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Message-ID: <000000000000943e1c061d92bdd6@google.com> Date: Thu, 18 Jul 2024 22:12:23 -0700 From: syzbot <syzbot+707d98c8649695eaf329@...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@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in bq_xmit_all Hello, syzbot found the following issue on: HEAD commit: 73399b58e5e5 Add linux-next specific files for 20240718 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=111f2195980000 kernel config: https://syzkaller.appspot.com/x/.config?x=54e443ddc2b981c8 dashboard link: https://syzkaller.appspot.com/bug?extid=707d98c8649695eaf329 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=1602cf31980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=106fde5e980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fbab059c854f/disk-73399b58.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/874a209f4c3f/vmlinux-73399b58.xz kernel image: https://storage.googleapis.com/syzbot-assets/f34e5c7be278/bzImage-73399b58.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+707d98c8649695eaf329@...kaller.appspotmail.com ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in ./kernel/bpf/devmap.c:385:28 index 16 is out of range for type 'struct xdp_frame *[16]' CPU: 1 UID: 0 PID: 5101 Comm: syz-executor232 Not tainted 6.10.0-next-20240718-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429 bq_xmit_all+0x157/0x11d0 kernel/bpf/devmap.c:385 __dev_flush+0x81/0x160 kernel/bpf/devmap.c:425 xdp_do_check_flushed+0x129/0x240 net/core/filter.c:4300 __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 common_interrupt+0xaa/0xd0 arch/x86/kernel/irq.c:278 </IRQ> <TASK> asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ce cf 5c f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c3 69 c4 f5 65 8b 05 04 5f 65 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9000369fb60 EFLAGS: 00000206 RAX: 3e45100d05912800 RBX: 1ffff920006d3f70 RCX: ffffffff817023ea RDX: dffffc0000000000 RSI: ffffffff8bcad5c0 RDI: 0000000000000001 RBP: ffffc9000369fbf0 R08: ffffffff9300f817 R09: 1ffffffff2601f02 R10: dffffc0000000000 R11: fffffbfff2601f03 R12: dffffc0000000000 R13: 1ffff920006d3f6c R14: ffffc9000369fb80 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] do_notify_parent_cldstop+0x9ab/0xb50 kernel/signal.c:2216 ptrace_stop+0x465/0x940 kernel/signal.c:2319 ptrace_do_notify kernel/signal.c:2393 [inline] ptrace_notify+0x255/0x380 kernel/signal.c:2405 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_entry include/linux/ptrace.h:452 [inline] syscall_trace_enter+0x5d/0x150 kernel/entry/common.c:45 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0xcc/0x230 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f708ebe0e20 Code: ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 80 3d 81 e2 07 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c RSP: 002b:00007ffd97b2a878 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 00007f708ebe0e20 RDX: ffffffffffffffb8 RSI: 0000000020000240 RDI: 0000000000000014 RBP: 0000000000000000 R08: 00007ffd97b2a9a8 R09: 00007ffd97b2a9a8 R10: 00007ffd97b2a9a8 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffd97b2a8b0 R15: 00007ffd97b2a8a0 </TASK> ---[ end trace ]--- ---------------- Code disassembly (best guess): 0: 9c pushf 1: 8f 44 24 20 pop 0x20(%rsp) 5: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1) a: 74 08 je 0x14 c: 4c 89 f7 mov %r14,%rdi f: e8 ce cf 5c f6 call 0xf65ccfe2 14: f6 44 24 21 02 testb $0x2,0x21(%rsp) 19: 75 52 jne 0x6d 1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 c3 69 c4 f5 call 0xf5c469f2 <-- trapping instruction 2f: 65 8b 05 04 5f 65 74 mov %gs:0x74655f04(%rip),%eax # 0x74655f3a 36: 85 c0 test %eax,%eax 38: 74 43 je 0x7d 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: 04 24 add $0x24,%al 3e: 0e (bad) 3f: 36 ss --- 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. 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
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