Hello,
syzbot found the following issue on:
HEAD commit: 7efd0a74039f Merge tag 'ata-6.9-rc4' of git://git.kernel.o..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1492cb93180000
kernel config: https://syzkaller.appspot.com/x/.config?x=b5bc506ebba90cbf
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
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=11ce7393180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155451eb180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9fd81e15f087/disk-7efd0a74.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2e4915d51565/vmlinux-7efd0a74.xz
kernel image: https://storage.googleapis.com/syzbot-assets/110eeae33f94/bzImage-7efd0a74.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
=====================================================
BUG: KMSAN: uninit-value in __htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline]
BUG: KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem+0x3f8/0x630 kernel/bpf/hashtab.c:2343
__htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline]
htab_lru_percpu_map_lookup_percpu_elem+0x3f8/0x630 kernel/bpf/hashtab.c:2343
____bpf_map_lookup_percpu_elem kernel/bpf/helpers.c:133 [inline]
bpf_map_lookup_percpu_elem+0x67/0x90 kernel/bpf/helpers.c:130
___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
security_task_free+0x115/0x150 security/security.c:3032
__put_task_struct+0x17f/0x730 kernel/fork.c:976
put_task_struct include/linux/sched/task.h:138 [inline]
delayed_put_task_struct+0x8a/0x280 kernel/exit.c:229
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
__msan_metadata_ptr_for_load_8+0x31/0x40 mm/kmsan/instrumentation.c:92
filter_irq_stacks+0x60/0x1a0 kernel/stacktrace.c:397
stack_depot_save_flags+0x2c/0x6e0 lib/stackdepot.c:609
stack_depot_save+0x12/0x20 lib/stackdepot.c:685
__msan_poison_alloca+0x106/0x1b0 mm/kmsan/instrumentation.c:285
arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline]
arch_local_irq_save arch/x86/include/asm/irqflags.h:103 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
_raw_spin_lock_irqsave+0x35/0xc0 kernel/locking/spinlock.c:162
remove_wait_queue+0x36/0x270 kernel/sched/wait.c:54
do_wait+0x34a/0x530 kernel/exit.c:1640
kernel_wait4+0x2ab/0x480 kernel/exit.c:1790
__do_sys_wait4 kernel/exit.c:1818 [inline]
__se_sys_wait4 kernel/exit.c:1814 [inline]
__x64_sys_wait4+0x14e/0x310 kernel/exit.c:1814
x64_sys_call+0x6e6/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:62
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
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: 0 PID: 5018 Comm: strace-static-x Not tainted 6.9.0-rc3-syzkaller-00355-g7efd0a74039f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================
---
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 [email protected].
syzbot will keep track of this issue. See:
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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:
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#syz undup
For archival purposes, forwarding an incoming command email to
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***
Subject: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
Author: [email protected]
#syz test: https://linux.googlesource.com/linux/kernel/git/torvalds/linux f2d3b30c96861fc12f905040f9e6cd75dc1a0ade
The information in this email is confidential and may be legally privileged. It is intended solely for the addressee and access to it by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken based on it, is strictly prohibited and may be unlawful.
For archival purposes, forwarding an incoming command email to
[email protected], [email protected].
***
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
Author: [email protected]
#syz test: https://linux.googlesource.com/linux/kernel/git/torvalds/linux 956a9878a57078fafea171ded9cff2ad5352f446
The information in this email is confidential and may be legally privileged. It is intended solely for the addressee and access to it by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken based on it, is strictly prohibited and may be unlawful.
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: [email protected]
Tested on:
commit: f2d3b30c kernel/bpf: KMSAN: uninit-value in htab_lru_p..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
console output: https://syzkaller.appspot.com/x/log.txt?x=149221ca980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b5bc506ebba90cbf
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
tack depth: 8144 bytes left
[ 55.419101][ T4450] EXT4-fs (sda1): re-mounted 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 r/w. Quota mode: none.
mount: mounting smackfs on /sys/fs/smackfs failed: No such file or directory
mount: mounting selinuxfs on /sys/fs/selinux failed: No such file or directory
[ 55.779289][ T4453] mount (4453) used greatest stack depth: 5568 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: OK
Populating /dev using udev: [ 59.585501][ T4483] udevd[4483]: starting version 3.2.11
[ 63.130230][ T4484] udevd[4484]: starting eudev-3.2.11
[ 63.142629][ T4483] udevd (4483) used greatest stack depth: 5376 bytes left
[ 96.265218][ T1224] net_ratelimit: 2 callbacks suppressed
[ 96.265294][ T1224] aoe: packet could not be sent on lo. consider increasing tx_queue_len
[ 96.280260][ T1224] aoe: packet could not be sent on bond0. consider increasing tx_queue_len
[ 96.289350][ T1224] aoe: packet could not be sent on dummy0. consider increasing tx_queue_len
[ 96.298544][ T1224] aoe: packet could not be sent on eql. consider increasing tx_queue_len
[ 96.307476][ T1224] aoe: packet could not be sent on ifb0. consider increasing tx_queue_len
[ 96.316489][ T1224] aoe: packet could not be sent on ifb1. consider increasing tx_queue_len
[ 96.325548][ T1224] aoe: packet could not be sent on eth0. consider increasing tx_queue_len
[ 96.334622][ T1224] aoe: packet could not be sent on wlan0. consider increasing tx_queue_len
[ 96.343626][ T1224] aoe: packet could not be sent on wlan1. consider increasing tx_queue_len
[ 96.352793][ T1224] aoe: packet could not be sent on hwsim0. consider increasing tx_queue_len
done
Starting system message bus: done
Starting iptables: OK
Starting network: OK
Starting dhcpcd...
