From patchwork Tue Mar 11 10:20:33 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Herbert Xu X-Patchwork-Id: 872611 Received: from abb.hmeau.com (abb.hmeau.com [144.6.53.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B07F44207F for ; Tue, 11 Mar 2025 10:20:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=144.6.53.87 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741688439; cv=none; b=IL5vcqvv7XwKg+UnZuQn93qdIVy0RAH6RUQrUJs7ysibbXF5xH5+ue0IuSPh4JhF66y6gK1usQBzX+Pkk/gcvQ06X4vM4pR+jGcFyvwkOeHWmNEgSe5GX7zqPRx//FAV0lr16sDfAbatgeUWEhJ4+muh5IFl5bvi+F0XZGrBb7I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741688439; c=relaxed/simple; bh=kdURDEdeEy+5KeMNaX8S+HzRkkfI/ZGF3wxYBQdoQ0o=; h=Date:Message-Id:In-Reply-To:References:From:Subject:To; b=kTKvdXVpQzbYedSiqI5tNdJrvAxqr1SiHxp6S+htiKygNzLD+dh3M7+hB7g3HYJvQUoY58GZ+EMJ0isafKpNYkggFVTPhSKjqyWdF3ElmY4FAmQ9yl5Iq4kPzv+vfV18KGaYDkx+VLeHgSZHgrXUj4VXFHJ7eZAxOL+HOZgtob0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gondor.apana.org.au; spf=pass smtp.mailfrom=gondor.apana.org.au; dkim=pass (2048-bit key) header.d=hmeau.com header.i=@hmeau.com header.b=Np4FPyRd; arc=none smtp.client-ip=144.6.53.87 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gondor.apana.org.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gondor.apana.org.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=hmeau.com header.i=@hmeau.com header.b="Np4FPyRd" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hmeau.com; s=formenos; h=To:Subject:From:References:In-Reply-To:Message-Id:Date:Sender: Reply-To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=Q2LLHXzy/ME0OPakJtAPC2GB4Fh3b+rwahOGpRc6qyI=; b=Np4FPyRdsEvkksdFxS0oWvN27a k3ScyboMYksdP12JOjVekWXEZO2i7NC9yZTStVFoqWUFJWVXdxwEY4Q7m9bj/3HCRCq1AD75lkXBg quxch7uLaSHfjUSduhlDY/VNj1+I9MwWNg3X0lZlcIJSVCuEf0mXaxZRlB6oNO6FHkXnif4B+uGYs iQUlsDE7T89StjQIlpn604f4l2/2JKoOwhl6e8jm6dtsCeVysuS0RmS7L2zS0yWU8PDDzMY8REE1F 9bf0Dm+SS5oidIk0NPkfszqp92OkkWdYFpo1Iicqd5oiMi1Y49Frvfami+2xqDqQtvdA/dJCJaU7I fj3HcOOA==; Received: from loth.rohan.me.apana.org.au ([192.168.167.2]) by formenos.hmeau.com with smtp (Exim 4.96 #2 (Debian)) id 1trwiv-005YUy-2o; Tue, 11 Mar 2025 18:20:34 +0800 Received: by loth.rohan.me.apana.org.au (sSMTP sendmail emulation); Tue, 11 Mar 2025 18:20:33 +0800 Date: Tue, 11 Mar 2025 18:20:33 +0800 Message-Id: <916cf41713840b1a9eae230e3001a31d488bdcba.1741688305.git.herbert@gondor.apana.org.au> In-Reply-To: References: From: Herbert Xu Subject: [PATCH 3/3] crypto: krb5 - Use SG miter instead of doing it by hand To: Linux Crypto Mailing List Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The function crypto_shash_update_sg iterates through an SG by hand. It fails to handle corner cases such as SG entries longer than a page. Fix this by using the SG iterator. Fixes: 348f5669d1f6 ("crypto/krb5: Implement the Kerberos5 rfc3961 get_mic and verify_mic") Signed-off-by: Herbert Xu --- crypto/krb5/rfc3961_simplified.c | 34 ++++++++++++++------------------ 1 file changed, 15 insertions(+), 19 deletions(-) diff --git a/crypto/krb5/rfc3961_simplified.c b/crypto/krb5/rfc3961_simplified.c index c1dcb0dd3a00..d9cf1bfa11a5 100644 --- a/crypto/krb5/rfc3961_simplified.c +++ b/crypto/krb5/rfc3961_simplified.c @@ -67,6 +67,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include +#include #include #include #include @@ -83,26 +84,21 @@ int crypto_shash_update_sg(struct shash_desc *desc, struct scatterlist *sg, size_t offset, size_t len) { - do { - int ret; + struct sg_mapping_iter miter; + size_t i, n; + int ret; - if (offset < sg->length) { - struct page *page = sg_page(sg); - void *p = kmap_local_page(page); - void *q = p + sg->offset + offset; - size_t seg = min_t(size_t, len, sg->length - offset); - - ret = crypto_shash_update(desc, q, seg); - kunmap_local(p); - if (ret < 0) - return ret; - len -= seg; - offset = 0; - } else { - offset -= sg->length; - } - } while (len > 0 && (sg = sg_next(sg))); - return 0; + sg_miter_start(&miter, sg, sg_nents(sg), + SG_MITER_FROM_SG | SG_MITER_ATOMIC); + for (i = 0; i < len; i += n) { + sg_miter_next(&miter); + n = min(miter.length, len - i); + ret = crypto_shash_update(desc, miter.addr, n); + if (ret < 0) + break; + } + sg_miter_stop(&miter); + return ret; } static int rfc3961_do_encrypt(struct crypto_sync_skcipher *tfm, void *iv,