[Bug nptl/5476] New: fix stacksize overflow

[Bug nptl/5476] New: fix stacksize overflow

[wangf at cn dot fujitsu dot com]

I found a bug about the thread stack size overflow.

Here are procedures to reproduce this bug:

------------------------------------------
[root@localhost Temp]# cat test.c
#include <pthread.h>
#include <stdio.h>

int main(void)
{
	size_t stacksize;
	pthread_attr_t attr;

	pthread_attr_init(&attr);

	pthread_attr_getstacksize(&attr, &stacksize);

	printf("%lu\n", (unsigned long)stacksize);

	return 0;
}
----------------------------------------------------

[root@localhost Temp]# gcc -o test test.c -lpthread
[root@localhost Temp]# ulimit -s 1024
[root@localhost Temp]# ulimit -s
1024
[root@localhost Temp]# ./test
1048576
[root@localhost Temp]# ulimit -s $(( 0xffffffff / 1024 ))
[root@localhost Temp]# ulimit -s
4194303
[root@localhost Temp]# ./test
0

-- 
           Summary: fix stacksize overflow
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: wangf at cn dot fujitsu dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=5476

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[Bug nptl/5476] fix stacksize overflow

[wangf at cn dot fujitsu dot com]

------- Additional Comments From wangf at cn dot fujitsu dot com  2007-12-12 09:55 -------
Created an attachment (id=2133)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2133&action=view)
patch to fix the bug


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=5476

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[Bug nptl/5476] fix stacksize overflow

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2007-12-12 17:51 -------
This is a user bug.  I'm not going to add code to prevent the user from shooting
herself/himself in the foot.  Maybe sometimes it's useful.  There is a clearly
documented minimum stack size.  If it is not followed bad things can happen. 
So, don't do it.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


http://sourceware.org/bugzilla/show_bug.cgi?id=5476

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