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https://github.com/Divested-Mobile/DivestOS-Build.git
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65 lines
2.9 KiB
Diff
65 lines
2.9 KiB
Diff
From a1b9bc540f4af79bd23e01ec08429e0efa4d2f7b Mon Sep 17 00:00:00 2001
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From: Qidan He <i@flanker017.me>
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Date: Thu, 13 Oct 2016 16:27:46 -0700
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Subject: [PATCH] net: ping: Fix stack buffer overflow in ping_common_sendmsg()
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In ping_common_sendmsg(), when len < icmph_len, memcpy_fromiovec()
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will access invalid memory because msg->msg_iov only has 1 element
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and memcpy_fromiovec() attempts to increment it. KASAN report:
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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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Memory state around the buggy address:
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ffffffc071077c80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 f1 f1
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ffffffc071077d00: f1 f1 04 f4 f4 f4 f2 f2 f2 f2 04 f4 f4 f4 f2 f2
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>ffffffc071077d80: f2 f2 00 00 f4 f4 f2 f2 f2 f2 00 00 00 00 00 00
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^
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ffffffc071077e00: 00 f4 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00
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ffffffc071077e80: 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00
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Bug: 31349935
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Change-Id: Ib7385fc26dfe7e07e9bab42a10ff65a37cbaab54
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Signed-off-by: Siqi Lin <siqilin@google.com>
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---
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net/ipv4/ping.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
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index f8c8f60ad7e25..aaa70dd666674 100644
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--- a/net/ipv4/ping.c
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+++ b/net/ipv4/ping.c
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@@ -651,7 +651,7 @@ int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
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void *user_icmph, size_t icmph_len) {
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u8 type, code;
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- if (len > 0xFFFF)
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+ if (len > 0xFFFF || len < icmph_len)
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return -EMSGSIZE;
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/*
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