[PATCH] raw_sendmsg DoS on 2.6 (6d1cfe3f) · Commits · 戴 / test

Fix unchecked __get_user that could be tricked into generating a memory read on an arbitrary address. The result of the read is not returned directly but you may be able to divine some information about it, or use the read to cause a crash on some architectures by reading hardware state. CAN-2004-2492. Fix from Al Viro, ack from Dave Miller. Signed-off-by:

Linus Torvalds <torvalds@osdl.org>

net/ipv4/raw.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -361,7 +361,7 @@ static void raw_probe_proto_opt(struct flowi fl, struct msghdr msg)

		if (type && code) {
		get_user(fl->fl_icmp_type, type);
		__get_user(fl->fl_icmp_code, code);
		get_user(fl->fl_icmp_code, code);
		probed = 1;
		}
		break;

net/ipv6/raw.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -627,7 +627,7 @@ static void rawv6_probe_proto_opt(struct flowi fl, struct msghdr msg)

		if (type && code) {
		get_user(fl->fl_icmp_type, type);
		__get_user(fl->fl_icmp_code, code);
		get_user(fl->fl_icmp_code, code);
		probed = 1;
		}
		break;

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