================================================================== BUG: KASAN: stack-out-of-bounds in insn_init arch/x86/lib/insn.c:70 [inline] BUG: KASAN: stack-out-of-bounds in insn_decode+0x51/0x4c0 arch/x86/lib/insn.c:758 Write of size 88 at addr ffffc900041b7410 by task syz.3.43/5499 Oops: general protection fault, probably for non-canonical address 0xdfff0c60ffffff09: 0000 [#2] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 5499 Comm: syz.3.43 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0 CPU: 1 UID: 0 PID: 5499 Comm: syz.3.43 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: RIP: 1020:0xfffffffd Code: Unable to access opcode bytes at 0xffffffd3. __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 RSP: 1060:ffffffffffffffff EFLAGS: 8bb6e90100000000 ORIG_RAX: ffffc900041b6430 RAX: 1ffff92000836c70 RBX: 58b5b74704c4f300 RCX: ffffc900041b65ee RDX: ffffc900041b6674 RSI: 0000000045e0360e RDI: ffffffff8e0aa2fb RBP: ffffc900841b6673 R08: 0000000000000000 R09: ffffc900041b65f4 R10: ffffc900041b6428 R11: ffffc900041b6677 R12: ffffc900041b6420 R13: dffffc0000000000 R14: ffff1060ffffff09 R15: ffffffff8bb6b70d FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: ff09 DS: 0000 ES: 0018 CR0: ffffc900041b65ed CR2: ffffffff81fc4903 CR3: ffffc900041b61a0 CR4: 0000000000000000 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 BUG: unable to handle page fault for address: ffffc900841b65eb #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 15800067 P4D 15800067 PUD 0 Oops: Oops: 0010 [#3] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 5499 Comm: syz.3.43 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0 kasan_report+0x143/0x180 mm/kasan/report.c:601 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 6230:0xffff1060ffffff09 Code: Unable to access opcode bytes at 0xffff1060fffffedf. RSP: 0000:00000000fffffff8 EFLAGS: ffffffff8bb6f3ee kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 ORIG_RAX: ffffc900041b61a0 RAX: ffffffff8c0d4a0a RBX: ffffc900041b61a0 RCX: 0000000000000000 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84 RDX: ffffc900041b65f8 RSI: 0000000000000082 RDI: 0000000000000082 RBP: 01fffc0000000000 R08: 0000000000000018 R09: 1ffff1101722519a insn_init arch/x86/lib/insn.c:70 [inline] insn_decode+0x51/0x4c0 arch/x86/lib/insn.c:758 R10: dffffc0000000000 R11: ffffed101722519b R12: ffff1060ffffff09 R13: ffffc900041b6230 R14: ffffffff8bb6f3ee R15: 00000000fffffff8 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 6230 DS: 0000 ES: 0000 CR0: 0000000080050033 get_kernel_gp_address arch/x86/kernel/traps.c:558 [inline] __exc_general_protection arch/x86/kernel/traps.c:733 [inline] exc_general_protection+0x454/0x5d0 arch/x86/kernel/traps.c:693 CR2: ffffc900841b65eb CR3: 000000000e736000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: RIP: 0010:clear_pending kernel/locking/qspinlock.c:151 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:435 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x830/0xdb0 kernel/locking/qspinlock.c:508 Code: e9 6e ff ff ff 48 8d 8c 24 b0 00 00 00 80 e1 07 fe c1 38 c1 7c 97 48 8d bc 24 b0 00 00 00 e8 87 e3 34 f6 eb 88 48 8b 44 24 10 <42> 0f b6 04 28 84 c0 0f 85 d3 00 00 00 4c 8b 64 24 48 41 c6 04 24 RSP: 0018:ffffc900041b75e0 EFLAGS: 00010056 RAX: ffffc900041b7600 RBX: 1ffff92000836ed2 RCX: ffffc900041b7601 RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff8880b903ea42 RBP: ffffc900041b7718 R08: ffff8880b903ea43 R09: 1ffff11017207d48 R10: dffffc0000000000 R11: ffffed1017207d49 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880b903ea40 R15: ffffc900041b76a0 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5499 at kernel/rcu/tree_plugin.h:442 __rcu_read_unlock+0x94/0x110 kernel/rcu/tree_plugin.h:442 Modules linked in: CPU: 1 UID: 0 PID: 5499 Comm: syz.3.43 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__rcu_read_unlock+0x94/0x110 kernel/rcu/tree_plugin.h:442 Code: 41 83 3f 00 75 29 42 0f b6 04 23 84 c0 75 62 41 8b 45 00 3d 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 <0f> 0b 90 eb eb 4c 89 f7 e8 7f 00 00 00 eb cd 44 89 e9 80 e1 07 80 RSP: 0018:ffffc900041b5bc0 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: 1ffff110035fc088 RCX: ffffffff81703af0 RDX: 0000000000000000 RSI: ffffffff8c609d80 RDI: ffffffff8c609d40 RBP: 00000000ffffffff R08: ffffffff901c0c6f R09: 1ffffffff203818d R10: dffffc0000000000 R11: fffffbfff203818e R12: dffffc0000000000 R13: ffff88801afe0444 R14: