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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:12c1:b0:385:ffe:4516 with SMTP id e9e14a558f8ab-398e4db86a7mr4396995ab.2.1721649662850; Mon, 22 Jul 2024 05:01:02 -0700 (PDT) Date: Mon, 22 Jul 2024 05:01:02 -0700 In-Reply-To: <20240722114035.5337-1-aha310510@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000950db2061dd4ccd9@google.com> Subject: Re: [syzbot] [bpf?] [net?] general protection fault in __dev_flush From: syzbot To: aha310510@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: stack-out-of-bounds Read in xdp_do_check_flushed ================================================================== BUG: KASAN: stack-out-of-bounds in bpf_net_ctx_get_all_used_flush_lists include/linux/filter.h:837 [inline] BUG: KASAN: stack-out-of-bounds in xdp_do_check_flushed+0x355/0x3f0 net/core/filter.c:4298 Read of size 4 at addr ffffc9000336fa50 by task syz.0.70/5863 CPU: 1 PID: 5863 Comm: syz.0.70 Not tainted 6.10.0-syzkaller-11323-g7846b618e0a4-dirty #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 bpf_net_ctx_get_all_used_flush_lists include/linux/filter.h:837 [inline] xdp_do_check_flushed+0x355/0x3f0 net/core/filter.c:4298 __napi_poll.constprop.0+0xd1/0x550 net/core/dev.c:6774 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6962 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__schedule+0xe3f/0x5490 kernel/sched/core.c:6399 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 ba 3f 00 00 48 8b bd 10 ff ff ff 4d 89 77 10 4c 89 f6 e8 b9 6e 0f f6 48 89 c7 e8 71 e8 69 f6 <48> 8b 8d a0 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 01 c1 48 c7 RSP: 0018:ffffc9000336f980 EFLAGS: 00000206 RAX: 000000000000018b RBX: ffff8880256b0000 RCX: 1ffffffff1fce461 RDX: 0000000000000000 RSI: ffffffff8b2cbac0 RDI: ffffffff8b909e40 RBP: ffffc9000336fb10 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8fe7675f R11: 0000000000000001 R12: ffff88806b13f788 R13: 0000000000000000 R14: ffff8880256b0000 R15: ffff88806b13ec80 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6708 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 class_preempt_destructor include/linux/preempt.h:480 [inline] class_preempt_destructor include/linux/preempt.h:480 [inline] try_to_wake_up+0xc08/0x13e0 kernel/sched/core.c:4022 wake_up_process kernel/sched/core.c:4299 [inline] wake_up_q+0x91/0x140 kernel/sched/core.c:1029 futex_wake+0x43e/0x4e0 kernel/futex/waitwake.c:199 do_futex+0x1e5/0x350 kernel/futex/syscalls.c:107 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex kernel/futex/syscalls.c:160 [inline] __x64_sys_futex+0x1e1/0x4c0 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc830f75b59 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc831d8e0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fc831105f68 RCX: 00007fc830f75b59 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc831105f6c RBP: 00007fc831105f60 R08: 00007fc831d8f080 R09: 00007fc831d8e6c0 R10: 0000000000000e80 R11: 0000000000000246 R12: 00007fc831105f6c R13: 000000000000000b R14: 00007ffea9d2b330 R15: 00007ffea9d2b418 The buggy address belongs to stack of task syz.0.70/5863 and is located at offset 40 in frame: __schedule+0x0/0x5490 This frame has 3 objects: [48, 52) 'cid' [64, 80) 'rf' [96, 120) 'ac' The buggy address belongs to the virtual mapping at [ffffc90003368000, ffffc90003371000) created by: kernel_clone+0xfd/0x980 kernel/fork.c:2780 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802b714360 pfn:0x2b714 memcg:ffff888021296f02 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff88802b714360 0000000000000000 00000001ffffffff ffff888021296f02 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 5862, tgid 5862 (syz.0.70), ts 130256428069, free_ts 129532353425 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265 vm_area_alloc_pages mm/vmalloc.c:3583 [inline] __vmalloc_area_node mm/vmalloc.c:3659 [inline] __vmalloc_node_range_noprof+0xa6a/0x1520 mm/vmalloc.c:3840 alloc_thread_stack_node kernel/fork.c:311 [inline] dup_task_struct kernel/fork.c:1111 [inline] copy_process+0x2f3b/0x8de0 kernel/fork.c:2203 kernel_clone+0xfd/0x980 kernel/fork.c:2780 __do_sys_clone3+0x1f5/0x270 kernel/fork.c:3084 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5829 tgid 5828 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588 tlb_batch_list_free mm/mmu_gather.c:159 [inline] tlb_finish_mmu+0x237/0x7b0 mm/mmu_gather.c:468 exit_mmap+0x3d1/0xb20 mm/mmap.c:3354 __mmput+0x12a/0x480 kernel/fork.c:1343 mmput+0x62/0x70 kernel/fork.c:1365 exit_mm kernel/exit.c:566 [inline] do_exit+0x9bf/0x2bb0 kernel/exit.c:864 do_group_exit+0xd3/0x2a0 kernel/exit.c:1026 get_signal+0x25fb/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 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+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffffc9000336f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000336f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000336fa00: 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 00 f2 ^ ffffc9000336fa80: f2 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 ffffc9000336fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: fa cli 1: 48 c1 ea 03 shr $0x3,%rdx 5: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 9: 0f 85 ba 3f 00 00 jne 0x3fc9 f: 48 8b bd 10 ff ff ff mov -0xf0(%rbp),%rdi 16: 4d 89 77 10 mov %r14,0x10(%r15) 1a: 4c 89 f6 mov %r14,%rsi 1d: e8 b9 6e 0f f6 call 0xf60f6edb 22: 48 89 c7 mov %rax,%rdi 25: e8 71 e8 69 f6 call 0xf669e89b * 2a: 48 8b 8d a0 fe ff ff mov -0x160(%rbp),%rcx <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 01 c1 add %rax,%rcx 3e: 48 rex.W 3f: c7 .byte 0xc7 Tested on: commit: 7846b618 Merge tag 'rtc-6.11' of git://git.kernel.org/.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=11d729b5980000 kernel config: https://syzkaller.appspot.com/x/.config?x=be4129de17851dbe dashboard link: https://syzkaller.appspot.com/bug?extid=44623300f057a28baf1e compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=148939c3980000