FreeBSD/Linux Kernel Cross Reference
sys/libkern/ptrauth_utils.c

     /*
      * Copyright (c) 2020 Apple 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 <IOKit/IOLib.h>
    #include <kern/debug.h> // for panic()
    
    #include <libkern/ptrauth_utils.h>
    
    /*
     * On ptrauth systems, ptrauth_utils_sign_blob_generic is implemented
     * in osfmk/arm64/machine_routines_asm.s
     */
    
    #if !__has_feature(ptrauth_calls)
    ptrauth_generic_signature_t
    ptrauth_utils_sign_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags)
    {
            return 0;
    }
    #endif // __has_feature(ptrauth_calls)
    
    
    /*
     * ptrauth_utils_auth_blob_generic
     *
     * Authenticate signature produced by ptrauth_utils_sign_blob_generic
     */
    
    #if __has_feature(ptrauth_calls)
    __attribute__((noinline))
    void
    ptrauth_utils_auth_blob_generic(const void * ptr, size_t len_bytes, uint64_t data, int flags, ptrauth_generic_signature_t signature)
    {
            ptrauth_generic_signature_t calculated_signature = 0;
    
            if (ptr == NULL) {
                    if (flags & PTRAUTH_NON_NULL) {
                            panic("ptrauth_utils_auth_blob_generic: ptr must not be NULL");
                    } else {
                            return;
                    }
            }
    
            if ((calculated_signature = ptrauth_utils_sign_blob_generic(ptr, len_bytes, data, flags)) == signature) {
                    return;
            } else {
                    panic("signature mismatch for %lu bytes at %p, calculated %lx vs %lx", len_bytes,
                        ptr,
                        calculated_signature,
                        signature);
            }
    }
    #else
    void
    ptrauth_utils_auth_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags, __unused ptrauth_generic_signature_t signature)
    {
            return;
    }
    #endif // __has_feature(ptrauth_calls)

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