dhcpcd-9.4.1 starting
dev: loaded udev
DUID 00:04:98:24:4c:28:99:7c:d9:70:fe:51:ca:fe:56:33:2c:7d
forked to background, child pid 4696
[ 111.030473][ T4697] 8021q: adding VLAN 0 to HW filter on device bond0
[ 111.100696][ T4697] eql: remember to turn off Van-Jacobson compression on your slave devices
[ 111.616746][ T10] cfg80211: failed to load regulatory.db
Starting sshd: [ 113.281387][ T4783] sshd (4783) used greatest stack depth: 4392 bytes left
OK
syzkaller
syzkaller login: [ 114.141307][ C0] =====================================================
[ 114.148674][ C0] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0
[ 114.155836][ C0] receive_buf+0x25e3/0x5fd0
[ 114.160622][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.165429][ C0] __napi_poll+0xe7/0x980
[ 114.170059][ C0] net_rx_action+0x82a/0x1850
[ 114.174955][ C0] handle_softirqs+0x1ce/0x800
[ 114.179889][ C0] __irq_exit_rcu+0x68/0x120
[ 114.184692][ C0] irq_exit_rcu+0x12/0x20
[ 114.189250][ C0] common_interrupt+0x94/0xa0
[ 114.194165][ C0] asm_common_interrupt+0x2b/0x40
[ 114.199461][ C0] virt_to_page_or_null+0xf0/0x150
[ 114.204769][ C0] kmsan_get_metadata+0x146/0x1d0
[ 114.209965][ C0] kmsan_get_shadow_origin_ptr+0x38/0xb0
[ 114.215799][ C0] __msan_metadata_ptr_for_load_8+0x24/0x40
[ 114.221887][ C0] is_last_task_frame+0x62/0x420
[ 114.227000][ C0] unwind_next_frame+0x9d/0x470
[ 114.231997][ C0] arch_stack_walk+0x1ec/0x2d0
[ 114.237029][ C0] stack_trace_save+0xaa/0xe0
[ 114.241881][ C0] kmsan_internal_chain_origin+0x57/0xd0
[ 114.247698][ C0] kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.254063][ C0] __msan_memcpy+0x108/0x1c0
[ 114.258744][ C0] sock_write_iter+0x38e/0x3d0
[ 114.263898][ C0] vfs_write+0xb38/0x1550
[ 114.268406][ C0] ksys_write+0x20f/0x4c0
[ 114.272940][ C0] __x64_sys_write+0x93/0xe0
[ 114.277742][ C0] x64_sys_call+0x3093/0x3b90
[ 114.283323][ C0] do_syscall_64+0xcd/0x1e0
[ 114.288178][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.294332][ C0]
[ 114.296980][ C0] Uninit was created at:
[ 114.301397][ C0] __alloc_pages_noprof+0x9d6/0xe70
[ 114.306908][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 114.312874][ C0] alloc_pages_noprof+0x1bf/0x1e0
[ 114.318109][ C0] skb_page_frag_refill+0x2bf/0x7c0
[ 114.323487][ C0] virtnet_rq_alloc+0x43/0xbb0
[ 114.328434][ C0] try_fill_recv+0x3f0/0x2f50
[ 114.333556][ C0] virtnet_open+0x1cc/0xb00
[ 114.338238][ C0] __dev_open+0x546/0x6f0
[ 114.342858][ C0] __dev_change_flags+0x309/0x9a0
[ 114.348074][ C0] dev_change_flags+0x8e/0x1d0
[ 114.353097][ C0] devinet_ioctl+0x13ec/0x22c0
[ 114.358127][ C0] inet_ioctl+0x4bd/0x6d0
[ 114.362784][ C0] sock_do_ioctl+0xb7/0x540
[ 114.367599][ C0] sock_ioctl+0x727/0xd70
[ 114.372193][ C0] __se_sys_ioctl+0x261/0x450
[ 114.377188][ C0] __x64_sys_ioctl+0x96/0xe0
[ 114.382012][ C0] x64_sys_call+0x18c0/0x3b90
[ 114.387389][ C0] do_syscall_64+0xcd/0x1e0
[ 114.392122][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.398360][ C0]
[ 114.400882][ C0] CPU: 0 PID: 4697 Comm: dhcpcd Not tainted 6.10.0-rc3-syzkaller-00001-g956a9878a570 #0
[ 114.410797][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 114.421038][ C0] =====================================================
[ 114.428277][ C0] Disabling lock debugging due to kernel taint
[ 114.434617][ C0] Kernel panic - not syncing: kmsan.panic set ...
