* Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <sys/filedesc.h>
#include <sys/vnode_internal.h>
#include <sys/imageboot.h>
+#include <kern/assert.h>
+
+#include <sys/namei.h>
+#include <sys/fcntl.h>
+#include <sys/vnode.h>
+#include <sys/sysproto.h>
+#include <sys/csr.h>
+#include <miscfs/devfs/devfsdefs.h>
+#include <libkern/crypto/sha2.h>
+#include <libkern/crypto/rsa.h>
+#include <libkern/OSKextLibPrivate.h>
+
+#if CONFIG_IMAGEBOOT_IMG4
+#include <libkern/img4/interface.h>
+#include <img4/img4.h>
+#endif
+
+#include <kern/kalloc.h>
#include <pexpert/pexpert.h>
+#include <kern/chunklist.h>
extern struct filedesc filedesc0;
extern int (*mountroot)(void);
-extern char rootdevice[];
+extern char rootdevice[DEVMAXNAMESIZE];
+
+#if CONFIG_LOCKERBOOT
+typedef struct _locker_mount_args {
+ char lmnt_path[PATH_MAX];
+ uint16_t lmnt_preferred_hash;
+} locker_mount_args_t;
+#endif
#define DEBUG_IMAGEBOOT 0
#if DEBUG_IMAGEBOOT
-#define DBG_TRACE(...) printf(__VA_ARGS__)
+#define DBG_TRACE(...) printf("imageboot: " __VA_ARGS__)
#else
#define DBG_TRACE(...) do {} while(0)
#endif
-extern int di_root_image(const char *path, char devname[], dev_t *dev_p);
+#define AUTHDBG(fmt, args...) do { printf("%s: " fmt "\n", __func__, ##args); } while (0)
+#define AUTHPRNT(fmt, args...) do { printf("%s: " fmt "\n", __func__, ##args); } while (0)
+#define kfree_safe(x) do { if ((x)) { kfree_addr((x)); (x) = NULL; } } while (0)
+
+extern int di_root_image(const char *path, char *devname, size_t devsz, dev_t *dev_p);
+extern int di_root_ramfile_buf(void *buf, size_t bufsz, char *devname, size_t devsz, dev_t *dev_p);
+
+static boolean_t imageboot_setup_new(imageboot_type_t type);
+
+vnode_t imgboot_get_image_file(const char *path, off_t *fsize, int *errp); /* may be required by chunklist.c */
+int read_file(const char *path, void **bufp, size_t *bufszp); /* may be required by chunklist.c */
#define kIBFilePrefix "file://"
-int
+__private_extern__ int
+imageboot_format_is_valid(const char *root_path)
+{
+ return strncmp(root_path, kIBFilePrefix,
+ strlen(kIBFilePrefix)) == 0;
+}
+
+static void
+vnode_get_and_drop_always(vnode_t vp)
+{
+ vnode_getalways(vp);
+ vnode_rele(vp);
+ vnode_put(vp);
+}
+
+__private_extern__ imageboot_type_t
imageboot_needed(void)
{
- int result = 0;
+ imageboot_type_t result = IMAGEBOOT_NONE;
char *root_path = NULL;
DBG_TRACE("%s: checking for presence of root path\n", __FUNCTION__);
MALLOC_ZONE(root_path, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
- if (root_path == NULL)
+ if (root_path == NULL) {
panic("%s: M_NAMEI zone exhausted", __FUNCTION__);
+ }
+
+#if CONFIG_LOCKERBOOT
+ if (PE_parse_boot_argn(IMAGEBOOT_LOCKER_ARG, root_path, MAXPATHLEN)) {
+ result = IMAGEBOOT_LOCKER;
+ goto out;
+ }
+#endif
+
+ /* Check for first layer */
+ if (!(PE_parse_boot_argn("rp0", root_path, MAXPATHLEN) ||
+#if CONFIG_IMAGEBOOT_IMG4
+ PE_parse_boot_argn("arp0", root_path, MAXPATHLEN) ||
+#endif
+ PE_parse_boot_argn("rp", root_path, MAXPATHLEN) ||
+ PE_parse_boot_argn(IMAGEBOOT_ROOT_ARG, root_path, MAXPATHLEN) ||
+ PE_parse_boot_argn(IMAGEBOOT_AUTHROOT_ARG, root_path, MAXPATHLEN))) {
+ goto out;
+ }
+
+ /* Sanity-check first layer */
+ if (imageboot_format_is_valid(root_path)) {
+ DBG_TRACE("%s: Found %s\n", __FUNCTION__, root_path);
+ } else {
+ goto out;
+ }
+
+ result = IMAGEBOOT_DMG;
+
+ /* Check for second layer */
+ if (!(PE_parse_boot_argn("rp1", root_path, MAXPATHLEN) ||
+ PE_parse_boot_argn(IMAGEBOOT_CONTAINER_ARG, root_path, MAXPATHLEN))) {
+ goto out;
+ }
+
+ /* Sanity-check second layer */
+ if (imageboot_format_is_valid(root_path)) {
+ DBG_TRACE("%s: Found %s\n", __FUNCTION__, root_path);
+ } else {
+ panic("%s: Invalid URL scheme for %s\n",
+ __FUNCTION__, root_path);
+ }
+
+out:
+ FREE_ZONE(root_path, MAXPATHLEN, M_NAMEI);
+
+ return result;
+}
+
+
+/*
+ * Swaps in new root filesystem based on image path.
