================================================================== BUG: KASAN: slab-use-after-free in ecryptfs_write_tag_70_packet+0x117b/0x1410 fs/ecryptfs/keystore.c:742 Read of size 4 at addr ffff888029f5be98 by task syz.2.140/6556 CPU: 3 UID: 0 PID: 6556 Comm: syz.2.140 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 ecryptfs_write_tag_70_packet+0x117b/0x1410 fs/ecryptfs/keystore.c:742 ecryptfs_encrypt_filename fs/ecryptfs/crypto.c:1378 [inline] ecryptfs_encrypt_and_encode_filename+0x428/0xa60 fs/ecryptfs/crypto.c:1789 ecryptfs_lookup+0x1f7/0x830 fs/ecryptfs/inode.c:402 lookup_one_qstr_excl+0x1cd/0x250 fs/namei.c:1816 __start_renaming+0x16d/0x520 fs/namei.c:3888 filename_renameat2+0x53b/0xa90 fs/namei.c:6319 __do_sys_renameat2 fs/namei.c:6373 [inline] __se_sys_renameat2 fs/namei.c:6368 [inline] __ia32_sys_renameat2+0xee/0x140 fs/namei.c:6368 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf745efbc Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 58 b8 RSP: 002b:00000000f545550c EFLAGS: 00000292 ORIG_RAX: 0000000000000161 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000340 RDX: 0000000000000004 RSI: 0000000080000580 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6505: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5531 [inline] __kmalloc_flags_noprof+0x370/0x8e0 mm/slub.c:5719 _kmalloc_flags_noprof mm/slab.h:55 [inline] __alloc_empty_sheaf mm/slub.c:2854 [inline] alloc_empty_sheaf mm/slub.c:2874 [inline] init_percpu_sheaves mm/slub.c:7862 [inline] do_kmem_cache_create+0x70f/0x7b0 mm/slub.c:8913 create_cache mm/slab_common.c:252 [inline] __kmem_cache_create_args+0x1e3/0x440 mm/slab_common.c:387 __kmem_cache_create include/linux/slab.h:402 [inline] create_bio_slab block/bio.c:96 [inline] bio_find_or_create_slab block/bio.c:135 [inline] bioset_init+0x5ee/0x8a0 block/bio.c:2070 dm_table_alloc_md_mempools drivers/md/dm-table.c:1078 [inline] dm_table_complete+0xdd9/0x1c90 drivers/md/dm-table.c:1527 populate_table drivers/md/dm-ioctl.c:1614 [inline] table_load+0x44d/0x7b0 drivers/md/dm-ioctl.c:1645 ctl_ioctl+0x4d2/0xcc0 drivers/md/dm-ioctl.c:2221 dm_ctl_ioctl drivers/md/dm-ioctl.c:2243 [inline] dm_compat_ctl_ioctl+0x23/0x30 drivers/md/dm-ioctl.c:2249 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x2cf/0x360 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 6505: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kfree+0x22b/0x6d0 mm/slub.c:6923 __free_empty_sheaf mm/slub.c:2894 [inline] free_empty_sheaf mm/slub.c:2901 [inline] pcs_destroy+0x92/0x110 mm/slub.c:3163 __kmem_cache_release+0xd/0x20 mm/slub.c:7948 slab_kmem_cache_release+0xd/0x30 mm/slab_common.c:529 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 bio_put_slab block/bio.c:163 [inline] bioset_exit+0x3b1/0x520 block/bio.c:2029 dm_free_md_mempools drivers/md/dm.c:3424 [inline] dm_free_md_mempools+0x1f/0x40 drivers/md/dm.c:3419 dm_table_destroy+0x25d/0x510 drivers/md/dm-table.c:206 table_load+0x6d6/0x7b0 drivers/md/dm-ioctl.c:1714 ctl_ioctl+0x4d2/0xcc0 drivers/md/dm-ioctl.c:2221 dm_ctl_ioctl drivers/md/dm-ioctl.c:2243 [inline] dm_compat_ctl_ioctl+0x23/0x30 drivers/md/dm-ioctl.c:2249 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x2cf/0x360 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff888029f5be00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 152 bytes inside of freed 256-byte region [ffff888029f5be00, ffff888029f5bf00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29f5a head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801d442b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801d442b40 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5791, tgid 5791 (syz-executor), ts 61695326609 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x112f/0x3640 mm/page_alloc.c:3940 __alloc_pages_slowpath mm/page_alloc.c:4885 [inline] __alloc_frozen_pages_noprof+0x7a2/0x31e0 mm/page_alloc.c:5477 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab mm/slub.c:3499 [inline] new_slab+0xb1/0x6d0 mm/slub.c:3550 ___slab_alloc+0x5d1/0x810 mm/slub.c:4605 slab_alloc_node mm/slub.c:5024 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_flags_noprof+0x470/0x8e0 mm/slub.c:5719 _kmalloc_flags_noprof mm/slab.h:55 [inline] alloc_slab_obj_exts+0x6a/0x170 mm/slub.c:2218 __memcg_slab_post_alloc_hook+0x3f3/0x10b0 mm/memcontrol.c:3713 memcg_slab_post_alloc_hook mm/slub.c:2549 [inline] slab_post_alloc_hook mm/slub.c:4739 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x4f5/0x6a0 mm/slub.c:5047 vm_area_dup+0x27/0xb60 mm/vma_init.c:128 dup_mmap+0x526/0x2180 mm/mmap.c:1757 dup_mm kernel/fork.c:1549 [inline] copy_mm kernel/fork.c:1602 [inline] copy_process+0x7c5c/0x88e0 kernel/fork.c:2328 kernel_clone+0x176/0x9d0 kernel/fork.c:2798 __do_compat_sys_ia32_clone+0xd4/0x120 arch/x86/kernel/sys_ia32.c:255 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307 page last free pid 5777 tgid 5777 ts 60774980501 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2957 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5105 __alloc_skb+0x140/0x710 net/core/skbuff.c:705 alloc_skb_fclone include/linux/skbuff.h:1440 [inline] tcp_stream_alloc_skb+0x34/0x660 net/ipv4/tcp.c:934 tcp_sendmsg_locked+0x141d/0x46b0 net/ipv4/tcp.c:1267 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1462 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:864 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:818 [inline] sock_write_iter+0x4fd/0x5d0 net/socket.c:1269 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x1f8/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888029f5bd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029f5be00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029f5be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029f5bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029f5bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: d2 74 05 c1 shlb %cl,-0x3f(%rbp,%rax,1) 4: e8 0c 89 02 8b call 0x8b028915 9: 5d pop %rbp a: fc cld b: 31 c0 xor %eax,%eax d: c9 leave e: c3 ret f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 0f 1f 00 nopl (%rax) 21: 51 push %rcx 22: 52 push %rdx 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 36: 00 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 3e: 58 pop %rax 3f: b8 .byte 0xb8