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Mon, 27 Oct 2025 06:00:46 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 59R60kBL002802 for bugs@FreeBSD.org; Mon, 27 Oct 2025 06:00:46 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 290556] tar(8) may strip symlink target when reading from cd9660 filesystem Date: Mon, 27 Oct 2025 06:00:47 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: Unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: markus@stoffdv.at X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D290556 Bug ID: 290556 Summary: tar(8) may strip symlink target when reading from cd9660 filesystem Product: Base System Version: Unspecified Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: markus@stoffdv.at PROBLEM When creating a tarball from files on _some_ cd9660 filesystems (e.g. creat= ed by xorrisofs(1)), all symbolic links will be stripped of their link target: Expected: lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-1 -> /some/f= qfn lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-2 -> ../relp= ath lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-3 -> symlink= -1 Found: lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-1 ->=20=20 lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-2 ->=20=20 lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-3 ->=20=20 ANALYSIS Even if tar(1) drops the symlink target when reading from a cd9660 filesyst= em, it does extract them correctly from the device node or ISO image themselves. Note that this error does not occur when the ISO has been created with makefs(8): makefs -t cd9660 -o rockridge -o label=3DTARPIT /tmp/tarpit.iso /tmp/ta= rpit It does, however, occur when the image is created by xorrisofs(1): xorrisofs -rock -volid TARPIT -o /tmp/tarpit.iso /tmp/tarpit HOW TO REPRODUCE # We need xorrisofs(1) pkg install -y xorriso # Create ISO image with symlinks mkdir /tmp/tarpit ln -s /some/fqfn /tmp/tarpit/symlink-1 ln -s ../relpath /tmp/tarpit/symlink-2 ln -s symlink-1 /tmp/tarpit/symlink-3 xorrisofs -rock -volid TARPIT -o /tmp/tarpit.iso /tmp/tarpit # Mount ISO image dev=3D$(mdconfig /tmp/tarpit.iso) mount -t cd9660 /dev/iso9660/TARPIT # Validate filesystem contents ls -l /mnt # total 0 # lrwxr-xr-x 1 root wheel 0 27 Okt. 05:41 symlink-1 -> /some/fqfn # lrwxr-xr-x 1 root wheel 0 27 Okt. 05:41 symlink-2 -> ../relpath # lrwxr-xr-x 1 root wheel 0 27 Okt. 05:41 symlink-3 -> symlink-1 # Produces broken symlinks with the target component stripped away tar cf - -C /mnt . | tar tvf - # drwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./ # lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-1 ->=20 # lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-2 ->=20 # lrwxr-xr-x 0 root wheel 0 27 Okt. 05:41 ./symlink-3 ->=20 # Produces intact symlinks (directly from ISO device or image) tar tvf /dev/iso9660/TARPIT tar tvf /tmp/tarpit.iso # drwxr-xr-x 2 0 0 2048 27 Okt. 05:41 . # lrwxr-xr-x 1 0 0 0 27 Okt. 05:41 symlink-1 -> /some/f= qfn # lrwxr-xr-x 1 0 0 0 27 Okt. 05:41 symlink-2 -> ../relp= ath # lrwxr-xr-x 1 0 0 0 27 Okt. 05:41 symlink-3 -> symlink= -1 # Cleanup umount /mnt mdconfig -d -u "${dev#md}" --=20 You are receiving this mail because: You are the assignee for the bug.=