| From e2cffb5f493a8b431dc87124388ea59b79f0bccb Mon Sep 17 00:00:00 2001 |
| From: Ondrej Kozina <okozina@redhat.com> |
| Date: Mon, 25 Aug 2014 11:49:54 +0200 |
| Subject: crypto: algif - avoid excessive use of socket buffer in skcipher |
| |
| From: Ondrej Kozina <okozina@redhat.com> |
| |
| commit e2cffb5f493a8b431dc87124388ea59b79f0bccb upstream. |
| |
| 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> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| crypto/algif_skcipher.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/crypto/algif_skcipher.c |
| +++ b/crypto/algif_skcipher.c |
| @@ -49,7 +49,7 @@ struct skcipher_ctx { |
| struct ablkcipher_request req; |
| }; |
| |
| -#define MAX_SGL_ENTS ((PAGE_SIZE - sizeof(struct skcipher_sg_list)) / \ |
| +#define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \ |
| sizeof(struct scatterlist) - 1) |
| |
| static inline int skcipher_sndbuf(struct sock *sk) |
