audit small applets and mark some of them as NOFORK.

Put big scary warnings in relevant places.

coreutils/basename.c

@@ -20,11 +20,10 @@
  * 3) Save some space by using strcmp().  Calling strncmp() here was silly.
  */
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int basename_main(int argc, char **argv);
 int basename_main(int argc, char **argv)
 {
@@ -47,5 +46,5 @@ int basename_main(int argc, char **argv)
 
 	puts(s);
 
-	fflush_stdout_and_exit(EXIT_SUCCESS);
+	return fflush(stdout);
 }

coreutils/cat.c

@@ -12,17 +12,23 @@
 
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
+
 int bb_cat(char **argv)
 {
 	static const char *const argv_dash[] = { "-", NULL };
+
 	FILE *f;
 	int retval = EXIT_SUCCESS;
 
-	if (!*argv) argv = (char**) &argv_dash;
+	if (!*argv)
+		argv = (char**) &argv_dash;
 
 	do {
 		f = fopen_or_warn_stdin(*argv);
 		if (f) {
+			/* This is not an xfunc - never exits */
 			off_t r = bb_copyfd_eof(fileno(f), STDOUT_FILENO);
 			fclose_if_not_stdin(f);
 			if (r >= 0)

coreutils/chgrp.c

@@ -13,6 +13,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 int chgrp_main(int argc, char **argv);
 int chgrp_main(int argc, char **argv)
 {

coreutils/chmod.c

@@ -16,6 +16,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 #define OPT_RECURSE (option_mask32 & 1)
 #define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
 #define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))

coreutils/chown.c

@@ -13,6 +13,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 #define OPT_STR     ("Rh" USE_DESKTOP("vcfLHP"))
 #define BIT_RECURSE 1
 #define OPT_RECURSE (option_mask32 & 1)

coreutils/chroot.c

@@ -27,8 +27,9 @@ int chroot_main(int argc, char **argv)
 	++argv;
 	if (argc == 2) {
 		argv -= 2;
-		if (!(*argv = getenv("SHELL"))) {
-			*argv = (char *) DEFAULT_SHELL;
+		argv[0] = getenv("SHELL");
+		if (!argv[0]) {
+			argv[0] = (char *) DEFAULT_SHELL;
 		}
 		argv[1] = (char *) "-i";
 	}

coreutils/cp.c

@@ -18,6 +18,9 @@
 #include "busybox.h"
 #include "libcoreutils/coreutils.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 int cp_main(int argc, char **argv);
 int cp_main(int argc, char **argv)
 {

coreutils/cut.c

@@ -11,6 +11,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 /* option vars */
 static const char optstring[] = "b:c:f:d:sn";
 #define CUT_OPT_BYTE_FLGS	(1<<0)

coreutils/dd.c

@@ -8,8 +8,11 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include "busybox.h"
 #include <signal.h>  /* For FEATURE_DD_SIGNAL_HANDLING */
+#include "busybox.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
 
 static const struct suffix_mult dd_suffixes[] = {
 	{ "c", 1 },

coreutils/dirname.c

@@ -10,10 +10,10 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/dirname.html */
 
-#include <stdio.h>
-#include <stdlib.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int dirname_main(int argc, char **argv);
 int dirname_main(int argc, char **argv)
 {
@@ -23,5 +23,5 @@ int dirname_main(int argc, char **argv)
 
 	puts(dirname(argv[1]));
 
-	fflush_stdout_and_exit(EXIT_SUCCESS);
+	return fflush(stdout);
 }

coreutils/false.c

@@ -10,9 +10,10 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/false.html */
 
-#include <stdlib.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int false_main(int ATTRIBUTE_UNUSED argc, char ATTRIBUTE_UNUSED **argv);
 int false_main(int ATTRIBUTE_UNUSED argc, char ATTRIBUTE_UNUSED **argv)
 {

coreutils/hostid.c

@@ -9,10 +9,10 @@
 
 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
 
-#include <stdlib.h>
-#include <unistd.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int hostid_main(int argc, char ATTRIBUTE_UNUSED **argv);
 int hostid_main(int argc, char ATTRIBUTE_UNUSED **argv)
 {
@@ -22,5 +22,5 @@ int hostid_main(int argc, char ATTRIBUTE_UNUSED **argv)
 
 	printf("%lx\n", gethostid());
 
