xnu-4903.241.1.tar.gz

[apple/xnu.git] / libkern / os / log_encode.h

diff --git a/libkern/os/log_encode.h b/libkern/os/log_encode.h
index 88839fbd79f10816f2f7a2a2ddcbce87545b4147..d214bab2100ed22ffa1e84b7406154056e7013f9 100644 (file)
--- a/libkern/os/log_encode.h
+++ b/libkern/os/log_encode.h
@@ -27,8 +27,14 @@
 #include "log_encode_types.h"
 #include <sys/param.h>
 
-#if KERNEL
+#if __has_feature(ptrauth_calls)
+#include <mach/vm_param.h>
+#include <ptrauth.h>
+#endif /* __has_feature(ptrauth_calls) */
+
+#ifdef KERNEL
 #define isdigit(ch) (((ch) >= '0') && ((ch) <= '9'))
+extern boolean_t doprnt_hide_pointers;
 #endif
 
 static bool
@@ -138,7 +144,7 @@ _os_log_parse_annotated(char *annotated, const char **visibility, const char **l
 
 OS_ALWAYS_INLINE
 static inline bool
-_os_log_encode_arg(const void *arg, uint16_t arg_len, os_log_value_type_t ctype, bool is_private, os_log_buffer_context_t context)
+_os_log_encode_arg(void *arg, uint16_t arg_len, os_log_value_type_t ctype, bool is_private, os_log_buffer_context_t context)
 {
     os_log_buffer_value_t content = (os_log_buffer_value_t) &context->buffer->content[context->content_off];
     size_t content_sz = sizeof(*content) + arg_len;
@@ -146,7 +152,30 @@ _os_log_encode_arg(const void *arg, uint16_t arg_len, os_log_value_type_t ctype,
 #ifndef KERNEL
     bool obj_private = true;
 #endif
-    
+
+#ifdef KERNEL
+    /* scrub kernel pointers */
+    if (doprnt_hide_pointers &&
+            ctype == OS_LOG_BUFFER_VALUE_TYPE_SCALAR &&
+            arg_len >= sizeof(void *)) {
+        unsigned long long value = 0;
+        memcpy(&value, arg, arg_len);
+
+#if __has_feature(ptrauth_calls)
+                       /**
+                        * Strip out the pointer authentication code before
+                        * checking whether the pointer is a kernel address.
+                        */
+                       value = (unsigned long long)VM_KERNEL_STRIP_PTR(value);
+#endif /* __has_feature(ptrauth_calls) */
+
+        if (value >= VM_MIN_KERNEL_AND_KEXT_ADDRESS && value <= VM_MAX_KERNEL_ADDRESS) {
+            is_private = true;
+            bzero(arg, arg_len);
+        }
+    }
+#endif
+
     content->type = ctype;
     content->flags = (is_private ? OS_LOG_CONTENT_FLAG_PRIVATE : 0);