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FreeBSD-EN-19:09.xinstall                                       Errata Notice
                                                          The FreeBSD Project

Topic:          install(1) broken with partially matching relative paths

Category:       core
Module:         xinstall
Announced:      2019-05-14
Affects:        All supported versions of FreeBSD
Corrected:      2019-02-16 04:48:30 UTC (stable/12, 12.0-STABLE)
                2019-05-14 22:51:49 UTC (releng/12.0, 12.0-RELEASE-p4)
                2019-02-16 04:49:10 UTC (stable/11, 11.3-PRERELEASE)
                2019-05-14 22:51:49 UTC (releng/11.2, 11.2-RELEASE-p10)

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.

I.   Background

The install(1) utility installs files and links, optionally calculating
relative paths for an installed symbolic link.

II.  Problem Description

Due to an issue in the way install(1) determines common components of the
source and target paths, the relative link may be incorrectly calculated and
drop a component of the link because a partial match existed on that
component.

III. Impact

The ports tree and other software very frequently use install(1) to create
relative symlinks without checking whether a partial match of the path
exists that would result in such a truncation.

IV.  Workaround

No workaround is available, but using install(1) to install non-relative
links and files is unaffected.

V.   Solution

Perform one of the following:

1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.

2) To update your system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

3) To update your system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/EN-19:09/xinstall.patch
# fetch https://security.FreeBSD.org/patches/EN-19:09/xinstall.patch.asc
# gpg --verify xinstall.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/12/                                                        r344205
releng/12.0/                                                      r347585
stable/11/                                                        r344206
releng/11.2/                                                      r347585
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235330>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-19:09.xinstall.asc>
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