On Tue, Jul 14, 2009 at 09:47:44PM -0700, Sukadev Bhattiprolu wrote:
> I am not too familiar with libvirt implementation, but do you think it
> is possible to repro this using ns_exec and fewer/minimal namespaces ?
Just run the program below. 2.6.29 oopses when the child tries to open
/dev/console. Possibly can be stripped down even further but I think
it's fairly minimal anyway.
BTW, I guess the patch should set ERR_PTR(-EIO) or something, instead
of NULL, am I right?
Best regards,
Grzegorz Nosek
/*------------- cut ------------*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <unistd.h>
#include <linux/fs.h>
void dummy(int sig)
{
}
static int child(void *unused)
{
signal(SIGINT, dummy);
signal(SIGHUP, dummy);
pause(); /* cheesy synchronisation to wait for /dev/pts/0 to appear */
mount("/dev/pts/0", "/dev/console", NULL, MS_BIND, NULL);
sleep(2);
open("/dev/console", O_RDWR);
dup(0);
dup(0);
write(1, "Hello world!\n", sizeof("Hello world!\n")-1);
return 0;
}
int main(void)
{
pid_t pid;
char *stack;
int fd;
stack = malloc(16384);
pid = clone(child, stack+16384, CLONE_NEWNS|SIGCHLD, NULL);
fd = open("/dev/ptmx", O_RDWR|O_NOCTTY|O_NONBLOCK);
unlockpt(fd);
grantpt(fd);
kill(pid, SIGHUP);
sleep(1);
return 0; /* exit before child opens /dev/console */
}
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