Structure cmsghdr is copied to userland with padding bytes unitialized on architectures where __kernel_size_t is unsigned long. It leads to leaking of contents of kernel stack memory. Signed-off-by: Vasiliy Kulikov <segooon@xxxxxxxxx> --- Compile tested. net/core/scm.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/net/core/scm.c b/net/core/scm.c index 413cab8..a4a9b70 100644 --- a/net/core/scm.c +++ b/net/core/scm.c @@ -233,6 +233,7 @@ int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data) msg->msg_flags |= MSG_CTRUNC; cmlen = msg->msg_controllen; } + memset(&cmhdr, 0, sizeof(cmhdr)); cmhdr.cmsg_level = level; cmhdr.cmsg_type = type; cmhdr.cmsg_len = cmlen; -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
