X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/5ba3f43ea354af8ad55bea84372a2bc834d8757c..c3c9b80d004dbbfdf763edeb97968c6997e3b45b:/libsyscall/wrappers/_libkernel_init.c?ds=sidebyside

diff --git a/libsyscall/wrappers/_libkernel_init.c b/libsyscall/wrappers/_libkernel_init.c
index 3eb67853d..d1eac6f21 100644
--- a/libsyscall/wrappers/_libkernel_init.c
+++ b/libsyscall/wrappers/_libkernel_init.c
@@ -2,7 +2,7 @@
  * Copyright (c) 2010 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
@@ -11,10 +11,10 @@
  * 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,
@@ -22,7 +22,7 @@
  * 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@
  */
 
@@ -30,15 +30,39 @@
 #include <stdbool.h>
 #include <strings.h>
 #include <unistd.h>
+#include <mach/vm_page_size.h>
 #include "_libkernel_init.h"
 
 extern int mach_init(void);
 
 #if TARGET_OS_OSX
+
+#if !defined(__i386__)
+
+#include "system-version-compat-support.h"
+#include <sys/sysctl.h>
+
+extern bool _system_version_compat_check_path_suffix(const char *orig_path);
+extern int _system_version_compat_open_shim(int opened_fd, int openat_fd, const char *orig_path, int oflag, mode_t mode,
+    int (*close_syscall)(int), int (*open_syscall)(const char *, int, mode_t),
+    int (*openat_syscall)(int, const char *, int, mode_t),
+    int (*fcntl_syscall)(int, int, long));
+
+extern bool (*system_version_compat_check_path_suffix)(const char *orig_path);
+extern int (*system_version_compat_open_shim)(int opened_fd, int openat_fd, const char *orig_path, int oflag, mode_t mode,
+    int (*close_syscall)(int), int (*open_syscall)(const char *, int, mode_t),
+    int (*openat_syscall)(int, const char *, int, mode_t),
+    int (*fcntl_syscall)(int, int, long));
+
+extern system_version_compat_mode_t system_version_compat_mode;
+
+int  __sysctlbyname(const char *name, size_t namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen);
+#endif /* !defined(__i386__) */
+
 __attribute__((visibility("default")))
 extern bool _os_xbs_chrooted;
 bool _os_xbs_chrooted;
-#endif
+#endif /* TARGET_OS_OSX */
 
 /* dlsym() funcptr is for legacy support in exc_catcher */
 void* (*_dlsym)(void*, const char*) __attribute__((visibility("hidden")));
@@ -46,15 +70,68 @@ void* (*_dlsym)(void*, const char*) __attribute__((visibility("hidden")));
 __attribute__((visibility("hidden")))
 _libkernel_functions_t _libkernel_functions;
 
+
 void
 __libkernel_init(_libkernel_functions_t fns,
-		const char *envp[] __attribute__((unused)),
-		const char *apple[] __attribute__((unused)),
-		const struct ProgramVars *vars __attribute__((unused)))
+    const char *envp[] __attribute__((unused)),
+    const char *apple[] __attribute__((unused)),
+    const struct ProgramVars *vars __attribute__((unused)))
 {
 	_libkernel_functions = fns;
 	if (fns->dlsym) {
 		_dlsym = fns->dlsym;
 	}
 	mach_init();
+#if TARGET_OS_OSX
+	for (size_t i = 0; envp[i]; i++) {
+
+#if defined(__i386__) || defined(__x86_64__)
+		const char *VM_KERNEL_PAGE_SHIFT_ENV = "VM_KERNEL_PAGE_SIZE_4K=1";
+		if (vm_kernel_page_shift != 12 && strcmp(VM_KERNEL_PAGE_SHIFT_ENV, envp[i]) == 0) {
+			vm_kernel_page_shift = 12;
+			vm_kernel_page_size = 1 << vm_kernel_page_shift;
+			vm_kernel_page_mask = vm_kernel_page_size - 1;
+		}
+#endif /* defined(__i386__) || defined(__x86_64__) */
+	}
+#endif /* TARGET_OS_OSX */
+}
+
+void
+__libkernel_init_late(_libkernel_late_init_config_t config)
+{
+	if (config->version >= 1) {
+#if TARGET_OS_OSX && !defined(__i386__)
+		if (config->enable_system_version_compat) {
+			/* enable the version compatibility shim for this process (macOS only) */
+
+			/* first hook up the shims we reference from open{at}() */
+			system_version_compat_check_path_suffix = _system_version_compat_check_path_suffix;
+			system_version_compat_open_shim = _system_version_compat_open_shim;
+
+			system_version_compat_mode = SYSTEM_VERSION_COMPAT_MODE_MACOSX;
+
+			/*
+			 * tell the kernel the shim is enabled for this process so it can shim any
+			 * necessary sysctls
+			 */
+			int enable = 1;
+			__sysctlbyname("kern.system_version_compat", strlen("kern.system_version_compat"),
+			    NULL, NULL, &enable, sizeof(enable));
+		} else if ((config->version >= 2) && config->enable_ios_version_compat) {
+			/* enable the iOS ProductVersion compatibility shim for this process */
+
+			/* first hook up the shims we reference from open{at}() */
+			system_version_compat_check_path_suffix = _system_version_compat_check_path_suffix;
+			system_version_compat_open_shim = _system_version_compat_open_shim;
+
+			system_version_compat_mode = SYSTEM_VERSION_COMPAT_MODE_IOS;
+
+			/*
+			 * We don't currently shim any sysctls for iOS apps running on macOS so we
+			 * don't need to inform the kernel that this app has the SystemVersion shim enabled.
+			 */
+		}
+#endif /* TARGET_OS_OSX && !defined(__i386__) */
+	}
 }