Hello, syzbot found the following issue on: HEAD commit: aeba456828b4 Add linux-next specific files for 20230718 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=111d6a62a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=e7ec534f91cfce6c dashboard link: https://syzkaller.appspot.com/bug?extid=98d3ceb7e01269e7bf4f compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15ecf646a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1476f30aa80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/94f67a948e1d/disk-aeba4568.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9818a252eddd/vmlinux-aeba4568.xz kernel image: https://storage.googleapis.com/syzbot-assets/fbf9befe9bc9/bzImage-aeba4568.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/d8265d21ad1c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+98d3ceb7e01269e7bf4f@xxxxxxxxxxxxxxxxxxxxxxxxx memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5032 'syz-executor324' loop0: detected capacity change from 0 to 1024 detected buffer overflow in strnlen ------------[ cut here ]------------ kernel BUG at lib/string_helpers.c:1031! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5032 Comm: syz-executor324 Not tainted 6.5.0-rc2-next-20230718-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:fortify_panic+0x1c/0x20 lib/string_helpers.c:1031 Code: ba fd eb d7 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 23 de 65 fd 48 89 de 48 c7 c7 00 2c c8 8a e8 e4 28 49 fd <0f> 0b 66 90 f3 0f 1e fa 41 55 41 54 55 53 48 89 fb e8 fe dd 65 fd RSP: 0018:ffffc90003a1f7b8 EFLAGS: 00010282 RAX: 0000000000000023 RBX: ffffffff8a873580 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816aad20 RDI: 0000000000000005 RBP: ffff888019f16cb8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: 1ffff92000743efa R13: 0000000000000004 R14: ffff888078fa69c0 R15: ffffc90003a1f7f0 FS: 0000555556e72380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000456b30 CR3: 0000000079883000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> strnlen include/linux/fortify-string.h:181 [inline] strscpy include/linux/fortify-string.h:324 [inline] hfsplus_show_options+0x658/0x740 fs/hfsplus/options.c:226 show_mountinfo+0x671/0x990 fs/proc_namespace.c:191 seq_read_iter+0xaf0/0x1280 fs/seq_file.c:272 call_read_iter include/linux/fs.h:1911 [inline] copy_splice_read+0x418/0x8f0 fs/splice.c:366 vfs_splice_read fs/splice.c:993 [inline] vfs_splice_read+0x2c8/0x3b0 fs/splice.c:962 splice_direct_to_actor+0x2a5/0xa30 fs/splice.c:1069 do_splice_direct+0x1af/0x280 fs/splice.c:1194 do_sendfile+0xb88/0x1390 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4339573a79 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffff9271428 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ffff9271430 RCX: 00007f4339573a79 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f43395e7610 R08: 0000000000000000 R09: 65732f636f72702f R10: 0800000080004105 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffff9271668 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fortify_panic+0x1c/0x20 lib/string_helpers.c:1031 Code: ba fd eb d7 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 23 de 65 fd 48 89 de 48 c7 c7 00 2c c8 8a e8 e4 28 49 fd <0f> 0b 66 90 f3 0f 1e fa 41 55 41 54 55 53 48 89 fb e8 fe dd 65 fd RSP: 0018:ffffc90003a1f7b8 EFLAGS: 00010282 RAX: 0000000000000023 RBX: ffffffff8a873580 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816aad20 RDI: 0000000000000005 RBP: ffff888019f16cb8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: 1ffff92000743efa R13: 0000000000000004 R14: ffff888078fa69c0 R15: ffffc90003a1f7f0 FS: 0000555556e72380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000456b30 CR3: 0000000079883000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. 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