From 788a0bbc70115d2964d1b708720b30fd9f91b6ae Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Fri, 2 Dec 2016 16:35:07 +0100 Subject: [PATCH] libceph: rename and align ceph_x_authorizer::reply_buf commit 7882a26d2e2e520099e2961d5e2e870f8e4172dc upstream. It's going to be used as a temporary buffer for in-place en/decryption with ceph_crypt() instead of on-stack buffers, so rename to enc_buf. Ensure alignment to avoid GFP_ATOMIC allocations in the crypto stack. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil Signed-off-by: Greg Kroah-Hartman --- net/ceph/auth_x.c | 10 +++++----- net/ceph/auth_x.h | 3 ++- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c index de30c58..ef14232 100644 --- a/net/ceph/auth_x.c +++ b/net/ceph/auth_x.c @@ -603,8 +603,8 @@ static int ceph_x_create_authorizer( auth->authorizer = (struct ceph_authorizer *) au; auth->authorizer_buf = au->buf->vec.iov_base; auth->authorizer_buf_len = au->buf->vec.iov_len; - auth->authorizer_reply_buf = au->reply_buf; - auth->authorizer_reply_buf_len = sizeof (au->reply_buf); + auth->authorizer_reply_buf = au->enc_buf; + auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; auth->sign_message = ac->ops->sign_message; auth->check_message_signature = ac->ops->check_message_signature; @@ -638,10 +638,10 @@ static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, int ret = 0; struct ceph_x_authorize_reply reply; void *preply = &reply; - void *p = au->reply_buf; - void *end = p + sizeof(au->reply_buf); + void *p = au->enc_buf; - ret = ceph_x_decrypt(&au->session_key, &p, end, &preply, sizeof(reply)); + ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN, + &preply, sizeof(reply)); if (ret < 0) return ret; if (ret != sizeof(reply)) diff --git a/net/ceph/auth_x.h b/net/ceph/auth_x.h index 21a5af9..48e9ad4 100644 --- a/net/ceph/auth_x.h +++ b/net/ceph/auth_x.h @@ -24,6 +24,7 @@ struct ceph_x_ticket_handler { unsigned long renew_after, expires; }; +#define CEPHX_AU_ENC_BUF_LEN 128 /* big enough for encrypted blob */ struct ceph_x_authorizer { struct ceph_authorizer base; @@ -32,7 +33,7 @@ struct ceph_x_authorizer { unsigned int service; u64 nonce; u64 secret_id; - char reply_buf[128]; /* big enough for encrypted blob */ + char enc_buf[CEPHX_AU_ENC_BUF_LEN] __aligned(8); }; struct ceph_x_info { -- 2.7.4