[ 114.441168][ C0] CPU: 0 PID: 4697 Comm: dhcpcd Tainted: G B 6.10.0-rc3-syzkaller-00001-g956a9878a570 #0
[ 114.452775][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 114.462940][ C0] Call Trace:
[ 114.466456][ C0] <IRQ>
[ 114.469372][ C0] dump_stack_lvl+0x216/0x2d0
[ 114.474259][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.480223][ C0] dump_stack+0x1e/0x30
[ 114.484499][ C0] panic+0x4e2/0xcd0
[ 114.488493][ C0] ? kmsan_get_metadata+0x51/0x1d0
[ 114.493722][ C0] kmsan_report+0x2d5/0x2e0
[ 114.498385][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.504323][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.509625][ C0] ? __msan_warning+0x95/0x120
[ 114.514761][ C0] ? receive_buf+0x25e3/0x5fd0
[ 114.519656][ C0] ? virtnet_poll+0xd1c/0x23c0
[ 114.524559][ C0] ? __napi_poll+0xe7/0x980
[ 114.529199][ C0] ? net_rx_action+0x82a/0x1850
[ 114.534316][ C0] ? handle_softirqs+0x1ce/0x800
[ 114.539583][ C0] ? __irq_exit_rcu+0x68/0x120
[ 114.544544][ C0] ? irq_exit_rcu+0x12/0x20
[ 114.549164][ C0] ? common_interrupt+0x94/0xa0
[ 114.554156][ C0] ? asm_common_interrupt+0x2b/0x40
[ 114.559485][ C0] ? virt_to_page_or_null+0xf0/0x150
[ 114.564878][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.570183][ C0] ? kmsan_get_shadow_origin_ptr+0x38/0xb0
[ 114.576101][ C0] ? __msan_metadata_ptr_for_load_8+0x24/0x40
[ 114.582270][ C0] ? is_last_task_frame+0x62/0x420
[ 114.587529][ C0] ? unwind_next_frame+0x9d/0x470
[ 114.592633][ C0] ? arch_stack_walk+0x1ec/0x2d0
[ 114.597935][ C0] ? stack_trace_save+0xaa/0xe0
[ 114.602932][ C0] ? kmsan_internal_chain_origin+0x57/0xd0
[ 114.609058][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.615513][ C0] ? __msan_memcpy+0x108/0x1c0
[ 114.620375][ C0] ? sock_write_iter+0x38e/0x3d0
[ 114.625423][ C0] ? vfs_write+0xb38/0x1550
[ 114.630144][ C0] ? ksys_write+0x20f/0x4c0
[ 114.634752][ C0] ? __x64_sys_write+0x93/0xe0
[ 114.639611][ C0] ? x64_sys_call+0x3093/0x3b90
[ 114.644574][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.649357][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.655580][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.661089][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.666460][ C0] ? page_to_skb+0xdae/0x1620
[ 114.671465][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.676893][ C0] __msan_warning+0x95/0x120
[ 114.681587][ C0] receive_buf+0x25e3/0x5fd0
[ 114.686629][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.692034][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.697966][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.702687][ C0] ? __pfx_virtnet_poll+0x10/0x10
[ 114.707811][ C0] __napi_poll+0xe7/0x980
[ 114.712253][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.717564][ C0] net_rx_action+0x82a/0x1850
[ 114.722441][ C0] ? sched_clock_cpu+0x55/0x870
[ 114.727421][ C0] ? __pfx_net_rx_action+0x10/0x10
[ 114.732628][ C0] handle_softirqs+0x1ce/0x800
[ 114.737611][ C0] __irq_exit_rcu+0x68/0x120
[ 114.742301][ C0] irq_exit_rcu+0x12/0x20
[ 114.746720][ C0] common_interrupt+0x94/0xa0
[ 114.751524][ C0] </IRQ>
[ 114.754533][ C0] <TASK>
[ 114.757619][ C0] asm_common_interrupt+0x2b/0x40
[ 114.762781][ C0] RIP: 0010:virt_to_page_or_null+0xf0/0x150
[ 114.768821][ C0] Code: f6 c0 08 75 15 48 c1 ea 15 48 8b 76 08 83 e2 3f 31 c9 48 0f a3 56 10 0f 92 c1 65 ff 0d 11 43 c5 7d 74 4d 65 ff 0d 08 43 c5 7d <85> c9 0f 84 3b ff ff ff 48 81 ff 00 00 00 80 72 09 48 8b 0d 78 74
[ 114.788641][ C0] RSP: 0018:ffff8881160076b0 EFLAGS: 00000286
[ 114.794817][ C0] RAX: ffff888194a30020 RBX: ffff888114a30020 RCX: 0000000000000001
[ 114.802961][ C0] RDX: 0000000114a30020 RSI: ffff88813fff9220 RDI: ffff888114a30020
[ 114.811014][ C0] RBP: ffff8881160076b0 R08: ffffea000000000f R09: ffff888116004000
[ 114.819084][ C0] R10: ffff888116007818 R11: ffffffff81935550 R12: 0000000000000000
[ 114.827135][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffff888114a30020
[ 114.835190][ C0] ? __pfx_stack_trace_consume_entry+0x10/0x10
