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72 lines
2.9 KiB
Plaintext
72 lines
2.9 KiB
Plaintext
From 0eab121ef8750a5c8637d51534d5e9143fb0633f Mon Sep 17 00:00:00 2001
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From: Kees Cook <keescook@chromium.org>
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Date: Mon, 5 Dec 2016 10:34:38 -0800
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Subject: net: ping: check minimum size on ICMP header length
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Prior to commit c0371da6047a ("put iov_iter into msghdr") in v3.19, there
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was no check that the iovec contained enough bytes for an ICMP header,
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and the read loop would walk across neighboring stack contents. Since the
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iov_iter conversion, bad arguments are noticed, but the returned error is
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EFAULT. Returning EINVAL is a clearer error and also solves the problem
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prior to v3.19.
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This was found using trinity with KASAN on v3.18:
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BUG: KASAN: stack-out-of-bounds in memcpy_fromiovec+0x60/0x114 at addr ffffffc071077da0
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Read of size 8 by task trinity-c2/9623
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page:ffffffbe034b9a08 count:0 mapcount:0 mapping: (null) index:0x0
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flags: 0x0()
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page dumped because: kasan: bad access detected
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CPU: 0 PID: 9623 Comm: trinity-c2 Tainted: G BU 3.18.0-dirty #15
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Hardware name: Google Tegra210 Smaug Rev 1,3+ (DT)
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Call trace:
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[<ffffffc000209c98>] dump_backtrace+0x0/0x1ac arch/arm64/kernel/traps.c:90
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[<ffffffc000209e54>] show_stack+0x10/0x1c arch/arm64/kernel/traps.c:171
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[< inline >] __dump_stack lib/dump_stack.c:15
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[<ffffffc000f18dc4>] dump_stack+0x7c/0xd0 lib/dump_stack.c:50
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[< inline >] print_address_description mm/kasan/report.c:147
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[< inline >] kasan_report_error mm/kasan/report.c:236
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[<ffffffc000373dcc>] kasan_report+0x380/0x4b8 mm/kasan/report.c:259
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[< inline >] check_memory_region mm/kasan/kasan.c:264
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[<ffffffc00037352c>] __asan_load8+0x20/0x70 mm/kasan/kasan.c:507
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[<ffffffc0005b9624>] memcpy_fromiovec+0x5c/0x114 lib/iovec.c:15
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[< inline >] memcpy_from_msg include/linux/skbuff.h:2667
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[<ffffffc000ddeba0>] ping_common_sendmsg+0x50/0x108 net/ipv4/ping.c:674
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[<ffffffc000dded30>] ping_v4_sendmsg+0xd8/0x698 net/ipv4/ping.c:714
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[<ffffffc000dc91dc>] inet_sendmsg+0xe0/0x12c net/ipv4/af_inet.c:749
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[< inline >] __sock_sendmsg_nosec net/socket.c:624
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[< inline >] __sock_sendmsg net/socket.c:632
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[<ffffffc000cab61c>] sock_sendmsg+0x124/0x164 net/socket.c:643
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[< inline >] SYSC_sendto net/socket.c:1797
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[<ffffffc000cad270>] SyS_sendto+0x178/0x1d8 net/socket.c:1761
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CVE-2016-8399
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Reported-by: Qidan He <i@flanker017.me>
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Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
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Cc: stable@vger.kernel.org
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Signed-off-by: Kees Cook <keescook@chromium.org>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv4/ping.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
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index 205e200..96b8e2b 100644
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--- a/net/ipv4/ping.c
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+++ b/net/ipv4/ping.c
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@@ -657,6 +657,10 @@ int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
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if (len > 0xFFFF)
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return -EMSGSIZE;
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+ /* Must have at least a full ICMP header. */
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+ if (len < icmph_len)
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+ return -EINVAL;
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+
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/*
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* Check the flags.
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*/
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--
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cgit v1.1
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