[syzbot] [bpf?] [net?] general protection fault in __xsk_map_flush

From: syzbot
Date: Mon Jul 15 2024 - 21:24:00 EST

Hello,

syzbot found the following issue on:

HEAD commit: 3fe121b62282 Add linux-next specific files for 20240712
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16085221980000
kernel config: https://syzkaller.appspot.com/x/.config?x=98dd8c4bab5cdce
dashboard link: https://syzkaller.appspot.com/bug?extid=61a1cfc2b6632363d319
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=11a2a5e1980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12dd6479980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8c6fbf69718d/disk-3fe121b6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/39fc7e43dfc1/vmlinux-3fe121b6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0a78e70e4b4e/bzImage-3fe121b6.xz

The issue was bisected to:

commit fecef4cd42c689a200bdd39e6fffa71475904bc1
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Thu Jul 4 14:48:15 2024 +0000

tun: Assign missing bpf_net_context.

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=119d4b6e980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=139d4b6e980000
console output: https://syzkaller.appspot.com/x/log.txt?x=159d4b6e980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+61a1cfc2b6632363d319@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: fecef4cd42c6 ("tun: Assign missing bpf_net_context.")

Oops: general protection fault, probably for non-canonical address 0xe000140493916901: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0x0000c0249c8b4808-0x0000c0249c8b480f]
CPU: 1 UID: 0 PID: 5098 Comm: syz-executor400 Not tainted 6.10.0-rc7-next-20240712-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:xskq_prod_submit net/xdp/xsk_queue.h:436 [inline]
RIP: 0010:xsk_flush net/xdp/xsk.c:331 [inline]
RIP: 0010:__xsk_map_flush+0x95/0x2b0 net/xdp/xsk.c:393
Code: 24 10 49 8d 5f e8 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 d9 ea 81 f6 48 8b 1b 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 72 01 00 00 8b 6b 08 48 83 c3 10 48 89
RSP: 0018:ffffc90000a18ae8 EFLAGS: 00010202
RAX: 0000180493916901 RBX: 0000c0249c8b4800 RCX: ffff888029608000
RDX: 0000000080000101 RSI: 0000000000000010 RDI: 0000c0249c8b4808
RBP: dffffc0000000000 R08: ffffffff896d0c9a R09: 1ffffffff1f5ffad
R10: dffffc0000000000 R11: fffffbfff1f5ffae R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000010 R15: ffffffff8173aee3
FS: 000055557b0fb380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557b0fbca8 CR3: 000000007eb32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
xdp_do_check_flushed+0x18e/0x240 net/core/filter.c:4308
__napi_poll+0xe4/0x490 net/core/dev.c:6774
napi_poll net/core/dev.c:6840 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:6962
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x9f7/0xf50 kernel/printk/printk.c:3103
Code: 20 00 90 0f 0b 90 e9 f3 f9 ff ff e8 c3 1b 20 00 e8 7e 56 20 0a 4d 85 f6 74 c0 e8 b4 1b 20 00 fb 49 bd 00 00 00 00 00 fc ff df <43> 80 3c 2f 00 48 8b 5c 24 30 74 08 48 89 df e8 d5 a1 87 00 4c 8b
RSP: 0018:ffffc90003527880 EFLAGS: 00000293
RAX: ffffffff8173af3c RBX: 0000000000000000 RCX: ffff888029608000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003527a10 R08: ffffffff8173aee3 R09: 1ffffffff1f5ffad
R10: dffffc0000000000 R11: fffffbfff1f5ffae R12: ffffffff8eb30c00
R13: dffffc0000000000 R14: 0000000000000200 R15: 1ffffffff1d6618b
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3173
vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
_printk+0xd5/0x120 kernel/printk/printk.c:2450
show_opcodes+0x148/0x170 arch/x86/kernel/dumpstack.c:123
show_signal_msg arch/x86/mm/fault.c:775 [inline]
__bad_area_nosemaphore+0x5f2/0x770 arch/x86/mm/fault.c:818
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x61d/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f9fe69c315e
Code: fd d7 c9 0f bc d1 c5 fe 7f 27 c5 fe 7f 6f 20 c5 fe 7f 77 40 c5 fe 7f 7f 60 49 83 c0 1f 49 29 d0 48 8d 7c 17 61 e9 d2 04 00 00 <c5> fe 6f 1e c5 fe 6f 56 20 c5 fd 74 cb c5 fd d7 d1 49 83 f8 21 0f
RSP: 002b:00007ffce01d48e8 EFLAGS: 00010287
RAX: 00007ffce01d4900 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00000000000003ff RSI: 0000000000000000 RDI: 00007ffce01d4900
RBP: 00007ffce01d4900 R08: 00000000000003ff R09: 00007ffce01d4e48
R10: 00007ffce01d4e48 R11: 0000000000000246 R12: 6666666666666667
R13: 0000000000000000 R14: 00007ffce01d4d50 R15: 00007ffce01d4d40
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xskq_prod_submit net/xdp/xsk_queue.h:436 [inline]
RIP: 0010:xsk_flush net/xdp/xsk.c:331 [inline]
RIP: 0010:__xsk_map_flush+0x95/0x2b0 net/xdp/xsk.c:393
Code: 24 10 49 8d 5f e8 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 d9 ea 81 f6 48 8b 1b 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 72 01 00 00 8b 6b 08 48 83 c3 10 48 89
RSP: 0018:ffffc90000a18ae8 EFLAGS: 00010202
RAX: 0000180493916901 RBX: 0000c0249c8b4800 RCX: ffff888029608000
RDX: 0000000080000101 RSI: 0000000000000010 RDI: 0000c0249c8b4808
RBP: dffffc0000000000 R08: ffffffff896d0c9a R09: 1ffffffff1f5ffad
R10: dffffc0000000000 R11: fffffbfff1f5ffae R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000010 R15: ffffffff8173aee3
FS: 000055557b0fb380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557b0fbca8 CR3: 000000007eb32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 24 10 and $0x10,%al
2: 49 8d 5f e8 lea -0x18(%r15),%rbx
6: 48 89 d8 mov %rbx,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
12: 74 08 je 0x1c
14: 48 89 df mov %rbx,%rdi
17: e8 d9 ea 81 f6 call 0xf681eaf5
1c: 48 8b 1b mov (%rbx),%rbx
1f: 48 8d 7b 08 lea 0x8(%rbx),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 72 01 00 00 jne 0x1a9
37: 8b 6b 08 mov 0x8(%rbx),%ebp
3a: 48 83 c3 10 add $0x10,%rbx
3e: 48 rex.W
3f: 89 .byte 0x89


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