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Sun, 28 Sep 2025 12:04:25 -0700 (PDT) Date: Sun, 28 Sep 2025 12:04:25 -0700 In-Reply-To: <68a68b57.050a0220.3d78fd.0012.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d986b9.a00a0220.102ee.002e.GAE@google.com> Subject: Forwarded: Re: [syzbot] [v9fs?] UBSAN: shift-out-of-bounds in v9fs_get_tree From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [v9fs?] UBSAN: shift-out-of-bounds in v9fs_get_tree Author: xandfury@gmail.com syzbot writes: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3ac864c2d9bb Add linux-next specific files for 20250818 > git tree: linux-next > console+strace: > kernel config: > dashboard link: > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f604= 9-1~exp1~20250616065826.132), Debian LLD 20.1.7 > syz repro: > C reproducer: > > Downloadable assets: > disk image: > vmlinux: > kernel image: > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+30c83da54e948f6e9436@syzkaller.appspotmail.com > > =E2=80=94=E2=80=94=E2=80=94=E2=80=94[ cut here ]=E2=80=94=E2=80=94=E2=80= =94=E2=80=94 > UBSAN: shift-out-of-bounds in fs/9p/vfs_super.c:57:22 > shift exponent 32 is too large for 32-bit type =E2=80=99int=E2=80=99 > CPU: 0 UID: 0 PID: 5861 Comm: syz-executor379 Not tainted 6.17.0-rc2-next= -20250818-syzkaller #0 PREEMPT(full)=20 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 07/12/2025 > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > ubsan_epilogue+0xa/0x40 lib/ubsan.c:233 > __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494 > v9fs_fill_super fs/9p/vfs_super.c:57 [inline] > v9fs_get_tree+0x957/0xa90 fs/9p/vfs_super.c:125 > vfs_get_tree+0x8f/0x2b0 fs/super.c:1752 > do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 > do_mount fs/namespace.c:4138 [inline] > __do_sys_mount fs/namespace.c:4349 [inline] > __se_sys_mount+0x317/0x410 fs/namespace.c:4326 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7ff35edd46a9 > Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffeee8a4078 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00002000000025c0 RCX: 00007ff35edd46a9 > RDX: 00002000000000c0 RSI: 00002000000025c0 RDI: 0000000000000000 > RBP: 0000200000000280 R08: 0000200000000280 R09: 00007ffeee8a4258 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff35ee1d017 > R13: 00007ffeee8a4248 R14: 0000000000000001 R15: 0000000000000001 > > =E2=80=94[ end trace ]=E2=80=94 > > > =E2=80=94 > This report is generated by a bot. It may contain errors. > See for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > 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=E2=80=99s 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 #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.gi= t master