================================================================== BUG: KASAN: slab-use-after-free in is_vm_hugetlb_page include/linux/hugetlb_inline.h:11 [inline] BUG: KASAN: slab-use-after-free in vma_resv_map mm/hugetlb.c:1150 [inline] BUG: KASAN: slab-use-after-free in __vma_reservation_common+0xc9/0x7d0 mm/hugetlb.c:2827 Read of size 8 at addr ffff88807ea2c920 by task syz-executor.2/25054 CPU: 1 PID: 25054 Comm: syz-executor.2 Not tainted 6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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 is_vm_hugetlb_page include/linux/hugetlb_inline.h:11 [inline] vma_resv_map mm/hugetlb.c:1150 [inline] __vma_reservation_common+0xc9/0x7d0 mm/hugetlb.c:2827 vma_needs_reservation mm/hugetlb.c:2901 [inline] restore_reserve_on_error+0x39/0x1d0 mm/hugetlb.c:2951 hugetlb_no_page mm/hugetlb.c:6411 [inline] hugetlb_fault+0x17d4/0x2f60 mm/hugetlb.c:6509 handle_mm_fault+0x711/0x8a0 mm/memory.c:5604 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x446/0x8e0 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0023:0xf733ed08 Code: f8 09 f0 74 1d 89 f0 83 f0 01 09 f8 0f 85 3c 02 00 00 8b 44 24 20 0f c8 89 44 24 20 31 c0 89 44 24 24 8b 44 24 1c 8b 4c 24 20 <89> 08 e9 39 fb ff ff 0f b6 4c 24 08 8b 5c 24 28 89 cf c1 ef 05 83 RSP: 002b:00000000f75c4a80 EFLAGS: 00010246 RAX: 00000000200008c0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 25058: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x174/0x340 mm/slub.c:3852 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 mmap_region+0xd64/0x1e50 mm/mmap.c:2807 do_mmap+0x7af/0xe60 mm/mmap.c:1385 vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573 ksys_mmap_pgoff+0x53c/0x6e0 mm/mmap.c:1431 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb8/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 25059: 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+0xa6/0xe0 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:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:4344 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471 __do_softirq+0x2c6/0x980 kernel/softirq.c:554 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:2734 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2289 [inline] do_vmi_align_munmap+0x15a7/0x1930 mm/mmap.c:2632 do_vmi_munmap+0x24e/0x2d0 mm/mmap.c:2696 mmap_region+0x6af/0x1e50 mm/mmap.c:2747 do_mmap+0x7af/0xe60 mm/mmap.c:1385 vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573 ksys_mmap_pgoff+0x53c/0x6e0 mm/mmap.c:1431 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb8/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff88807ea2c900 which belongs to the cache vm_area_struct of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff88807ea2c900, ffff88807ea2c9c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ea2c memcg:ffff888064b89301 flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000800 ffff888015eeab40 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff888064b89301 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 24446, tgid -830430804 (syz-executor.4), ts 24446, free_ts 1133019311697 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x252/0x340 mm/slub.c:3852 vm_area_dup+0x27/0x290 kernel/fork.c:482 dup_mmap kernel/fork.c:697 [inline] dup_mm kernel/fork.c:1688 [inline] copy_mm+0xd7f/0x2180 kernel/fork.c:1737 copy_process+0x187a/0x3df0 kernel/fork.c:2390 kernel_clone+0x226/0x8f0 kernel/fork.c:2797 __do_compat_sys_ia32_clone arch/x86/kernel/sys_ia32.c:254 [inline] __se_compat_sys_ia32_clone arch/x86/kernel/sys_ia32.c:240 [inline] __ia32_compat_sys_ia32_clone+0x255/0x2a0 arch/x86/kernel/sys_ia32.c:240 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb8/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e page last free pid 25044 tgid 25044 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x986/0xab0 mm/page_alloc.c:2347 free_unref_folios+0x185/0xb30 mm/page_alloc.c:2536 folios_put_refs+0x8eb/0xa10 mm/swap.c:1034 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x4bb/0xd60 mm/mmap.c:3280 __mmput+0x115/0x3c0 kernel/fork.c:1346 exit_mm+0x220/0x310 kernel/exit.c:569 do_exit+0x99e/0x27e0 kernel/exit.c:865 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __ia32_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb8/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Memory state around the buggy address: ffff88807ea2c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807ea2c880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88807ea2c900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ea2c980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88807ea2ca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: f8 clc 1: 09 f0 or %esi,%eax 3: 74 1d je 0x22 5: 89 f0 mov %esi,%eax 7: 83 f0 01 xor $0x1,%eax a: 09 f8 or %edi,%eax c: 0f 85 3c 02 00 00 jne 0x24e 12: 8b 44 24 20 mov 0x20(%rsp),%eax 16: 0f c8 bswap %eax 18: 89 44 24 20 mov %eax,0x20(%rsp) 1c: 31 c0 xor %eax,%eax 1e: 89 44 24 24 mov %eax,0x24(%rsp) 22: 8b 44 24 1c mov 0x1c(%rsp),%eax 26: 8b 4c 24 20 mov 0x20(%rsp),%ecx * 2a: 89 08 mov %ecx,(%rax) <-- trapping instruction 2c: e9 39 fb ff ff jmp 0xfffffb6a 31: 0f b6 4c 24 08 movzbl 0x8(%rsp),%ecx 36: 8b 5c 24 28 mov 0x28(%rsp),%ebx 3a: 89 cf mov %ecx,%edi 3c: c1 ef 05 shr $0x5,%edi 3f: 83 .byte 0x83