[ 114.841475][ C0] kmsan_get_metadata+0x146/0x1d0
[ 114.846629][ C0] kmsan_get_shadow_origin_ptr+0x38/0xb0
[ 114.852370][ C0] __msan_metadata_ptr_for_load_8+0x24/0x40
[ 114.858386][ C0] is_last_task_frame+0x62/0x420
[ 114.863429][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.869401][ C0] unwind_next_frame+0x9d/0x470
[ 114.874444][ C0] arch_stack_walk+0x1ec/0x2d0
[ 114.879348][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.884168][ C0] ? __pfx_stack_trace_consume_entry+0x10/0x10
[ 114.890569][ C0] stack_trace_save+0xaa/0xe0
[ 114.895448][ C0] kmsan_internal_chain_origin+0x57/0xd0
[ 114.901315][ C0] ? kmsan_internal_chain_origin+0x57/0xd0
[ 114.907242][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
[ 114.913797][ C0] ? __msan_memcpy+0x108/0x1c0
[ 114.918732][ C0] ? sock_write_iter+0x38e/0x3d0
[ 114.923798][ C0] ? vfs_write+0xb38/0x1550
[ 114.928458][ C0] ? ksys_write+0x20f/0x4c0
[ 114.933071][ C0] ? __x64_sys_write+0x93/0xe0
[ 114.937962][ C0] ? x64_sys_call+0x3093/0x3b90
[ 114.943128][ C0] ? do_syscall_64+0xcd/0x1e0
[ 114.947923][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.953292][ C0] ? kmsan_internal_set_shadow_origin+0x69/0x100
[ 114.959771][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.965109][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.970431][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.976472][ C0] ? unix_dgram_sendmsg+0xd93/0x2ce0
[ 114.981868][ C0] ? aa_sk_perm+0x881/0xd90
[ 114.986487][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.991792][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.997731][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 115.003121][ C0] kmsan_internal_memmove_metadata+0x17b/0x230
[ 115.009411][ C0] __msan_memcpy+0x108/0x1c0
[ 115.014216][ C0] sock_write_iter+0x38e/0x3d0
[ 115.019109][ C0] vfs_write+0xb38/0x1550
[ 115.023542][ C0] ? __pfx_sock_write_iter+0x10/0x10
[ 115.029014][ C0] ksys_write+0x20f/0x4c0
[ 115.033533][ C0] __x64_sys_write+0x93/0xe0
[ 115.038236][ C0] x64_sys_call+0x3093/0x3b90
[ 115.043164][ C0] do_syscall_64+0xcd/0x1e0
[ 115.047796][ C0] ? clear_bhb_loop+0x25/0x80
[ 115.052625][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 115.058663][ C0] RIP: 0033:0x7f96e0e10bf2
[ 115.063173][ C0] Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
[ 115.082994][ C0] RSP: 002b:00007fffc25d6c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 115.091610][ C0] RAX: ffffffffffffffda RBX: 00007f96e0eec4c0 RCX: 00007f96e0e10bf2
[ 115.099666][ C0] RDX: 0000000000000020 RSI: 00005598f18db020 RDI: 0000000000000002
[ 115.108056][ C0] RBP: 0000000000000020 R08: 0000000000000000 R09: 0000000000000000
[ 115.116367][ C0] R10: 00007fffc25d7a50 R11: 0000000000000246 R12: 0000000000000020
[ 115.124456][ C0] R13: 00005598f18db020 R14: 0000000000000000 R15: 0000000000000000
[ 115.132580][ C0] </TASK>
[ 115.136102][ C0] Kernel Offset: disabled
[ 115.140501][ C0] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3221393454=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at c8349e4853
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"c8349e48534ea6d8f01515335d95de8ebf5da8df\"
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1344182e980000
Tested on:
commit: 956a9878 kernel/bpf: KMSAN: uninit-value in htab_lru_p..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
kernel config: https://syzkaller.appspot.com/x/.config?x=3486f1660f47f855
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.
For archival purposes, forwarding an incoming command email to
[email protected], [email protected].
***
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
Author: [email protected]
#syz test: https://linux.googlesource.com/linux/kernel/git/torvalds/linux 78161c936167954351de8125d5e52c9034fd86c8
The information in this email is confidential and may be legally privileged. It is intended solely for the addressee and access to it by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken based on it, is strictly prohibited and may be unlawful.
