================================================================== 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:2806 Read of size 8 at addr ffff88805f2e99d0 by task syz-executor.4/15694 CPU: 0 PID: 15694 Comm: syz-executor.4 Not tainted 6.9.0-rc4-next-20240418-syzkaller #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:2806 vma_needs_reservation mm/hugetlb.c:2880 [inline] restore_reserve_on_error+0x39/0x1d0 mm/hugetlb.c:2930 hugetlb_no_page mm/hugetlb.c:6393 [inline] hugetlb_fault+0x23b4/0x3890 mm/hugetlb.c:6489 handle_mm_fault+0x18e8/0x1bb0 mm/memory.c:5663 do_user_addr_fault arch/x86/mm/fault.c:1369 [inline] handle_page_fault arch/x86/mm/fault.c:1512 [inline] exc_page_fault+0x459/0x900 arch/x86/mm/fault.c:1570 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f6639e37b31 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:00007ffef196b9f0 EFLAGS: 00010246 RAX: 0000000000000240 RBX: 0000000000000001 RCX: fffffffffffffeff RDX: cb77cc19e04d9a7b RSI: 0000000020000100 RDI: 0000555573f5e360 RBP: 00007f6639fac050 R08: 00007f6639e00000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000001 R12: 00007ffef196bba0 R13: 0000000000000001 R14: ffffffffffffffff R15: 00007f6639e34cb0 Allocated by task 15696: 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:3897 [inline] slab_alloc_node mm/slub.c:3957 [inline] kmem_cache_alloc_noprof+0x135/0x290 mm/slub.c:3964 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 mmap_region+0xc47/0x2060 mm/mmap.c:2873 do_mmap+0x8ad/0xfa0 mm/mmap.c:1397 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573 ksys_mmap_pgoff+0x544/0x720 mm/mmap.c:1443 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 24: 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:2190 [inline] slab_free mm/slub.c:4393 [inline] kmem_cache_free+0x145/0x340 mm/slub.c:4468 rcu_do_batch kernel/rcu/tree.c:2565 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2839 __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:3102 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3206 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2344 [inline] do_vmi_align_munmap+0x155c/0x18c0 mm/mmap.c:2687 do_vmi_munmap+0x265/0x2f0 mm/mmap.c:2759 mmap_region+0x729/0x2060 mm/mmap.c:2810 do_mmap+0x8ad/0xfa0 mm/mmap.c:1397 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573 ksys_mmap_pgoff+0x544/0x720 mm/mmap.c:1443 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 ffff88805f2e99b0 which belongs to the cache vm_area_struct of size 184 The buggy address is located 32 bytes inside of freed 184-byte region [ffff88805f2e99b0, ffff88805f2e9a68) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5f2e9 memcg:ffff88802991d101 flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff888015eebb40 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000001ffffefff ffff88802991d101 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 15679, tgid 495500522 (syz-executor.3), ts 15682, free_ts 361259445994 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1476 prep_new_page mm/page_alloc.c:1484 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4704 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2259 allocate_slab+0x5a/0x2e0 mm/slub.c:2422 new_slab mm/slub.c:2475 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3624 __slab_alloc+0x58/0xa0 mm/slub.c:3714 __slab_alloc_node mm/slub.c:3767 [inline] slab_alloc_node mm/slub.c:3945 [inline] kmem_cache_alloc_noprof+0x1c1/0x290 mm/slub.c:3964 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 mmap_region+0xc47/0x2060 mm/mmap.c:2873 do_mmap+0x8ad/0xfa0 mm/mmap.c:1397 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573 ksys_mmap_pgoff+0x544/0x720 mm/mmap.c:1443 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 15681 tgid 15681 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1096 [inline] free_unref_folios+0xf23/0x19e0 mm/page_alloc.c:2658 folios_put_refs+0x93a/0xa60 mm/swap.c:1022 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+0x44f/0xc80 mm/mmap.c:3354 __mmput+0x115/0x3c0 kernel/fork.c:1346 exit_mm+0x220/0x310 kernel/exit.c:568 do_exit+0x99e/0x27e0 kernel/exit.c:864 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 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 Memory state around the buggy address: ffff88805f2e9880: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 ffff88805f2e9900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff88805f2e9980: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb ^ ffff88805f2e9a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88805f2e9a80: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ==================================================================