Date: Sat, 5 Jan 2008 02:10:04 GMT From: "Zachary Loafman" <zachary.loafman@isilon.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/93396: dlopen crash with locked page Message-ID: <200801050210.m052A4xI041213@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR kern/93396; it has been noted by GNATS.
From: "Zachary Loafman" <zachary.loafman@isilon.com>
To: <bug-followup@FreeBSD.org>,
<fabien.thomas@netasq.com>
Cc:
Subject: Re: kern/93396: dlopen crash with locked page
Date: Fri, 4 Jan 2008 17:59:57 -0800
Testcase that takes out any RTLD interaction, demonstrates the problem
quickly, and works just fine if you take out the mlockall:
--
#include <sys/mman.h>
#include <sys/param.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define EXIT_IF(__cond, __str) do { if (__cond) { perror(__str);
exit(-1); } } while(0)
int
main()
{
char name[] =3D "/tmp/pr93396.XXXXXX";
char buf[PAGE_SIZE];
int rc, fd;
char *map;
fd =3D mkstemp(name);
EXIT_IF(fd < 0, "mkstemp");
rc =3D write(fd, buf, PAGE_SIZE);
EXIT_IF(rc < PAGE_SIZE, "write");
rc =3D mlockall(MCL_CURRENT | MCL_FUTURE);
EXIT_IF(rc, "mlockall");
map =3D mmap(NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0);
EXIT_IF(!map, "mmap");
rc =3D mprotect(map, PAGE_SIZE, PROT_READ|PROT_WRITE);
EXIT_IF(rc, "mprotect");
*map =3D 'a';
=09
return 0;
}
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200801050210.m052A4xI041213>