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-rw-r--r--shell/ash.c49
1 files changed, 33 insertions, 16 deletions
diff --git a/shell/ash.c b/shell/ash.c
index dcf7705..6d96bce 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -1381,15 +1381,7 @@ static const struct builtincmd builtincmd[] = {
{ BUILTIN_REGULAR "wait", waitcmd },
};
-#define NUMBUILTINS (sizeof (builtincmd) / sizeof (struct builtincmd) )
-
-static const char *safe_applets[] = {
- "[", "test", "echo", "cat",
- "ln", "cp", "touch", "mkdir", "rm",
- "cut", "hexdump", "awk", "sort",
- "find", "xargs", "ls", "dd",
- "chown", "chmod"
-};
+#define NUMBUILTINS (sizeof(builtincmd) / sizeof(builtincmd[0]))
struct cmdentry {
@@ -2042,7 +2034,30 @@ static void exitshell(void) ATTRIBUTE_NORETURN;
static int is_safe_applet(char *name)
{
- int n = sizeof(safe_applets) / sizeof(char *);
+ /* It isn't a bug to have non-existent applet here... */
+ /* ...just a waste of space... */
+ static const char safe_applets[][8] = {
+ "["
+ USE_AWK (, "awk" )
+ USE_CAT (, "cat" )
+ USE_CHMOD (, "chmod" )
+ USE_CHOWN (, "chown" )
+ USE_CP (, "cp" )
+ USE_CUT (, "cut" )
+ USE_DD (, "dd" )
+ USE_ECHO (, "echo" )
+ USE_FIND (, "find" )
+ USE_HEXDUMP(, "hexdump")
+ USE_LN (, "ln" )
+ USE_LS (, "ls" )
+ USE_MKDIR (, "mkdir" )
+ USE_RM (, "rm" )
+ USE_SORT (, "sort" )
+ USE_TEST (, "test" )
+ USE_TOUCH (, "touch" )
+ USE_XARGS (, "xargs" )
+ };
+ int n = sizeof(safe_applets) / sizeof(safe_applets[0]);
int i;
for (i = 0; i < n; i++)
if (strcmp(safe_applets[i], name) == 0)
@@ -3702,12 +3717,11 @@ shellexec(char **argv, const char *path, int idx)
clearredir(1);
envp = environment();
- if (strchr(argv[0], '/') != NULL
- || is_safe_applet(argv[0])
+ if (strchr(argv[0], '/')
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
- || find_applet_by_name(argv[0])
+ || find_applet_by_name(argv[0])
#endif
- ) {
+ ) {
tryexec(argv[0], argv, envp);
e = errno;
} else {
@@ -3750,7 +3764,10 @@ tryexec(char *cmd, char **argv, char **envp)
int argc = 0;
char **c;
- if(strchr(cmd, '/') == NULL && is_safe_applet(cmd) && (a = find_applet_by_name(cmd)) != NULL) {
+ if (strchr(cmd, '/') == NULL
+ && (a = find_applet_by_name(cmd)) != NULL
+ && is_safe_applet(cmd)
+ ) {
c = argv;
while (*c != NULL) {
c++; argc++;
@@ -3759,7 +3776,7 @@ tryexec(char *cmd, char **argv, char **envp)
exit(a->main(argc, argv));
}
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
- if(find_applet_by_name(cmd) != NULL) {
+ if (find_applet_by_name(cmd) != NULL) {
/* re-exec ourselves with the new arguments */
execve(CONFIG_BUSYBOX_EXEC_PATH,argv,envp);
/* If they called chroot or otherwise made the binary no longer