-	fflush_stdout_and_exit(EXIT_SUCCESS);
+	return fflush(stdout);
 }

coreutils/length.c

@@ -2,19 +2,18 @@
 
 /* BB_AUDIT SUSv3 N/A -- Apparently a busybox (obsolete?) extension. */
 
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int length_main(int argc, char **argv);
 int length_main(int argc, char **argv)
 {
-	if ((argc != 2) ||  (**(++argv) == '-')) {
-	    bb_show_usage();
+	if ((argc != 2) || (**(++argv) == '-')) {
+		bb_show_usage();
 	}
 
-	printf("%lu\n", (unsigned long)strlen(*argv));
+	printf("%u\n", (unsigned)strlen(*argv));
 
-	fflush_stdout_and_exit(EXIT_SUCCESS);
+	return fflush(stdout);
 }

coreutils/ln.c

@@ -13,6 +13,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 #define LN_SYMLINK          1
 #define LN_FORCE            2
 #define LN_NODEREFERENCE    4

coreutils/logname.c

@@ -20,23 +20,23 @@
  * a diagnostic message and an error return.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int logname_main(int argc, char ATTRIBUTE_UNUSED **argv);
 int logname_main(int argc, char ATTRIBUTE_UNUSED **argv)
 {
-	const char *p;
+	char buf[128];
 
 	if (argc > 1) {
 		bb_show_usage();
 	}
 
-	if ((p = getlogin()) != NULL) {
-		puts(p);
-		fflush_stdout_and_exit(EXIT_SUCCESS);
+	/* Using _r function - avoid pulling in static buffer from libc */
+	if (getlogin_r(buf, sizeof(buf)) == 0) {
+		puts(buf);
+		return fflush(stdout);
 	}
 
 	bb_perror_msg_and_die("getlogin");

coreutils/ls.c

@@ -29,8 +29,11 @@
  * 1. requires lstat (BSD) - how do you do it without?
  */
 
-#include "busybox.h"
 #include <getopt.h>
+#include "busybox.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
 
 enum {
 

coreutils/mkdir.c

@@ -19,19 +19,19 @@
 /* Nov 28, 2006      Yoshinori Sato <ysato@users.sourceforge.jp>: Add SELinux Support.
  */
 
-#include <stdlib.h>
-#include <unistd.h>
 #include <getopt.h> /* struct option */
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 #if ENABLE_FEATURE_MKDIR_LONG_OPTIONS
 static const struct option mkdir_long_options[] = {
-	{ "mode", 1, NULL, 'm' },
+	{ "mode"   , 1, NULL, 'm' },
 	{ "parents", 0, NULL, 'p' },
 #if ENABLE_SELINUX
 	{ "context", 1, NULL, 'Z' },
 #endif
-	{ 0, 0, 0, 0 }
+	{ NULL, 0, NULL, 0 }
 };
 #endif
 

coreutils/mkfifo.c

@@ -10,9 +10,6 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/mkfifo.html */
 
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/types.h>
 #include "busybox.h"
 #include "libcoreutils/coreutils.h"
 
@@ -24,7 +21,8 @@ int mkfifo_main(int argc, char **argv)
 
 	mode = getopt_mk_fifo_nod(argc, argv);
 
-	if (!*(argv += optind)) {
+	argv += optind;
+	if (!*argv) {
 		bb_show_usage();
 	}
 

coreutils/pwd.c

@@ -7,10 +7,10 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int pwd_main(int argc, char **argv);
 int pwd_main(int argc, char **argv)
 {
@@ -19,7 +19,8 @@ int pwd_main(int argc, char **argv)
 	buf = xrealloc_getcwd_or_warn(NULL);
 	if (buf != NULL) {
 		puts(buf);
-		fflush_stdout_and_exit(EXIT_SUCCESS);
+		free(buf);
+		return fflush(stdout);
 	}
 
 	return EXIT_FAILURE;

coreutils/rm.c

@@ -15,9 +15,10 @@
  * Size reduction.
  */
 
-#include <unistd.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int rm_main(int argc, char **argv);
 int rm_main(int argc, char **argv)
 {
@@ -27,14 +28,15 @@ int rm_main(int argc, char **argv)
 
 	opt_complementary = "f-i:i-f";
 	opt = getopt32(argc, argv, "fiRr");
+	argv += optind;
 	if(opt & 1)
-				flags |= FILEUTILS_FORCE;
+		flags |= FILEUTILS_FORCE;
 	if(opt & 2)
 		flags |= FILEUTILS_INTERACTIVE;
 	if(opt & 12)
 		flags |= FILEUTILS_RECUR;
 
