--- /dev/null
+/*
+ * Copyright (c) 2019 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
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * 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,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * 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/param.h>
+#include <sys/kernel.h>
+#include <sys/proc_internal.h>
+#include <sys/systm.h>
+#include <sys/systm.h>
+#include <sys/mount_internal.h>
+#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>
+
+#include <kern/chunklist.h>
+#include <kern/kalloc.h>
+
+#include <pexpert/pexpert.h>
+
+extern int read_file(const char *path, void **bufp, size_t *bufszp); /* implemented in imageboot.c */
+extern vnode_t imgboot_get_image_file(const char *path, off_t *fsize, int *errp); /* implemented in imageboot.c */
+
+#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)
+
+static const char *libkern_path = "/System/Library/Extensions/System.kext/PlugIns/Libkern.kext/Libkern";
+static const char *libkern_bundle = "com.apple.kpi.libkern";
+
+/*
+ * Rev1 chunklist handling
+ */
+const struct chunklist_pubkey rev1_chunklist_pubkeys[] = {
+};
+const size_t rev1_chunklist_num_pubkeys = sizeof(rev1_chunklist_pubkeys) / sizeof(rev1_chunklist_pubkeys[0]);
+
+static void
+key_byteswap(void *_dst, const void *_src, size_t len)
+{
+ uint32_t *dst __attribute__((align_value(1))) = _dst;
+ const uint32_t *src __attribute__((align_value(1))) = _src;
+
+ assert(len % sizeof(uint32_t) == 0);
+
+ len = len / sizeof(uint32_t);
+ for (size_t i = 0; i < len; i++) {
+ dst[len - i - 1] = OSSwapInt32(src[i]);
+ }
+}
+
+static int
+construct_chunklist_path(const char *root_path, char **bufp)
+{
+ int err = 0;
+ char *path = NULL;
+ size_t len = 0;
+
+ path = kalloc(MAXPATHLEN);
+ if (path == NULL) {
+ AUTHPRNT("failed to allocate space for chunklist path");
+ err = ENOMEM;
+ goto out;
+ }
+
+ len = strnlen(root_path, MAXPATHLEN);
+ if (len < MAXPATHLEN && len > strlen(".dmg")) {
+ /* correctly terminated string with space for extension */
+ } else {
+ AUTHPRNT("malformed root path");
+ err = EOVERFLOW;
+ goto out;
+ }
+
+ len = strlcpy(path, root_path, MAXPATHLEN);
+ if (len >= MAXPATHLEN) {
+ AUTHPRNT("root path is too long");
+ err = EOVERFLOW;
+ goto out;
+ }
+
+ path[len - strlen(".dmg")] = '\0';
+ len = strlcat(path, ".chunklist", MAXPATHLEN);
+ if (len >= MAXPATHLEN) {
+ AUTHPRNT("chunklist path is too long");
+ err = EOVERFLOW;
+ goto out;
+ }
+
+out:
+ if (err) {
+ kfree_safe(path);
+ } else {
+ *bufp = path;
+ }
+ return err;
+}
+
+static int
+validate_signature(const uint8_t *key_msb, size_t keylen, uint8_t *sig_msb, size_t siglen, uint8_t *digest)
+{
+ int err = 0;
+ bool sig_valid = false;
+ uint8_t *sig = NULL;
+
+ const uint8_t exponent[] = { 0x01, 0x00, 0x01 };
+ uint8_t *modulus = kalloc(keylen);
+ rsa_pub_ctx *rsa_ctx = kalloc(sizeof(rsa_pub_ctx));
+ sig = kalloc(siglen);
+
+ if (modulus == NULL || rsa_ctx == NULL || sig == NULL) {
+ err = ENOMEM;
+ goto out;
+ }
+
+ bzero(rsa_ctx, sizeof(rsa_pub_ctx));
+ key_byteswap(modulus, key_msb, keylen);
+ key_byteswap(sig, sig_msb, siglen);
+
