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Bug 1596023

Summary: Dangling symlink /usr/lib/debug/usr/.dwz in 3.1330.0-693.21.1.el7.x86_64/usr/share/gdb/auto-load/bin -> usr/bin
Product: Red Hat Enterprise Linux 7 Reporter: Landy <landy.zhao>
Component: gdbAssignee: Jan Kratochvil <jan.kratochvil>
Status: CLOSED ERRATA QA Contact: Michal Kolar <mkolar>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.5CC: gdb-bugs, jan.kratochvil, landy.zhao, mcermak, ohudlick, sergiodj
Target Milestone: pre-dev-freeze   
Target Release: 7.6   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: gdb-7.6.1-114.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-10-30 08:09:58 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
rhbz1596023.patch none

Description Landy 2018-06-28 05:31:06 UTC 
Description of problem:
Open symlink found.
lrwxrwxrwx 1 root root  7 Apr 24 10:57 /usr/share/gdb/auto-load/bin -> usr/bin
lrwxrwxrwx 1 root root  8 Apr 24 10:57 /usr/share/gdb/auto-load/sbin -> usr/sbin
usr/bin and usr/sbin don't exist.

Version-Release number of selected component (if applicable):
gdb-7.6.1-100.el7_4.1.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. ls -ldL /usr/share/gdb/auto-load/bin
2. ls -ldL /usr/share/gdb/auto-load/sbin

Actual results:
ls: cannot access /usr/share/gdb/auto-load/bin: No such file or directory

Expected results:
Target exists.

Additional info:
Similar bug report for Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=999645
Comment 1 Landy 2018-06-28 05:31:52 UTC 
System version: 3.10.0-693.21.1.el7.x86_64
Comment 2 Jan Kratochvil 2018-06-28 14:04:25 UTC 
Dangling symlinks have been fixed by:
  https://src.fedoraproject.org/rpms/gdb/c/fbd3253d15a5a5119e2433e43357f8e9ef087931

But I do not see why it should be a real problem, do you have some case where the fix helps?

The fix has comment "mkdir to satisfy dangling symlinks build check" so maybe some Fedora build checking tool complained but I do not see that myself now.

Red Hat is sure trying to limit changes in stable RHEL releases which is what makes them stable.  This fix will be of course included in RHEL-8.0.
Comment 4 Landy 2018-06-29 01:45:46 UTC 
I have been told that the dangling symlinks bring privilege escalation risk to the system and been asked to deal with them.
Comment 5 Jan Kratochvil 2018-06-29 08:42:50 UTC 
QA: Not sure what test to make, this is outside of upstream GDB testsuite.
Maybe a test for dangling symlinks could be made in rpmbuild process but that may have many false positives.
Comment 7 Landy 2018-07-04 07:10:25 UTC 
Hi, Jan,
Do we have an opportunity to inluce the fix to RHEL 7 package update? If yes, could we get the date?
Comment 8 Jan Kratochvil 2018-07-04 08:34:08 UTC 
Created attachment 1456421 [details]
rhbz1596023.patch

I do not understand the "inluce" word. The fix is planned for RHEL-7.6 but there is no guarantee it will be in final RHEL-7.6. In no way I can disclose planned release date of anything, you can discuss that with TAM (Red Hat customer contact person).

If you want the fix itself it is attached. Please change Revision: if you rebuild your local gdb.rpm with that patch.
Comment 9 Michal Kolar 2018-07-10 07:28:40 UTC 
Reproduced against gdb-7.6.1-110.el7 and verified gdb-7.6.1-114.el7.
Comment 11 errata-xmlrpc 2018-10-30 08:09:58 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3080