-	if (*(argv += optind) != NULL) {
+	if (*argv != NULL) {
 		do {
 			const char *base = bb_get_last_path_component(*argv);
 

coreutils/rmdir.c

@@ -10,11 +10,12 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/rmdir.html */
 
-#include <stdlib.h>
-#include <unistd.h>
 #include <libgen.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
+
 int rmdir_main(int argc, char **argv);
 int rmdir_main(int argc, char **argv)
 {
@@ -24,7 +25,6 @@ int rmdir_main(int argc, char **argv)
 	char *path;
 
 	flags = getopt32(argc, argv, "p");
-
 	argv += optind;
 
 	if (!*argv) {
@@ -37,7 +37,7 @@ int rmdir_main(int argc, char **argv)
 		/* Record if the first char was a '.' so we can use dirname later. */
 		do_dot = (*path == '.');
 
-		do {
+		while (1) {
 			if (rmdir(path) < 0) {
 				bb_perror_msg("'%s'", path);	/* Match gnu rmdir msg. */
 				status = EXIT_FAILURE;
@@ -53,7 +53,7 @@ int rmdir_main(int argc, char **argv)
 				}
 			}
 			break;
-		} while (1);
+		}
 
 	} while (*++argv);
 

coreutils/seq.c

@@ -7,21 +7,22 @@
  * Licensed under the GPL v2, see the file LICENSE in this tarball.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
+
 int seq_main(int argc, char **argv);
 int seq_main(int argc, char **argv)
 {
-	double last, first, increment, i;
+	double last, increment, i;
 
-	first = increment = 1;
+	i = increment = 1;
 	switch (argc) {
 		case 4:
 			increment = atof(argv[2]);
 		case 3:
-			first = atof(argv[1]);
+			i = atof(argv[1]);
 		case 2:
 			last = atof(argv[argc-1]);
 			break;
@@ -30,12 +31,10 @@ int seq_main(int argc, char **argv)
 	}
 
 	/* You should note that this is pos-5.0.91 semantics, -- FK. */
-	for (i = first;
-		(increment > 0 && i <= last) || (increment < 0 && i >=last);
-		i += increment)
-	{
+	while ((increment > 0 && i <= last) || (increment < 0 && i >= last)) {
 		printf("%g\n", i);
+		i += increment;
 	}
 
-	return EXIT_SUCCESS;
+	return fflush(stdout);
 }

coreutils/sleep.c

@@ -18,12 +18,12 @@
  * time suffixes for seconds, minutes, hours, and days.
  */
 
-#include <stdlib.h>
-#include <limits.h>
-#include <unistd.h>
 #include "busybox.h"
 
-#ifdef CONFIG_FEATURE_FANCY_SLEEP
+/* This is a NOFORK applet. Be very careful! */
+
+
+#if ENABLE_FEATURE_FANCY_SLEEP
 static const struct suffix_mult sfx[] = {
 	{ "s", 1 },
 	{ "m", 60 },
@@ -36,9 +36,9 @@ static const struct suffix_mult sfx[] = {
 int sleep_main(int argc, char **argv);
 int sleep_main(int argc, char **argv)
 {
-	unsigned int duration;
+	unsigned duration;
 
-#ifdef CONFIG_FEATURE_FANCY_SLEEP
+#if ENABLE_FEATURE_FANCY_SLEEP
 
 	if (argc < 2) {
 		bb_show_usage();
@@ -50,7 +50,7 @@ int sleep_main(int argc, char **argv)
 		duration += xatoul_range_sfx(*argv, 0, UINT_MAX-duration, sfx);
 	} while (*++argv);
 
-#else  /* CONFIG_FEATURE_FANCY_SLEEP */
+#else  /* FEATURE_FANCY_SLEEP */
 
 	if (argc != 2) {
 		bb_show_usage();
@@ -58,7 +58,7 @@ int sleep_main(int argc, char **argv)
 
 	duration = xatou(argv[1]);
 
