hush: fix read builtin to not read ahead past eol and to not use

insane amounts of stack. Testsuite updated.

5 files changed, 16 insertions, 15 deletions

diff --git a/shell/README b/shell/README
index a09353d..b86f96c 100644
--- a/shell/README
+++ b/shell/README
@@ -1,5 +1,8 @@
 Various bits of what is known about busybox shells, in no particular order.
 
+2007-06-13
+hush: exec <"$1" doesn't do parameter subst
+
 2007-05-24
 hush: environment-related memory leak plugged, with net code size
 decrease.
diff --git a/shell/ash.c b/shell/ash.c
index ae078e6..173beb1 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -11567,8 +11567,8 @@ readcmd(int argc, char **argv)
 #endif
 #if ENABLE_ASH_READ_TIMEOUT
 	if (ts.tv_sec || ts.tv_usec) {
-		FD_ZERO (&set);
-		FD_SET (0, &set);
+		FD_ZERO(&set);
+		FD_SET(0, &set);
 
 		i = select(FD_SETSIZE, &set, NULL, NULL, &ts);
 		if (!i) {
diff --git a/shell/hush.c b/shell/hush.c
index 40bcafd..e6fa3d9 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -942,21 +942,11 @@ static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
 /* built-in 'read VAR' handler */
 static int builtin_read(char **argv)
 {
-	char string[BUFSIZ];
-	char *p;
+	char *string;
 	const char *name = argv[1] ? argv[1] : "REPLY";
-	int name_len = strlen(name);
 
-	if (name_len >= sizeof(string) - 2)
-		return EXIT_FAILURE;
-	strcpy(string, name);
-	p = string + name_len;
-	*p++ = '=';
-	*p = '\0'; /* In case stdin has only EOF */
-	/* read string. name_len+1 chars are already used by 'name=' */
-	fgets(p, sizeof(string) - 1 - name_len, stdin);
-	chomp(p);
-	return set_local_var(xstrdup(string), 0);
+	string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name));
+	return set_local_var(string, 0);
 }
 
 /* built-in 'set [VAR=value]' handler */
diff --git a/shell/hush_test/hush-misc/read.right b/shell/hush_test/hush-misc/read.right
new file mode 100644
index 0000000..0e50e2a
--- /dev/null
+++ b/shell/hush_test/hush-misc/read.right
@@ -0,0 +1,4 @@
+read
+cat
+echo "REPLY=$REPLY"
+REPLY=exec <read.tests
diff --git a/shell/hush_test/hush-misc/read.tests b/shell/hush_test/hush-misc/read.tests
new file mode 100755
index 0000000..ff1acbd
--- /dev/null
+++ b/shell/hush_test/hush-misc/read.tests
@@ -0,0 +1,4 @@
+exec <read.tests
+read
+cat
+echo "REPLY=$REPLY"