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Bug 1834816 - glibc: internal_end*ent in nss_compat may clobber errno, hiding ERANGE
Summary: glibc: internal_end*ent in nss_compat may clobber errno, hiding ERANGE
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: glibc
Version: 7.8
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Florian Weimer
QA Contact: qe-baseos-tools-bugs
URL:
Whiteboard:
Depends On:
Blocks: 1402403 1782203 1838037
TreeView+ depends on / blocked
 
Reported: 2020-05-12 13:25 UTC by Florian Weimer
Modified: 2020-10-05 08:32 UTC (History)
10 users (show)

Fixed In Version: glibc-2.17-317.el7
Doc Type: Bug Fix
Doc Text:
Cause: The nss_compat module overwrites the errno status with other spurious error codes during processing of password and group entries. Consequence: Password and group lookups can fail because the expected buffer resizing does not happen. Fix: nss_compat avoids overwriting critical errno values with other status codes during password and group lookups. Result: Resizing of the response buffer for password and group lookups works, and lookups suceed as expected.
Clone Of:
: 1836867 (view as bug list)
Environment:
Last Closed: 2020-09-29 19:20:26 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 5153 0 None closed Oddjob-mkhomedir fails when using NSS compat 2020-12-14 12:22:32 UTC
Red Hat Product Errata RHSA-2020:3861 0 None None None 2020-09-29 19:21:09 UTC
Sourceware 25976 0 P2 RESOLVED internal_end*ent in nss_compat may clobber errno, hiding ERANGE 2020-12-14 12:23:02 UTC

Internal Links: 1871393

Description Florian Weimer 2020-05-12 13:25:15 UTC 
The end*ent functions such as internal_endpwent call into the rest of glibc and other NSS modules, without saving errno around those calls. Since successful function calls can clobber errno, a critical ERANGE error can be masked, and the caller will not retry with a larger buffer, reporting a different error instead.
Comment 7 Sergey Kolosov 2020-06-27 13:08:25 UTC 
Verified, the bug has been fixed in glibc-2.17-317.el7
Comment 9 errata-xmlrpc 2020-09-29 19:20:26 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 (Low: glibc security, bug fix, and enhancement update), 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-2020:3861
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