+ * Current root filesystem is removed from mount list and
+ * tagged MNTK_BACKS_ROOT, MNT_ROOTFS is cleared on it, and
+ * "rootvnode" is reset. Root vnode of currentroot filesystem
+ * is returned with usecount (no iocount).
+ */
+__private_extern__ int
+imageboot_mount_image(const char *root_path, int height, imageboot_type_t type)
+{
+ dev_t dev;
+ int error;
+ /*
+ * Need to stash this here since we may do a kernel_mount() on /, which will
+ * automatically update the rootvnode global. Note that vfs_mountroot() does
+ * not update that global, which is a bit weird.
+ */
+ vnode_t old_rootvnode = rootvnode;
+ vnode_t newdp;
+ mount_t new_rootfs;
+ boolean_t update_rootvnode = FALSE;
+
+ if (type == IMAGEBOOT_DMG) {
+ error = di_root_image(root_path, rootdevice, DEVMAXNAMESIZE, &dev);
+ if (error) {
+ panic("%s: di_root_image failed: %d\n", __FUNCTION__, error);
+ }
+
+ rootdev = dev;
+ mountroot = NULL;
+ printf("%s: root device 0x%x\n", __FUNCTION__, rootdev);
+ error = vfs_mountroot();
+ if (error != 0) {
+ panic("vfs_mountroot() failed.\n");
+ }
+
+ update_rootvnode = TRUE;
+ }
+#if CONFIG_LOCKERBOOT
+ else if (type == IMAGEBOOT_LOCKER) {
+ locker_mount_args_t *mntargs = kalloc(sizeof(*mntargs));
+ if (!mntargs) {
+ panic("could not alloc mount args");
+ }
+
+ strlcpy(mntargs->lmnt_path, root_path, sizeof(mntargs->lmnt_path));
+ mntargs->lmnt_preferred_hash = 0;
+
+ DBG_TRACE("%s: mounting locker: %s\n", __FUNCTION__, root_path);
+ error = kernel_mount(LOCKERFS_NAME, NULLVP, NULLVP, "/",
+ mntargs, sizeof(*mntargs), 0, 0, vfs_context_kernel());
+ if (error) {
+ panic("failed to mount locker: %d", error);
+ }
+ kfree(mntargs, sizeof(*mntargs));
+
+ /* Clear the old mount association. */
+ old_rootvnode->v_mountedhere = NULL;
+ rootvnode->v_mount->mnt_vnodecovered = NULL;
+ }
+#endif
+ else {
+ panic("invalid imageboot type: %d", type);
+ }
+
+ /*
+ * Get the vnode for '/'.
+ * Set fdp->fd_fd.fd_cdir to reference it.
