commit 154140a22b1c697f6a3edb3e5913efded1be082a
from: Russ Cox <rsc@swtch.com>
date: Mon May 18 00:15:41 2020 UTC

mk: replace overlapping strcpy with memmove

Found by ASAN.

commit - 8cb7308f3a24249ed091c7decf22005c64099783
commit + 154140a22b1c697f6a3edb3e5913efded1be082a
blob - d7c6481d7bb4b7a817e17c5255af89e3f1530d1b
blob + e01aa21ae991364f6560a86e282a6197685849e2
--- src/cmd/mk/env.c
+++ src/cmd/mk/env.c
@@ -123,7 +123,8 @@ buildenv(Job *j, int slot)
 			qp = strchr(cp+1, ')');
 			if(qp){
 				*qp = 0;
-				strcpy(w->s, cp+1);
+				/* strcpy, but might overlap */
+				memmove(w->s, cp+1, strlen(cp+1)+1);
 				l = &w->next;
 				w = w->next;
 				continue;