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Message-Id: <1288448796-6147-1-git-send-email-segooon@gmail.com> Date: Sat, 30 Oct 2010 18:26:35 +0400 From: Vasiliy Kulikov <segooon@...il.com> To: kernel-janitors@...r.kernel.org Cc: "David S. Miller" <davem@...emloft.net>, "Eric W. Biederman" <ebiederm@...ssion.com>, Eric Dumazet <eric.dumazet@...il.com>, Tejun Heo <tj@...nel.org>, "Serge E. Hallyn" <serge@...lyn.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] net: core: scm: fix information leak to userland 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@...il.com> --- 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 netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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