================================================================== BUG: KASAN: slab-use-after-free in __vma_shareable_lock include/linux/hugetlb.h:1278 [inline] BUG: KASAN: slab-use-after-free in hugetlb_vma_unlock_read mm/hugetlb.c:281 [inline] BUG: KASAN: slab-use-after-free in hugetlb_no_page mm/hugetlb.c:6380 [inline] BUG: KASAN: slab-use-after-free in hugetlb_fault+0xfaf/0x3770 mm/hugetlb.c:6485 Read of size 8 at addr ffff8880216be5f0 by task syz.0.1073/8973 CPU: 0 UID: 0 PID: 8973 Comm: syz.0.1073 Not tainted 6.11.0-rc6-syzkaller-01487-g3cfb5aa10cb7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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 __vma_shareable_lock include/linux/hugetlb.h:1278 [inline] hugetlb_vma_unlock_read mm/hugetlb.c:281 [inline] hugetlb_no_page mm/hugetlb.c:6380 [inline] hugetlb_fault+0xfaf/0x3770 mm/hugetlb.c:6485 handle_mm_fault+0x1901/0x1bc0 mm/memory.c:5830 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 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7fa04c956779 Code: f8 77 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 27 01 00 00 fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 e9 30 01 00 00 66 RSP: 002b:00007fa04d77f7c8 EFLAGS: 00010283 RAX: 0000000000000000 RBX: 00007fa04d77fd30 RCX: 00007fa04cafc160 RDX: 0000000020000000 RSI: 00007fa04c9f0934 RDI: 0000000020000000 RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000073 R13: 00007fa04d77feb0 R14: 0000000020000000 R15: 0000000000000000 Allocated by task 8972: 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:3992 [inline] slab_alloc_node mm/slub.c:4041 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4048 vm_area_alloc+0x24/0x1d0 kernel/fork.c:471 mmap_region+0xc3d/0x2090 mm/mmap.c:2944 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x544/0x720 mm/mmap.c:1514 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 Freed by task 8973: 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+0xe0/0x150 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:2256 [inline] slab_free mm/slub.c:4477 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4552 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 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:3106 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210 remove_vma mm/mmap.c:189 [inline] remove_mt mm/mmap.c:2415 [inline] do_vmi_align_munmap+0x155c/0x18c0 mm/mmap.c:2758 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2830 mmap_region+0x72f/0x2090 mm/mmap.c:2881 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x544/0x720 mm/mmap.c:1514 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 The buggy address belongs to the object at ffff8880216be5d0 which belongs to the cache vm_area_struct of size 184 The buggy address is located 32 bytes inside of freed 184-byte region [ffff8880216be5d0, ffff8880216be688) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x216be memcg:ffff88805f9a6501 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88801bafdb40 ffffea0000bd8c40 dead000000000004 raw: 0000000000000000 0000000000100010 00000001fdffffff ffff88805f9a6501 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6302, tgid 6302 (syz-executor), ts 188063710171, free_ts 188030008587 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2325 allocate_slab+0x5a/0x2f0 mm/slub.c:2488 new_slab mm/slub.c:2541 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3727 __slab_alloc+0x58/0xa0 mm/slub.c:3817 __slab_alloc_node mm/slub.c:3870 [inline] slab_alloc_node mm/slub.c:4029 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4048 vm_area_dup+0x27/0x290 kernel/fork.c:486 dup_mmap kernel/fork.c:695 [inline] dup_mm kernel/fork.c:1672 [inline] copy_mm+0xc7b/0x1f30 kernel/fork.c:1721 copy_process+0x187a/0x3dc0 kernel/fork.c:2374 kernel_clone+0x226/0x8f0 kernel/fork.c:2781 __do_sys_clone kernel/fork.c:2924 [inline] __se_sys_clone kernel/fork.c:2908 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2908 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 7298 tgid 7298 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2667 folios_put_refs+0x76e/0x860 mm/swap.c:1039 free_pages_and_swap_cache+0x2ea/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+0x44f/0xc80 mm/mmap.c:3425 __mmput+0x115/0x390 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x27f0 kernel/exit.c:869 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 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: ffff8880216be480: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 ffff8880216be500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880216be580: 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb ^ ffff8880216be600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880216be680: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 ==================================================================