R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fb122026038 R14: 00007fb122025fa0 R15: 00007ffc8db43768 ================================================================== BUG: KASAN: slab-use-after-free in ecryptfs_destroy_mount_crypt_stat+0x28f/0x360 fs/ecryptfs/crypto.c:137 Read of size 4 at addr ffff88803f59f090 by task syz.5.782/8616 CPU: 0 UID: 0 PID: 8616 Comm: syz.5.782 Tainted: G L Y syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP, [Y]=FORCED_BIND 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_destroy_mount_crypt_stat+0x28f/0x360 fs/ecryptfs/crypto.c:137 ecryptfs_get_tree+0x1097/0x1580 fs/ecryptfs/main.c:566 vfs_get_tree+0x92/0x320 fs/super.c:1943 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount fs/namespace.c:3986 [inline] path_mount+0x7d0/0x2850 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount fs/namespace.c:4542 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb121d9f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb122c54028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb122025fa0 RCX: 00007fb121d9f559 RDX: 0000200000000480 RSI: 0000200000000000 RDI: 0000200000000400 RBP: 00007fb122c54090 R08: 0000200000000500 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fb122026038 R14: 00007fb122025fa0 R15: 00007ffc8db43768 Allocated by task 8616: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:351 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377 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_noprof+0x269/0x6a0 mm/slub.c:5047 ecryptfs_init_fs_context+0x6b/0x200 fs/ecryptfs/main.c:617 alloc_fs_context+0x607/0xf40 fs/fs_context.c:295 do_new_mount fs/namespace.c:3966 [inline] path_mount+0xf59/0x2850 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount fs/namespace.c:4542 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 8616: 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] kmem_cache_free+0x127/0x6c0 mm/slub.c:6757 ecryptfs_kill_block_super+0x81/0xa0 fs/ecryptfs/main.c:586 deactivate_locked_super+0xbd/0x130 fs/super.c:586 ecryptfs_get_tree+0x10ca/0x1580 fs/ecryptfs/main.c:563 vfs_get_tree+0x92/0x320 fs/super.c:1943 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount fs/namespace.c:3986 [inline] path_mount+0x7d0/0x2850 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount fs/namespace.c:4542 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803f59f080 which belongs to the cache ecryptfs_sb_cache of size 280 The buggy address is located 16 bytes inside of freed 280-byte region [ffff88803f59f080, ffff88803f59f198) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3f59e 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 ffff888103affcc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000200150015 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888103affcc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000200150015 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6045, tgid 6044 (syz.1.34), ts 41129427137 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1856 prep_new_page mm/page_alloc.c:1864 [inline] get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3935 __alloc_frozen_pages_noprof+0x2bd/0x3280 mm/page_alloc.c:5444 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab mm/slub.c:3499 [inline] new_slab+0xb1/0x6d0 mm/slub.c:3550 refill_objects+0xe3/0x410 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] kmem_cache_alloc_noprof+0x4bf/0x6a0 mm/slub.c:5047 ecryptfs_init_fs_context+0x6b/0x200 fs/ecryptfs/main.c:617 alloc_fs_context+0x607/0xf40 fs/fs_context.c:295 do_new_mount fs/namespace.c:3966 [inline] path_mount+0xf59/0x2850 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount fs/namespace.c:4542 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5781 tgid 5781 ts 41086014120 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:2954 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_noprof+0x269/0x6a0 mm/slub.c:5047 alloc_filename fs/namei.c:147 [inline] do_getname+0x35/0x390 fs/namei.c:187 getname_flags fs/namei.c:230 [inline] class_filename_flags_constructor include/linux/fs.h:2593 [inline] user_path_at+0x26/0x60 fs/namei.c:3640 ksys_umount fs/namespace.c:2123 [inline] __do_sys_umount fs/namespace.c:2131 [inline] __se_sys_umount fs/namespace.c:2129 [inline] __x64_sys_umount+0x10a/0x1a0 fs/namespace.c:2129 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803f59ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803f59f000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803f59f080: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803f59f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803f59f180: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================