syz.6.551[2508] is installing a program with bpf_probe_write_user helper that may corrupt user memory! incfs_lookup_dentry err:-40 general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 2508 Comm: syz.6.551 Not tainted 5.10.227-syzkaller-00554-g550d1177dc67 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:d_backing_inode include/linux/dcache.h:558 [inline] RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1265 Code: 3f ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c7 9b 7c ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 aa 9b 7c ff 48 8b 1b 48 83 c3 0c RSP: 0018:ffffc9000152efb0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 0000000000080000 RDX: ffffc9000256f000 RSI: 00000000000005e3 RDI: 00000000000005e4 RBP: ffffc9000152efd8 R08: dffffc0000000000 R09: ffffc9000152f410 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000152f420 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9000152f410 FS: 00007f9e0a99a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffa CR3: 00000001271ee000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vfs_getattr+0x26/0x70 fs/stat.c:129 ovl_copy_up_one fs/overlayfs/copy_up.c:882 [inline] ovl_copy_up_flags+0x5af/0x2700 fs/overlayfs/copy_up.c:964 ovl_maybe_copy_up+0x15a/0x190 fs/overlayfs/copy_up.c:996 ovl_open+0xad/0x210 fs/overlayfs/file.c:151 do_dentry_open+0x7c1/0x10d0 fs/open.c:819 vfs_open fs/open.c:942 [inline] dentry_open+0xb8/0x100 fs/open.c:958 file_open+0x2a7/0x650 fs/incfs/vfs.c:1478 do_dentry_open+0x7c1/0x10d0 fs/open.c:819 vfs_open+0x73/0x80 fs/open.c:942 do_open fs/namei.c:3391 [inline] path_openat+0x2660/0x3000 fs/namei.c:3509 do_filp_open+0x21c/0x460 fs/namei.c:3536 do_sys_openat2+0x13f/0x710 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1244 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9e0c322ed9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9e0a99a058 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f9e0c4e8fa0 RCX: 00007f9e0c322ed9 RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000006 RBP: 00007f9e0c396cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9e0c4e8fa0 R15: 00007ffccbdaf298 Modules linked in: ---[ end trace db84684f83d41aec ]--- RIP: 0010:d_backing_inode include/linux/dcache.h:558 [inline] RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1265 Code: 3f ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c7 9b 7c ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 aa 9b 7c ff 48 8b 1b 48 83 c3 0c RSP: 0018:ffffc9000152efb0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 0000000000080000 RDX: ffffc9000256f000 RSI: 00000000000005e3 RDI: 00000000000005e4 RBP: ffffc9000152efd8 R08: dffffc0000000000 R09: ffffc9000152f410 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000152f420 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9000152f410 FS: 00007f9e0a99a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffa CR3: 00000001271ee000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff 49 8d decl -0x73(%rcx) 3: 5f pop %rdi 4: 08 48 89 or %cl,-0x77(%rax) 7: d8 48 c1 fmuls -0x3f(%rax) a: e8 03 42 80 3c call 0x3c804212 f: 28 00 sub %al,(%rax) 11: 74 08 je 0x1b 13: 48 89 df mov %rbx,%rdi 16: e8 c7 9b 7c ff call 0xff7c9be2 1b: 48 8b 1b mov (%rbx),%rbx 1e: 48 83 c3 30 add $0x30,%rbx 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 aa 9b 7c ff call 0xff7c9be2 38: 48 8b 1b mov (%rbx),%rbx 3b: 48 83 c3 0c add $0xc,%rbx