Add dump-vvar

2 files changed, 17 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 128d464..155f9cd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 .PHONY: all
-all: timing_test evil-clock-test test_vsyscall dump-vdso dump-vsyscall context_switch_latency
+all: timing_test evil-clock-test test_vsyscall dump-vdso dump-vvar dump-vsyscall context_switch_latency
 
 timing_test: timing_test.cc
 	g++ -o $@ -O2 -Wall -g $^ -lrt -ldl
@@ -13,6 +13,9 @@ test_vsyscall: test_vsyscall.cc
 dump-vdso: dump-vdso.c
 	gcc -o $@ -O2 $^ -ldl
 
+dump-vvar: dump-vvar.c
+	gcc -o $@ -O2 $^
+
 dump-vsyscall: dump-vsyscall.c
 	gcc -o $@ -O2 $^ -ldl
 
diff --git a/dump-vvar.c b/dump-vvar.c
new file mode 100644
index 0000000..14f0d39
--- /dev/null
+++ b/dump-vvar.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+	char page[4096];
+	fprintf(stderr, "Do not rely on this program to work across "
+		"kernel versions\n");
+	memcpy(page, (const void *)(0xffffffffff5ff000), 4096);
+	write(1, page, 4096);
+
+	return 0;
+}