kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffff8881cb33b400 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation PGD 7801067 P4D 7801067 PUD 1e1cca063 PMD 1cb32c063 PTE 80000001cb33b163 Oops: 0011 [#1] PREEMPT SMP KASAN CPU: 0 PID: 2649 Comm: syz-executor Not tainted 5.4.289-syzkaller-00011-g39762b7a60e9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:0xffff8881cb33b400 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 90 b1 33 cb 81 88 ff ff a0 9b 05 85 ff ff ff ff <01> 00 00 00 00 00 00 00 08 bb 33 cb 81 88 ff ff 28 be 33 cb 81 88 RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202 RAX: ffffffff8154e8aa RBX: 0000000000000101 RCX: ffff8881e9facec0 RDX: 0000000080000101 RSI: ffff8881cb33b400 RDI: ffff8881cb33b1c0 RBP: ffff8881f6e09ec8 R08: ffffffff8154e4ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa568 R13: dffffc0000000000 R14: ffff8881cb33b400 R15: ffff8881cb33b1c0 FS: 000055557a264500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8881cb33b400 CR3: 00000001ea888000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:27 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:49 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:175 [inline] RIP: 0010:unwind_next_frame+0x612/0x1ea0 arch/x86/kernel/unwind_orc.c:438 Code: e8 3f 48 01 c8 48 83 e0 fe 49 8d 5c 45 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 48 63 03 <48> 01 d8 48 8d 4b 04 4c 39 e0 4c 0f 46 e9 48 8d 43 fc 4c 0f 47 f8 RSP: 0018:ffff8881f24f7560 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: fffffffffd0880f7 RBX: ffffffff866e581c RCX: dffffc0000000000 RDX: ffffffff866e5810 RSI: ffffffff86a7a71e RDI: ffffffff812fbdbc RBP: ffff8881f24f7850 R08: 0000000000000008 R09: ffff8881f24f78b0 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8376d9c3 R13: ffffffff866e5810 R14: ffffffff866e5810 R15: ffffffff866e582c arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 __d_alloc+0x2a/0x6a0 fs/dcache.c:1695 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1824 alloc_file_pseudo+0x131/0x2f0 fs/file_table.c:226 sock_alloc_file+0xb4/0x230 net/socket.c:398 sock_map_fd net/socket.c:421 [inline] __sys_socket+0x194/0x370 net/socket.c:1524 __do_sys_socket net/socket.c:1529 [inline] __se_sys_socket net/socket.c:1527 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1527 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f94c29f0d07 Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 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:00007ffc65377f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f94c2a70c5b RCX: 00007f94c29f0d07 RDX: 0000000000000000 RSI: 0000000000080002 RDI: 0000000000000001 RBP: 00007ffc65377f30 R08: 0000000000000008 R09: 00007ffc65377f62 R10: 0000000000000026 R11: 0000000000000246 R12: 00007ffc65377fb0 R13: 00007f94c2a70c5b R14: 0000000000000009 R15: 0000000000000000 Modules linked in: CR2: ffff8881cb33b400 ---[ end trace e283bd6c889f3246 ]--- RIP: 0010:0xffff8881cb33b400 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 90 b1 33 cb 81 88 ff ff a0 9b 05 85 ff ff ff ff <01> 00 00 00 00 00 00 00 08 bb 33 cb 81 88 ff ff 28 be 33 cb 81 88 RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202 RAX: ffffffff8154e8aa RBX: 0000000000000101 RCX: ffff8881e9facec0 RDX: 0000000080000101 RSI: ffff8881cb33b400 RDI: ffff8881cb33b1c0 RBP: ffff8881f6e09ec8 R08: ffffffff8154e4ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa568 R13: dffffc0000000000 R14: ffff8881cb33b400 R15: ffff8881cb33b1c0 FS: 000055557a264500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8881cb33b400 CR3: 00000001ea888000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: e8 3f 48 01 c8 call 0xc8014844 5: 48 83 e0 fe and $0xfffffffffffffffe,%rax 9: 49 8d 5c 45 00 lea 0x0(%r13,%rax,2),%rbx e: 48 89 d8 mov %rbx,%rax 11: 48 c1 e8 03 shr $0x3,%rax 15: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 1c: fc ff df 1f: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax 23: 84 c0 test %al,%al 25: 75 27 jne 0x4e 27: 48 63 03 movslq (%rbx),%rax * 2a: 48 01 d8 add %rbx,%rax <-- trapping instruction 2d: 48 8d 4b 04 lea 0x4(%rbx),%rcx 31: 4c 39 e0 cmp %r12,%rax 34: 4c 0f 46 e9 cmovbe %rcx,%r13 38: 48 8d 43 fc lea -0x4(%rbx),%rax 3c: 4c 0f 47 f8 cmova %rax,%r15