RSP: 002b:00007f4df89e2f38 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4df7c8c467 RDX: 0000000000020000 RSI: 0000000000020000 RDI: 00007f4dee3ff000 RBP: 00007f4dee3ff000 R08: 0000000000000000 R09: 0000000000000326 R10: 0000000000020000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4df89e2fdc R14: 00007f4df89e2fe0 R15: 0000000020000342 ================================================================== BUG: KASAN: slab-out-of-bounds in mt_slot lib/maple_tree.c:816 [inline] BUG: KASAN: slab-out-of-bounds in mas_slot lib/maple_tree.c:849 [inline] BUG: KASAN: slab-out-of-bounds in mt_validate_nulls lib/maple_tree.c:7172 [inline] BUG: KASAN: slab-out-of-bounds in mt_validate+0x51d9/0x5ca0 lib/maple_tree.c:7227 Read of size 8 at addr ffff88802ae6ff00 by task syz-executor.0/15606 CPU: 1 PID: 15606 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-10173-ga901a3568fd2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 mt_slot lib/maple_tree.c:816 [inline] mas_slot lib/maple_tree.c:849 [inline] mt_validate_nulls lib/maple_tree.c:7172 [inline] mt_validate+0x51d9/0x5ca0 lib/maple_tree.c:7227 validate_mm+0xe7/0x500 mm/mmap.c:300 do_vmi_align_munmap+0x13b1/0x15c0 mm/mmap.c:2561 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2619 __vm_munmap+0x230/0x450 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x69/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4df7c8c467 Code: 00 00 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb 85 66 2e 0f 1f 84 00 00 00 00 00 90 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4df89e2f38 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4df7c8c467 RDX: 0000000000020000 RSI: 0000000000020000 RDI: 00007f4dee3ff000 RBP: 00007f4dee3ff000 R08: 0000000000000000 R09: 0000000000000326 R10: 0000000000020000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4df89e2fdc R14: 00007f4df89e2fe0 R15: 0000000020000342 Allocated by task 15606: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:750 slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x123/0x300 mm/slub.c:3494 mt_alloc_one lib/maple_tree.c:159 [inline] mas_alloc_nodes+0x276/0x800 lib/maple_tree.c:1282 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_node_count lib/maple_tree.c:1376 [inline] mas_wr_node_store lib/maple_tree.c:4100 [inline] mas_wr_modify+0x1346/0x2290 lib/maple_tree.c:4346 mas_store_gfp+0x30d/0x410 lib/maple_tree.c:5506 vma_iter_clear_gfp mm/mmap.c:162 [inline] do_vmi_align_munmap+0xfad/0x15c0 mm/mmap.c:2538 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2619 __vm_munmap+0x230/0x450 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x69/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:491 __call_rcu_common kernel/rcu/tree.c:2649 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2763 ma_free_rcu lib/maple_tree.c:189 [inline] mas_free lib/maple_tree.c:1344 [inline] mas_mat_free lib/maple_tree.c:1021 [inline] mas_wmb_replace+0xd8f/0x1380 lib/maple_tree.c:2801 mas_split lib/maple_tree.c:3587 [inline] mas_commit_b_node+0x157e/0x2460 lib/maple_tree.c:3638 mas_wr_bnode lib/maple_tree.c:4315 [inline] mas_wr_modify+0x6ec/0x2290 lib/maple_tree.c:4353 mas_store_prealloc+0x313/0x650 lib/maple_tree.c:5529 vma_complete+0x1ec/0xb40 mm/mmap.c:553 __split_vma+0x7c2/0x7f0 mm/mmap.c:2381 mprotect_fixup+0x5c5/0xa50 mm/mprotect.c:649 do_mprotect_pkey+0x8b3/0xd90 mm/mprotect.c:817 __do_sys_mprotect mm/mprotect.c:838 [inline] __se_sys_mprotect mm/mprotect.c:835 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:835 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:491 __call_rcu_common kernel/rcu/tree.c:2649 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2763 ma_free_rcu lib/maple_tree.c:189 [inline] mas_free lib/maple_tree.c:1344 [inline] mas_mat_free lib/maple_tree.c:1021 [inline] mas_wmb_replace+0xd8f/0x1380 lib/maple_tree.c:2801 mas_split lib/maple_tree.c:3587 [inline] mas_commit_b_node+0x157e/0x2460 lib/maple_tree.c:3638 mas_wr_bnode lib/maple_tree.c:4315 [inline] mas_wr_modify+0x6ec/0x2290 lib/maple_tree.c:4353 mas_store_prealloc+0x313/0x650 lib/maple_tree.c:5529 vma_complete+0x1ec/0xb40 mm/mmap.c:553 __split_vma+0x7c2/0x7f0 mm/mmap.c:2381 do_vmi_align_munmap+0x501/0x15c0 mm/mmap.c:2477 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2619 __vm_munmap+0x230/0x450 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x69/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88802ae6fe00 which belongs to the cache maple_node of size 256 The buggy address is located 0 bytes to the right of allocated 256-byte region [ffff88802ae6fe00, ffff88802ae6ff00) The buggy address belongs to the physical page: page:ffffea0000ab9b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae6e head:ffffea0000ab9b80 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff88801324d000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5019, tgid 5019 (syz-executor.0), ts 242223110872, free_ts 233297835358 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x84/0x2f0 mm/slub.c:2062 ___slab_alloc+0xade/0x1100 mm/slub.c:3215 __kmem_cache_alloc_bulk mm/slub.c:3966 [inline] kmem_cache_alloc_bulk+0x196/0x4b0 mm/slub.c:4041 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1304 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_node_count lib/maple_tree.c:1376 [inline] mas_expected_entries+0x21b/0x350 lib/maple_tree.c:5656 vma_iter_bulk_alloc include/linux/mm.h:898 [inline] dup_mmap kernel/fork.c:681 [inline] dup_mm kernel/fork.c:1688 [inline] copy_mm+0x7bf/0x1d30 kernel/fork.c:1737 copy_process+0x1a0f/0x4290 kernel/fork.c:2503 kernel_clone+0x222/0x800 kernel/fork.c:2911 __do_sys_clone kernel/fork.c:3054 [inline] __se_sys_clone kernel/fork.c:3038 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3038 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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:1161 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2443 __slab_free+0x2f6/0x390 mm/slub.c:3707 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:750 slab_alloc_node mm/slub.c:3470 [inline] kmem_cache_alloc_node+0x149/0x330 mm/slub.c:3515 __alloc_skb+0x181/0x420 net/core/skbuff.c:634 alloc_skb_fclone include/linux/skbuff.h:1339 [inline] tcp_stream_alloc_skb+0x3d/0x310 net/ipv4/tcp.c:867 tcp_sendmsg_locked+0x1b13/0x5010 net/ipv4/tcp.c:1147 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1333 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg net/socket.c:748 [inline] sock_write_iter+0x39a/0x520 net/socket.c:1129 call_write_iter include/linux/fs.h:1871 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x782/0xaf0 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88802ae6fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802ae6fe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802ae6ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802ae6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802ae70000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================