linux-kernel - [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_hash_lookup

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Message-ID: <0000000000006cbc570618c0d4a3@google.com>
Date: Sat, 18 May 2024 14:05:36 -0700
From: syzbot <syzbot+80cf9d55d6fd2d6a9838@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, davem@...emloft.net, eddyz87@...il.com, 
	haoluo@...gle.com, hawk@...nel.org, john.fastabend@...il.com, 
	jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, martin.lau@...ux.dev, netdev@...r.kernel.org, 
	sdf@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com, 
	yonghong.song@...ux.dev
Subject: [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_hash_lookup_elem

Hello,

syzbot found the following issue on:

HEAD commit:    614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1429a96c980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507
dashboard link: https://syzkaller.appspot.com/bug?extid=80cf9d55d6fd2d6a9838
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a53ae4980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=113003d4980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+80cf9d55d6fd2d6a9838@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in __dev_map_hash_lookup_elem kernel/bpf/devmap.c:270 [inline]
BUG: KMSAN: uninit-value in dev_map_hash_lookup_elem+0x116/0x2e0 kernel/bpf/devmap.c:803
 __dev_map_hash_lookup_elem kernel/bpf/devmap.c:270 [inline]
 dev_map_hash_lookup_elem+0x116/0x2e0 kernel/bpf/devmap.c:803
 ____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline]
 bpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
 __bpf_prog_run64+0xb5/0xe0 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x150/0x340 kernel/trace/bpf_trace.c:2422
 __bpf_trace_sched_switch+0x37/0x50 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2eca/0x6bc0 kernel/sched/core.c:6743
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x13d/0x380 kernel/sched/core.c:6838
 ptrace_stop+0x8eb/0xd60 kernel/signal.c:2358
 ptrace_do_notify kernel/signal.c:2395 [inline]
 ptrace_notify+0x234/0x320 kernel/signal.c:2407
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0x14e/0x3e0 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x135/0x160 kernel/entry/common.c:218
 do_syscall_64+0xdc/0x1e0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable stack created at:
 __bpf_prog_run64+0x45/0xe0 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x150/0x340 kernel/trace/bpf_trace.c:2422

CPU: 0 PID: 5042 Comm: syz-executor593 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
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