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Bug 661731 - kernel: Problem with execve(2) reintroduced [rhel-6.1] [rhel-6.0.z]
Summary: kernel: Problem with execve(2) reintroduced [rhel-6.1] [rhel-6.0.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.1
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Frantisek Hrbata
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On: 629178
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-12-09 14:37 UTC by RHEL Program Management
Modified: 2011-07-20 16:57 UTC (History)
15 users (show)

Fixed In Version: kernel-2.6.32-71.16.1.el6
Doc Type: Bug Fix
Doc Text:
Prior to this update, the execve utility exhibited the following flaw. When an argument and any environment data were copied from an old task's user stack to the user stack of a newly-execve'd task, the kernel would not allow the process to be interrupted or rescheduled. Therefore, when the argument or environment string data was (abnormally) large, there was no "interactivity" with the process while the execve() function was transferring the data. With this update, fatal signals (like CTRL+c) can now be received and handled and a process is allowed to yield to higher priority processes during the data transfer.
Clone Of:
Environment:
Last Closed: 2011-02-22 17:40:11 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:0283 0 normal SHIPPED_LIVE Moderate: kernel security, bug fix, and enhancement update 2011-02-22 17:38:22 UTC

Description RHEL Program Management 2010-12-09 14:37:23 UTC 
This bug has been copied from bug #629178 and has been proposed
to be backported to 6.0 z-stream (EUS).
Comment 7 Dave Anderson 2011-02-14 14:01:40 UTC 
It reproduces quite easily on my 1GB 2.6.32-70.el6.x86_64 machine:

# free -m
             total       used       free     shared    buffers     cached
Mem:           995        177        818          0          1         20
-/+ buffers/cache:        155        839
Swap:         2015         70       1945
# ulimit -s
unlimited
# uname -r
2.6.32-70.el6.x86_64
# ./bigstack1
bigstack1: allocating space for 20000000 strings -- please wait...
bigstack1: performing execve: enter CTRL-C to kill...
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C
#
Comment 9 errata-xmlrpc 2011-02-22 17:40:11 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 therefore 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-2011-0283.html
Comment 10 Martin Prpič 2011-02-23 15:06:26 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Prior to this update, the execve utility exhibited the following flaw. When an argument and any environment data were copied from an old task's user stack to the user stack of a newly-execve'd task, the kernel would not allow the process to be interrupted or rescheduled. Therefore, when the argument or environment string data was (abnormally) large, there was no "interactivity" with the process while the execve() function was transferring the data. With this update, fatal signals (like CTRL+c) can now be received and handled and a process is allowed to yield to higher priority processes during the data transfer.
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