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bc3aae2bba
Syzkaller hit 'general protection fault in fib_dump_info' bug on
commit 4.13-rc5..
Guilty file: net/ipv4/fib_semantics.c
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 0 PID: 2808 Comm: syz-executor0 Not tainted 4.13.0-rc5 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
task: ffff880078562700 task.stack: ffff880078110000
RIP: 0010:fib_dump_info+0x388/0x1170 net/ipv4/fib_semantics.c:1314
RSP: 0018:ffff880078117010 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 00000000000000fe RCX: 0000000000000002
RDX: 0000000000000006 RSI: ffff880078117084 RDI: 0000000000000030
RBP: ffff880078117268 R08: 000000000000000c R09: ffff8800780d80c8
R10: 0000000058d629b4 R11: 0000000067fce681 R12: 0000000000000000
R13: ffff8800784bd540 R14: ffff8800780d80b5 R15: ffff8800780d80a4
FS: 00000000022fa940(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004387d0 CR3: 0000000079135000 CR4: 00000000000006f0
Call Trace:
inet_rtm_getroute+0xc89/0x1f50 net/ipv4/route.c:2766
rtnetlink_rcv_msg+0x288/0x680 net/core/rtnetlink.c:4217
netlink_rcv_skb+0x340/0x470 net/netlink/af_netlink.c:2397
rtnetlink_rcv+0x28/0x30 net/core/rtnetlink.c:4223
netlink_unicast_kernel net/netlink/af_netlink.c:1265 [inline]
netlink_unicast+0x4c4/0x6e0 net/netlink/af_netlink.c:1291
netlink_sendmsg+0x8c4/0xca0 net/netlink/af_netlink.c:1854
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:643
___sys_sendmsg+0x779/0x8d0 net/socket.c:2035
__sys_sendmsg+0xd1/0x170 net/socket.c:2069
SYSC_sendmsg net/socket.c:2080 [inline]
SyS_sendmsg+0x2d/0x50 net/socket.c:2076
entry_SYSCALL_64_fastpath+0x1a/0xa5
RIP: 0033:0x4512e9
RSP: 002b:00007ffc75584cc8 EFLAGS: 00000216 ORIG_RAX:
000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004512e9
RDX: 0000000000000000 RSI: 0000000020f2cfc8 RDI: 0000000000000003
RBP: 000000000000000e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: fffffffffffffffe
R13: 0000000000718000 R14: 0000000020c44ff0 R15: 0000000000000000
Code: 00 0f b6 8d ec fd ff ff 48 8b 85 f0 fd ff ff 88 48 17 48 8b 45
28 48 8d 78 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03
<0f>
b6 04 02 84 c0 74 08 3c 03 0f 8e cb 0c 00 00 48 8b 45 28 44
RIP: fib_dump_info+0x388/0x1170 net/ipv4/fib_semantics.c:1314 RSP:
ffff880078117010
---[ end trace 254a7af28348f88b ]---
This patch adds a res->fi NULL check.
example run:
$ip route get 0.0.0.0 iif virt1-0
broadcast 0.0.0.0 dev lo
cache <local,brd> iif virt1-0
$ip route get 0.0.0.0 iif virt1-0 fibmatch
RTNETLINK answers: No route to host
Reported-by: idaifish <idaifish@gmail.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.