For archival purposes, forwarding an incoming command email to
[email protected], [email protected].
***
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
Author: [email protected]
#syz test: https://linux.googlesource.com/linux/kernel/git/torvalds/linux e478cf26c556e4ab572ab0ab2306c986901dcd61
The information in this email is confidential and may be legally privileged. It is intended solely for the addressee and access to it by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken based on it, is strictly prohibited and may be unlawful.
For archival purposes, forwarding an incoming command email to
[email protected], [email protected].
***
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
Author: [email protected]
#syz test: https://linux.googlesource.com/linux/kernel/git/torvalds/linux e478cf26c556e4ab572ab0ab2306c986901dcd61
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -139,7 +139,7 @@ const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto = {
.pkt_access = true,
.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
.arg1_type = ARG_CONST_MAP_PTR,
- .arg2_type = ARG_PTR_TO_MAP_KEY,
+ .arg2_type = ARG_PTR_TO_MAP_KEY | MEM_RDONLY,
.arg3_type = ARG_ANYTHING,
};
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -7146,8 +7146,8 @@ static int check_stack_range_initialized(
* reads. However, if raw_mode is not set, we'll do extra
* checks below.
*/
- bounds_check_type = BPF_WRITE;
- clobber = true;
+ clobber = !meta || meta->raw_mode;
+ bounds_check_type = clobber ? BPF_WRITE : BPF_READ;
} else {
bounds_check_type = BPF_READ;
}
@@ -7230,8 +7230,7 @@ static int check_stack_range_initialized(
stype = &state->stack[spi].slot_type[slot % BPF_REG_SIZE];
if (*stype == STACK_MISC)
goto mark;
- if ((*stype == STACK_ZERO) ||
- (*stype == STACK_INVALID && env->allow_uninit_stack)) {
+ if (*stype == STACK_ZERO) {
if (clobber) {
/* helper can write anything into the stack */
*stype = STACK_MISC;
@@ -8748,6 +8747,7 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 arg,
meta->map_uid = reg->map_uid;
break;
case ARG_PTR_TO_MAP_KEY:
+ meta->raw_mode = !(arg_type & MEM_RDONLY); // read only fo const* pointer
/* bpf_map_xxx(..., map_ptr, ..., key) call:
* check that [key, key + map->key_size) are within
* stack limits and initialized
@@ -8763,7 +8763,7 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 arg,
}
err = check_helper_mem_access(env, regno,
meta->map_ptr->key_size, false,
- NULL);
+ meta);
break;
case ARG_PTR_TO_MAP_VALUE:
if (type_may_be_null(arg_type) && register_is_null(reg))
--
2.35.3
The information in this email is confidential and may be legally privileged. It is intended solely for the addressee and access to it by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken based on it, is strictly prohibited and may be unlawful.
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
61ee5452e1b2df'
[ 49.565928][ T1] ima: Allocated hash algorithm: sha256
[ 49.572049][ T1] ima: No architecture policies found
[ 49.578974][ T1] evm: Initialising EVM extended attributes:
[ 49.585220][ T1] evm: security.selinux (disabled)
[ 49.590764][ T1] evm: security.SMACK64 (disabled)
[ 49.595968][ T1] evm: security.SMACK64EXEC (disabled)
[ 49.601835][ T1] evm: security.SMACK64TRANSMUTE (disabled)
[ 49.608506][ T1] evm: security.SMACK64MMAP (disabled)
[ 49.614038][ T1] evm: security.apparmor
[ 49.618451][ T1] evm: security.ima
[ 49.622436][ T1] evm: security.capability
[ 49.627502][ T1] evm: HMAC attrs: 0x1
[ 49.636597][ T1] PM: Magic number: 12:387:485
[ 49.642665][ T1] usb usb18-port6: hash matches
[ 49.648999][ T1] usb usb17-port7: hash matches
[ 49.655774][ T1] printk: legacy console [netcon0] enabled
[ 49.662095][ T1] netconsole: network logging started
[ 49.669345][ T1] gtp: GTP module loaded (pdp ctx size 128 bytes)
[ 49.678657][ T1] rdma_rxe: loaded
[ 49.684488][ T1] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 49.706425][ T1] Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 49.724152][ T1] Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
[ 49.733298][ T1] clk: Disabling unused clocks
[ 49.739237][ T1] ALSA device list:
[ 49.743250][ T1] #0: Dummy 1
[ 49.747040][ T1] #1: Loopback 1
[ 49.750957][ T1] #2: Virtual MIDI Card 1
[ 49.761414][ T43] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 49.771525][ T43] platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
[ 49.781327][ T1] md: Waiting for all devices to be available before autodetect
[ 49.789841][ T1] md: If you don't use raid, use raid=noautodetect
[ 49.796709][ T1] md: Autodetecting RAID arrays.