ffff88801afe0000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc900841b65eb CR3: 000000000e736000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [inline] queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x272/0x370 kernel/locking/spinlock_debug.c:116 rcu_read_unlock include/linux/rcupdate.h:882 [inline] is_bpf_text_address+0x285/0x2a0 kernel/bpf/core.c:769 kernel_text_address+0xa7/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x40 kernel/extable.c:79 show_trace_log_lvl+0x2ed/0x410 arch/x86/kernel/dumpstack.c:259 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:595 show_regs arch/x86/kernel/dumpstack.c:478 [inline] __die_body+0x5f/0xb0 arch/x86/kernel/dumpstack.c:420 page_fault_oops+0x8e4/0xcc0 arch/x86/mm/fault.c:711 raw_spin_rq_lock kernel/sched/sched.h:1488 [inline] rq_lock kernel/sched/sched.h:1787 [inline] __schedule+0x354/0x4b30 kernel/sched/core.c:6587 __bad_area_nosemaphore+0x118/0x770 arch/x86/mm/fault.c:785 do_task_dead+0xc4/0xd0 kernel/sched/core.c:6693 do_exit+0x1f7f/0x28e0 kernel/exit.c:990 handle_page_fault arch/x86/mm/fault.c:1479 [inline] exc_page_fault+0x5c8/0x8c0 arch/x86/mm/fault.c:1539 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x176f/0x1810 kernel/signal.c:2936 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 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: 0033:0x7f1f40d79e79 Code: Unable to access opcode bytes at 0x7f1f40d79e4f. RSP: 002b:00007f1f407ff0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f1f40f16060 RCX: 00007f1f40d79e79 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1f40f16060 RBP: 00007f1f40f16058 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1f40f16064 R13: 0000000000000000 R14: 00007ffd2f066270 R15: 00007ffd2f066358 The buggy address belongs to stack of task syz.3.43/5499 internal error: frame has invalid marker: 18446744071595369491 The buggy address belongs to the virtual mapping at [ffffc900041b0000, ffffc900041b9000) created by: copy_process+0x5d1/0x3d50 kernel/fork.c:2206 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807aa9be58 pfn:0x7aa9b flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff88807aa9be58 0000000000000000 00000001ffffffff 0000000000000000 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 5327, tgid 5327 (syz.4.8), ts 61522925700, free_ts 61520570788 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517 prep_new_page mm/page_alloc.c:1525 [inline] get_page_from_freelist+0x3004/0x30c0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 vm_area_alloc_pages mm/vmalloc.c:3600 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0xa40/0x1400 mm/vmalloc.c:3850 alloc_thread_stack_node kernel/fork.c:314 [inline] dup_task_struct+0x444/0x8c0 kernel/fork.c:1115 copy_process+0x5d1/0x3d50 kernel/fork.c:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2787 __do_sys_clone3 kernel/fork.c:3091 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3070 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 4684 tgid 4684 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1098 [inline] free_unref_page+0xc07/0xd90 mm/page_alloc.c:2651 discard_slab mm/slub.c:2630 [inline] __put_partials+0xeb/0x130 mm/slub.c:3098 put_cpu_partial+0x17c/0x250 mm/slub.c:3173 __slab_free+0x2ea/0x3d0 mm/slub.c:4391 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4085 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4128 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667 netlink_sendmsg+0x638/0xcb0 net/netlink/af_netlink.c:1876 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 ___sys_sendmsg net/socket.c:2651 [inline] __sys_sendmsg+0x298/0x390 net/socket.c:2680 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffffc900041b7300: 01 f2 00 02 f2 f2 00 02 00 00 00 00 00 00 00 00 ffffc900041b7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900041b7400: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ^ ffffc900041b7480: 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900041b7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: e9 6e ff ff ff jmp 0xffffff73 5: 48 8d 8c 24 b0 00 00 lea 0xb0(%rsp),%rcx c: 00 d: 80 e1 07 and $0x7,%cl 10: fe c1 inc %cl 12: 38 c1 cmp %al,%cl 14: 7c 97 jl 0xffffffad 16: 48 8d bc 24 b0 00 00 lea 0xb0(%rsp),%rdi 1d: 00 1e: e8 87 e3 34 f6 call 0xf634e3aa 23: eb 88 jmp 0xffffffad 25: 48 8b 44 24 10 mov 0x10(%rsp),%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 d3 00 00 00 jne 0x10a 37: 4c 8b 64 24 48 mov 0x48(%rsp),%r12 3c: 41 rex.B 3d: c6 .byte 0xc6 3e: 04 24 add $0x24,%al