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linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:8509:b0:65c:fdfd:9794 with SMTP id 006d021491bc7-65d0e972131mr9480608eaf.29.1767260806411; Thu, 01 Jan 2026 01:46:46 -0800 (PST) Date: Thu, 01 Jan 2026 01:46:46 -0800 In-Reply-To: <20251231213314.2979118-1-utilityemal77@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69564286.050a0220.a1b6.0337.GAE@google.com> Subject: [syzbot ci] Re: lsm: Add hook unix_path_connect From: syzbot ci To: gnoack3000@gmail.com, gnoack@google.com, horms@kernel.org, jmorris@namei.org, kuniyu@google.com, linux-security-module@vger.kernel.org, m@maowtm.org, mic@digikod.net, netdev@vger.kernel.org, paul@paul-moore.com, serge@hallyn.com, utilityemal77@gmail.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] lsm: Add hook unix_path_connect https://lore.kernel.org/all/20251231213314.2979118-1-utilityemal77@gmail.com * [RFC PATCH 1/1] lsm: Add hook unix_path_connect and found the following issues: * KASAN: null-ptr-deref Read in unix_dgram_connect * general protection fault in apparmor_socket_sock_rcv_skb * general protection fault in unix_stream_connect Full report is available here: https://ci.syzbot.org/series/c288b2d0-af95-47d8-b359-79ff653da27b *** KASAN: null-ptr-deref Read in unix_dgram_connect tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: dbf8fe85a16a33d6b6bd01f2bc606fc017771465 arch: amd64 compiler: Debian clang version 21.1.8 (++20251202083448+f68f64eb8130-1~exp1~20251202083504.46), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/9f532f02-856f-4157-a897-26c37e30c537/config C repro: https://ci.syzbot.org/findings/d6706e7e-97bc-45af-910c-fb20c328ac02/c_repro syz repro: https://ci.syzbot.org/findings/d6706e7e-97bc-45af-910c-fb20c328ac02/syz_repro ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: null-ptr-deref in sock_flag include/net/sock.h:1048 [inline] BUG: KASAN: null-ptr-deref in unix_dgram_connect+0x356/0xc20 net/unix/af_unix.c:1550 Read of size 8 at addr 0000000000000060 by task syz.0.17/5977 CPU: 0 UID: 0 PID: 5977 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 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 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] sock_flag include/net/sock.h:1048 [inline] unix_dgram_connect+0x356/0xc20 net/unix/af_unix.c:1550 __sys_connect_file net/socket.c:2089 [inline] __sys_connect+0x312/0x450 net/socket.c:2108 __do_sys_connect net/socket.c:2114 [inline] __se_sys_connect net/socket.c:2111 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2111 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f78e4f9acb9 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:00007ffc8b576858 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f78e5205fa0 RCX: 00007f78e4f9acb9 RDX: 000000000000006e RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f78e5008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f78e5205fac R14: 00007f78e5205fa0 R15: 00007f78e5205fa0 ================================================================== *** general protection fault in apparmor_socket_sock_rcv_skb tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: dbf8fe85a16a33d6b6bd01f2bc606fc017771465 arch: amd64 compiler: Debian clang version 21.1.8 (++20251202083448+f68f64eb8130-1~exp1~20251202083504.46), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/9f532f02-856f-4157-a897-26c37e30c537/config C repro: https://ci.syzbot.org/findings/7e600b6d-75f6-48a2-a2a0-c69a3aadaa9b/c_repro syz repro: https://ci.syzbot.org/findings/7e600b6d-75f6-48a2-a2a0-c69a3aadaa9b/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000096: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000004b0-0x00000000000004b7] CPU: 0 UID: 0 PID: 5987 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:aa_sock security/apparmor/include/net.h:57 [inline] RIP: 0010:apparmor_socket_sock_rcv_skb+0x3a/0x350 security/apparmor/lsm.c:1513 Code: ec 10 49 89 f7 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 99 57 6f fd 48 89 5c 24 08 48 81 c3 b0 04 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 17 54 d6 fd 44 8b 25 20 70 74 09 RSP: 0018:ffffc90004237530 EFLAGS: 00010206 RAX: 0000000000000096 RBX: 00000000000004b0 RCX: ffff88816872d7c0 RDX: 0000000000000000 RSI: ffff888110f4e600 RDI: 0000000000000000 RBP: ffffc900042376d0 R08: ffffffff82447acc R09: ffffffff8e341b20 R10: dffffc0000000000 R11: ffffed102388124c R12: ffff888110f4e67e R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888110f4e600 FS: 00007f36295926c0(0000) GS:ffff88818e40e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3629591ff8 CR3: 0000000113938000 CR4: 00000000000006f0 Call Trace: security_sock_rcv_skb+0x8f/0x270 security/security.c:4333 sk_filter_trim_cap+0x19b/0xd90 net/core/filter.c:156 sk_filter include/linux/filter.h:1102 [inline] unix_dgram_sendmsg+0x7bc/0x17b0 net/unix/af_unix.c:2173 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x500/0x810 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmmsg+0x27c/0x4e0 net/socket.c:2735 __do_sys_sendmmsg net/socket.c:2762 [inline] __se_sys_sendmmsg net/socket.c:2759 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f362879acb9 