================================================================== BUG: KASAN: slab-use-after-free in __vma_shareable_lock include/linux/hugetlb.h:1268 [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:6403 [inline] BUG: KASAN: slab-use-after-free in hugetlb_fault+0x21ae/0x2f60 mm/hugetlb.c:6509 Read of size 8 at addr ffff88801a6a4620 by task syz-executor.1/21390 CPU: 1 PID: 21390 Comm: syz-executor.1 Not tainted 6.9.0-rc5-syzkaller-00036-g9d1ddab261f3 #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 __vma_shareable_lock include/linux/hugetlb.h:1268 [inline] hugetlb_vma_unlock_read mm/hugetlb.c:281 [inline] hugetlb_no_page mm/hugetlb.c:6403 [inline] hugetlb_fault+0x21ae/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: 0033:0x7f2897237b31 Code: 01 64 48 8b 04 25 00 00 00 00 48 8d b8 e0 fe ff ff e8 23 96 00 00 85 c0 75 17 48 8b 84 24 18 01 00 00 48 8b b4 24 30 01 00 00 <48> 89 b0 00 00 00 20 64 f0 83 2c 25 a8 ff ff ff 01 eb 56 48 8d ac RSP: 002b:00007f28974cfae0 EFLAGS: 00010246 RAX: 0000000000000240 RBX: 0000000000000001 RCX: fffffffffffffeff RDX: ebd2bce8fbec6c78 RSI: 0000000020000100 RDI: 000055558aa4d360 RBP: 00007f28973ac050 R08: 00007f2897200000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000001 R12: 00007f28974cfc90 R13: 0000000000000001 R14: ffffffffffffffff R15: 00007f2897234cb0 Allocated by task 21395: 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_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: 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_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88801a6a4600 which belongs to the cache vm_area_struct of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff88801a6a4600, ffff88801a6a46c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a6a4 memcg:ffff88807b3ddc01 anon flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000800 ffff888015eeab40 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff88807b3ddc01 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 5177, tgid -1771900602 (syz-executor.1), ts 5177, free_ts 1179257768594 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_sys_clone kernel/fork.c:2940 [inline] __se_sys_clone kernel/fork.c:2924 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2924 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 15421 tgid 15413 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 get_signal+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 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+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88801a6a4500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801a6a4580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88801a6a4600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801a6a4680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801a6a4700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================