From: Matt Mullins <mmullins@mmlx.us>
Date: Sat, 21 Sep 2013 17:24:01 +0000 (+0000)
Subject: Read random memory until something is nonzero.
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=02d3d6bed0414e85abecfd31220b0eaf5ea55aa5;p=mmap_everything.git

Read random memory until something is nonzero.
---

diff --git a/mmap_everything.c b/mmap_everything.c
index a1b4b77..ae1d529 100644
--- a/mmap_everything.c
+++ b/mmap_everything.c
@@ -45,9 +45,8 @@ int main() {
 	}
 
 	srand48(time(NULL));
-	while (1) {
-		printf("Press enter to read a random byte of memory. (pid %d) >", pid);
-		while (getchar() != '\n');
+	int *pi;
+	do {
 		uint32_t lower = lrand48();
 		uint32_t upper = lrand48();
 
@@ -55,8 +54,8 @@ int main() {
 		// align to integer, keep in "userspace" address space
 		pvalue &= 0x00007FFFFFFFFFF0;
 
-		int *pi = (void*)(pvalue);
+		pi = (void*)(pvalue);
 		printf("*%p = ", (void*)pi);
 		printf("%x\n", *pi);
-	}
+	} while (*pi == 0);
 }