[ 49.801753][ T1] md: autorun ...
[ 49.805475][ T1] md: ... autorun DONE.
[ 49.898217][ T1] EXT4-fs (sda1): mounted filesystem 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 ro with ordered data mode. Quota mode: none.
[ 49.911801][ T1] VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
[ 49.935132][ T1] devtmpfs: mounted
[ 50.190758][ T1] Freeing unused kernel image (initmem) memory: 37036K
[ 50.202710][ T1] Write protecting the kernel read-only data: 262144k
[ 50.249033][ T1] Freeing unused kernel image (rodata/data gap) memory: 1808K
[ 51.885170][ T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 51.895531][ T1] x86/mm: Checking user space page tables
[ 53.391911][ T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 53.401141][ T1] Failed to set sysctl parameter 'kernel.hung_task_all_cpu_backtrace=1': parameter not found
[ 53.422983][ T1] Failed to set sysctl parameter 'max_rcu_stall_to_panic=1': parameter not found
[ 53.434940][ T1] Run /sbin/init as init process
[ 54.937583][ T4446] mount (4446) used greatest stack depth: 8144 bytes left
[ 55.037752][ T4447] EXT4-fs (sda1): re-mounted 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 r/w. Quota mode: none.
mount: mounting smackfs on /sys/fs/smackfs failed: No such file or directory
mount: mounting selinuxfs on /sys/fs/selinux failed: No such file or directory
[ 55.371085][ T4450] mount (4450) used greatest stack depth: 5568 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: OK
Populating /dev using udev: [ 59.193733][ T4480] udevd[4480]: starting version 3.2.11
[ 62.697884][ T4481] udevd[4481]: starting eudev-3.2.11
[ 62.710663][ T4480] udevd (4480) used greatest stack depth: 5264 bytes left
done
Starting system message bus: done
Starting iptables: OK
Starting network: OK
Starting dhcpcd...
dhcpcd-9.4.1 starting
dev: loaded udev
DUID 00:04:98:24:4c:28:99:7c:d9:70:fe:51:ca:fe:56:33:2c:7d
forked to background, child pid 4693
no interfaces have a carrier
[ 110.077072][ T4694] 8021q: adding VLAN 0 to HW filter on device bond0
[ 110.114606][ T4694] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting sshd: [ 111.638151][ T43] cfg80211: failed to load regulatory.db
OK
syzkaller
syzkaller login: [ 115.668614][ C0] =====================================================
[ 115.675770][ C0] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0
[ 115.682913][ C0] receive_buf+0x25e3/0x5fd0
[ 115.687725][ C0] virtnet_poll+0xd1c/0x23c0
[ 115.692508][ C0] __napi_poll+0xe7/0x980
[ 115.697035][ C0] net_rx_action+0x82a/0x1850
[ 115.701947][ C0] handle_softirqs+0x1ce/0x800
[ 115.706920][ C0] __irq_exit_rcu+0x68/0x120
[ 115.711977][ C0] irq_exit_rcu+0x12/0x20
[ 115.716495][ C0] common_interrupt+0x94/0xa0
[ 115.721393][ C0] asm_common_interrupt+0x2b/0x40
[ 115.726789][ C0] kmsan_metadata_is_contiguous+0x11/0x1e0
[ 115.732777][ C0] kmsan_get_shadow_origin_ptr+0x2a/0xb0
[ 115.738611][ C0] __msan_metadata_ptr_for_load_8+0x24/0x40
[ 115.744707][ C0] kmem_cache_alloc_noprof+0x1b0/0xb20
[ 115.750434][ C0] anon_vma_fork+0x2c8/0xad0
[ 115.755224][ C0] copy_mm+0x1b57/0x3ca0
[ 115.759770][ C0] copy_process+0x26f7/0x5b90
[ 115.764746][ C0] kernel_clone+0x401/0x1040
[ 115.769622][ C0] __x64_sys_clone+0x25c/0x360
[ 115.774688][ C0] x64_sys_call+0x2a45/0x3b90
[ 115.779774][ C0] do_syscall_64+0xcd/0x1e0
[ 115.784469][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 115.790699][ C0]
[ 115.793105][ C0] Uninit was created at:
[ 115.797720][ C0] __alloc_pages_noprof+0x9d6/0xe70
[ 115.803195][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 115.808997][ C0] alloc_pages_noprof+0x1bf/0x1e0
[ 115.814258][ C0] skb_page_frag_refill+0x2bf/0x7c0
[ 115.819691][ C0] virtnet_rq_alloc+0x43/0xbb0
[ 115.824701][ C0] try_fill_recv+0x3f0/0x2f50
[ 115.829565][ C0] virtnet_open+0x1cc/0xb00
[ 115.834627][ C0] __dev_open+0x546/0x6f0
[ 115.839151][ C0] __dev_change_flags+0x309/0x9a0
[ 115.844358][ C0] dev_change_flags+0x8e/0x1d0
[ 115.849310][ C0] devinet_ioctl+0x13ec/0x22c0
[ 115.854298][ C0] inet_ioctl+0x4bd/0x6d0
[ 115.858825][ C0] sock_do_ioctl+0xb7/0x540
[ 115.863572][ C0] sock_ioctl+0x727/0xd70
[ 115.868115][ C0] __se_sys_ioctl+0x261/0x450
[ 115.872978][ C0] __x64_sys_ioctl+0x96/0xe0
[ 115.877780][ C0] x64_sys_call+0x18c0/0x3b90
[ 115.882898][ C0] do_syscall_64+0xcd/0x1e0
[ 115.887598][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 115.894138][ C0]
[ 115.896697][ C0] CPU: 0 PID: 4833 Comm: dhcpcd-run-hook Not tainted 6.10.0-rc3-syzkaller-00022-g78161c936167 #0
[ 115.907699][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
[ 115.918263][ C0] =====================================================
[ 115.925284][ C0] Disabling lock debugging due to kernel taint
[ 115.931598][ C0] Kernel panic - not syncing: kmsan.panic set ...