+ */
+ if (VFS_ROOT(TAILQ_LAST(&mountlist, mntlist), &newdp, vfs_context_kernel())) {
+ panic("%s: cannot find root vnode", __FUNCTION__);
+ }
+ DBG_TRACE("%s: old root fsname: %s\n", __FUNCTION__, old_rootvnode->v_mount->mnt_vtable->vfc_name);
- if(PE_parse_boot_arg("rp", root_path) == TRUE) {
- /* Got it, now verify scheme */
+ if (old_rootvnode != NULL) {
+ /* remember the old rootvnode, but remove it from mountlist */
+ mount_t old_rootfs = old_rootvnode->v_mount;
- if (strncmp(root_path, kIBFilePrefix,
- strlen(kIBFilePrefix)) == 0) {
- DBG_TRACE("%s: Found %s\n", __FUNCTION__, root_path);
- result = 1;
+ mount_list_remove(old_rootfs);
+ mount_lock(old_rootfs);
+#ifdef CONFIG_IMGSRC_ACCESS
+ old_rootfs->mnt_kern_flag |= MNTK_BACKS_ROOT;
+#endif /* CONFIG_IMGSRC_ACCESS */
+ old_rootfs->mnt_flag &= ~MNT_ROOTFS;
+ mount_unlock(old_rootfs);
+ }
+
+ /* switch to the new rootvnode */
+ if (update_rootvnode) {
+ rootvnode = newdp;
+ }
+
+ new_rootfs = rootvnode->v_mount;
+ mount_lock(new_rootfs);
+ new_rootfs->mnt_flag |= MNT_ROOTFS;
+ mount_unlock(new_rootfs);
+
+ vnode_ref(newdp);
+ vnode_put(newdp);
+ filedesc0.fd_cdir = newdp;
+ DBG_TRACE("%s: root switched\n", __FUNCTION__);
+
+ if (old_rootvnode != NULL) {
+#ifdef CONFIG_IMGSRC_ACCESS
+ if (height >= 0 && PE_imgsrc_mount_supported()) {
+ imgsrc_rootvnodes[height] = old_rootvnode;
} else {
- DBG_TRACE("%s: Invalid URL scheme for %s\n",
- __FUNCTION__, root_path);
+ vnode_get_and_drop_always(old_rootvnode);
}
+#else
+#pragma unused(height)
+ vnode_get_and_drop_always(old_rootvnode);
+#endif /* CONFIG_IMGSRC_ACCESS */
+ }
+ return 0;
+}
+
+int
+read_file(const char *path, void **bufp, size_t *bufszp)
+{
+ int err = 0;
+ struct nameidata ndp = {};
+ struct vnode *vp = NULL;
+ off_t fsize = 0;
+ int resid = 0;
+ char *buf = NULL;
+ bool doclose = false;
+
+ vfs_context_t ctx = vfs_context_kernel();
+ proc_t p = vfs_context_proc(ctx);
+ kauth_cred_t kerncred = vfs_context_ucred(ctx);
+
+ NDINIT(&ndp, LOOKUP, OP_OPEN, LOCKLEAF, UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx);
+ if ((err = namei(&ndp)) != 0) {
+ AUTHPRNT("namei failed (%s) - %d", path, err);
+ goto out;
+ }
+ nameidone(&ndp);
+ vp = ndp.ni_vp;
+
+ if ((err = vnode_size(vp, &fsize, ctx)) != 0) {
+ AUTHPRNT("failed to get vnode size of %s - %d", path, err);
+ goto out;
+ }
+ if (fsize < 0) {
+ panic("negative file size");
+ }
+
+ if ((err = VNOP_OPEN(vp, FREAD, ctx)) != 0) {
+ AUTHPRNT("failed to open %s - %d", path, err);
+ goto out;
+ }
+ doclose = true;
+
+ /* if bufsz is non-zero, cap the read at bufsz bytes */
+ if (*bufszp && *bufszp < (size_t)fsize) {
+ fsize = *bufszp;
}
- FREE_ZONE(root_path, MAXPATHLEN, M_NAMEI);
- return (result);
+ buf = kalloc(fsize);
+ if (buf == NULL) {
+ err = ENOMEM;
+ goto out;
+ }
+
+ if ((err = vn_rdwr(UIO_READ, vp, (caddr_t)buf, fsize, 0, UIO_SYSSPACE, IO_NODELOCKED, kerncred, &resid, p)) != 0) {
+ AUTHPRNT("Cannot read %d bytes from %s - %d", (int)fsize, path, err);
+ goto out;
+ }
+
+ if (resid) {
+ /* didnt get everything we wanted */
+ AUTHPRNT("Short read of %d bytes from %s - %d", (int)fsize, path, resid);
+ err = EINVAL;
+ goto out;
+ }
+
+out:
+ if (doclose) {
+ VNOP_CLOSE(vp, FREAD, ctx);