+ err = rsa_make_pub(rsa_ctx,
+ sizeof(exponent), exponent,
+ CHUNKLIST_PUBKEY_LEN, modulus);
+ if (err) {
+ AUTHPRNT("rsa_make_pub() failed");
+ goto out;
+ }
+
+ err = rsa_verify_pkcs1v15(rsa_ctx, CC_DIGEST_OID_SHA256,
+ SHA256_DIGEST_LENGTH, digest,
+ siglen, sig,
+ &sig_valid);
+ if (err) {
+ sig_valid = false;
+ AUTHPRNT("rsa_verify() failed");
+ goto out;
+ }
+
+out:
+ kfree_safe(sig);
+ kfree_safe(rsa_ctx);
+ kfree_safe(modulus);
+
+ if (err) {
+ return err;
+ } else if (sig_valid == true) {
+ return 0; /* success */
+ } else {
+ return EAUTH;
+ }
+}
+
+static int
+validate_root_image(const char *root_path, void *chunklist)
+{
+ int err = 0;
+ struct chunklist_hdr *hdr = chunklist;
+ struct chunklist_chunk *chk = NULL;
+ size_t ch = 0;
+ struct vnode *vp = NULL;
+ off_t fsize = 0;
+ off_t offset = 0;
+ bool doclose = false;
+ size_t bufsz = 0;
+ void *buf = NULL;
+
+ vfs_context_t ctx = vfs_context_kernel();
+ kauth_cred_t kerncred = vfs_context_ucred(ctx);
+ proc_t p = vfs_context_proc(ctx);
+
+ AUTHDBG("validating root dmg %s", root_path);
+
+ vp = imgboot_get_image_file(root_path, &fsize, &err);
+ if (vp == NULL) {
+ goto out;
+ }
+
+ if ((err = VNOP_OPEN(vp, FREAD, ctx)) != 0) {
+ AUTHPRNT("failed to open vnode");
+ goto out;
+ }
+ doclose = true;
+
+ /*
+ * Iterate the chunk list and check each chunk
+ */
+ chk = chunklist + hdr->cl_chunk_offset;
+ for (ch = 0; ch < hdr->cl_chunk_count; ch++) {
+ int resid = 0;
+
+ if (!buf) {
+ /* allocate buffer based on first chunk size */
+ buf = kalloc(chk->chunk_size);
+ if (buf == NULL) {
+ err = ENOMEM;
+ goto out;
+ }
+ bufsz = chk->chunk_size;
+ }
+
+ if (chk->chunk_size > bufsz) {
+ AUTHPRNT("chunk size too big");
+ err = EINVAL;
+ goto out;
+ }
+
+ err = vn_rdwr(UIO_READ, vp, (caddr_t)buf, chk->chunk_size, offset, UIO_SYSSPACE, IO_NODELOCKED, kerncred, &resid, p);
+ if (err) {
+ AUTHPRNT("vn_rdrw fail (err = %d, resid = %d)", err, resid);
+ goto out;
+ }
+ if (resid) {
+ err = EINVAL;
+ AUTHPRNT("chunk covered non-existant part of image");
+ goto out;
+ }
+
+ /* calculate the SHA256 of this chunk */
+ uint8_t sha_digest[SHA256_DIGEST_LENGTH];
+ SHA256_CTX sha_ctx;
+ SHA256_Init(&sha_ctx);
+ SHA256_Update(&sha_ctx, buf, chk->chunk_size);
+ SHA256_Final(sha_digest, &sha_ctx);
+
+ /* Check the calculated SHA matches the chunk list */
+ if (bcmp(sha_digest, chk->chunk_sha256, SHA256_DIGEST_LENGTH) != 0) {
+ AUTHPRNT("SHA mismatch on chunk %lu (offset %lld, size %u)", ch, offset, chk->chunk_size);
+ err = EINVAL;
+ goto out;
+ }
+
+ if (os_add_overflow(offset, chk->chunk_size, &offset)) {
+ err = EINVAL;
+ goto out;
+ }
+ chk++;
+ }
+
+ if (offset != fsize) {
+ AUTHPRNT("chunklist did not cover entire file (offset = %lld, fsize = %lld)", offset, fsize);
+ err = EINVAL;
+ goto out;
+ }
+
+out:
+ kfree_safe(buf);
+ if (doclose) {
+ VNOP_CLOSE(vp, FREAD, ctx);
+ }
+ if (vp) {
+ vnode_put(vp);
+ vp = NULL;
+ }
+
+ return err;
+}
+
+static const uuid_t *
+getuuidfromheader_safe(const void *buf, size_t bufsz, size_t *uuidsz)
+{
+ const struct uuid_command *cmd = NULL;
+ const kernel_mach_header_t *mh = buf;
+
