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with SMTP id 5614622812f47-50c52a4eb8cmr6429470b6e.39.1791694778402; Sat, 10 Oct 2026 21:59:38 -0700 (PDT) Date: Sat, 10 Oct 2026 21:59:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6acb17ba.a150a118.27e199.0035.GAE@google.com> Subject: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_from_hex From: syzbot To: code@tyhicks.com, ecryptfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a5ebb76233b7 Merge tag 'edac_urgent_for_v7.3_rc7' of git:/.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=15b396d1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=129d675874dbf896 dashboard link: https://syzkaller.appspot.com/bug?extid=dc50906b100ac7a1c34d compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117119a9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dc50906b100ac7a1c34d@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in ecryptfs_from_hex+0x18c/0x1d0 fs/ecryptfs/crypto.c:45 Read of size 1 at addr ffff888048a432e0 by task syz-executor328/6037 CPU: 3 UID: 0 PID: 6037 Comm: syz-executor328 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_from_hex+0x18c/0x1d0 fs/ecryptfs/crypto.c:45 write_tag_3_packet+0x145/0x1430 fs/ecryptfs/keystore.c:2182 ecryptfs_generate_key_packet_set+0x7ae/0x1880 fs/ecryptfs/keystore.c:2422 ecryptfs_write_headers_virt fs/ecryptfs/crypto.c:955 [inline] ecryptfs_write_metadata+0x590/0x930 fs/ecryptfs/crypto.c:1065 ecryptfs_initialize_file+0xb6/0x180 fs/ecryptfs/inode.c:252 ecryptfs_create+0x393/0x550 fs/ecryptfs/inode.c:286 lookup_open+0x1255/0x1990 fs/namei.c:4596 open_last_lookups fs/namei.c:4796 [inline] path_openat+0xa2c/0x2440 fs/namei.c:5026 do_file_open+0x20e/0x430 fs/namei.c:5058 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1434 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: 0033:0x7fde6f0cb677 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffc67310690 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000555560ff1400 RCX: 00007fde6f0cb677 RDX: 0000000000000042 RSI: 00007fde6f1040d5 RDI: ffffffffffffff9c RBP: 00007fde6f104095 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001b6 R11: 0000000000000202 R12: 00007ffc67310858 R13: 0000000000000002 R14: 00007fde6f12ecc0 R15: 0000000000000002 Allocated by task 6037: 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:5414 [inline] __kmalloc_noprof+0x32f/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] user_preparse+0x9b/0x1c0 security/keys/user_defined.c:67 __key_create_or_update+0x413/0xe30 security/keys/key.c:854 key_create_or_update+0x42/0x60 security/keys/key.c:1021 __do_sys_add_key+0x2e8/0x460 security/keys/keyctl.c:134 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 ffff888048a43000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of allocated 736-byte region [ffff888048a43000, ffff888048a432e0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888048a45000 pfn:0x48a40 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801d042dc0 ffff88801d040888 ffffea00015b1010 raw: ffff888048a45000 0000000000100008 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801d042dc0 ffff88801d040888 ffffea00015b1010 head: ffff888048a45000 0000000000100008 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5773, tgid 5773 (syz-executor), ts 50740633132 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0x67c/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] batadv_hash_new+0x74/0x2e0 net/batman-adv/hash.c:55 batadv_bla_init+0x361/0x700 net/batman-adv/bridge_loop_avoidance.c:1619 batadv_mesh_init+0x550/0x8d0 net/batman-adv/main.c:251 batadv_meshif_init_late+0xb26/0xe60 net/batman-adv/mesh-interface.c:867 register_netdevice+0x685/0x25a0 net/core/dev.c:11468 batadv_meshif_newlink+0x8f/0xc0 net/batman-adv/mesh-interface.c:1145 rtnl_newlink_create net/core/rtnetlink.c:3974 [inline] __rtnl_newlink net/core/rtnetlink.c:4103 [inline] rtnl_newlink+0x1697/0x2620 net/core/rtnetlink.c:4220 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7137 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2575 page last free pid 5752 tgid 5752 ts 50049458993 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] free_pages_prepare+0x586/0xe00 mm/page_alloc.c:1463 __free_contig_range_common+0x14f/0x250 mm/page_alloc.c:7072 __free_contig_range mm/page_alloc.c:7117 [inline] free_pages_bulk+0x12a/0x200 mm/page_alloc.c:5322 vm_area_free_pages+0xb2/0x2a0 mm/vmalloc.c:3461 vfree mm/vmalloc.c:3510 [inline] vfree+0xf7/0x6d0 mm/vmalloc.c:3484 kcov_put kernel/kcov.c:449 [inline] kcov_put kernel/kcov.c:445 [inline] kcov_close+0x34/0x60 kernel/kcov.c:556 __fput+0x400/0xb60 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x8da/0x2a50 kernel/exit.c:986 do_group_exit+0xd5/0x2a0 kernel/exit.c:1129 get_signal+0x1ec7/0x21e0 kernel/signal.c:3112 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888048a43180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888048a43200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888048a43280: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff888048a43300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888048a43380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. 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