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authorIlya Dryomov <idryomov@gmail.com>2016-12-02 18:35:07 +0300
committerIlya Dryomov <idryomov@gmail.com>2016-12-13 01:09:19 +0300
commit7882a26d2e2e520099e2961d5e2e870f8e4172dc (patch)
treebe084fd64e02745bf8ab5de2c697517467a11c34
parenta45f795c65b479b4ba107b6ccde29b896d51ee98 (diff)
downloadlinux-7882a26d2e2e520099e2961d5e2e870f8e4172dc.tar.xz
libceph: rename and align ceph_x_authorizer::reply_buf
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 <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
-rw-r--r--net/ceph/auth_x.c10
-rw-r--r--net/ceph/auth_x.h3
2 files changed, 7 insertions, 6 deletions
diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c
index de30c585c2a2..ef1423294517 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 21a5af904bae..48e9ad41bd2a 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 {