================================================================== BUG: KASAN: slab-out-of-bounds in ecryptfs_verify_auth_tok_from_key+0x350/0x3a0 fs/ecryptfs/keystore.c:465 Read of size 2 at addr ffff888014320559 by task syz.0.0/5333 CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 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_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 ecryptfs_verify_auth_tok_from_key+0x350/0x3a0 fs/ecryptfs/keystore.c:465 ecryptfs_keyring_auth_tok_for_sig+0xec/0x250 fs/ecryptfs/keystore.c:1606 ecryptfs_init_global_auth_toks fs/ecryptfs/main.c:194 [inline] ecryptfs_validate_options fs/ecryptfs/main.c:420 [inline] ecryptfs_get_tree+0x547/0x12a0 fs/ecryptfs/main.c:453 vfs_get_tree+0x92/0x2a0 fs/super.c:1943 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0e0d39f559 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:00007f0e0e279fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f0e0d625fa0 RCX: 00007f0e0d39f559 RDX: 00002000000001c0 RSI: 0000200000000180 RDI: 0000200000000140 RBP: 00007f0e0d436b20 R08: 0000200000000200 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0e0d626038 R14: 00007f0e0d625fa0 R15: 00007ffd7295e5c8 Allocated by task 5333: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5531 [inline] __kmalloc_noprof+0x366/0x710 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] user_preparse+0x9e/0x160 security/keys/user_defined.c:67 __key_create_or_update+0x360/0xa90 security/keys/key.c:861 key_create_or_update+0x42/0x60 security/keys/key.c:1028 __do_sys_add_key security/keys/keyctl.c:134 [inline] __se_sys_add_key+0x349/0x420 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888014320540 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of allocated 25-byte region [ffff888014320540, ffff888014320559) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14320 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c441780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4681, tgid 4681 (mount), ts 27711633594 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x1fc/0x400 mm/page_alloc.c:5429 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __kmalloc_cache_noprof+0x396/0x600 mm/slub.c:5676 _kmalloc_noprof include/linux/slab.h:991 [inline] slab_free_hook mm/slub.c:2732 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x156/0x650 mm/slub.c:6757 remove_vma mm/vma.c:517 [inline] vms_complete_munmap_vmas+0x892/0xbe0 mm/vma.c:1441 __mmap_complete+0xab/0x4b0 mm/vma.c:2760 __mmap_region mm/vma.c:2938 [inline] mmap_region+0x16c0/0x23c0 mm/vma.c:3014 do_mmap+0xe0a/0x1300 mm/mmap.c:573 vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581 ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1 tgid 1 ts 27452065557 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2952 free_reserved_page include/linux/mm.h:4072 [inline] __free_reserved_area mm/memblock.c:926 [inline] free_reserved_area+0x204/0x2e0 mm/memblock.c:957 free_init_pages arch/x86/mm/init.c:936 [inline] free_kernel_image_pages+0xa2/0x100 arch/x86/mm/init.c:952 kernel_init+0x36/0x1d0 init/main.c:1635 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888014320400: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc ffff888014320480: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc >ffff888014320500: 00 00 00 00 fc fc fc fc 00 00 00 01 fc fc fc fc ^ ffff888014320580: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ffff888014320600: 00 00 00 00 fc fc fc fc 00 00 00 fc fc fc fc fc 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