The network layer tries to allocate high order pages for skb_buff fragments, this leads to problems if we pass such a buffer to crypto because crypto assumes to have always order null pages in the scatterlists. This was not a problem so far, because the network stack linearized all buffers before passing them to crypto. If we try to avoid the linearization with skb_cow_data in IPsec esp4/esp6 this incompatibility becomes visible. Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> --- Herbert, I could not find out why this PAGE_SIZE limit is in place. So not sure if this is the right fix. Also, would it be ok to merge this, or whatever is the right fix through the IPsec tree? We need this before we can change esp to avoid linearization. The full IPsec patchset can be found here: https://git.kernel.org/cgit/linux/kernel/git/klassert/linux-stk.git/log/?h=net-next-ipsec-offload-work crypto/ahash.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/crypto/ahash.c b/crypto/ahash.c index 5fc1f17..ca92783 100644 --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -44,8 +44,7 @@ static int hash_walk_next(struct crypto_hash_walk *walk) { unsigned int alignmask = walk->alignmask; unsigned int offset = walk->offset; - unsigned int nbytes = min(walk->entrylen, - ((unsigned int)(PAGE_SIZE)) - offset); + unsigned int nbytes = walk->entrylen; if (walk->flags & CRYPTO_ALG_ASYNC) walk->data = kmap(walk->pg); @@ -91,8 +90,6 @@ int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) walk->offset = ALIGN(walk->offset, alignmask + 1); walk->data += walk->offset; - nbytes = min(nbytes, - ((unsigned int)(PAGE_SIZE)) - walk->offset); walk->entrylen -= nbytes; return nbytes; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