+ }
+ if (vp) {
+ vnode_put(vp);
+ vp = NULL;
+ }
+
+ if (err) {
+ kfree_safe(buf);
+ } else {
+ *bufp = buf;
+ *bufszp = fsize;
+ }
+
+ return err;
}
+#if CONFIG_IMAGEBOOT_IMG4 || CONFIG_IMAGEBOOT_CHUNKLIST
+vnode_t
+imgboot_get_image_file(const char *path, off_t *fsize, int *errp)
+{
+ struct nameidata ndp = {};
+ vnode_t vp = NULL;
+ vfs_context_t ctx = vfs_context_kernel();
+ int err;
+
+ NDINIT(&ndp, LOOKUP, OP_OPEN, LOCKLEAF, UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx);
+ if ((err = namei(&ndp)) != 0) {
+ AUTHPRNT("Cannot find %s - error %d", path, err);
+ } else {
+ nameidone(&ndp);
+ vp = ndp.ni_vp;
+
+ if (vp->v_type != VREG) {
+ err = EINVAL;
+ AUTHPRNT("%s it not a regular file", path);
+ } else if (fsize) {
+ if ((err = vnode_size(vp, fsize, ctx)) != 0) {
+ AUTHPRNT("Cannot get file size of %s - error %d", path, err);
+ }
+ }
+ }
+
+ if (err) {
+ *errp = err;
+ vp = NULL;
+ }
+ return vp;
+}
+#endif /* CONFIG_IMAGEBOOT_CHUNKLIST || CONFIG_IMAGEBOOT_CHUNKLIST */
+
+#if CONFIG_IMAGEBOOT_IMG4
+
+#define APTICKET_NAME "apticket.der"
+
+static char *
+imgboot_get_apticket_path(const char *rootpath)
+{
+ size_t plen = strlen(rootpath) + sizeof(APTICKET_NAME);
+ char *path = kalloc(plen);
+
+ if (path) {
+ char *slash;
+
+ strlcpy(path, rootpath, plen);
+ slash = strrchr(path, '/');
+ if (slash == NULL) {
+ slash = path;
+ } else {
+ slash++;
+ }
+ strlcpy(slash, APTICKET_NAME, sizeof(APTICKET_NAME) + 1);
+ }
+ return path;
+}
+
+static int
+authenticate_root_with_img4(const char *rootpath)
+{
+ errno_t rv;
+ img4_t i4;
+ img4_payload_t i4pl;
+ vnode_t vp;
+ char *ticket_path;
+ size_t tcksz = 0;
+ void *tckbuf = NULL;
+
+ DBG_TRACE("Check %s\n", rootpath);
+
+ if (img4if == NULL) {
+ AUTHPRNT("AppleImage4 is not ready");
+ return EAGAIN;
+ }
+
+ ticket_path = imgboot_get_apticket_path(rootpath);
+ if (ticket_path == NULL) {
+ AUTHPRNT("Cannot construct ticket path - out of memory");
+ return ENOMEM;
+ }
+
+ rv = read_file(ticket_path, &tckbuf, &tcksz);
+ if (rv) {
+ AUTHPRNT("Cannot get a ticket from %s - %d\n", ticket_path, rv);
+ goto out_with_ticket_path;
+ }
+
+ DBG_TRACE("Got %d bytes of manifest from %s\n", (int)tcksz, ticket_path);
+
+ rv = img4_init(&i4, 0, tckbuf, tcksz, NULL);
+ if (rv) {
+ AUTHPRNT("Cannot initialise verification handle - error %d", rv);
+ goto out_with_ticket_bytes;
+ }
+
+ vp = imgboot_get_image_file(rootpath, NULL, &rv);
+ if (vp == NULL) {
+ /* Error message had been printed already */
+ goto out;
+ }
+
+ rv = img4_payload_init_with_vnode_4xnu(&i4pl, 'rosi', vp, I4PLF_UNWRAPPED);
+ if (rv) {
+ AUTHPRNT("failed to init payload: %d", rv);
+ goto out;
+ }
+
+ rv = img4_get_trusted_external_payload(&i4, &i4pl, IMG4_ENVIRONMENT_PPL, NULL, NULL);
+ if (rv) {
+ AUTHPRNT("failed to validate root image %s: %d", rootpath, rv);
+ }
+
+ img4_payload_destroy(&i4pl);
+out:
+ img4_destroy(&i4);
+out_with_ticket_bytes:
+ kfree_safe(tckbuf);
+out_with_ticket_path:
+ kfree_safe(ticket_path);
+ return rv;
+}
+#endif /* CONFIG_IMAGEBOOT_IMG4 */
+
/*
- * We know there's an image. Attach it, and
- * switch over to root off it
+ * Attach the image at 'path' as a ramdisk and mount it as our new rootfs.
