tequilaOS/platform_system_core
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Mount selinuxfs when other filesystems are mounted

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Be consistent when mounting filesystems, and mount selinuxfs
at the same time other filesystems are mounted. In particular,
this ensures that a /sys/fs/selinux/null is available at early
boot, avoiding an unnecessary mknod call.

Change-Id: I01e6b3900f48b4cb3f12d8a928e1e95911524252
This commit is contained in:
Nick Kralevich 2016-03-03 10:40:12 -08:00
parent 17741bc85c
commit 3d9e273359
2 changed files with 11 additions and 12 deletions
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1
init/init.cpp
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@ -561,6 +561,7 @@ int main(int argc, char** argv) {
#define MAKE_STR(x) __STRING(x)
mount("proc", "/proc", "proc", 0, "hidepid=2,gid=" MAKE_STR(AID_READPROC));
mount("sysfs", "/sys", "sysfs", 0, NULL);
mount("selinuxfs", "/sys/fs/selinux", "selinuxfs", 0, NULL);
}
// We must have some place other than / to create the device nodes for

22
init/util.cpp
View file

@ -401,20 +401,18 @@ int wait_for_file(const char *filename, int timeout)
void open_devnull_stdio(void)
{
// Try to avoid the mknod() call if we can. Since SELinux makes
// a /dev/null replacement available for free, let's use it.
int fd = open("/sys/fs/selinux/null", O_RDWR);
if (fd == -1) {
// OOPS, /sys/fs/selinux/null isn't available, likely because
// /sys/fs/selinux isn't mounted. Fall back to mknod.
static const char *name = "/dev/__null__";
if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
fd = open(name, O_RDWR);
unlink(name);
}
if (fd == -1) {
exit(1);
}
/* Fail silently.
* stdout/stderr isn't available, and because
* klog_init() is called after open_devnull_stdio(), we can't
* log to dmesg. Reordering klog_init() to be called before
* open_devnull_stdio() isn't an option either, as then klog_fd
* will be assigned 0 or 1, which will end up getting clobbered
* by the code below. There's nowhere good to log.
*/
exit(1);
}
dup2(fd, 0);