Bug 222177 – File::writable? gives incorrect result if process changes euid/egid

Bug 222177 - File::writable? gives incorrect result if process changes euid/egid

Summary:	File::writable? gives incorrect result if process changes euid/egid

Status:	CLOSED DEFERRED

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	ruby (Show other bugs)
Sub Component:
Version:	5.0
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Akira TAGOH
QA Contact:	Bill Huang
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:	229475
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Reported:	2007-01-10 14:09 EST by David Lutterkort
Modified:	2013-04-30 19:40 EDT (History)
CC List:	2 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2007-06-05 16:43:42 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Ruby script demonstrating the problem (run as root) (645 bytes, text/plain) 2007-01-10 14:09 EST, David Lutterkort	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description David Lutterkort 2007-01-10 14:09:33 EST

When a ruby script running as root changes euid/egid, the results of
File::writable?(f) and File::stat(f).writable? will differ because one uses
glibc's eaccess while the other doesn't (and File::writable? is wrong). The
attached program demonstrates the problem.

This bug is ultimately caused by a bug in glibc's eaccess
(http://sourceware.org/bugzilla/show_bug.cgi?id=3846) but it's a separate
regression in ruby-1.8.5 (compared to earlier versions of the ruby RPM) since
the ruby-1.8.5 rpm's now use eaccess where older ones used ruby's own code to
simulate eaccess.

A simple fix would be to build ruby w/o HAVE_EACCESS as it has been build in the
past until the glibc bug is fixed.

Comment 1 David Lutterkort 2007-01-10 14:09:33 EST

Created attachment 145276 [details]
Ruby script demonstrating the problem (run as root)

Comment 2 RHEL Product and Program Management 2007-06-05 16:43:42 EDT

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Since this
bugzilla is in a component that is not approved for the current
release, it has been closed with resolution deferred.  You may
reopen this bugzilla for consideration in the next release.

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