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Bug 1875597

Summary:	fwrite on stream opened with open_memstream() truncates the buffer size
Product:	Red Hat Enterprise Linux 7	Reporter:	Paulo Andrade <pandrade>
Component:	glibc	Assignee:	glibc team <glibc-bugzilla>
Status:	CLOSED WONTFIX	QA Contact:	qe-baseos-tools-bugs
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	7.8	CC:	ashankar, codonell, dj, fweimer, glibc-bugzilla, mnewsome, pfrankli, qe-baseos-tools-bugs, sipoyare
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1875596	Environment:
Last Closed:	2020-09-11 14:27:07 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1875596
Bug Blocks:

Description Paulo Andrade 2020-09-03 20:35:22 UTC

+++ This bug was initially created as a clone of Bug #1875596 +++

Current output:

"""
Running test: fopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: fmemopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: open_memstream()
position after fwrite: 24
position after SEEK_END: 4

open_memstream() final buffer size: 4
"""

Expected ouput:
"""
Running test: fopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: fmemopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: open_memstream()
position after fwrite: 24
position after SEEK_END: 24

open_memstream() final buffer size: 24
"""

  The seek to the start of the buffer, and write data smaller than
the stream length truncates the memory stream.

Comment 2 Carlos O'Donell 2020-09-11 14:27:07 UTC

Red Hat Enterprise Linux 7 has entered Maintenance Support 2 and as such we will not be fixing this issue in RHEL 7. The behaviour is not a regression in RHEL 7. We will be tracking this issue upstream and reviewing the RHEL 8 situation (bug 1875596). Closing as CLOSED/WONTFIX.