+ /* space for the header and at least one load command? */
+ if (bufsz < sizeof(kernel_mach_header_t) + sizeof(struct uuid_command)) {
+ AUTHPRNT("libkern image too small");
+ return NULL;
+ }
+
+ /* validate the mach header */
+ if (mh->magic != MH_MAGIC_64 || (mh->sizeofcmds > bufsz - sizeof(kernel_mach_header_t))) {
+ AUTHPRNT("invalid MachO header");
+ return NULL;
+ }
+
+ /* iterate the load commands */
+ size_t offset = sizeof(kernel_mach_header_t);
+ for (size_t i = 0; i < mh->ncmds; i++) {
+ cmd = buf + offset;
+
+ if (cmd->cmd == LC_UUID) {
+ *uuidsz = sizeof(cmd->uuid);
+ return &cmd->uuid;
+ }
+
+ if (os_add_overflow(cmd->cmdsize, offset, &offset) ||
+ offset > bufsz - sizeof(struct uuid_command)) {
+ return NULL;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Rev2 chunklist handling
+ */
+const struct chunklist_pubkey rev2_chunklist_pubkeys[] = {
+};
+const size_t rev2_chunklist_num_pubkeys = sizeof(rev2_chunklist_pubkeys) / sizeof(rev2_chunklist_pubkeys[0]);
+
+static const struct efi_guid_t gEfiSignAppleCertTypeGuid = CHUNKLIST_REV2_SIG_HASH_GUID;
+static const struct efi_guid_t gEfiSignCertTypeRsa2048Sha256Guid = EFI_CERT_TYPE_RSA2048_SHA256;
+
+static boolean_t
+validate_rev2_certificate(struct rev2_chunklist_certificate *certificate)
+{
+ /* Default value of current security epoch MUST be CHUNKLIST_MIN_SECURITY_EPOCH */
+ uint8_t current_security_epoch = CHUNKLIST_MIN_SECURITY_EPOCH;
+
+ /* Certificate.Length must be equal to sizeof(CERTIFICATE) */
+ if (certificate->length != sizeof(struct rev2_chunklist_certificate)) {
+ AUTHDBG("invalid certificate length");
+ return FALSE;
+ }
+
+ /* Certificate.Revision MUST be equal to 2 */
+ if (certificate->revision != 2) {
+ AUTHDBG("invalid certificate revision");
+ return FALSE;
+ }
+
+ /* Certificate.SecurityEpoch MUST be current or higher */
+ if (PE_parse_boot_argn(CHUNKLIST_SECURITY_EPOCH, ¤t_security_epoch, sizeof(current_security_epoch)) &&
+ certificate->security_epoch < current_security_epoch) {
+ AUTHDBG("invalid certificate security epoch");
+ return FALSE;
+ }
+
+ /* Certificate.CertificateType MUST be equal to WIN_CERT_TYPE_EFI_GUID (0x0EF1) */
+ if (certificate->certificate_type != WIN_CERT_TYPE_EFI_GUID) {
+ AUTHDBG("invalid certificate type");
+ return FALSE;
+ }
+
+ /* Certificate.CertificateGuid MUST be equal to 45E7BC51-913C-42AC-96A2-10712FFBEBA7 */
+ if (0 != memcmp(&certificate->certificate_guid, &gEfiSignAppleCertTypeGuid, sizeof(struct efi_guid_t))) {
+ AUTHDBG("invalid certificate GUID");
+ return FALSE;
+ }
+
+ /* Certificate.HashTypeGuid MUST be equal to A7717414-C616-4977-9420-844712A735BF */
+ if (0 != memcmp(&certificate->hash_type_guid, &gEfiSignCertTypeRsa2048Sha256Guid, sizeof(struct efi_guid_t))) {
+ AUTHDBG("invalid hash type GUID");
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static int
+validate_rev2_chunklist(uint8_t *buffer, size_t buffer_size)
+{
+ struct rev2_chunklist_certificate *certificate;
+ size_t security_data_offset;
+
+ /* Check input parameters to be sane */
+ if (buffer == NULL || buffer_size == 0) {
+ AUTHDBG("invalid parameter");
+ return EINVAL;
+ }
+
+ /* Check for existing signature */
