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Bug 140487

Summary: [RHAS2.1] Bad declaration of __syscall_poll can cause bogus values for timeout to be passed to the kernel
Product: Red Hat Enterprise Linux 2.1 Reporter: Manish Singh <manish.singh>
Component: glibcAssignee: Jakub Jelinek <jakub>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 2.1CC: fweimer
Target Milestone: ---   
Target Release: ---   
Hardware: ia64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2005-04-28 15:16:04 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
Test case
none
Patch to glibc to fix this. none

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