+ * All existing mounts are first umounted.
+ */
+static int
+imageboot_mount_ramdisk(const char *path)
+{
+ int err = 0;
+ size_t bufsz = 0;
+ void *buf = NULL;
+ dev_t dev;
+ vnode_t newdp;
+ mount_t new_rootfs;
+
+ /* Read our target image from disk */
+ err = read_file(path, &buf, &bufsz);
+ if (err) {
+ printf("%s: failed: read_file() = %d\n", __func__, err);
+ goto out;
+ }
+ DBG_TRACE("%s: read '%s' sz = %lu\n", __func__, path, bufsz);
+
+#if CONFIG_IMGSRC_ACCESS
+ /* Re-add all root mounts to the mount list in the correct order... */
+ mount_list_remove(rootvnode->v_mount);
+ for (int i = 0; i < MAX_IMAGEBOOT_NESTING; i++) {
+ struct vnode *vn = imgsrc_rootvnodes[i];
+ if (vn) {
+ vnode_getalways(vn);
+ imgsrc_rootvnodes[i] = NULLVP;
+
+ mount_t mnt = vn->v_mount;
+ mount_lock(mnt);
+ mnt->mnt_flag |= MNT_ROOTFS;
+ mount_list_add(mnt);
+ mount_unlock(mnt);
+
+ vnode_rele(vn);
+ vnode_put(vn);
+ }
+ }
+ mount_list_add(rootvnode->v_mount);
+#endif
+
+ /* ... and unmount everything */
+ vnode_get_and_drop_always(rootvnode);
+ filedesc0.fd_cdir = NULL;
+ rootvnode = NULL;
+ vfs_unmountall();
+
+ /* Attach the ramfs image ... */
+ err = di_root_ramfile_buf(buf, bufsz, rootdevice, DEVMAXNAMESIZE, &dev);
+ if (err) {
+ printf("%s: failed: di_root_ramfile_buf() = %d\n", __func__, err);
+ goto out;
+ }
+
+ /* ... and mount it */
+ rootdev = dev;
+ mountroot = NULL;
+ err = vfs_mountroot();
+ if (err) {
+ printf("%s: failed: vfs_mountroot() = %d\n", __func__, err);
+ goto out;
+ }
+
+ /* Switch to new root vnode */
+ if (VFS_ROOT(TAILQ_LAST(&mountlist, mntlist), &newdp, vfs_context_kernel())) {
+ panic("%s: cannot find root vnode", __func__);
+ }
+ rootvnode = newdp;
+ rootvnode->v_flag |= VROOT;
+ new_rootfs = rootvnode->v_mount;
+ mount_lock(new_rootfs);
+ new_rootfs->mnt_flag |= MNT_ROOTFS;
+ mount_unlock(new_rootfs);
+
+ vnode_ref(newdp);
+ vnode_put(newdp);
+ filedesc0.fd_cdir = newdp;
+
+ DBG_TRACE("%s: root switched\n", __func__);
+
+out:
+ if (err) {
+ kfree_safe(buf);
+ }
+ return err;
+}
+
+/*
+ * If the path is in <file://> URL format then we allocate memory and decode it,
+ * otherwise return the same pointer.
*
- * NB: p is always kernproc
+ * Caller is expected to check if the pointers are different.
*/
+static char *
+url_to_path(char *url_path)
+{
+ char *path = url_path;
+ size_t len = strlen(kIBFilePrefix);
-int
-imageboot_setup()
+ if (strncmp(kIBFilePrefix, url_path, len) == 0) {
+ /* its a URL - remove the file:// prefix and percent-decode */
+ url_path += len;
+
+ len = strlen(url_path);
+ if (len) {
+ /* Make a copy of the path to URL-decode */
+ path = kalloc(len + 1);
+ if (path == NULL) {
+ panic("imageboot path allocation failed - cannot allocate %d bytes\n", (int)len);
+ }
+
+ strlcpy(path, url_path, len + 1);
+ url_decode(path);
+ } else {
+ panic("Bogus imageboot path URL - missing path\n");
+ }
+
+ DBG_TRACE("%s: root image URL <%s> becomes %s\n", __func__, url_path, path);
+ }
+
+ return path;
+}
+
+static boolean_t
+imageboot_setup_new(imageboot_type_t type)
+{
+ int error;
+ char *root_path = NULL;
+ int height = 0;
+ boolean_t done = FALSE;
+ boolean_t auth_root = TRUE;
+ boolean_t ramdisk_root = FALSE;
+
+ MALLOC_ZONE(root_path, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ assert(root_path != NULL);
+
+#if CONFIG_LOCKERBOOT
+ if (type == IMAGEBOOT_LOCKER) {
+ if (!PE_parse_boot_argn(IMAGEBOOT_LOCKER_ARG, root_path, MAXPATHLEN)) {
+ panic("locker boot with no locker given");
+ }
+
+ DBG_TRACE("%s: root fsname: %s\n", __FUNCTION__, rootvnode->v_mount->mnt_vtable->vfc_name);
+
+ /*
+ * The locker path is a path, not a URL, so just pass it directly to
+ * imageboot_mount_image().