-#endif /* CONFIG_FEATURE_FANCY_SLEEP */
+#endif /* FEATURE_FANCY_SLEEP */
 
 	if (sleep(duration)) {
 		bb_perror_nomsg_and_die();

coreutils/sort.c

@@ -14,6 +14,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 /*
 	sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
 	sort -c [-bdfinru][-t char][-k keydef][file]

coreutils/sync.c

@@ -9,10 +9,10 @@
 
 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
 
-#include <stdlib.h>
-#include <unistd.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int sync_main(int argc, char **argv);
 int sync_main(int argc, char **argv)
 {

coreutils/test.c

@@ -21,12 +21,11 @@
  */
 
 #include "busybox.h"
-#include <unistd.h>
-#include <ctype.h>
-#include <errno.h>
-#include <string.h>
 #include <setjmp.h>
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 /* test(1) accepts the following grammar:
 	oexpr	::= aexpr | aexpr "-o" oexpr ;
 	aexpr	::= nexpr | nexpr "-a" aexpr ;

coreutils/true.c

@@ -10,9 +10,10 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/true.html */
 
-#include <stdlib.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int true_main(int argc, char **argv);
 int true_main(int argc, char **argv)
 {

coreutils/tty.c

@@ -10,9 +10,6 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
 #include "busybox.h"
 
 int tty_main(int argc, char **argv);
@@ -31,7 +28,8 @@ int tty_main(int argc, char **argv)
 
 	retval = 0;
 
-	if ((s = ttyname(0)) == NULL) {
+	s = ttyname(0);
+	if (s == NULL) {
 	/* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
 	 * We know the file descriptor is good, so failure means not a tty. */
 		s = "not a tty";

coreutils/usleep.c

@@ -9,11 +9,10 @@
 
 /* BB_AUDIT SUSv3 N/A -- Apparently a busybox extension. */
 
-#include <stdlib.h>
-#include <limits.h>
-#include <unistd.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int usleep_main(int argc, char **argv);
 int usleep_main(int argc, char **argv)
 {

coreutils/whoami.c

@@ -9,11 +9,10 @@
 
 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int whoami_main(int argc, char **argv);
 int whoami_main(int argc, char **argv)
 {
@@ -21,6 +20,6 @@ int whoami_main(int argc, char **argv)
 		bb_show_usage();
 
 	puts(bb_getpwuid(NULL, geteuid(), -1));
-	/* exits on error */
-	fflush_stdout_and_exit(EXIT_SUCCESS);
+
+	return fflush(stdout);
 }

coreutils/yes.c

@@ -16,25 +16,26 @@
 
 #include "busybox.h"
 
+/* This is a NOFORK applet. Be very careful! */
+
 int yes_main(int argc, char **argv);
 int yes_main(int argc, char **argv)
 {
-	static const char fmt_str[] = " %s";
-	const char *fmt;
 	char **first_arg;
 
-	*argv = (char*)"y";
+	argv[0] = (char*)"y";
 	if (argc != 1) {
 		++argv;
 	}
 
 	first_arg = argv;
 	do {
-		fmt = fmt_str + 1;
-		do {
-			printf(fmt, *argv);
-			fmt = fmt_str;
-		} while (*++argv);
+		while (1) {
+			fputs(*argv, stdout);
+			if (!*++argv)
+				break;
+			putchar(' ');
+		}
 		argv = first_arg;
 	} while (putchar('\n') != EOF);
 

editors/awk.c

@@ -11,6 +11,8 @@
 #include "xregex.h"
 #include <math.h>
 
+/* This is a NOEXEC applet. Be very careful! */
+
 
 #define	MAXVARFMT       240
 #define	MINNVBLOCK      64

findutils/find.c

@@ -48,6 +48,9 @@
 #include <fnmatch.h>
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 USE_FEATURE_FIND_XDEV(static dev_t *xdev_dev;)
 USE_FEATURE_FIND_XDEV(static int xdev_count;)
 

findutils/xargs.c

@@ -19,6 +19,9 @@
 
 #include "busybox.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 /* COMPAT:  SYSV version defaults size (and has a max value of) to 470.
    We try to make it as large as possible. */
 #if !defined(ARG_MAX) && defined(_SC_ARG_MAX)

