if (err)
goto out;
init_chdir("/.."); /* will traverse into overmounted root */
- ksys_chroot(".");
+ init_chroot(".");
out:
*(int *)p = err;
complete(&setup_done);
#include <linux/fs.h>
#include <linux/fs_struct.h>
#include <linux/init_syscalls.h>
+#include <linux/security.h>
#include "internal.h"
int __init init_mount(const char *dev_name, const char *dir_name,
return error;
}
+int __init init_chroot(const char *filename)
+{
+ struct path path;
+ int error;
+
+ error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
+ if (error)
+ return error;
+ error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+ if (error)
+ goto dput_and_out;
+ error = -EPERM;
+ if (!ns_capable(current_user_ns(), CAP_SYS_CHROOT))
+ goto dput_and_out;
+ error = security_path_chroot(&path);
+ if (error)
+ goto dput_and_out;
+ set_fs_root(current->fs, &path);
+dput_and_out:
+ path_put(&path);
+ return error;
+}
+
int __init init_unlink(const char *pathname)
{
return do_unlinkat(AT_FDCWD, getname_kernel(pathname));
return error;
}
-int ksys_chroot(const char __user *filename)
+SYSCALL_DEFINE1(chroot, const char __user *, filename)
{
struct path path;
int error;
return error;
}
-SYSCALL_DEFINE1(chroot, const char __user *, filename)
-{
- return ksys_chroot(filename);
-}
-
static int chmod_common(const struct path *path, umode_t mode)
{
struct inode *inode = path->dentry->d_inode;
const char *type_page, unsigned long flags, void *data_page);
int __init init_umount(const char *name, int flags);
int __init init_chdir(const char *filename);
+int __init init_chroot(const char *filename);
int __init init_unlink(const char *pathname);
int __init init_rmdir(const char *pathname);
* Instead, use one of the functions which work equivalently, such as
* the ksys_xyzyyz() functions prototyped below.
*/
-
-int ksys_chroot(const char __user *filename);
ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count);
int ksys_fchown(unsigned int fd, uid_t user, gid_t group);
ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count);
out:
devtmpfs_mount();
init_mount(".", "/", NULL, MS_MOVE, NULL);
- ksys_chroot(".");
+ init_chroot(".");
}
static bool is_tmpfs;
/* move initrd over / and chdir/chroot in initrd root */
init_chdir("/root");
init_mount(".", "/", NULL, MS_MOVE, NULL);
- ksys_chroot(".");
+ init_chroot(".");
ksys_setsid();
return 0;
}
/* move initrd to rootfs' /old */
init_mount("..", ".", NULL, MS_MOVE, NULL);
/* switch root and cwd back to / of rootfs */
- ksys_chroot("..");
+ init_chroot("..");
if (new_decode_dev(real_root_dev) == Root_RAM0) {
init_chdir("/old");