[ 115.938121][ C0] CPU: 0 PID: 4833 Comm: dhcpcd-run-hook Tainted: G B 6.10.0-rc3-syzkaller-00022-g78161c936167 #0
[ 115.951147][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
[ 115.961392][ C0] Call Trace:
[ 115.964735][ C0] <IRQ>
[ 115.967631][ C0] dump_stack_lvl+0x216/0x2d0
[ 115.972463][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 115.978480][ C0] dump_stack+0x1e/0x30
[ 115.982741][ C0] panic+0x4e2/0xcd0
[ 115.986784][ C0] ? kmsan_get_metadata+0x81/0x1d0
[ 115.992099][ C0] kmsan_report+0x2d5/0x2e0
[ 115.996714][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.002010][ C0] ? __msan_warning+0x95/0x120
[ 116.007035][ C0] ? receive_buf+0x25e3/0x5fd0
[ 116.011916][ C0] ? virtnet_poll+0xd1c/0x23c0
[ 116.016876][ C0] ? __napi_poll+0xe7/0x980
[ 116.021526][ C0] ? net_rx_action+0x82a/0x1850
[ 116.026608][ C0] ? handle_softirqs+0x1ce/0x800
[ 116.031670][ C0] ? __irq_exit_rcu+0x68/0x120
[ 116.036542][ C0] ? irq_exit_rcu+0x12/0x20
[ 116.041163][ C0] ? common_interrupt+0x94/0xa0
[ 116.046211][ C0] ? asm_common_interrupt+0x2b/0x40
[ 116.051608][ C0] ? kmsan_metadata_is_contiguous+0x11/0x1e0
[ 116.057724][ C0] ? kmsan_get_shadow_origin_ptr+0x2a/0xb0
[ 116.063734][ C0] ? __msan_metadata_ptr_for_load_8+0x24/0x40
[ 116.069923][ C0] ? kmem_cache_alloc_noprof+0x1b0/0xb20
[ 116.075660][ C0] ? anon_vma_fork+0x2c8/0xad0
[ 116.080547][ C0] ? copy_mm+0x1b57/0x3ca0
[ 116.085158][ C0] ? copy_process+0x26f7/0x5b90
[ 116.090122][ C0] ? kernel_clone+0x401/0x1040
[ 116.095009][ C0] ? __x64_sys_clone+0x25c/0x360
[ 116.100114][ C0] ? x64_sys_call+0x2a45/0x3b90
[ 116.105088][ C0] ? do_syscall_64+0xcd/0x1e0
[ 116.109969][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 116.116530][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
[ 116.123065][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.128453][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.133856][ C0] ? page_to_skb+0xdae/0x1620
[ 116.138636][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.143993][ C0] __msan_warning+0x95/0x120
[ 116.148713][ C0] receive_buf+0x25e3/0x5fd0
[ 116.153414][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.158922][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 116.164985][ C0] virtnet_poll+0xd1c/0x23c0
[ 116.169720][ C0] ? __pfx_virtnet_poll+0x10/0x10
[ 116.174942][ C0] __napi_poll+0xe7/0x980
[ 116.179431][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.184754][ C0] net_rx_action+0x82a/0x1850
[ 116.189579][ C0] ? sched_clock_cpu+0x55/0x870
[ 116.194593][ C0] ? __pfx_net_rx_action+0x10/0x10
[ 116.199846][ C0] handle_softirqs+0x1ce/0x800
[ 116.204734][ C0] __irq_exit_rcu+0x68/0x120
[ 116.209452][ C0] irq_exit_rcu+0x12/0x20
[ 116.213891][ C0] common_interrupt+0x94/0xa0
[ 116.218689][ C0] </IRQ>
[ 116.221668][ C0] <TASK>
[ 116.224666][ C0] asm_common_interrupt+0x2b/0x40
[ 116.229996][ C0] RIP: 0010:kmsan_metadata_is_contiguous+0x11/0x1e0
[ 116.236882][ C0] Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 <48> 83 ec 28 41 b7 01 48 85 f6 0f 84 fa 00 00 00 49 89 f6 49 89 fd
[ 116.256797][ C0] RSP: 0018:ffff88811798b800 EFLAGS: 00000202
[ 116.263179][ C0] RAX: 0000000000000000 RBX: 0000000000000286 RCX: 000000023fd2eed8
[ 116.271335][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88813fcaaed0
[ 116.279678][ C0] RBP: ffff88811798b828 R08: ffffea000000000f R09: 0000000000000000
[ 116.287830][ C0] R10: ffff88811718b8e0 R11: 0000000000000004 R12: 0000000000000000
[ 116.296069][ C0] R13: 00000000000aaed0 R14: 0000000000000000 R15: ffff88813fcaaed0
[ 116.304176][ C0] kmsan_get_shadow_origin_ptr+0x2a/0xb0
[ 116.309957][ C0] __msan_metadata_ptr_for_load_8+0x24/0x40
[ 116.315975][ C0] kmem_cache_alloc_noprof+0x1b0/0xb20
[ 116.321559][ C0] ? anon_vma_fork+0x2c8/0xad0
[ 116.326458][ C0] anon_vma_fork+0x2c8/0xad0
[ 116.331167][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 116.337093][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.342519][ C0] copy_mm+0x1b57/0x3ca0
