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Message-ID: <0000000000005586b6061dc21492@google.com> Date: Sun, 21 Jul 2024 06:41:02 -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 __dev_flush bq->count = 0 Oops: general protection fault, probably for non-canonical address 0xdffffc0003fffe01: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: probably user-memory-access in range [0x000000001ffff008-0x000000001ffff00f] CPU: 1 PID: 6644 Comm: syz.0.358 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:__list_del include/linux/list.h:195 [inline] RIP: 0010:__list_del_clearprev include/linux/list.h:209 [inline] RIP: 0010:__dev_flush+0xe4/0x160 kernel/bpf/devmap.c:430 Code: b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 49 89 c5 74 08 48 89 df e8 0a 80 3a 00 48 8b 2b 48 8d 5d 08 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 dd 80 3a 00 4c 89 23 4c 89 e0 48 RSP: 0018:ffffc90000a18af0 EFLAGS: 00010202 RAX: 0000000003fffe01 RBX: 000000001ffff008 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802e31a120 RBP: 000000001ffff000 R08: ffff88802e31a11f R09: 0000000000000000 R10: ffff88802e31a110 R11: ffffed1005c63424 R12: 0000000020000000 R13: dffffc0000000000 R14: ffff88802e31a100 R15: 1ffff11005c63420 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc38d06030 CR3: 000000002d8c8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> 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 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:page_ext_get+0x5/0x2a0 mm/page_ext.c:518 Code: f1 49 91 ff 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 <41> 57 41 56 41 54 53 48 89 fb e8 bc 49 91 ff e8 57 40 78 ff 4c 8d RSP: 0018:ffffc90003d6f378 EFLAGS: 00000283 RAX: 0000001e5a5649e6 RBX: ffffea00019ecd00 RCX: 0000001f7035090d RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea00019ecd00 RBP: 0000000000000000 R08: ffffea00019ecd37 R09: 1ffffd400033d9a6 R10: dffffc0000000000 R11: fffff9400033d9a7 R12: 0000000000000005 R13: ffffea00019ecd00 R14: 0000000000000000 R15: 0000000000000000 __reset_page_owner+0x2f/0x3f0 mm/page_owner.c:290 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_folios+0xf12/0x19c0 mm/page_alloc.c:2637 folios_put_refs+0x93a/0xa60 mm/swap.c:1024 folios_put include/linux/mm.h:1572 [inline] folio_batch_move_lru+0x5d7/0x690 mm/swap.c:227 lru_add_drain_cpu+0x10e/0x8c0 mm/swap.c:657 lru_add_drain+0x123/0x3e0 mm/swap.c:757 exit_mmap+0x22b/0xc80 mm/mmap.c:3336 __mmput+0x115/0x380 kernel/fork.c:1343 exit_mm+0x220/0x310 kernel/exit.c:566 do_exit+0x9b2/0x27f0 kernel/exit.c:864 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 get_signal+0x16a1/0x1740 kernel/signal.c:2917 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+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efc38b75b59 Code: Unable to access opcode bytes at 0x7efc38b75b2f. RSP: 002b:00007efc385ff0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007efc38d05f68 RCX: 00007efc38b75b59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007efc38d05f68 RBP: 00007efc38d05f60 R08: 00007efc385ff6c0 R09: 00007efc385ff6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007efc38d05f6c R13: 000000000000000b R14: 00007fff8a519330 R15: 00007fff8a519418 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del include/linux/list.h:195 [inline] RIP: 0010:__list_del_clearprev include/linux/list.h:209 [inline] RIP: 0010:__dev_flush+0xe4/0x160 kernel/bpf/devmap.c:430 Code: b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 49 89 c5 74 08 48 89 df e8 0a 80 3a 00 48 8b 2b 48 8d 5d 08 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 dd 80 3a 00 4c 89 23 4c 89 e0 48 RSP: 0018:ffffc90000a18af0 EFLAGS: 00010202 RAX: 0000000003fffe01 RBX: 000000001ffff008 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802e31a120 RBP: 000000001ffff000 R08: ffff88802e31a11f R09: 0000000000000000 R10: ffff88802e31a110 R11: ffffed1005c63424 R12: 0000000020000000 R13: dffffc0000000000 R14: ffff88802e31a100 R15: 1ffff11005c63420 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc38d06030 CR3: 000000002d8c8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff (bad) 8: df 41 80 filds -0x80(%rcx) b: 7c 05 jl 0x12 d: 00 00 add %al,(%rax) f: 49 89 c5 mov %rax,%r13 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 0a 80 3a 00 call 0x3a8026 1c: 48 8b 2b mov (%rbx),%rbp 1f: 48 8d 5d 08 lea 0x8(%rbp),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 dd 80 3a 00 call 0x3a8116 39: 4c 89 23 mov %r12,(%rbx) 3c: 4c 89 e0 mov %r12,%rax 3f: 48 rex.W Tested on: commit: 2c9b3512 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=103033fd980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4925140c45a2a50 dashboard link: https://syzkaller.appspot.com/bug?extid=707d98c8649695eaf329 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=13eae521980000
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