+ if (buffer_size < sizeof(struct rev2_chunklist_certificate)) {
+ AUTHDBG("no space for certificate");
+ return EINVAL;
+ }
+
+ security_data_offset = buffer_size - sizeof(struct rev2_chunklist_certificate);
+ certificate = (struct rev2_chunklist_certificate*)(buffer + security_data_offset);
+
+ /* Check signature candidate to be a valid rev2 chunklist certificate */
+ if (TRUE != validate_rev2_certificate(certificate)) {
+ return EINVAL;
+ }
+
+ /* Check public key to be trusted */
+ for (size_t i = 0; i < rev2_chunklist_num_pubkeys; i++) {
+ const struct chunklist_pubkey *key = &rev2_chunklist_pubkeys[i];
+ /* Production keys are always trusted */
+ if (key->is_production != TRUE) {
+ uint8_t no_rev2_dev = 0;
+ /* Do not trust rev2 development keys if CHUNKLIST_NO_REV2_DEV is present */
+ if (PE_parse_boot_argn(CHUNKLIST_NO_REV2_DEV, &no_rev2_dev, sizeof(no_rev2_dev))) {
+ AUTHDBG("rev2 development key is not trusted");
+ continue;
+ }
+ }
+
+ /* Check certificate public key to be the trusted one */
+ if (0 == memcmp(key->key, certificate->rsa_public_key, sizeof(certificate->rsa_public_key))) {
+ AUTHDBG("certificate public key is trusted");
+
+ /* Hash everything but signature */
+ SHA256_CTX hash_ctx;
+ SHA256_Init(&hash_ctx);
+ SHA256_Update(&hash_ctx, buffer, security_data_offset);
+
+ /* Include Certificate.SecurityEpoch value */
+ SHA256_Update(&hash_ctx, &certificate->security_epoch, sizeof(certificate->security_epoch));
+
+ /* Finalize hashing into the output buffer */
+ uint8_t sha_digest[SHA256_DIGEST_LENGTH];
+ SHA256_Final(sha_digest, &hash_ctx);
+
+ /* Validate signature */
+ return validate_signature(certificate->rsa_public_key,
+ sizeof(certificate->rsa_public_key),
+ certificate->rsa_signature,
+ sizeof(certificate->rsa_signature),
+ sha_digest);
+ }
+ }
+
+ AUTHDBG("certificate public key is not trusted");
+ return EINVAL;
+}
+
+/*
+ * Main chunklist validation routine
+ */
+static int
+validate_chunklist(void *buf, size_t len)
+{
+ int err = 0;
+ size_t sigsz = 0;
+ size_t sig_end = 0;
+ size_t chunks_end = 0;
+ size_t sig_len = 0;
+ boolean_t valid_sig = FALSE;
+ struct chunklist_hdr *hdr = buf;
+
+ if (len < sizeof(struct chunklist_hdr)) {
+ AUTHPRNT("no space for header");
+ return EINVAL;
+ }
+
+ /* recognized file format? */
+ if (hdr->cl_magic != CHUNKLIST_MAGIC ||
+ hdr->cl_file_ver != CHUNKLIST_FILE_VERSION_10 ||
+ hdr->cl_chunk_method != CHUNKLIST_CHUNK_METHOD_10) {
+ AUTHPRNT("unrecognized chunklist format");
+ return EINVAL;
+ }
+
+ /* determine signature length based on signature method */
+ if (hdr->cl_sig_method == CHUNKLIST_SIGNATURE_METHOD_REV1) {
+ AUTHPRNT("rev1 chunklist");
+ sig_len = CHUNKLIST_REV1_SIG_LEN;
+ } else if (hdr->cl_sig_method == CHUNKLIST_SIGNATURE_METHOD_REV2) {
+ AUTHPRNT("rev2 chunklist");
+ sig_len = CHUNKLIST_REV2_SIG_LEN;
+ } else {
+ AUTHPRNT("unrecognized chunklist signature method");
+ return EINVAL;
+ }
+
+ /* does the chunk list fall within the bounds of the buffer? */
+ if (os_mul_and_add_overflow(hdr->cl_chunk_count, sizeof(struct chunklist_chunk), hdr->cl_chunk_offset, &chunks_end) ||
