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Bug 1492780 - samba4: Recompile without BIND_NOW due to IFUNC relocation issue on ppc64
samba4: Recompile without BIND_NOW due to IFUNC relocation issue on ppc64
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: samba4 (Show other bugs)
6.9
ppc64 Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Andreas Schneider
ipa-qe
:
Depends On:
Blocks: 1374441 1461138 1504542
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Reported: 2017-09-18 11:34 EDT by Florian Weimer
Modified: 2018-06-19 01:16 EDT (History)
11 users (show)

See Also:
Fixed In Version: samba4-4.2.10-13.el6
Doc Type: Bug Fix
Doc Text:
Cause: The samba4 packages were compiled in such a way that lazy binding during dynamic linking was disabled at run time. Consequence: On POWER, the IFUNC handler for the gettimeofday function in glibc would execute when glibc itself had not been relocated, leading to a crash when sssd_pac and other programs were started. Fix: The samba4 packages are again compiled without lazy binding. Result: The lazy relocation of the gettimeofday function is processed correctly and sssd_pac can start successfully on POWER.
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Environment:
Last Closed: 2018-06-19 01:15:06 EDT
Type: Bug
Regression: ---
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Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:1883 None None None 2018-06-19 01:16 EDT

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Description Florian Weimer 2017-09-18 11:34:06 EDT 
/usr/lib64/samba/libsamba-debug-samba4.so is linked with BIND_NOW and references gettimeofday, which has an IFUNC resolver on ppc64.  However, on Red Hat Enterprise Linux 6, glibc processes relocations in the wrong order, so when the IFUNC resolver runs, libc.so.6 has not yet been relocated.  As a result, there is a crash during relocation.  See bug 1398716 for details.

We cannot change the dynamic linker behavior at this point in the Red Hat Enterprise Linux 6 product life-cycle, so the only way to fix this issue is to recompile samba4 without BIND_NOW.
Comment 12 errata-xmlrpc 2018-06-19 01:15:06 EDT 
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/RHSA-2018:1883
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