syzbot


KASAN: global-out-of-bounds Read in __nla_validate_parse

Status: upstream: reported C repro on 2024/04/08 05:37
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+ecd7e07b4be038658c9f@syzkaller.appspotmail.com
Fix commit: 8750539ba317 net: team: fix incorrect maxattr
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-net-next-test-gce ci2-upstream-usb], missing on: [ci-upstream-gce-arm64]
First crash: 52d, last: 50d
Discussions (3)
Title Replies (including bot) Last reply
[PATCH net-next] net: team: fix incorrect maxattr 3 (4) 2024/04/11 02:40
Re: [syzbot] Re: [PATCH net-next] net: team: fix incorrect maxattr 0 (1) 2024/04/09 09:41
[syzbot] [net?] KASAN: global-out-of-bounds Read in __nla_validate_parse 3 (4) 2024/04/09 01:27
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in __nla_validate_parse (3) netfilter 24 77d 98d 26/26 fixed on 2024/03/26 19:49
upstream KASAN: stack-out-of-bounds Write in __nla_validate_parse net C done 4 297d 312d 23/26 fixed on 2023/10/12 12:48
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/04/09 09:41 2h18m (2) liuhangbin@gmail.com git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main error OK

Sample crash report:
==================================================================
BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:411 [inline]
BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x1f1c/0x2f70 lib/nlattr.c:635
Read of size 1 at addr ffffffff8c55d030 by task syz-executor361/5080

CPU: 1 PID: 5080 Comm: syz-executor361 Not tainted 6.9.0-rc2-next-20240405-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 validate_nla lib/nlattr.c:411 [inline]
 __nla_validate_parse+0x1f1c/0x2f70 lib/nlattr.c:635
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:760 [inline]
 genl_family_rcv_msg_attrs_parse+0x1d1/0x290 net/netlink/genetlink.c:945
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1093 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x802/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2559
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7f831a5c23a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcd752ec88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffcd752ee58 RCX: 00007f831a5c23a9
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00007f831a635610 R08: 00007f831a5fda23 R09: 00007ffcd752ee58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcd752ee48 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

The buggy address belongs to the variable:
 team_nl_policy+0x30/0x60

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc55d
flags: 0xfff80000002000(reserved|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000002000 ffffea0000315748 ffffea0000315748 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8c55cf00: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8c55cf80: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 f9 f9 f9 f9
>ffffffff8c55d000: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 00 00 00 00
                                     ^
 ffffffff8c55d080: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 00 00 00
 ffffffff8c55d100: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 00 02 f9 f9
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/06 09:01 linux-next 8568bb2ccc27 ca620dd8 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in __nla_validate_parse
2024/04/08 07:19 linux-next 11cb68ad52ac ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in __nla_validate_parse
2024/04/07 11:01 linux-next 8568bb2ccc27 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in __nla_validate_parse
2024/04/06 11:02 linux-next 8568bb2ccc27 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in __nla_validate_parse
2024/04/06 08:34 linux-next 8568bb2ccc27 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in __nla_validate_parse
* Struck through repros no longer work on HEAD.