gistfile1.txt

garrett@hipster{25}> git diff uts/common/os/exec.c | cat
diff --git a/usr/src/uts/common/os/exec.c b/usr/src/uts/common/os/exec.c
index f222a20..611a6f3 100644
--- a/usr/src/uts/common/os/exec.c
+++ b/usr/src/uts/common/os/exec.c
@@ -100,6 +100,7 @@ uint_t auxv_hwcap32_2 = 0;	/* 32-bit version of auxv_hwcap2 */
 #define	PSUIDFLAGS		(SNOCD|SUGID)
 
 #define	DEVFD			"/dev/fd/"
+#define	DEVFD_STRLEN		(sizeof (DEVFD) - 1)
 
 /*
  * exece() - system call wrapper around exec_common()
@@ -202,11 +203,12 @@ exec_common(const char *fname, const char **argp, const char **envp,
 		goto out;
 	pn_alloc(&resolvepn);
 
-	if (strncmp(pn.pn_path, DEVFD, strlen(DEVFD)) == 0) {
+	if ((strncmp(pn.pn_path, DEVFD, DEVFD_STRLEN) == 0) &&
+	    (pn.pn_path[DEVFD_STRLEN] != '\0')) {
 		/* looks like a /dev/fd node */
-		char *p = pn.pn_path + strlen(DEVFD);
+		char *p = pn.pn_path + DEVFD_STRLEN;
 		int fd = stoi(&p);
-		if ((fd < 0) || (*p != 0) || (p == pn.pn_path)) {
+		if ((fd < 0) || (*p != '\0')) {
 			error = EBADF;
 			goto out;
 		}