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2014-09-04crypto: algif - avoid excessive use of socket buffer in skcipherOndrej Kozina1-1/+1
On archs with PAGE_SIZE >= 64 KiB the function skcipher_alloc_sgl() fails with -ENOMEM no matter what user space actually requested. This is caused by the fact sock_kmalloc call inside the function tried to allocate more memory than allowed by the default kernel socket buffer size (kernel param net.core.optmem_max). Signed-off-by: Ondrej Kozina <okozina@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2013-11-30net: update consumers of MSG_MORE to recognize MSG_SENDPAGE_NOTLASTShawn Landden1-0/+3
Commit 35f9c09fe (tcp: tcp_sendpages() should call tcp_push() once) added an internal flag MSG_SENDPAGE_NOTLAST, similar to MSG_MORE. algif_hash, algif_skcipher, and udp used MSG_MORE from tcp_sendpages() and need to see the new flag as identical to MSG_MORE. This fixes sendfile() on AF_ALG. v3: also fix udp Cc: Tom Herbert <therbert@google.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: <stable@vger.kernel.org> # 3.4.x + 3.2.x Reported-and-tested-by: Shawn Landden <shawnlandden@gmail.com> Original-patch: Richard Weinberger <richard@nod.at> Signed-off-by: Shawn Landden <shawn@churchofgit.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-11-21net: rework recvmsg handler msg_name and msg_namelen logicHannes Frederic Sowa1-1/+0
This patch now always passes msg->msg_namelen as 0. recvmsg handlers must set msg_namelen to the proper size <= sizeof(struct sockaddr_storage) to return msg_name to the user. This prevents numerous uninitialized memory leaks we had in the recvmsg handlers and makes it harder for new code to accidentally leak uninitialized memory. Optimize for the case recvfrom is called with NULL as address. We don't need to copy the address at all, so set it to NULL before invoking the recvmsg handler. We can do so, because all the recvmsg handlers must cope with the case a plain read() is called on them. read() also sets msg_name to NULL. Also document these changes in include/linux/net.h as suggested by David Miller. Changes since RFC: Set msg->msg_name = NULL if user specified a NULL in msg_name but had a non-null msg_namelen in verify_iovec/verify_compat_iovec. This doesn't affect sendto as it would bail out earlier while trying to copy-in the address. It also more naturally reflects the logic by the callers of verify_iovec. With this change in place I could remove " if (!uaddr || msg_sys->msg_namelen == 0) msg->msg_name = NULL ". This change does not alter the user visible error logic as we ignore msg_namelen as long as msg_name is NULL. Also remove two unnecessary curly brackets in ___sys_recvmsg and change comments to netdev style. Cc: David Miller <davem@davemloft.net> Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-10crypto: algif - suppress sending source address information in recvmsgMathias Krause1-0/+1
The current code does not set the msg_namelen member to 0 and therefore makes net/socket.c leak the local sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Fix that. Cc: <stable@vger.kernel.org> # 2.6.38 Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2010-11-30crypto: algif_skcipher - Handle unaligned receive bufferHerbert Xu1-6/+7
As it is if user-space passes through a receive buffer that's not aligned to to the cipher block size, we'll end up encrypting or decrypting a partial block which causes a spurious EINVAL to be returned. This patch fixes this by moving the partial block test after the af_alg_make_sg call. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2010-11-30crypto: algif_skcipher - Fixed overflow when sndbuf is page alignedHerbert Xu1-21/+11
When sk_sndbuf is not a multiple of PAGE_SIZE, the limit tests in sendmsg fail as the limit variable becomes negative and we're using an unsigned comparison. The same thing can happen if sk_sndbuf is lowered after a sendmsg call. This patch fixes this by always taking the signed maximum of limit and 0 before we perform the comparison. It also rounds the value of sk_sndbuf down to a multiple of PAGE_SIZE so that we don't end up allocating a page only to use a small number of bytes in it because we're bound by sk_sndbuf. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2010-11-28crypto: algif_skcipher - Pass on error from af_alg_make_sgHerbert Xu1-1/+2
The error returned from af_alg_make_sg is currently lost and we always pass on -EINVAL. This patch pases on the underlying error. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2010-11-26crypto: algif_skcipher - User-space interface for skcipher operationsHerbert Xu1-0/+640
This patch adds the af_alg plugin for symmetric key ciphers, corresponding to the ablkcipher kernel operation type. Keys can optionally be set through the setsockopt interface. Once a sendmsg call occurs without MSG_MORE no further writes may be made to the socket until all previous data has been read. IVs and and whether encryption/decryption is performed can be set through the setsockopt interface or as a control message to sendmsg. The interface is completely synchronous, all operations are carried out in recvmsg(2) and will complete prior to the system call returning. The splice(2) interface support reading the user-space data directly without copying (except that the Crypto API itself may copy the data if alignment is off). The recvmsg(2) interface supports directly writing to user-space without additional copying, i.e., the kernel crypto interface will receive the user-space address as its output SG list. Thakns to Miloslav Trmac for reviewing this and contributing fixes and improvements. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: David S. Miller <davem@davemloft.net>