xnu-7195.60.75.tar.gz

[apple/xnu.git] / libsyscall / wrappers / _libkernel_init.c

diff --git a/libsyscall/wrappers/_libkernel_init.c b/libsyscall/wrappers/_libkernel_init.c
index 127d65efd28b03ae0add409ef9ec44293efa2a20..6440b6098f6cd4cdf70795726ed3d7ff0ebf8388 100644 (file)
--- a/libsyscall/wrappers/_libkernel_init.c
+++ b/libsyscall/wrappers/_libkernel_init.c
@@ -35,10 +35,33 @@
 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")));
@@ -59,3 +82,42 @@ __libkernel_init(_libkernel_functions_t fns,
        }
        mach_init();
 }
+
+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__) */
+       }
+}