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Bug 2033655 - glibc: Conversion from ISO-2022-JP-3 with iconv may emit spurious NUL character on state reset (#28524)
Summary: glibc: Conversion from ISO-2022-JP-3 with iconv may emit spurious NUL charact...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: glibc
Version: 8.6
Hardware: All
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Florian Weimer
QA Contact: Martin Coufal
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-12-17 14:41 UTC by Carlos O'Donell
Modified: 2023-07-18 14:30 UTC (History)
9 users (show)

Fixed In Version: glibc-2.28-184.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-05-10 15:18:10 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-106106 0 None None None 2021-12-17 14:44:19 UTC
Red Hat Product Errata RHBA-2022:2005 0 None None None 2022-05-10 15:18:31 UTC

Description Carlos O'Donell 2021-12-17 14:41:02 UTC 
In RHEL 8 we backported the fix for CVE-2021-3326 which contains a regression fixed  upstream in bug 28524: https://sourceware.org/bugzilla/show_bug.cgi?id=28524

We need to backuport this fix to ensure ISO-2022-JP-3 is fixed for customers using this character set.

commit ff012870b2c02a62598c04daa1e54632e020fd7d
Author: Nikita Popov <npv1310>
Date:   Tue Nov 2 13:21:42 2021 +0500

    gconv: Do not emit spurious NUL character in ISO-2022-JP-3 (bug 28524)
    
    Bugfix 27256 has introduced another issue:
    In conversion from ISO-2022-JP-3 encoding, it is possible
    to force iconv to emit extra NUL character on internal state reset.
    To do this, it is sufficient to feed iconv with escape sequence
    which switches active character set.
    The simplified check 'data->__statep->__count != ASCII_set'
    introduced by the aforementioned bugfix picks that case and
    behaves as if '\0' character has been queued thus emitting it.
    
    To eliminate this issue, these steps are taken:
    * Restore original condition
    '(data->__statep->__count & ~7) != ASCII_set'.
    It is necessary since bits 0-2 may contain
    number of buffered input characters.
    * Check that queued character is not NUL.
    Similar step is taken for main conversion loop.
    
    Bundled test case follows following logic:
    * Try to convert ISO-2022-JP-3 escape sequence
    switching active character set
    * Reset internal state by providing NULL as input buffer
    * Ensure that nothing has been converted.
    
    Signed-off-by: Nikita Popov <npv1310>
Comment 9 errata-xmlrpc 2022-05-10 15:18:10 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 (glibc 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/RHBA-2022:2005
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