kernel tried to execute NX-protected page - exploit attempt? (uid: 0) ================================================================== BUG: KASAN: stack-out-of-bounds in __unwind_start+0x36/0x740 arch/x86/kernel/unwind_orc.c:688 ------------[ cut here ]------------ decoded an instruction with an invalid register Write of size 96 at addr ffffc900020cf280 by task syz.2.10/5346 CPU: 0 UID: 0 PID: 5346 Comm: syz.2.10 Not tainted 6.11.0-rc4-next-20240820-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84 __unwind_start+0x36/0x740 arch/x86/kernel/unwind_orc.c:688 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24 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 WARNING: CPU: 1 PID: 5346 at arch/x86/lib/insn-eval.c:516 get_regno arch/x86/lib/insn-eval.c:516 [inline] WARNING: CPU: 1 PID: 5346 at arch/x86/lib/insn-eval.c:516 get_reg_offset+0x335/0x460 arch/x86/lib/insn-eval.c:525 Modules linked in: unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 CPU: 1 UID: 0 PID: 5346 Comm: syz.2.10 Not tainted 6.11.0-rc4-next-20240820-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:get_regno arch/x86/lib/insn-eval.c:516 [inline] RIP: 0010:get_reg_offset+0x335/0x460 arch/x86/lib/insn-eval.c:525 Code: 48 c7 c7 80 51 35 8d 89 ee e8 17 bc 00 00 eb cc e8 10 20 dc f5 c6 05 45 03 4b 04 01 90 48 c7 c7 e0 51 35 8d e8 7c 09 9e f5 90 <0f> 0b 90 90 eb ac 89 d9 80 e1 07 38 c1 0f 8c ef fc ff ff 48 89 df 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_noprof+0x135/0x2a0 mm/slub.c:4092 RSP: 0018:ffffc900020cde30 EFLAGS: 00010046 RAX: f4bed476adc4a800 RBX: 0000000000000008 RCX: ffff888027c88000 new_handle fs/jbd2/transaction.c:461 [inline] jbd2__journal_start+0x14d/0x5d0 fs/jbd2/transaction.c:488 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000008 R08: ffffffff8155acc2 R09: 1ffff1101722519a __ext4_journal_start_sb+0x239/0x600 fs/ext4/ext4_jbd2.c:112 R10: dffffc0000000000 R11: ffffed101722519b R12: dffffc0000000000 R13: 0000000000000000 R14: ffffc900020ce0f0 R15: ffffc900020ce000 FS: 0000555563dfe500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x92/0x110 fs/ext4/inode.c:6008 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000041b58ab3 CR3: 000000002fe12000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mark_inode_dirty+0x325/0xe20 fs/fs-writeback.c:2480 generic_update_time fs/inode.c:2078 [inline] inode_update_time fs/inode.c:2091 [inline] __file_update_time fs/inode.c:2333 [inline] file_update_time+0x3d5/0x450 fs/inode.c:2363 ext4_page_mkwrite+0x207/0xdf0 fs/ext4/inode.c:6129 do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 get_eff_addr_sib+0x1cf/0x560 arch/x86/lib/insn-eval.c:1178 get_addr_ref_64 arch/x86/lib/insn-eval.c:1408 [inline] insn_get_addr_ref+0x593/0xe10 arch/x86/lib/insn-eval.c:1459 do_shared_fault mm/memory.c:5129 [inline] do_fault mm/memory.c:5191 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault+0x12ab/0x67c0 mm/memory.c:5522 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5346 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: 5346 Comm: syz.2.10 Not tainted 6.11.0-rc4-next-20240820-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:ffffc900020cdb10 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: 1ffff11004f91088 RCX: ffffffff81703b60 RDX: 0000000000000000 RSI: ffffffff8c609e00 RDI: ffffffff8c609dc0 RBP: 00000000ffffffff R08: ffffffff9018c76f R09: 1ffffffff20318ed R10: dffffc0000000000 R11: fffffbfff20318ee R12: dffffc0000000000 R13: ffff888027c88444 R14: ffff888027c88000 R15: dffffc0000000000 FS: 0000555563dfe500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000041b58ab3 CR3: 000000002fe12000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __handle_mm_fault mm/memory.c:5665 [inline] handle_mm_fault+0x1029/0x1980 mm/memory.c:5833 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 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 __warn+0x163/0x4e0 kernel/panic.c:739 __report_bug lib/bug.c:199 [inline] report_bug+0x2b3/0x500 lib/bug.c:219 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f575e6591e6 Code: 00 00 00 00 be 08 00 00 00 48 89 df 49 83 c6 01 e8 0f ae fe ff 48 8b 53 38 48 8d 42 f8 48 89 43 38 8b 43 28 83 c0 08 89 43 28 <48> 89 6a f8 45 39 e6 0f 83 7d 00 00 00 48 8b 3c 24 49 8b 6d 30 4a RSP: 002b:00007ffc81f9eb60 EFLAGS: 00010202 RAX: 0000000000003008 RBX: 00007f575f445720 RCX: 0000000000000000 RDX: 0000001b32c1d000 RSI: 0000000000000008 RDI: 00007f575f445720 RBP: ffffffff897f2b55 R08: 00007f575da010c0 R09: 00007f575e902000 R10: 0000000081366c8d R11: 0000000000000007 R12: 00000000000000ea R13: 00007f575e9160f0 R14: 00000000000000be R15: ffffffffffffd000 handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:get_regno arch/x86/lib/insn-eval.c:516 [inline] RIP: 0010:get_reg_offset+0x335/0x460 arch/x86/lib/insn-eval.c:525 Code: 48 c7 c7 80 51 35 8d 89 ee e8 17 bc 00 00 eb cc e8 10 20 dc f5 c6 05 45 03 4b 04 01 90 48 c7 c7 e0 51 35 8d e8 7c 09 9e f5 90 <0f> 0b 90 90 eb ac 89 d9 80 e1 07 38 c1 0f 8c ef fc ff ff 48 89 df RSP: 0018:ffffc900020cde30 EFLAGS: 00010046 RAX: f4bed476adc4a800 RBX: 0000000000000008 RCX: ffff888027c88000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000008 R08: ffffffff8155acc2 R09: 1ffff1101722519a R10: dffffc0000000000 R11: ffffed101722519b R12: dffffc0000000000 R13: 0000000000000000 R14: ffffc900020ce0f0 R15: ffffc900020ce000 The buggy address belongs to stack of task syz.2.10/5346 internal error: frame has invalid marker: 0 The buggy address belongs to the virtual mapping at [ffffc900020c8000, ffffc900020d1000) 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:0xffff888020af6e58 pfn:0x20af6 memcg:ffff888025919582 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff888020af6e58 0000000000000000 00000001ffffffff ffff888025919582 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 5341, tgid 5341 (syz.2.3), ts 64321350903, free_ts 63461060543 get_eff_addr_sib+0x1cf/0x560 arch/x86/lib/insn-eval.c:1178 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 4687 tgid 4687 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 __slab_free+0x31b/0x3d0 mm/slub.c:4432 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: ffffc900020cf180: 00 f2 f2 f2 00 f2 f2 f2 01 f2 00 f3 f3 f3 f3 f3 ffffc900020cf200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900020cf280: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 f3 f3 f3 ^ ffffc900020cf300: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 ffffc900020cf380: f3 f3 f3 f3 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ==================================================================