include/applets.h

@@ -76,17 +76,17 @@ USE_ARP(APPLET(arp, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_ARPING(APPLET(arping, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_ASH(APPLET_NOUSAGE(ash, ash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_AWK(APPLET_NOEXEC(awk, awk, _BB_DIR_USR_BIN, _BB_SUID_NEVER, awk))
-USE_BASENAME(APPLET(basename, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_BASENAME(APPLET_NOFORK(basename, basename, _BB_DIR_USR_BIN, _BB_SUID_NEVER, basename))
 USE_BBCONFIG(APPLET(bbconfig, _BB_DIR_BIN, _BB_SUID_NEVER))
 //USE_BBSH(APPLET(bbsh, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_NEVER, bzcat))
 USE_CAL(APPLET(cal, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_CAT(APPLET_NOEXEC(cat, cat, _BB_DIR_BIN, _BB_SUID_NEVER, cat))
+USE_CAT(APPLET_NOFORK(cat, cat, _BB_DIR_BIN, _BB_SUID_NEVER, cat))
 USE_CATV(APPLET(catv, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHATTR(APPLET(chattr, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHCON(APPLET(chcon, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_CHGRP(APPLET(chgrp, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_CHGRP(APPLET_NOEXEC(chgrp, chgrp, _BB_DIR_BIN, _BB_SUID_NEVER, chgrp))
 USE_CHMOD(APPLET_NOEXEC(chmod, chmod, _BB_DIR_BIN, _BB_SUID_NEVER, chmod))
 USE_CHOWN(APPLET_NOEXEC(chown, chown, _BB_DIR_BIN, _BB_SUID_NEVER, chown))
 USE_CHPST(APPLET(chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -112,7 +112,7 @@ USE_DEVFSD(APPLET(devfsd, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_DF(APPLET(df, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_APP_DHCPRELAY(APPLET(dhcprelay, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_DIFF(APPLET(diff, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_DIRNAME(APPLET(dirname, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_DIRNAME(APPLET_NOFORK(dirname, dirname, _BB_DIR_USR_BIN, _BB_SUID_NEVER, dirname))
 USE_DMESG(APPLET(dmesg, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_DNSD(APPLET(dnsd, _BB_DIR_USR_SBIN, _BB_SUID_ALWAYS))
 USE_DOS2UNIX(APPLET(dos2unix, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -133,7 +133,7 @@ USE_ENVUIDGID(APPLET_ODDNAME(envuidgid, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER,
 USE_ETHER_WAKE(APPLET_ODDNAME(ether-wake, ether_wake, _BB_DIR_USR_BIN, _BB_SUID_NEVER, ether_wake))
 USE_EXPR(APPLET(expr, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FAKEIDENTD(APPLET(fakeidentd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
-USE_FALSE(APPLET(false, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_FALSE(APPLET_NOFORK(false, false, _BB_DIR_BIN, _BB_SUID_NEVER, false))
 USE_FBSET(APPLET(fbset, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_FDFLUSH(APPLET_ODDNAME(fdflush, freeramdisk, _BB_DIR_BIN, _BB_SUID_NEVER, fdflush))
 USE_FDFORMAT(APPLET(fdformat, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -162,7 +162,7 @@ USE_HALT(APPLET(halt, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_HDPARM(APPLET(hdparm, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_HEAD(APPLET(head, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_HEXDUMP(APPLET_NOEXEC(hexdump, hexdump, _BB_DIR_USR_BIN, _BB_SUID_NEVER, hexdump))
-USE_HOSTID(APPLET(hostid, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_HOSTID(APPLET_NOFORK(hostid, hostid, _BB_DIR_USR_BIN, _BB_SUID_NEVER, hostid))
 USE_HOSTNAME(APPLET(hostname, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_HTTPD(APPLET(httpd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_HUSH(APPLET_NOUSAGE(hush, hush, _BB_DIR_BIN, _BB_SUID_NEVER))
@@ -190,7 +190,7 @@ USE_KILLALL5(APPLET_ODDNAME(killall5, kill, _BB_DIR_USR_BIN, _BB_SUID_NEVER, kil
 USE_KLOGD(APPLET(klogd, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_LASH(APPLET(lash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_LAST(APPLET(last, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_LENGTH(APPLET(length, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_LENGTH(APPLET_NOFORK(length, length, _BB_DIR_USR_BIN, _BB_SUID_NEVER, length))
 USE_LESS(APPLET(less, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_SETARCH(APPLET_NOUSAGE(linux32, setarch, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SETARCH(APPLET_NOUSAGE(linux64, setarch, _BB_DIR_BIN, _BB_SUID_NEVER))