[ 116.346908][ C0] copy_process+0x26f7/0x5b90
[ 116.351896][ C0] kernel_clone+0x401/0x1040
[ 116.356596][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.361896][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 116.367640][ C0] ? __msan_memset+0xf5/0x1b0
[ 116.372457][ C0] __x64_sys_clone+0x25c/0x360
[ 116.377377][ C0] x64_sys_call+0x2a45/0x3b90
[ 116.382201][ C0] do_syscall_64+0xcd/0x1e0
[ 116.386840][ C0] ? clear_bhb_loop+0x25/0x80
[ 116.391663][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 116.397791][ C0] RIP: 0033:0x7f5286b82a12
[ 116.402300][ C0] Code: 41 5d 41 5e 41 5f c3 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 e7 43 0f 00 f7 d8 64 89 02 48 83
[ 116.422246][ C0] RSP: 002b:00007ffc58a2d428 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[ 116.430864][ C0] RAX: ffffffffffffffda RBX: 000055b776464901 RCX: 00007f5286b82a12
[ 116.438942][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[ 116.447162][ C0] RBP: 000055b776465ba0 R08: 0000000000000000 R09: 3c00000000001001
[ 116.455213][ C0] R10: 00007f5286a48650 R11: 0000000000000246 R12: 000055b776468368
[ 116.463463][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 116.471794][ C0] </TASK>
[ 116.475163][ C0] Kernel Offset: disabled
[ 116.479655][ C0] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build572936856=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at c8349e4853
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"c8349e48534ea6d8f01515335d95de8ebf5da8df\"
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=11313a2e980000
Tested on:
commit: 78161c93 kernel/bpf: KMSAN: uninit-value in htab_lru_p..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
kernel config: https://syzkaller.appspot.com/x/.config?x=3486f1660f47f855
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
failed to apply patch:
checking file kernel/bpf/helpers.c
Hunk #1 FAILED at 139.
Hunk #2 FAILED at 7146.
Hunk #3 FAILED at 7230.
Hunk #4 FAILED at 8748.
Hunk #5 FAILED at 8763.
5 out of 5 hunks FAILED
Tested on:
commit: e478cf26 Merge branch 'bpf-fix-a-couple-of-test-failur..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
kernel config: https://syzkaller.appspot.com/x/.config?x=b5bc506ebba90cbf
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler:
patch: https://syzkaller.appspot.com/x/patch.diff?x=127983ee980000
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: [email protected]
Tested on:
commit: e478cf26 Merge branch 'bpf-fix-a-couple-of-test-failur..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
console output: https://syzkaller.appspot.com/x/log.txt?x=1403c99c980000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ad6a8768920dd4b
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=13c6e77a980000
Note: testing is done by a robot and is best-effort only.
For archival purposes, forwarding an incoming command email to
[email protected], [email protected].
***
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem
Author: [email protected]
#syz test: https://linux.googlesource.com/linux/kernel/git/torvalds/linux e478cf26c556e4ab572ab0ab2306c986901dcd61
The information in this email is confidential and may be legally privileged. It is intended solely for the addressee and access to it by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken based on it, is strictly prohibited and may be unlawful.
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: [email protected]
Tested on:
commit: e478cf26 Merge branch 'bpf-fix-a-couple-of-test-failur..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
console output: https://syzkaller.appspot.com/x/log.txt?x=1345c141980000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ad6a8768920dd4b
dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=126193e2980000
Note: testing is done by a robot and is best-effort only.