================================================================== 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:295 [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+0xc7d/0xf30 mm/interval_tree.c:88 Read of size 8 at addr ffff88805a6ab3c8 by task syz-executor.5/16678 CPU: 1 PID: 16678 Comm: syz-executor.5 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 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:295 [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+0xc7d/0xf30 mm/interval_tree.c:88 unlink_anon_vmas+0x218/0x860 mm/rmap.c:408 free_pgtables+0x24d/0x420 mm/memory.c:430 exit_mmap+0x1ec/0x7a0 mm/mmap.c:3099 __mmput+0x128/0x4c0 kernel/fork.c:1188 mmput+0x5c/0x70 kernel/fork.c:1210 exit_mm kernel/exit.c:516 [inline] do_exit+0xa39/0x2a20 kernel/exit.c:807 do_group_exit+0xd0/0x2a0 kernel/exit.c:950 get_signal+0x21a6/0x2430 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:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdc15a8a5a9 Code: Unable to access opcode bytes at 0x7fdc15a8a57f. RSP: 002b:00007fdc16c15218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fdc15babf88 RCX: 00007fdc15a8a5a9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fdc15babf8c RBP: 00007fdc15babf80 R08: 00007fff1854b080 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fdc15babf8c R13: 00007fff184ec9cf R14: 00007fdc16c15300 R15: 0000000000022000 Allocated by task 16678: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7e/0x80 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:754 [inline] slab_alloc_node mm/slub.c:3336 [inline] slab_alloc mm/slub.c:3344 [inline] __kmem_cache_alloc_lru mm/slub.c:3351 [inline] kmem_cache_alloc+0x2b7/0x3d0 mm/slub.c:3360 vm_area_dup+0x81/0x380 kernel/fork.c:466 copy_vma+0x376/0x880 mm/mmap.c:3219 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 16678: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] kmem_cache_free+0xea/0x5b0 mm/slub.c:3621 copy_vma+0x6bc/0x880 mm/mmap.c:3246 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 ffff88805a6ab360 which belongs to the cache vm_area_struct of size 152 The buggy address is located 104 bytes inside of 152-byte region [ffff88805a6ab360, ffff88805a6ab3f8) The buggy address belongs to the physical page: page:ffffea000169aac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea000170dc80 pfn:0x5a6ab memcg:ffff88805af5b001 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff8880119d3b40 dead000000120012 0000000000000000 raw: ffffea000170dc80 dead000000000007 00000001ffffffff ffff88805af5b001 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 25018, tgid 25013 (syz-executor.0), ts 1473956659254, free_ts 1473904917054 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] slab_alloc mm/slub.c:3344 [inline] __kmem_cache_alloc_lru mm/slub.c:3351 [inline] kmem_cache_alloc+0x31c/0x3d0 mm/slub.c:3360 vm_area_dup+0x81/0x380 kernel/fork.c:466 dup_mmap+0x655/0x10b0 kernel/fork.c:643 dup_mm+0x91/0x370 kernel/fork.c:1529 copy_mm kernel/fork.c:1578 [inline] copy_process+0x3bc6/0x71b0 kernel/fork.c:2256 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone+0xba/0x100 kernel/fork.c:2817 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:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page_list+0x172/0xc40 mm/page_alloc.c:3528 release_pages+0xc8c/0x1360 mm/swap.c:1055 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/0x7a0 mm/mmap.c:3101 __mmput+0x128/0x4c0 kernel/fork.c:1188 mmput+0x5c/0x70 kernel/fork.c:1210 exit_mm kernel/exit.c:516 [inline] do_exit+0xa39/0x2a20 kernel/exit.c:807 __do_sys_exit kernel/exit.c:917 [inline] __se_sys_exit kernel/exit.c:915 [inline] __x64_sys_exit+0x3e/0x50 kernel/exit.c:915 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 Memory state around the buggy address: ffff88805a6ab280: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a6ab300: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb >ffff88805a6ab380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ^ ffff88805a6ab400: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb ffff88805a6ab480: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ==================================================================