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:00007f3629592028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f3628a06090 RCX: 00007f362879acb9 RDX: 0000000000000002 RSI: 0000200000000ec0 RDI: 0000000000000006 RBP: 00007f3628808bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3628a06128 R14: 00007f3628a06090 R15: 00007ffcf5635f88 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:aa_sock security/apparmor/include/net.h:57 [inline] RIP: 0010:apparmor_socket_sock_rcv_skb+0x3a/0x350 security/apparmor/lsm.c:1513 Code: ec 10 49 89 f7 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 99 57 6f fd 48 89 5c 24 08 48 81 c3 b0 04 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 17 54 d6 fd 44 8b 25 20 70 74 09 RSP: 0018:ffffc90004237530 EFLAGS: 00010206 RAX: 0000000000000096 RBX: 00000000000004b0 RCX: ffff88816872d7c0 RDX: 0000000000000000 RSI: ffff888110f4e600 RDI: 0000000000000000 RBP: ffffc900042376d0 R08: ffffffff82447acc R09: ffffffff8e341b20 R10: dffffc0000000000 R11: ffffed102388124c R12: ffff888110f4e67e R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888110f4e600 FS: 00007f36295926c0(0000) GS:ffff88818e40e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3629591ff8 CR3: 0000000113938000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 49 89 f7 mov %rsi,%r15 3: 48 89 fb mov %rdi,%rbx 6: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 d: fc ff df 10: e8 99 57 6f fd call 0xfd6f57ae 15: 48 89 5c 24 08 mov %rbx,0x8(%rsp) 1a: 48 81 c3 b0 04 00 00 add $0x4b0,%rbx 21: 48 89 d8 mov %rbx,%rax 24: 48 c1 e8 03 shr $0x3,%rax * 28: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2d: 74 08 je 0x37 2f: 48 89 df mov %rbx,%rdi 32: e8 17 54 d6 fd call 0xfdd6544e 37: 44 8b 25 20 70 74 09 mov 0x9747020(%rip),%r12d # 0x974705e *** general protection fault in unix_stream_connect tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: dbf8fe85a16a33d6b6bd01f2bc606fc017771465 arch: amd64 compiler: Debian clang version 21.1.8 (++20251202083448+f68f64eb8130-1~exp1~20251202083504.46), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/9f532f02-856f-4157-a897-26c37e30c537/config C repro: https://ci.syzbot.org/findings/b05720e7-cc44-4796-b729-e2f0c0b9e015/c_repro syz repro: https://ci.syzbot.org/findings/b05720e7-cc44-4796-b729-e2f0c0b9e015/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc00000000dc: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000006e0-0x00000000000006e7] CPU: 1 UID: 0 PID: 6000 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 68 4e 09 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90003f47c00 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff8b7776ee RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8b7776ee RDI: 00000000000000dc RBP: ffffffff8a18a569 R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1037900903 R12: 0000000000000000 R13: 00000000000006e0 R14: 00000000000006e0 R15: 0000000000000001 FS: 00007fe5e870a6c0(0000) GS:ffff8882a9a0e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe5e77e8400 CR3: 0000000114c7e000 CR4: 00000000000006f0 Call Trace: __kasan_check_byte+0x12/0x40 mm/kasan/common.c:573 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x84/0x330 kernel/locking/lockdep.c:5842 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] unix_stream_connect+0x469/0x1010 net/unix/af_unix.c:1692 __sys_connect_file net/socket.c:2089 [inline] __sys_connect+0x312/0x450 net/socket.c:2108 __do_sys_connect net/socket.c:2114 [inline] __se_sys_connect net/socket.c:2111 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2111 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe5e779acb9 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:00007fe5e870a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fe5e7a05fa0 RCX: 00007fe5e779acb9 RDX: 000000000000006e RSI: 0000200000000000 RDI: 0000000000000005 RBP: 00007fe5e7808bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe5e7a06038 R14: 00007fe5e7a05fa0 R15: 00007ffcf198af58 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 68 4e 09 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90003f47c00 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff8b7776ee RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8b7776ee RDI: 00000000000000dc RBP: ffffffff8a18a569 R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1037900903 R12: 0000000000000000 R13: 00000000000006e0 R14: 00000000000006e0 R15: 0000000000000001 FS: 00007fe5e870a6c0(0000) GS:ffff8882a9a0e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe5e77e8400 CR3: 0000000114c7e000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: 0f 1f 40 00 nopl 0x0(%rax) 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 0f 1f 40 d6 nopl -0x2a(%rax) 18: 48 c1 ef 03 shr $0x3,%rdi 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df * 26: 0f b6 04 07 movzbl (%rdi,%rax,1),%eax <-- trapping instruction 2a: 3c 08 cmp $0x8,%al 2c: 0f 92 c0 setb %al 2f: e9 40 68 4e 09 jmp 0x94e6874 34: cc int3 35: 66 data16 36: 66 data16 37: 66 data16 38: 66 data16 39: 66 data16 3a: 66 data16 3b: 2e cs *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.