+ */
+ error = imageboot_mount_image(root_path, 0, type);
+ if (error) {
+ panic("failed to mount system locker: %d", error);
+ }
+
+ done = TRUE;
+ goto out;
+ }
+#endif /* CONFIG_LOCKERBOOT */
+
+ unsigned imgboot_arg;
+ if (PE_parse_boot_argn("-rootdmg-ramdisk", &imgboot_arg, sizeof(imgboot_arg))) {
+ ramdisk_root = TRUE;
+ }
+
+ if (PE_parse_boot_argn(IMAGEBOOT_CONTAINER_ARG, root_path, MAXPATHLEN) == TRUE) {
+ printf("%s: container image url is %s\n", __FUNCTION__, root_path);
+ error = imageboot_mount_image(root_path, height, type);
+ if (error != 0) {
+ panic("Failed to mount container image.");
+ }
+
+ height++;
+ }
+
+ if (PE_parse_boot_argn(IMAGEBOOT_AUTHROOT_ARG, root_path, MAXPATHLEN) == FALSE &&
+ PE_parse_boot_argn(IMAGEBOOT_ROOT_ARG, root_path, MAXPATHLEN) == FALSE) {
+ if (height > 0) {
+ panic("%s specified without %s or %s?\n", IMAGEBOOT_CONTAINER_ARG, IMAGEBOOT_AUTHROOT_ARG, IMAGEBOOT_ROOT_ARG);
+ }
+ goto out;
+ }
+
+ printf("%s: root image URL is '%s'\n", __func__, root_path);
+
+#if CONFIG_CSR
+ if (auth_root && (csr_check(CSR_ALLOW_ANY_RECOVERY_OS) == 0)) {
+ AUTHPRNT("CSR_ALLOW_ANY_RECOVERY_OS set, skipping root image authentication");
+ auth_root = FALSE;
+ }
+#endif
+
+ /* Make a copy of the path to URL-decode */
+ char *path = url_to_path(root_path);
+ assert(path);
+
+#if CONFIG_IMAGEBOOT_CHUNKLIST
+ if (auth_root) {
+ AUTHDBG("authenticating root image at %s", path);
+ error = authenticate_root_with_chunklist(path);
+ if (error) {
+ panic("root image authentication failed (err = %d)\n", error);
+ }
+ AUTHDBG("successfully authenticated %s", path);
+ }
+#endif
+
+ if (ramdisk_root) {
+ error = imageboot_mount_ramdisk(path);
+ } else {
+ error = imageboot_mount_image(root_path, height, type);
+ }
+
+ if (path != root_path) {
+ kfree_safe(path);
+ }
+
+ if (error) {
+ panic("Failed to mount root image (err=%d, auth=%d, ramdisk=%d)\n",
+ error, auth_root, ramdisk_root);
+ }
+
+#if CONFIG_IMAGEBOOT_CHUNKLIST
+ if (auth_root) {
+ /* check that the image version matches the running kernel */
+ AUTHDBG("checking root image version");
+ error = authenticate_root_version_check();
+ if (error) {
+ panic("root image version check failed");
+ } else {
+ AUTHDBG("root image version matches kernel");
+ }
+ }
+#endif
+
+ done = TRUE;
+
+out:
+ FREE_ZONE(root_path, MAXPATHLEN, M_NAMEI);
+ return done;
+}
+
+__private_extern__ void
+imageboot_setup(imageboot_type_t type)
{
- dev_t dev;
int error = 0;
char *root_path = NULL;
DBG_TRACE("%s: entry\n", __FUNCTION__);
+ if (rootvnode == NULL) {
+ panic("imageboot_setup: rootvnode is NULL.");
+ }
+
+ /*
+ * New boot-arg scheme:
+ * root-dmg : the dmg that will be the root filesystem, authenticated by default.
