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2002:a05:6808:16a5:b0:4d6:9133:cfe6 with SMTP id 5614622812f47-4f30bcdf81amr3861437b6e.43.1790897372471; Thu, 01 Oct 2026 16:29:32 -0700 (PDT) Date: Thu, 01 Oct 2026 16:29:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6abeecdc.7503fbd6.2d3f6.0010.GAE@google.com> Subject: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in md5_blocks 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: 6375e61c01e9 Add linux-next specific files for 20260928 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17231325580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1dae85014253be90 dashboard link: https://syzkaller.appspot.com/bug?extid=46bbbe175b7eea8036b8 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138ff605580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d21ac9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dac817cfa9ca/disk-6375e61c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e503a06f8d7e/vmlinux-6375e61c.xz kernel image: https://storage.googleapis.com/syzbot-assets/6a6051b849cb/bzImage-6375e61c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+46bbbe175b7eea8036b8@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in md5_block lib/crypto/md5.c:40 [inline] BUG: KASAN: slab-out-of-bounds in md5_blocks+0x120/0xbd0 lib/crypto/md5.c:126 Read of size 64 at addr ffff88803236dce0 by task syz.1.18/5953 CPU: 0 UID: 0 PID: 5953 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trac 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 md5_block lib/crypto/md5.c:40 [inline] md5_blocks+0x120/0xbd0 lib/crypto/md5.c:126 md5_update+0xef/0x150 lib/crypto/md5.c:161 md5+0xed/0x180 lib/crypto/md5.c:202 ecryptfs_write_tag_70_packet+0x820/0x12e0 fs/ecryptfs/keystore.c:741 ecryptfs_encrypt_filename fs/ecryptfs/crypto.c:1378 [inline] ecryptfs_encrypt_and_encode_filename+0x576/0x1580 fs/ecryptfs/crypto.c:1789 ecryptfs_lookup+0x20e/0x780 fs/ecryptfs/inode.c:402 lookup_one_qstr_excl+0x12d/0x360 fs/namei.c:1810 __start_dirop fs/namei.c:2920 [inline] start_dirop fs/namei.c:2942 [inline] filename_create+0x20e/0x370 fs/namei.c:5103 filename_mkdirat+0xd2/0x510 fs/namei.c:5449 __do_sys_mkdirat fs/namei.c:5477 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5474 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: 0033:0x7fe5ba99e159 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:00007ffeb47b2408 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fe5bac25fa0 RCX: 00007fe5ba99e159 RDX: 0000000000000080 RSI: 0000200000000100 RDI: 0000000000000003 RBP: 00007fe5baa3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe5bac25fac R14: 00007fe5bac25fa0 R15: 00007fe5bac25fa0 Allocated by task 5953: 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_flags_noprof+0x52d/0x790 mm/slub.c:5719 _kmalloc_flags_noprof mm/slab.h:55 [inline] __alloc_empty_sheaf+0x28/0x40 mm/slub.c:2854 alloc_empty_sheaf mm/slub.c:2874 [inline] __pcs_replace_empty_main+0x43b/0x6c0 mm/slub.c:4806 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] kmem_cache_alloc_noprof+0x394/0x600 mm/slub.c:5047 ecryptfs_init_fs_context+0x70/0x1b0 fs/ecryptfs/main.c:617 alloc_fs_context+0x99e/0xd00 fs/fs_context.c:295 do_new_mount+0x17f/0xdc0 fs/namespace.c:3841 do_mount fs/namespace.c:4194 [inline] __do_sys_mount fs/namespace.c:4407 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4384 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 ffff88803236dc00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 224 bytes inside of allocated 256-byte region [ffff88803236dc00, ffff88803236dd00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3236c 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 ffff88813ff22b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813ff22b40 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 29, tgid 29 (kdevtmpfs), ts 16571924726 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:5441 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] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_noprof+0x476/0x710 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] _kmalloc_array_noprof include/linux/slab.h:1211 [inline] security_inode_init_security+0x102/0x3e0 security/security.c:1386 shmem_mknod+0x1ea/0x340 mm/shmem.c:4042 vfs_mknod+0x448/0x610 fs/namei.c:5282 handle_create drivers/base/devtmpfs.c:283 [inline] handle drivers/base/devtmpfs.c:435 [inline] devtmpfs_work_loop+0x861/0xdf0 drivers/base/devtmpfs.c:450 devtmpfsd+0x4d/0x50 drivers/base/devtmpfs.c:492 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page_owner free stack trace missing Memory state around the buggy address: ffff88803236dc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803236dc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88803236dd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88803236dd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803236de00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- This report is generated by a bot. 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