diff options
| -rw-r--r-- | shell/ash.c | 49 |
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 |