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Type: Bug
Resolution: Unresolved
Priority: Normal
Fix Version/s: rhel-9.6
Affects Version/s: rhel-9.2.0
Component/s: glibc
Labels:
- pt-libraries-for-backport
- pt-libraries-for-review

Regression:
None
Severity:
Moderate
Commit Hashes:

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fa1b0d5e9f6e0353e16339430770a7a8824c0468
079ebf7624e7fd0ad7fe94a7176a2e132c996d86

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sprint_count:
1

Pool Team:

sst_pt_libraries
Sub-System Group:

ssg_platform_tools

Story Points:
3
Blocked:
False
Product Documentation Required:
Yes
Products:

Red Hat Enterprise Linux
Sprint:
SST PT Libraries Sprint 11

Preliminary Testing:
None
Test Coverage:
None

Release Note Type:
Bug Fix
Release Note Text:

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Cause (the user action or circumstances that trigger the bug): If the iconv program converts an input file to the same output file (specified using the -o option), it may truncate the file before processing is complete.
Consequence (what the user experience is when the bug occurs): The in-place conversion of sufficiently large files is not successful, corrupting the file.
Fix (what has changed to fix the bug; do not include overly technical details): The iconv program now automatically uses a temporary file if the input files and the output file overlap.
Result (what happens now that the patch is applied): In-place conversions of files are now possible, similar to GNU recode.

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Cause (the user action or circumstances that trigger the bug): If the iconv program converts an input file to the same output file (specified using the -o option), it may truncate the file before processing is complete. Consequence (what the user experience is when the bug occurs): The in-place conversion of sufficiently large files is not successful, corrupting the file. Fix (what has changed to fix the bug; do not include overly technical details): The iconv program now automatically uses a temporary file if the input files and the output file overlap. Result (what happens now that the patch is applied): In-place conversions of files are now possible, similar to GNU recode.
Release Note Status:
Proposed

Experience:
Architecture:

x86_64

PX Impact Score:
PX Priority Data:
SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None

What were you trying to do that didn't work?

Convert a file from ISO-8859-1 to UTF-8

Please provide the package NVR for which bug is seen:

glibc-common-2.34-60.el9.x86_64

How reproducible:

in house and by customer

Steps to reproduce

Test environment:
Release: Red Hat Enterprise Linux release 9.2 (Plow)
Kernel: 5.14.0-284.25.1.el9_2.x86_64
IP Address: 10.1.183.219
glibc-common: glibc-common-2.34-60.el9.x86_64
locale: en.US.ISO-8859-1

Below 32K:

[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 31000 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
31000
48258

32K and above:

[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32000 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32000
49800
[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32001 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32001
50012
[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32002 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32002
49938
[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32003 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32003
Bus error (core dumped)
28672