+ hdr->cl_chunk_offset < sizeof(struct chunklist_hdr) || chunks_end > len) {
+ AUTHPRNT("invalid chunk_count (%llu) or chunk_offset (%llu)",
+ hdr->cl_chunk_count, hdr->cl_chunk_offset);
+ return EINVAL;
+ }
+
+ /* does the signature fall within the bounds of the buffer? */
+ if (os_add_overflow(hdr->cl_sig_offset, sig_len, &sig_end) ||
+ hdr->cl_sig_offset < sizeof(struct chunklist_hdr) ||
+ hdr->cl_sig_offset < chunks_end ||
+ hdr->cl_sig_offset > len) {
+ AUTHPRNT("invalid signature offset (%llu)", hdr->cl_sig_offset);
+ return EINVAL;
+ }
+
+ if (sig_end > len ||
+ os_sub_overflow(len, hdr->cl_sig_offset, &sigsz) ||
+ sigsz != sig_len) {
+ /* missing or incorrect signature size */
+ return EINVAL;
+ }
+
+ /* validate rev1 chunklist */
+ if (hdr->cl_sig_method == CHUNKLIST_SIGNATURE_METHOD_REV1) {
+ /* Do not trust rev1 chunklists if CHUNKLIST_NO_REV1 is present */
+ uint8_t no_rev1;
+ if (PE_parse_boot_argn(CHUNKLIST_NO_REV1, &no_rev1, sizeof(no_rev1))) {
+ AUTHDBG("rev1 chunklists are not trusted");
+ return EINVAL;
+ }
+
+ /* hash the chunklist (excluding the signature) */
+ AUTHDBG("hashing rev1 chunklist");
+ uint8_t sha_digest[SHA256_DIGEST_LENGTH];
+ SHA256_CTX sha_ctx;
+ SHA256_Init(&sha_ctx);
+ SHA256_Update(&sha_ctx, buf, hdr->cl_sig_offset);
+ SHA256_Final(sha_digest, &sha_ctx);
+
+ AUTHDBG("validating rev1 chunklist signature against rev1 pub keys");
+ for (size_t i = 0; i < rev1_chunklist_num_pubkeys; i++) {
+ const struct chunklist_pubkey *key = &rev1_chunklist_pubkeys[i];
+ err = validate_signature(key->key, CHUNKLIST_PUBKEY_LEN, buf + hdr->cl_sig_offset, CHUNKLIST_SIGNATURE_LEN, sha_digest);
+ if (err == 0) {
+ AUTHDBG("validated rev1 chunklist signature with rev1 key %lu (prod=%d)", i, key->is_production);
+ valid_sig = key->is_production;
+#if IMAGEBOOT_ALLOW_DEVKEYS
+ if (!key->is_production) {
+ /* allow dev keys in dev builds only */
+ AUTHDBG("*** allowing DEV rev1 key: this will fail in customer builds ***");
+ valid_sig = TRUE;
+ }
+#endif
+ goto out;
+ }
+ }
+
+ /* At this point we tried all the keys: nothing went wrong but none of them
+ * signed our chunklist. */
+ AUTHPRNT("rev1 signature did not verify against any known rev1 public key");
+ } else if (hdr->cl_sig_method == CHUNKLIST_SIGNATURE_METHOD_REV2) {
+ AUTHDBG("validating rev2 chunklist signature against rev2 pub keys");
+ err = validate_rev2_chunklist(buf, len);
+ if (err) {
+ goto out;
+ }
+ valid_sig = TRUE;
+ }
+
+out:
+ if (err) {
+ return err;
+ } else if (valid_sig == TRUE) {
+ return 0; /* signed, and everything checked out */
+ } else {
+ return EINVAL;
+ }
+}
+
+/*
+ * Authenticate a given DMG file using chunklist
+ */
+int
+authenticate_root_with_chunklist(const char *root_path)
+{
+ char *chunklist_path = NULL;
+ void *chunklist_buf = NULL;
+ size_t chunklist_len = 32 * 1024 * 1024UL;
+ int err = 0;
+
+ err = construct_chunklist_path(root_path, &chunklist_path);
+ if (err) {
+ AUTHPRNT("failed creating chunklist path");
+ goto out;
+ }
+
+ AUTHDBG("validating root against chunklist %s", chunklist_path);
+
+ /*
+ * Read and authenticate the chunklist, then validate the root image against
+ * the chunklist.
