netdev - [syzbot] [bpf?] UBSAN: shift-out-of-bounds in adjust_reg_min_max

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
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <0000000000006f7cb5060cc9c9ac@google.com>
Date: Mon, 18 Dec 2023 06:44:27 -0800
From: syzbot <syzbot+46700eea57ecc7f84776@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, davem@...emloft.net, haoluo@...gle.com, hawk@...nel.org, 
	john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	martin.lau@...ux.dev, nathan@...nel.org, ndesaulniers@...gle.com, 
	netdev@...r.kernel.org, sdf@...gle.com, song@...nel.org, 
	syzkaller-bugs@...glegroups.com, trix@...hat.com, yhs@...com, 
	yonghong.song@...ux.dev
Subject: [syzbot] [bpf?] UBSAN: shift-out-of-bounds in adjust_reg_min_max_vals

Hello,

syzbot found the following issue on:

HEAD commit:    b1dfc0f76231 net: phy: skip LED triggers on PHYs on SFP mo..
git tree:       net
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15d0331ee80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e043d554f0a5f852
dashboard link: https://syzkaller.appspot.com/bug?extid=46700eea57ecc7f84776
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=128c8ad1e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12456fb6e80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fcd0802bfd92/disk-b1dfc0f7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d3d9e5ecc7f0/vmlinux-b1dfc0f7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4b04f82a5ed6/bzImage-b1dfc0f7.xz

The issue was bisected to:

commit f63181b6ae79fd3b034cde641db774268c2c3acf
Author: Andrii Nakryiko <andrii@...nel.org>
Date:   Fri Nov 4 16:36:47 2022 +0000

    bpf: stop setting precise in current state

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10eed821e80000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12eed821e80000
console output: https://syzkaller.appspot.com/x/log.txt?x=14eed821e80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+46700eea57ecc7f84776@...kaller.appspotmail.com
Fixes: f63181b6ae79 ("bpf: stop setting precise in current state")

================================================================================
UBSAN: shift-out-of-bounds in kernel/bpf/verifier.c:13571:63
shift exponent 1073741824 is too large for 32-bit type 'int'
CPU: 0 PID: 5069 Comm: syz-executor200 Not tainted 6.7.0-rc5-syzkaller-00167-gb1dfc0f76231 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2a6/0x480 lib/ubsan.c:387
 scalar32_min_max_arsh kernel/bpf/verifier.c:13571 [inline]
 adjust_scalar_min_max_vals kernel/bpf/verifier.c:13759 [inline]
 adjust_reg_min_max_vals.cold+0x162/0x221 kernel/bpf/verifier.c:13860
 check_alu_op+0x498/0x3a60 kernel/bpf/verifier.c:14092
 do_check kernel/bpf/verifier.c:17517 [inline]
 do_check_common+0x1b30/0xd690 kernel/bpf/verifier.c:20177
 do_check_main kernel/bpf/verifier.c:20240 [inline]
 bpf_check+0x77d9/0xa5e0 kernel/bpf/verifier.c:20877
 bpf_prog_load+0x1531/0x2200 kernel/bpf/syscall.c:2716
 __sys_bpf+0xbf7/0x4920 kernel/bpf/syscall.c:5383
 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5485 [inline]
 __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5485
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ff0c7237af9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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:00007fff01650e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff0c7237af9
RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000006
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000003a28
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>
================================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup