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Message-ID: <0000000000003c9dd1061dbaa236@google.com> Date: Sat, 20 Jul 2024 21:48:03 -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: 0 PID: 6250 Comm: syz.0.140 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #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 b0 d8 d6 ff 49 8d 5e 50 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 d6 cd 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:ffffc90000007a80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807e7fb910 RCX: ffff888020138000 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff88807e7fb8c0 RBP: 0000000000000000 R08: ffffffff895fbdfa R09: 1ffffffff1f5d135 R10: dffffc0000000000 R11: fffffbfff1f5d136 R12: 0000000000000001 R13: ffffc900030277c0 R14: ffff88807e7fb8c0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ca5ffff CR3: 0000000049242000 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:unwind_next_frame+0x677/0x2a00 arch/x86/kernel/unwind_orc.c:495 Code: 24 08 48 c7 c0 6c 55 bb 8f 48 29 c3 48 c7 c1 a8 75 2c 90 48 c1 fb 02 4c 8d 3c 5b 4d 01 ff 49 01 cf 0f 84 82 00 00 00 49 89 ee <e8> f4 34 52 00 49 8d 6f 04 49 8d 5f 05 48 89 e8 48 c1 e8 03 42 0f RSP: 0018:ffffc900030272a8 EFLAGS: 00000286 RAX: ffffffff81410c9e RBX: 0000000000000000 RCX: ffffffff903ce67e RDX: 0000000000000000 RSI: ffffffff81eac064 RDI: ffffffff81eabf32 RBP: 1ffff92000604e70 R08: ffffffff81410c60 R09: ffffc90003027470 R10: 0000000000000003 R11: ffffffff817ee9a0 R12: ffffffff8fc64b50 R13: dffffc0000000000 R14: 1ffff92000604e70 R15: ffffffff903ce67e arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2235 [inline] slab_free mm/slub.c:4464 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4539 vma_lock_free kernel/fork.c:455 [inline] __vm_area_free+0xe0/0x110 kernel/fork.c:511 remove_vma mm/mmap.c:146 [inline] exit_mmap+0x645/0xc80 mm/mmap.c:3365 __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: 0033:0x7f389ef75b59 Code: Unable to access opcode bytes at 0x7f389ef75b2f. RSP: 002b:00007f389fd440f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f389f105f68 RCX: 00007f389ef75b59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f389f105f68 RBP: 00007f389f105f60 R08: 00007f389fd446c0 R09: 00007f389fd446c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f389f105f6c R13: 000000000000000b R14: 00007ffd4ff20a20 R15: 00007ffd4ff20b08 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bq_flush_to_queue+0x44/0x610 kernel/bpf/cpumap.c:675 Code: df e8 b0 d8 d6 ff 49 8d 5e 50 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 d6 cd 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:ffffc90000007a80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807e7fb910 RCX: ffff888020138000 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff88807e7fb8c0 RBP: 0000000000000000 R08: ffffffff895fbdfa R09: 1ffffffff1f5d135 R10: dffffc0000000000 R11: fffffbfff1f5d136 R12: 0000000000000001 R13: ffffc900030277c0 R14: ffff88807e7fb8c0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ca5ffff CR3: 0000000049242000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 b0 d8 d6 ff call 0xffd6d8b5 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 d6 cd 39 00 call 0x39cdf5 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: 2c9b3512 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16870195980000 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 Note: no patches were applied.
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