[7/8] maccess: rename strncpy_from_unsafe_strict to, strncpy_from_kernel_nofault

diff --git a/arch/x86/mm/maccess.c b/arch/x86/mm/maccess.c
index f5b85bdc0535..62c4017a2473 100644
--- a/arch/x86/mm/maccess.c
+++ b/arch/x86/mm/maccess.c
@@ -34,7 +34,7 @@  long probe_kernel_read_strict(void *dst, const void *src, size_t size)
     return __probe_kernel_read(dst, src, size);
 }
 
-long strncpy_from_unsafe_strict(char *dst, const void *unsafe_addr, long count)
+long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
 {
     if (unlikely(invalid_probe_range((unsigned long)unsafe_addr)))
         return -EFAULT;
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 23e655549be2..7c61d3ddae57 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -351,8 +351,8 @@  extern long notrace probe_user_write(void __user *dst, const void *src, size_t s
 extern long notrace __probe_user_write(void __user *dst, const void *src, size_t size);
 
 extern long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count);
-extern long strncpy_from_unsafe_strict(char *dst, const void *unsafe_addr,
-                       long count);
+long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr,
+        long count);
 extern long __strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count);
 long strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
         long count);
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 720d78c62d05..7b905aa800b2 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -242,7 +242,7 @@  bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr,
      * is returned that can be used for bpf_perf_event_output() et al.
      */
     ret = compat ? strncpy_from_unsafe(dst, unsafe_ptr, size) :
-          strncpy_from_unsafe_strict(dst, unsafe_ptr, size);
+          strncpy_from_kernel_nofault(dst, unsafe_ptr, size);
     if (unlikely(ret < 0))
 out:
         memset(dst, 0, size);
@@ -414,7 +414,7 @@  BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1,
                 break;
 #endif
             case 'k':
-                strncpy_from_unsafe_strict(buf, unsafe_ptr,
+                strncpy_from_kernel_nofault(buf, unsafe_ptr,
                                sizeof(buf));
                 break;
             case 'u':
diff --git a/mm/maccess.c b/mm/maccess.c
index 84c598673aa9..82863bc6b550 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -167,17 +167,36 @@  EXPORT_SYMBOL_GPL(probe_user_write);
  * If @count is smaller than the length of the string, copies @count-1 bytes,
  * sets the last byte of @dst buffer to NUL and returns @count.
  *
- * strncpy_from_unsafe_strict() is the same as strncpy_from_unsafe() except
- * for the case where architectures have non-overlapping user and kernel address
- * ranges: strncpy_from_unsafe_strict() will additionally return -EFAULT for
- * probing memory on a user address range where strncpy_from_unsafe_user() is
- * supposed to be used instead.
+ * Same as strncpy_from_kernel_nofault() except that for architectures with
+ * not fully separated user and kernel address spaces this function also works
+ * for user address tanges.
+ *
+ * DO NOT USE THIS FUNCTION - it is broken on architectures with entirely
+ * separate kernel and user address spaces, and also a bad idea otherwise.
  */
 
 long __weak strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)
     __attribute__((alias("__strncpy_from_unsafe")));
 
-long __weak strncpy_from_unsafe_strict(char *dst, const void *unsafe_addr,
+/**
+ * strncpy_from_kernel_nofault: - Copy a NUL terminated string from unsafe
+ *                 address.
+ * @dst:   Destination address, in kernel space.  This buffer must be at
+ *         least @count bytes long.
+ * @unsafe_addr: Unsafe address.
+ * @count: Maximum number of bytes to copy, including the trailing NUL.
+ *
+ * Copies a NUL-terminated string from unsafe address to kernel buffer.
+ *
+ * On success, returns the length of the string INCLUDING the trailing NUL.
+ *
+ * If access fails, returns -EFAULT (some data may have been copied
+ * and the trailing NUL added).
+ *
+ * If @count is smaller than the length of the string, copies @count-1 bytes,
+ * sets the last byte of @dst buffer to NUL and returns @count.
+ */
+long __weak strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr,
                        long count)
     __attribute__((alias("__strncpy_from_unsafe")));