lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAF=yD-KcnV=89eE1Y2Cx4nXUrazHP7MsuirMZKAKfq1n62b=fw@mail.gmail.com> Date: Wed, 23 Jan 2019 16:33:24 -0500 From: Willem de Bruijn <willemdebruijn.kernel@...il.com> To: Kyungtae Kim <kt0755@...il.com> Cc: David Miller <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, Byoungyoung Lee <lifeasageek@...il.com>, DaeRyong Jeong <threeearcat@...il.com>, syzkaller <syzkaller@...glegroups.com>, Network Development <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: UBSAN: Undefined behaviour in net/ipv4/ip_output.c On Mon, Jan 21, 2019 at 2:25 PM Kyungtae Kim <kt0755@...il.com> wrote: > > I'm reporting a bug in linux-5.0-rc2: "UBSAN: Undefined behaviour in > net/ipv4/ip_output.c" > > kernel config: https://kt0755.github.io/etc/config-5.0-rc2 > repro: https://kt0755.github.io/etc/repro.b6a11.c Thanks for the report. That reproducer does not seem to exercise system call sendmsg. Did you mean to share another? Perhaps one that users SO_SNDBUFFORCE or sysctl_wmem_max. When constructing a reproducer, I did easily trigger an UBSAN warning when setting SO_SNDBUFFORCE to INT_MAX - 1, so I can imagine that this one can trigger, as well. As long as sk_sndbuf can be set to any integer value, we'll have to be careful with any such multiplication. > Integer overflow happened in __ip_append_data() when 2 * sk->sk_sndbuf > (at line 1004) > is larger than the boundary of the destination (i.e., int). > Some sanity check code right before it would help. > > ========================================= > UBSAN: Undefined behaviour in net/ipv4/ip_output.c:1004:11 > signed integer overflow: > 1282607372 * 2 cannot be represented in type 'int' > CPU: 0 PID: 8465 Comm: syz-executor4 Not tainted 5.0.0-rc2 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xb1/0x118 lib/dump_stack.c:113 > ubsan_epilogue+0x12/0x94 lib/ubsan.c:159 > handle_overflow+0x1cf/0x21a lib/ubsan.c:190 > __ubsan_handle_mul_overflow+0x2a/0x35 lib/ubsan.c:214 > __ip_append_data+0x30ed/0x3350 net/ipv4/ip_output.c:1004 > ip_append_data.part.18+0xf3/0x170 net/ipv4/ip_output.c:1220 > ip_append_data+0x63/0x80 net/ipv4/ip_output.c:1209 > raw_sendmsg+0xd99/0x2b60 net/ipv4/raw.c:670 > inet_sendmsg+0xfc/0x620 net/ipv4/af_inet.c:798 > sock_sendmsg_nosec net/socket.c:621 [inline] > sock_sendmsg+0xdd/0x130 net/socket.c:631 > ___sys_sendmsg+0x7b3/0x950 net/socket.c:2116 > __sys_sendmsg+0xfc/0x1d0 net/socket.c:2154 > __do_sys_sendmsg net/socket.c:2163 [inline] > __se_sys_sendmsg net/socket.c:2161 [inline] > __x64_sys_sendmsg+0x83/0xc0 net/socket.c:2161 > do_syscall_64+0xbe/0x4f0 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x4497b9 > Code: e8 8c 9f 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 > 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d > 01 f0 ff ff 0f 83 9b 6b fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f0d0100bc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007f0d0100c6cc RCX: 00000000004497b9 > RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000013 > RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 00000000000089a0 R14: 00000000006f1a40 R15: 00007f0d0100c700 > ========================================= > > Thanks, > Kyungtae
Powered by blists - more mailing lists