From: syzbot <syzbot+d40ad71c1ba64324d256@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com,
john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org,
linux-kernel@vger.kernel.org, martin.lau@linux.dev,
sdf@google.com, song@kernel.org,
syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev
Subject: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_map_delete_elem
Date: Sat, 06 Apr 2024 13:17:20 -0700 [thread overview]
Message-ID: <0000000000006c85760615734276@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 026e680b0a08 Merge tag 'pwm/for-6.9-rc3-fixes' of git://gi..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11b1fee3180000
kernel config: https://syzkaller.appspot.com/x/.config?x=5112b3f484393436
dashboard link: https://syzkaller.appspot.com/bug?extid=d40ad71c1ba64324d256
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=10b539b1180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e55795180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3b5659d2008c/disk-026e680b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7fd1552fafde/vmlinux-026e680b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ba622b1b0ec4/bzImage-026e680b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d40ad71c1ba64324d256@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in htab_lock_bucket kernel/bpf/hashtab.c:160 [inline]
BUG: KMSAN: uninit-value in htab_lru_map_delete_elem+0x628/0xb20 kernel/bpf/hashtab.c:1459
htab_lock_bucket kernel/bpf/hashtab.c:160 [inline]
htab_lru_map_delete_elem+0x628/0xb20 kernel/bpf/hashtab.c:1459
____bpf_map_delete_elem kernel/bpf/helpers.c:77 [inline]
bpf_map_delete_elem+0x5c/0x80 kernel/bpf/helpers.c:73
___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
__bpf_prog_run32+0xb2/0xe0 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_run2+0x116/0x300 kernel/trace/bpf_trace.c:2420
__bpf_trace_kfree+0x29/0x40 include/trace/events/kmem.h:94
trace_kfree include/trace/events/kmem.h:94 [inline]
kfree+0x6a5/0xa30 mm/slub.c:4377
kvfree+0x69/0x80 mm/util.c:680
__bpf_prog_put_rcu+0x37/0xf0 kernel/bpf/syscall.c:2232
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0xa59/0x1e70 kernel/rcu/tree.c:2471
rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2488
__do_softirq+0x1c0/0x7d7 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:633 [inline]
irq_exit_rcu+0x6a/0x130 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x83/0x90 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
smap_restore arch/x86/include/asm/smap.h:56 [inline]
get_shadow_origin_ptr mm/kmsan/instrumentation.c:37 [inline]
__msan_metadata_ptr_for_load_8+0x2c/0x40 mm/kmsan/instrumentation.c:92
last_frame arch/x86/kernel/unwind_frame.c:82 [inline]
is_last_frame arch/x86/kernel/unwind_frame.c:87 [inline]
is_last_task_frame+0x62/0x420 arch/x86/kernel/unwind_frame.c:156
unwind_next_frame+0x9d/0x470 arch/x86/kernel/unwind_frame.c:276
arch_stack_walk+0x1ec/0x2d0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0xe0 kernel/stacktrace.c:122
kmsan_save_stack_with_flags mm/kmsan/core.c:74 [inline]
kmsan_internal_chain_origin+0x57/0xd0 mm/kmsan/core.c:183
__msan_chain_origin+0xc3/0x150 mm/kmsan/instrumentation.c:251
__skb_dst_copy include/net/dst.h:282 [inline]
skb_dst_copy include/net/dst.h:290 [inline]
__copy_skb_header+0x362/0x850 net/core/skbuff.c:1528
__skb_clone+0x57/0x650 net/core/skbuff.c:1579
skb_clone+0x3aa/0x550 net/core/skbuff.c:2070
__tcp_transmit_skb+0x438/0x4890 net/ipv4/tcp_output.c:1308
tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
tcp_write_xmit+0x3ee1/0x8900 net/ipv4/tcp_output.c:2792
__tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:2977
tcp_push+0x755/0x7a0 net/ipv4/tcp.c:738
tcp_sendmsg_locked+0x6079/0x6cb0 net/ipv4/tcp.c:1310
tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1342
inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x267/0x380 net/socket.c:745
sock_write_iter+0x368/0x3d0 net/socket.c:1160
call_write_iter include/linux/fs.h:2108 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb63/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:652
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x72/0x7a
Local variable stack created at:
__bpf_prog_run32+0x43/0xe0 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_run2+0x116/0x300 kernel/trace/bpf_trace.c:2420
CPU: 1 PID: 5008 Comm: sshd Not tainted 6.9.0-rc2-syzkaller-00002-g026e680b0a08 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================
---
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next reply other threads:[~2024-04-06 20:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-06 20:17 syzbot [this message]
2024-04-08 22:13 ` [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_map_delete_elem Martin KaFai Lau
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