Merge pull request #366 from yungen-lu/lab5

YingMuo · web-flow · commit 20b2af553456 · 2025-05-08T16:15:48.000+08:00
[LAB5] 313551077
diff --git a/lab5/antiasan.c b/lab5/antiasan.c
@@ -2,5 +2,11 @@
 
 void antiasan(unsigned long addr)
 {
-
+    // Calculate shadow memory address for gS (after gBadBuf)
+    unsigned long shadow_addr = ((addr + 0x87) >> 3) + 0x7fff8000;
+    
+    // Mark 16 bytes of shadow memory as valid (covers gS[0x17] to gS[0x27])
+    for (int i = 0; i < 16; i++) {
+        *(char *)(shadow_addr + i) = 0;
+    }
 }

Original file line number	Diff line number	Diff line change
`@@ -2,5 +2,11 @@`
`2`	`2`
`3`	`3`	`void antiasan(unsigned long addr)`
`4`	`4`	`{`
`5`		`-`
	`5`	`+ // Calculate shadow memory address for gS (after gBadBuf)`
	`6`	`+ unsigned long shadow_addr = ((addr + 0x87) >> 3) + 0x7fff8000;`
	`7`	`+`
	`8`	`+ // Mark 16 bytes of shadow memory as valid (covers gS[0x17] to gS[0x27])`
	`9`	`+ for (int i = 0; i < 16; i++) {`
	`10`	`+ (char )(shadow_addr + i) = 0;`
	`11`	`+ }`
`6`	`12`	`}`