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AKwUvBxnD73xLEbrHugi5o/L+b8ah+DP9gCPcmXsu0/u455QSYyghigjN7arF17Ve80WhgQvX4f/ybEvfywTdSSlwfousKZJSCs=@vger.kernel.org X-Gm-Message-State: AFuF++lOj2c+G3ZeYNCt1IN+X036qUsec3I4X7v7YgTBHyFt9ruNf9v2 1DrtW63XygN+fyWALlPIOWmyvZ6cH3rvTfrIB+oz45udr9t8hf8sj1+uYfVs1tUlOjIxUpp/5Wo eZBsVgf0s2AAkUDdXncWWdUj3WOzwVsJzu769/CQPTYEQMdgE2mmGsxX44lk= Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:15a6:b0:4c5:b120:9833 with SMTP id 5614622812f47-50c45c69989mr2316907b6e.6.1791565464345; Fri, 09 Oct 2026 10:04:24 -0700 (PDT) Date: Fri, 09 Oct 2026 10:04:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac91e98.bbc4c7f9.15faa7.0023.GAE@google.com> Subject: [syzbot] [lsm?] WARNING in landlock_merge_ruleset From: syzbot To: gnoack@google.com, jmorris@namei.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, mic@digikod.net, paul@paul-moore.com, serge@hallyn.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: aac26bee2287 Add linux-next specific files for 20261008 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1772f715580000 kernel config: https://syzkaller.appspot.com/x/.config?x=814b0d31d59c294 dashboard link: https://syzkaller.appspot.com/bug?extid=a0eecb22de4d821a9e5d 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=1305c8e1580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15497c3e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/92e867ba9905/disk-aac26bee.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c4cc176072c1/vmlinux-aac26bee.xz kernel image: https://storage.googleapis.com/syzbot-assets/c603638afe28/bzImage-aac26bee.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a0eecb22de4d821a9e5d@syzkaller.appspotmail.com ------------[ cut here ]------------ memcpy: detected buffer overflow: 16 byte read of buffer size 0 WARNING: lib/string_helpers.c:1037 at __fortify_report+0x6b/0xa0 lib/string_helpers.c:1036, CPU#0: syz-executor347/5624 Modules linked in: CPU: 0 UID: 0 PID: 5624 Comm: syz-executor347 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:__fortify_report+0x89/0xa0 lib/string_helpers.c:1036 Code: e8 ec f1 4b fd 48 8d 3d c5 7e d7 0c 45 84 e4 49 8b 37 48 c7 c0 40 8d 8d 8c 48 c7 c1 60 8d 8d 8c 48 0f 44 c8 4c 89 f2 49 89 d8 <67> 48 0f b9 3a 5b 41 5c 41 5e 41 5f 5d e9 45 84 14 07 cc cc cc cc RSP: 0018:ffffc90003bb7dc8 EFLAGS: 00010246 RAX: ffffffff8c8d8d40 RBX: 0000000000000000 RCX: ffffffff8c8d8d40 RDX: 0000000000000010 RSI: ffffffff8c8d8c20 RDI: ffffffff91c743f0 RBP: 000000000000000e R08: 0000000000000000 R09: 1ffff11006d9ed01 R10: dffffc0000000000 R11: ffffed1006d9ed02 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000010 R15: ffffffff8c8d8a78 FS: 000055558b41f400(0000) GS:ffff888123429000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055c55f793000 CR3: 00000000359c2000 CR4: 00000000003526f0 Call Trace: __fortify_panic+0x9/0x10 lib/string_helpers.c:1043 fortify_memcpy_chk include/linux/fortify-string.h:547 [inline] inherit_ruleset security/landlock/domain.c:407 [inline] landlock_merge_ruleset+0xc46/0xc90 security/landlock/domain.c:468 __do_sys_landlock_restrict_self security/landlock/syscalls.c:809 [inline] __se_sys_landlock_restrict_self+0x2bc/0xd40 security/landlock/syscalls.c:732 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: 0033:0x7fc0d85c8c39 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff6fcb7858 EFLAGS: 00000246 ORIG_RAX: 00000000000001be RAX: ffffffffffffffda RBX: 00007fff6fcb7988 RCX: 00007fc0d85c8c39 RDX: 00007fc0d85c8c39 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 00007fff6fcb7988 R09: 00007fff6fcb7988 R10: 00007fff6fcb7988 R11: 0000000000000246 R12: 00007fff6fcb7978 R13: 0000000000000002 R14: 00007fc0d8659ca0 R15: 0000000000000002 ---------------- Code disassembly (best guess): 0: e8 ec f1 4b fd call 0xfd4bf1f1 5: 48 8d 3d c5 7e d7 0c lea 0xcd77ec5(%rip),%rdi # 0xcd77ed1 c: 45 84 e4 test %r12b,%r12b f: 49 8b 37 mov (%r15),%rsi 12: 48 c7 c0 40 8d 8d 8c mov $0xffffffff8c8d8d40,%rax 19: 48 c7 c1 60 8d 8d 8c mov $0xffffffff8c8d8d60,%rcx 20: 48 0f 44 c8 cmove %rax,%rcx 24: 4c 89 f2 mov %r14,%rdx 27: 49 89 d8 mov %rbx,%r8 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 5b pop %rbx 30: 41 5c pop %r12 32: 41 5e pop %r14 34: 41 5f pop %r15 36: 5d pop %rbp 37: e9 45 84 14 07 jmp 0x7148481 3c: cc int3 3d: cc int3 3e: cc int3 3f: cc int3 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup