Bug 140487 - [RHAS2.1] Bad declaration of __syscall_poll can cause bogus values for timeout to be passed to the kernel
Summary: [RHAS2.1] Bad declaration of __syscall_poll can cause bogus values for timeou...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: glibc
Version: 2.1
Hardware: ia64
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Brian Brock
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2004-11-23 01:09 UTC by Manish Singh
Modified: 2016-11-24 14:58 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2005-04-28 15:16:04 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Test case (193 bytes, text/plain)
2004-11-23 01:15 UTC, Manish Singh 		no flags Details
Patch to glibc to fix this. (460 bytes, patch)
2004-11-23 01:18 UTC, Manish Singh 		no flags Details | Diff
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2005:261 0 normal SHIPPED_LIVE Low: glibc security update 2005-04-28 04:00:00 UTC

Description Manish Singh 2004-11-23 01:09:22 UTC 
Declaration of __syscall_poll uses int for timeout, but the kernel
expects a long. This can cause a huge timeout to be passed to kernel
in some circumstances.
Comment 1 Manish Singh 2004-11-23 01:15:35 UTC 
Created attachment 107271 [details]
Test case

Compile with test case:

gcc -O0 -o testpoll testpoll.c

(-O0 is important)

Run. This is supposed to be an 8 millisecond timeout. It hangs, and the alarm
fires. If you strace:

poll(0, 0, 4294967304
)		  = -1 EINTR (Interrupted system call)
Comment 2 Manish Singh 2004-11-23 01:18:05 UTC 
Created attachment 107272 [details]
Patch to glibc to fix this.

This just makes the declaration match reality, so the compiler knows generate
the code to turn an int into a long safely.
Comment 3 Jakub Jelinek 2004-11-23 21:16:29 UTC 
Wonder why kernel chose long when POSIX requires int.
Anyway, fix scheduled for U7.
Comment 4 Jakub Jelinek 2005-02-15 14:04:58 UTC 
Should be fixed in glibc-2.2.4-32.19 in dist-2.1AS-errata-candidate.
Comment 5 John Flanagan 2005-04-28 15:16:04 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-261.html
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