x86/KASLR: Rename "random" to "random_addr"

The variable "random" is also the name of a libc function. It's better
coding style to avoid overloading such things, so rename it to the more
accurate "random_addr".

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: H.J. Lu <hjl.tools@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1460997735-24785-7-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/boot/compressed/kaslr.c

@@ -312,7 +312,7 @@ unsigned char *choose_random_location(unsigned char *input,
 				      unsigned long output_size)
 {
 	unsigned long choice = (unsigned long)output;
-	unsigned long random;
+	unsigned long random_addr;
 
 #ifdef CONFIG_HIBERNATION
 	if (!cmdline_find_option_bool("kaslr")) {
@@ -333,17 +333,17 @@ unsigned char *choose_random_location(unsigned char *input,
 		       (unsigned long)output, output_size);
 
 	/* Walk e820 and find a random address. */
-	random = find_random_addr(choice, output_size);
-	if (!random) {
+	random_addr = find_random_addr(choice, output_size);
+	if (!random_addr) {
 		debug_putstr("KASLR could not find suitable E820 region...\n");
 		goto out;
 	}
 
 	/* Always enforce the minimum. */
-	if (random < choice)
+	if (random_addr < choice)
 		goto out;
 
-	choice = random;
+	choice = random_addr;
 out:
 	return (unsigned char *)choice;
 }