+ * auth-root-dmg : same as root-dmg.
+ * container-dmg : an optional dmg that contains the root-dmg.
+ * locker : the locker that will be the root filesystem -- mutually
+ * exclusive with any other boot-arg.
+ */
+ if (imageboot_setup_new(type)) {
+ return;
+ }
+
MALLOC_ZONE(root_path, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
- if (root_path == NULL)
- return (ENOMEM);
+ assert(root_path != NULL);
- if(PE_parse_boot_arg("rp", root_path) == FALSE) {
- error = ENOENT;
- goto done;
+ /*
+ * Look for outermost disk image to root from. If we're doing a nested boot,
+ * there's some sense in which the outer image never needs to be the root filesystem,
+ * but it does need very similar treatment: it must not be unmounted, needs a fake
+ * device vnode created for it, and should not show up in getfsstat() until exposed
+ * with MNT_IMGSRC. We just make it the temporary root.
+ */
+#if CONFIG_IMAGEBOOT_IMG4
+ if (PE_parse_boot_argn("arp0", root_path, MAXPATHLEN)) {
+ char *path = url_to_path(root_path);
+
+ assert(path);
+
+ if (authenticate_root_with_img4(path)) {
+ panic("Root image %s does not match the manifest\n", root_path);
+ }
+ if (path != root_path) {
+ kfree_safe(path);
+ }
+ } else
+#endif /* CONFIG_IMAGEBOOT_IMG4 */
+ if ((PE_parse_boot_argn("rp", root_path, MAXPATHLEN) == FALSE) &&
+ (PE_parse_boot_argn("rp0", root_path, MAXPATHLEN) == FALSE)) {
+ panic("%s: no valid path to image.\n", __FUNCTION__);
}
- printf("%s: root image url is %s\n", __FUNCTION__, root_path);
- error = di_root_image(root_path, rootdevice, &dev);
- if(error) {
- printf("%s: di_root_image failed: %d\n", __FUNCTION__, error);
- goto done;
+ DBG_TRACE("%s: root image url is %s\n", __FUNCTION__, root_path);
+
+ error = imageboot_mount_image(root_path, 0, type);
+ if (error) {
+ panic("Failed on first stage of imageboot.");
}
- rootdev = dev;
- mountroot = NULL;
- printf("%s: root device 0x%x\n", __FUNCTION__, rootdev);
- error = vfs_mountroot();
+ /*
+ * See if we are rooting from a nested image
+ */
+ if (PE_parse_boot_argn("rp1", root_path, MAXPATHLEN) == FALSE) {
+ goto done;
+ }
- if (error == 0 && rootvnode != NULL) {
- struct vnode *tvp;
- struct vnode *newdp;
+ printf("%s: second level root image url is %s\n", __FUNCTION__, root_path);
- /*
- * Get the vnode for '/'.
- * Set fdp->fd_fd.fd_cdir to reference it.
- */
- if (VFS_ROOT(TAILQ_LAST(&mountlist,mntlist), &newdp, vfs_context_kernel()))
- panic("%s: cannot find root vnode", __FUNCTION__);
-
- vnode_ref(newdp);
- vnode_put(newdp);
- tvp = rootvnode;
- vnode_rele(tvp);
- filedesc0.fd_cdir = newdp;
- rootvnode = newdp;
- mount_list_lock();
- TAILQ_REMOVE(&mountlist, TAILQ_FIRST(&mountlist), mnt_list);
- mount_list_unlock();
- mountlist.tqh_first->mnt_flag |= MNT_ROOTFS;
- DBG_TRACE("%s: root switched\n", __FUNCTION__);
+ /*
+ * If we fail to set up second image, it's not a given that we
+ * can safely root off the first.
+ */
+ error = imageboot_mount_image(root_path, 1, type);
+ if (error) {
+ panic("Failed on second stage of imageboot.");
}
+
done:
FREE_ZONE(root_path, MAXPATHLEN, M_NAMEI);
DBG_TRACE("%s: exit\n", __FUNCTION__);
- return (error);
+ return;
}
projects / apple / xnu.git / blobdiff