+ */
+ AUTHDBG("reading chunklist");
+ err = read_file(chunklist_path, &chunklist_buf, &chunklist_len);
+ if (err) {
+ AUTHPRNT("failed to read chunklist");
+ goto out;
+ }
+
+ AUTHDBG("validating chunklist");
+ err = validate_chunklist(chunklist_buf, chunklist_len);
+ if (err) {
+ AUTHPRNT("failed to validate chunklist");
+ goto out;
+ }
+ AUTHDBG("successfully validated chunklist");
+
+ AUTHDBG("validating root image against chunklist");
+ err = validate_root_image(root_path, chunklist_buf);
+ if (err) {
+ AUTHPRNT("failed to validate root image against chunklist (%d)", err);
+ goto out;
+ }
+
+ /* everything checked out - go ahead and mount this */
+ AUTHDBG("root image authenticated");
+
+out:
+ kfree_safe(chunklist_buf);
+ kfree_safe(chunklist_path);
+ return err;
+}
+
+/*
+ * Check that the UUID of the libkern currently loaded matches the one on disk.
+ */
+int
+authenticate_root_version_check(void)
+{
+ int err = 0;
+ void *buf = NULL;
+ size_t bufsz = 4 * 1024 * 1024UL;
+
+ /* get the UUID of the libkern in /S/L/E */
+ err = read_file(libkern_path, &buf, &bufsz);
+ if (err) {
+ goto out;
+ }
+
+ unsigned long uuidsz = 0;
+ const uuid_t *img_uuid = getuuidfromheader_safe(buf, bufsz, &uuidsz);
+ if (img_uuid == NULL || uuidsz != sizeof(uuid_t)) {
+ AUTHPRNT("invalid UUID (sz = %lu)", uuidsz);
+ err = EINVAL;
+ goto out;
+ }
+
+ /* Get the UUID of the loaded libkern */
+ uuid_t live_uuid;
+ err = OSKextGetUUIDForName(libkern_bundle, live_uuid);
+ if (err) {
+ AUTHPRNT("could not find loaded libkern");
+ goto out;
+ }
+
+ /* ... and compare them */
+ if (bcmp(live_uuid, img_uuid, uuidsz) != 0) {
+ AUTHPRNT("UUID of running libkern does not match %s", libkern_path);
+
+ uuid_string_t img_uuid_str, live_uuid_str;
+ uuid_unparse(*img_uuid, img_uuid_str);
+ uuid_unparse(live_uuid, live_uuid_str);
+ AUTHPRNT("loaded libkern UUID = %s", live_uuid_str);
+ AUTHPRNT("on-disk libkern UUID = %s", img_uuid_str);
+
+ err = EINVAL;
+ goto out;
+ }
+
+ /* UUID matches! */
+out:
+ kfree_safe(buf);
+ return err;
+}
projects / apple / xnu.git / blobdiff