* Copyright (c) 2000-2002 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@
*/
/*
* @OSF_COPYRIGHT@
*/
-/*
+/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
* All Rights Reserved.
- *
+ *
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
- *
+ *
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
+ *
* Carnegie Mellon requests users of this software to return to
- *
+ *
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
- *
+ *
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
*
*/
-#ifndef _MACH_VM_PROT_H_
-#define _MACH_VM_PROT_H_
+#ifndef _MACH_VM_PROT_H_
+#define _MACH_VM_PROT_H_
/*
* Types defined:
* vm_prot_t VM protection values.
*/
-typedef int vm_prot_t;
+typedef int vm_prot_t;
/*
* Protection values, defined as bits within the vm_prot_t type
*/
-#define VM_PROT_NONE ((vm_prot_t) 0x00)
+#define VM_PROT_NONE ((vm_prot_t) 0x00)
-#define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
-#define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
-#define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
-
-/*
- * For now we can only support no execute on stacks... too many
- * entries are marked w/o VM_PROT_EXECUTE that actually have code
- */
-#define STACK_ONLY_NX 1
+#define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
+#define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
+#define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
/*
* The default protection for newly-created virtual memory
*/
-#define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
+#define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
/*
* The maximum privileges possible, for parameter checking.
*/
-#define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
+#define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
/*
* An invalid protection value.
* looks like VM_PROT_ALL and then some.
*/
-#define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
+#define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
-/*
+/*
* When a caller finds that he cannot obtain write permission on a
* mapped entry, the following flag can be used. The entry will
* be made "needs copy" effectively copying the object (using COW),
* and write permission will be added to the maximum protections
- * for the associated entry.
- */
+ * for the associated entry.
+ */
#define VM_PROT_COPY ((vm_prot_t) 0x10)
* walking down the shadow chain.
*/
-#define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
+#define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
+
+#ifdef PRIVATE
+/*
+ * The caller wants this memory region treated as if it had a valid
+ * code signature.
+ */
+#define VM_PROT_TRUSTED ((vm_prot_t) 0x20)
+#endif /* PRIVATE */
+
+/*
+ * Another invalid protection value.
+ * Indicates that the other protection bits are to be applied as a mask
+ * against the actual protection bits of the map entry.
+ */
+#define VM_PROT_IS_MASK ((vm_prot_t) 0x40)
+
+/*
+ * Another invalid protection value to support execute-only protection.
+ * VM_PROT_STRIP_READ is a special marker that tells mprotect to not
+ * set VM_PROT_READ. We have to do it this way because existing code
+ * expects the system to set VM_PROT_READ if VM_PROT_EXECUTE is set.
+ * VM_PROT_EXECUTE_ONLY is just a convenience value to indicate that
+ * the memory should be executable and explicitly not readable. It will
+ * be ignored on platforms that do not support this type of protection.
+ */
+#define VM_PROT_STRIP_READ ((vm_prot_t) 0x80)
+#define VM_PROT_EXECUTE_ONLY (VM_PROT_EXECUTE|VM_PROT_STRIP_READ)
+
+#ifdef PRIVATE
+/*
+ * When using VM_PROT_COPY, fail instead of copying an executable mapping,
+ * since that could cause code-signing violations.
+ */
+#define VM_PROT_COPY_FAIL_IF_EXECUTABLE ((vm_prot_t)0x100)
+#endif /* PRIVATE */
-#endif /* _MACH_VM_PROT_H_ */
+#endif /* _MACH_VM_PROT_H_ */
projects / apple / xnu.git / blobdiff