user/elfload: fix argv corruption when it's passed from the stack

1 files changed, 13 insertions, 0 deletions

diff --git a/src/user/app/testelf/main.c b/src/user/app/testelf/main.c
index ee7465b..ea97b4a 100644
--- a/src/user/app/testelf/main.c
+++ b/src/user/app/testelf/main.c
@@ -1,4 +1,6 @@
 #include <stdio.h>
+#include <string.h>
+#include <unistd.h>
 
 const char *str = "Hello!", *str2 = "World.";
 
@@ -8,5 +10,16 @@ int main(int argc, char **argv) {
 	printf("argc == %u\n", argc);
 	for (int i = 0; i < argc; i++)
 		printf("argv[%u] == 0x%x == \"%s\"\n", i, argv[i], argv[i]);
+	if (strcmp(argv[1], "stackexec") == 0) {
+		/* exec something with arguments on the stack */
+		const char s_d[] = "I am a pretty long string on the stack. Oh my. " \
+			"I hope I won't get corrupted.\0";
+		char s[sizeof(s_d)];
+		memcpy(s, s_d, sizeof(s_d));
+		const char *argv2[] = {argv[0], s, s, "hello", s, s, s, "lol", NULL};
+		printf("argv2 == 0x%x, s == 0x%x\n== exec ==\n", argv2, s);
+		execv(argv[0], (void*)argv2);
+		puts("stackexec failed");
+	}
 	return 0;
 }