Messages in this thread Patch in this message | | | Subject | [PATCH] Fix Crypto digest.c kmapping sg entries > page in length | From | Clay Haapala <> | Date | Mon, 07 Jun 2004 15:43:27 -0500 |
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Below is the patch, against 2.6.7-rc2, to fix crypto/digest.c to do multiple kmap()/kunmap() for scatterlist entries which have a size greater than a single page, originally found and fixed by N.C.Krishna Murthy <krmurthy@cisco.com>. -- Clay Haapala (chaapala@cisco.com) Cisco Systems SRBU +1 763-398-1056 6450 Wedgwood Rd, Suite 130 Maple Grove MN 55311 PGP: C89240AD "We're serious about this campaign now! The training wheels are coming off!" - a high White Horse Souse
Signed-off-by: Clay Haapala <chaapala@cisco.com>
diff -uNr --exclude=SCCS --exclude '*.mod.c' --exclude='*.o' --exclude='*.ko' --exclude '.*' linux-2.6.6-bk.orig/crypto/digest.c linux-2.6.6-bk/crypto/digest.c --- linux-2.6.6-bk.orig/crypto/digest.c 2004-06-07 10:58:36.000000000 -0500 +++ linux-2.6.6-bk/crypto/digest.c 2004-06-07 15:21:05.000000000 -0500 @@ -27,13 +27,28 @@ struct scatterlist *sg, unsigned int nsg) { unsigned int i; - + for (i = 0; i < nsg; i++) { - char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset; - tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm), - p, sg[i].length); - crypto_kunmap(p, 0); - crypto_yield(tfm); + + struct page *pg = sg[i].page; + unsigned int offset = sg[i].offset; + unsigned int l = sg[i].length; + + do { + unsigned int bytes_from_page = min(l, ((unsigned int) + (PAGE_SIZE)) - + offset); + char *p = crypto_kmap(pg, 0) + offset; + + tfm->__crt_alg->cra_digest.dia_update + (crypto_tfm_ctx(tfm), p, + bytes_from_page); + crypto_kunmap(p, 0); + crypto_yield(tfm); + offset = 0; + pg++; + l -= bytes_from_page; + } while (l > 0); } } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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