================================================================== BUG: KASAN: use-after-free in vma_last_pgoff mm/interval_tree.c:20 [inline] BUG: KASAN: use-after-free in avc_last_pgoff mm/interval_tree.c:68 [inline] BUG: KASAN: use-after-free in __anon_vma_interval_tree_augment_compute_max mm/interval_tree.c:71 [inline] BUG: KASAN: use-after-free in __anon_vma_interval_tree_augment_propagate mm/interval_tree.c:71 [inline] BUG: KASAN: use-after-free in __rb_erase_augmented include/linux/rbtree_augmented.h:274 [inline] BUG: KASAN: use-after-free in rb_erase_augmented include/linux/rbtree_augmented.h:303 [inline] BUG: KASAN: use-after-free in rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline] BUG: KASAN: use-after-free in __anon_vma_interval_tree_remove mm/interval_tree.c:71 [inline] BUG: KASAN: use-after-free in anon_vma_interval_tree_remove+0xcb2/0xf30 mm/interval_tree.c:88 Read of size 8 at addr ffff8880773c69b0 by task syz-executor.4/15583 CPU: 0 PID: 15583 Comm: syz-executor.4 Not tainted 6.0.0-rc3-next-20220901-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 vma_last_pgoff mm/interval_tree.c:20 [inline] avc_last_pgoff mm/interval_tree.c:68 [inline] __anon_vma_interval_tree_augment_compute_max mm/interval_tree.c:71 [inline] __anon_vma_interval_tree_augment_propagate mm/interval_tree.c:71 [inline] __rb_erase_augmented include/linux/rbtree_augmented.h:274 [inline] rb_erase_augmented include/linux/rbtree_augmented.h:303 [inline] rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline] __anon_vma_interval_tree_remove mm/interval_tree.c:71 [inline] anon_vma_interval_tree_remove+0xcb2/0xf30 mm/interval_tree.c:88 unlink_anon_vmas+0x218/0x840 mm/rmap.c:406 free_pgtables+0x24d/0x420 mm/memory.c:429 exit_mmap+0x1ec/0x720 mm/mmap.c:3100 __mmput+0x128/0x4c0 kernel/fork.c:1187 mmput+0x5c/0x70 kernel/fork.c:1209 exit_mm kernel/exit.c:515 [inline] do_exit+0xb4c/0x2b60 kernel/exit.c:805 do_group_exit+0xd0/0x2a0 kernel/exit.c:948 get_signal+0x238c/0x2610 kernel/signal.c:2858 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f69418893c9 Code: Unable to access opcode bytes at RIP 0x7f694188939f. RSP: 002b:00007f6942998218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f694199bf88 RCX: 00007f69418893c9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f694199bf8c RBP: 00007f694199bf80 R08: 00007ffc250f8080 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f694199bf8c R13: 00007ffc250a5d0f R14: 00007f6942998300 R15: 0000000000022000 Allocated by task 15583: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3317 [inline] slab_alloc mm/slub.c:3325 [inline] __kmem_cache_alloc_lru mm/slub.c:3332 [inline] kmem_cache_alloc+0x2b7/0x3d0 mm/slub.c:3341 vm_area_dup+0x81/0x380 kernel/fork.c:466 copy_vma+0x376/0x880 mm/mmap.c:3220 move_vma+0x449/0xf60 mm/mremap.c:626 __do_sys_mremap+0x487/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 15583: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1651 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1677 slab_free mm/slub.c:3580 [inline] kmem_cache_free+0xe7/0x5b0 mm/slub.c:3602 copy_vma+0x6bc/0x880 mm/mmap.c:3247 move_vma+0x449/0xf60 mm/mremap.c:626 __do_sys_mremap+0x487/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880773c6948 which belongs to the cache vm_area_struct of size 152 The buggy address is located 104 bytes inside of 152-byte region [ffff8880773c6948, ffff8880773c69e0) The buggy address belongs to the physical page: page:ffffea0001dcf180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x773c6 memcg:ffff8880175a6201 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000085a180 dead000000000008 ffff888140006b40 raw: 0000000000000000 0000000000120012 00000001ffffffff ffff8880175a6201 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 15312, tgid 15308 (syz-executor.0), ts 859776516090, free_ts 858845375713 prep_new_page mm/page_alloc.c:2534 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4284 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5542 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1721 [inline] allocate_slab+0x228/0x370 mm/slub.c:1866 new_slab mm/slub.c:1919 [inline] ___slab_alloc+0xad0/0x1440 mm/slub.c:3100 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3198 slab_alloc_node mm/slub.c:3283 [inline] slab_alloc mm/slub.c:3325 [inline] __kmem_cache_alloc_lru mm/slub.c:3332 [inline] kmem_cache_alloc+0x31c/0x3d0 mm/slub.c:3341 vm_area_dup+0x81/0x380 kernel/fork.c:466 __split_vma+0x9f/0x5c0 mm/mmap.c:2210 do_mas_align_munmap+0x54c/0xee0 mm/mmap.c:2361 do_mas_munmap+0x26a/0x2b0 mm/mmap.c:2501 do_munmap+0xc3/0x100 mm/mmap.c:2515 move_vma+0x776/0xf60 mm/mremap.c:703 __do_sys_mremap+0x487/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1451 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1501 free_unref_page_prepare mm/page_alloc.c:3382 [inline] free_unref_page_list+0x16f/0xb90 mm/page_alloc.c:3524 release_pages+0xc6c/0x1590 mm/swap.c:1056 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:58 tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu mm/mmu_gather.c:262 [inline] tlb_finish_mmu+0x147/0x7e0 mm/mmu_gather.c:353 exit_mmap+0x1fe/0x720 mm/mmap.c:3102 __mmput+0x128/0x4c0 kernel/fork.c:1187 mmput+0x5c/0x70 kernel/fork.c:1209 exit_mm kernel/exit.c:515 [inline] do_exit+0xb4c/0x2b60 kernel/exit.c:805 do_group_exit+0xd0/0x2a0 kernel/exit.c:948 get_signal+0x238c/0x2610 kernel/signal.c:2858 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880773c6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880773c6900: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb >ffff8880773c6980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8880773c6a00: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ffff8880773c6a80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa ==================================================================