mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Return true if the process can perform a chroot operation.
|
|
Copyright (C) 2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <support/check.h>
|
|
#include <support/namespace.h>
|
|
#include <support/support.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <xunistd.h>
|
|
|
|
static void
|
|
callback (void *closure)
|
|
{
|
|
int *result = closure;
|
|
struct stat64 before;
|
|
xstat ("/dev", &before);
|
|
if (chroot ("/dev") != 0)
|
|
{
|
|
*result = errno;
|
|
return;
|
|
}
|
|
struct stat64 after;
|
|
xstat ("/", &after);
|
|
TEST_VERIFY (before.st_dev == after.st_dev);
|
|
TEST_VERIFY (before.st_ino == after.st_ino);
|
|
*result = 0;
|
|
}
|
|
|
|
bool
|
|
support_can_chroot (void)
|
|
{
|
|
int *result = support_shared_allocate (sizeof (*result));
|
|
*result = 0;
|
|
support_isolate_in_subprocess (callback, result);
|
|
bool ok = *result == 0;
|
|
if (!ok)
|
|
{
|
|
static bool already_warned;
|
|
if (!already_warned)
|
|
{
|
|
already_warned = true;
|
|
errno = *result;
|
|
printf ("warning: this process does not support chroot: %m\n");
|
|
}
|
|
}
|
|
support_shared_free (result);
|
|
return ok;
|
|
}
|