this message]
2018-10-12 16:55 ` Nick Desaulniers
2018-10-12 17:03 ` Nathan Chancellor
2018-10-12 12:29 ` Denis Kenzior
2018-10-12 15:05 ` James Bottomley
2018-10-12 15:13 ` Denis Kenzior
2018-10-12 15:22 ` James Bottomley
2018-10-12 15:44 ` Denis Kenzior
2018-10-12 15:46 ` James Bottomley
2018-10-12 15:53 ` Denis Kenzior
2018-10-12 16:01 ` James Bottomley
2018-10-12 17:14 ` Nick Desaulniers
2018-10-12 15:25 ` James Bottomley
2018-10-12 17:05 ` Nick Desaulniers
2018-10-12 17:17 ` Nick Desaulniers
2018-10-12 17:27 ` Denis Kenzior
2018-10-12 18:39 ` Nick Desaulniers
2018-10-12 17:02 ` Nick Desaulniers
2018-10-12 17:15 ` Denis Kenzior
2018-10-15 9:26 ` David Laight
2018-10-15 21:53 ` Nick Desaulniers
2018-10-16 8:13 ` David Laight
2018-10-22 23:43 ` [PATCH v2] " ndesaulniers
2018-10-23 0:00 ` Nathan Chancellor
2018-10-24 8:36 ` Jarkko Sakkinen
2018-10-29 17:54 ` Nick Desaulniers
2019-02-11 18:36 ` Nick Desaulniers
2019-02-12 23:12 ` Jarkko Sakkinen
2019-02-14 10:52 ` Jarkko Sakkinen
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