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Message-ID: <000000000000d3a01d061dc54329@google.com> Date: Sun, 21 Jul 2024 10:29:03 -0700 From: syzbot <syzbot+707d98c8649695eaf329@...kaller.appspotmail.com> To: aha310510@...il.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in bq_xmit_all Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in bq_flush_to_queue Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 6059 Comm: syz.0.51 Not tainted 6.10.0-rc6-syzkaller-01399-g605c96997d89 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:bq_flush_to_queue+0x44/0x610 kernel/bpf/cpumap.c:675 Code: df e8 50 dc d6 ff 49 8d 5e 50 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 a6 b1 39 00 48 8b 2b 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 1d 05 00 00 44 8b 65 00 4d 8d 6e 58 4c RSP: 0018:ffffc90000a18a80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880652a4290 RCX: ffff888073870000 RDX: 0000000080000101 RSI: 0000000000000010 RDI: ffff8880652a4240 RBP: 0000000000000000 R08: ffffffff895a503a R09: 1ffffffff1f5969d R10: dffffc0000000000 R11: fffffbfff1f5969e R12: 0000000000000002 R13: ffffc900037d7820 R14: ffff8880652a4240 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33b5ffff CR3: 000000000e132000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __cpu_map_flush+0x5d/0xd0 kernel/bpf/cpumap.c:767 xdp_do_check_flushed+0x136/0x240 net/core/filter.c:4304 __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:__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 1e d9 6c f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e3 79 d9 f5 65 8b 05 34 b3 77 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc900037d7580 EFLAGS: 00000206 RAX: 35c09d964b24e400 RBX: 1ffff920006faeb4 RCX: ffffffff8172d8aa RDX: dffffc0000000000 RSI: ffffffff8bcabb40 RDI: 0000000000000001 RBP: ffffc900037d7610 R08: ffffffff92f875b7 R09: 1ffffffff25f0eb6 R10: dffffc0000000000 R11: fffffbfff25f0eb7 R12: dffffc0000000000 R13: 1ffff920006faeb0 R14: ffffc900037d75a0 R15: 0000000000000246 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline] debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1019 slab_free_hook mm/slub.c:2163 [inline] slab_free mm/slub.c:4438 [inline] kmem_cache_free+0x10f/0x350 mm/slub.c:4513 vma_lock_free kernel/fork.c:453 [inline] __vm_area_free+0xe0/0x110 kernel/fork.c:509 remove_vma mm/mmap.c:146 [inline] exit_mmap+0x645/0xc80 mm/mmap.c:3365 __mmput+0x115/0x3c0 kernel/fork.c:1346 exit_mm+0x220/0x310 kernel/exit.c:567 do_exit+0x9aa/0x27e0 kernel/exit.c:863 do_group_exit+0x207/0x2c0 kernel/exit.c:1025 get_signal+0x16a1/0x1740 kernel/signal.c:2909 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1530b75b59 Code: Unable to access opcode bytes at 0x7f1530b75b2f. RSP: 002b:00007f153197b0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f1530d05f68 RCX: 00007f1530b75b59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1530d05f68 RBP: 00007f1530d05f60 R08: 00007f153197b6c0 R09: 00007f153197b6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1530d05f6c R13: 000000000000000b R14: 00007ffd94c0c0d0 R15: 00007ffd94c0c1b8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bq_flush_to_queue+0x44/0x610 kernel/bpf/cpumap.c:675 Code: df e8 50 dc d6 ff 49 8d 5e 50 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 a6 b1 39 00 48 8b 2b 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 1d 05 00 00 44 8b 65 00 4d 8d 6e 58 4c RSP: 0018:ffffc90000a18a80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880652a4290 RCX: ffff888073870000 RDX: 0000000080000101 RSI: 0000000000000010 RDI: ffff8880652a4240 RBP: 0000000000000000 R08: ffffffff895a503a R09: 1ffffffff1f5969d R10: dffffc0000000000 R11: fffffbfff1f5969e R12: 0000000000000002 R13: ffffc900037d7820 R14: ffff8880652a4240 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33b5ffff CR3: 000000000e132000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 50 dc d6 ff call 0xffd6dc55 5: 49 8d 5e 50 lea 0x50(%r14),%rbx 9: 48 89 d8 mov %rbx,%rax c: 48 c1 e8 03 shr $0x3,%rax 10: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 15: 74 08 je 0x1f 17: 48 89 df mov %rbx,%rdi 1a: e8 a6 b1 39 00 call 0x39b1c5 1f: 48 8b 2b mov (%rbx),%rbp 22: 48 89 e8 mov %rbp,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 1d 05 00 00 jne 0x553 36: 44 8b 65 00 mov 0x0(%rbp),%r12d 3a: 4d 8d 6e 58 lea 0x58(%r14),%r13 3e: 4c rex.WR Tested on: commit: 605c9699 bpf: relax zero fixed offset constraint on KF.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=146d0ae6980000 kernel config: https://syzkaller.appspot.com/x/.config?x=8defeae77515c9b1 dashboard link: https://syzkaller.appspot.com/bug?extid=707d98c8649695eaf329 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.
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