@@ -201,7 +201,7 @@ USE_LOADFONT(APPLET(loadfont, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_LOADKMAP(APPLET(loadkmap, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_LOGGER(APPLET(logger, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_LOGIN(APPLET(login, _BB_DIR_BIN, _BB_SUID_ALWAYS))
-USE_LOGNAME(APPLET(logname, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_LOGNAME(APPLET_NOFORK(logname, logname, _BB_DIR_USR_BIN, _BB_SUID_NEVER, logname))
 USE_LOGREAD(APPLET(logread, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_LOSETUP(APPLET(losetup, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_LS(APPLET_NOEXEC(ls, ls, _BB_DIR_BIN, _BB_SUID_NEVER, ls))
@@ -213,7 +213,7 @@ USE_MAKEDEVS(APPLET(makedevs, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_MD5SUM(APPLET_ODDNAME(md5sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, md5sum))
 USE_MDEV(APPLET(mdev, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_MESG(APPLET(mesg, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_MKDIR(APPLET_NOEXEC(mkdir, mkdir, _BB_DIR_BIN, _BB_SUID_NEVER, mkdir))
+USE_MKDIR(APPLET_NOFORK(mkdir, mkdir, _BB_DIR_BIN, _BB_SUID_NEVER, mkdir))
 //USE_MKE2FS(APPLET(mke2fs, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_MKFIFO(APPLET(mkfifo, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 //USE_MKE2FS(APPLET_NOUSAGE(mkfs.ext2, mke2fs, _BB_DIR_SBIN, _BB_SUID_NEVER))
@@ -249,7 +249,7 @@ USE_HALT(APPLET_ODDNAME(poweroff, halt, _BB_DIR_SBIN, _BB_SUID_NEVER, poweroff))
 USE_PRINTENV(APPLET(printenv, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_PRINTF(APPLET(printf, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_PS(APPLET(ps, _BB_DIR_BIN, _BB_SUID_NEVER))
-USE_PWD(APPLET(pwd, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_PWD(APPLET_NOFORK(pwd, pwd, _BB_DIR_BIN, _BB_SUID_NEVER, pwd))
 USE_RAIDAUTORUN(APPLET(raidautorun, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_RDATE(APPLET(rdate, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_READAHEAD(APPLET(readahead, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -260,8 +260,8 @@ USE_HALT(APPLET_ODDNAME(reboot, halt, _BB_DIR_SBIN, _BB_SUID_NEVER, reboot))
 USE_RENICE(APPLET(renice, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_RESET(APPLET(reset, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_RESIZE(APPLET(resize, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_RM(APPLET_NOEXEC(rm, rm, _BB_DIR_BIN, _BB_SUID_NEVER, rm))
-USE_RMDIR(APPLET(rmdir, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_RM(APPLET_NOFORK(rm, rm, _BB_DIR_BIN, _BB_SUID_NEVER, rm))
+USE_RMDIR(APPLET_NOFORK(rmdir, rmdir, _BB_DIR_BIN, _BB_SUID_NEVER, rmdir))
 USE_RMMOD(APPLET(rmmod, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_ROUTE(APPLET(route, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_RPM(APPLET(rpm, _BB_DIR_BIN, _BB_SUID_NEVER))
@@ -274,7 +274,7 @@ USE_RUNSVDIR(APPLET(runsvdir, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_RX(APPLET(rx, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_SELINUXENABLED(APPLET(selinuxenabled, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_SED(APPLET(sed, _BB_DIR_BIN, _BB_SUID_NEVER))
-USE_SEQ(APPLET(seq, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_SEQ(APPLET_NOFORK(seq, seq, _BB_DIR_USR_BIN, _BB_SUID_NEVER, seq))
 USE_SETARCH(APPLET(setarch, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SETCONSOLE(APPLET(setconsole, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_SETENFORCE(APPLET(setenforce, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
@@ -287,7 +287,7 @@ USE_FEATURE_SH_IS_HUSH(APPLET_NOUSAGE(sh, hush, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_LASH(APPLET_NOUSAGE(sh, lash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_MSH(APPLET_NOUSAGE(sh, msh, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SHA1SUM(APPLET_ODDNAME(sha1sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sha1sum))
-USE_SLEEP(APPLET(sleep, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_SLEEP(APPLET_NOFORK(sleep, sleep, _BB_DIR_BIN, _BB_SUID_NEVER, sleep))
 USE_SOFTLIMIT(APPLET_ODDNAME(softlimit, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, softlimit))
 USE_SORT(APPLET_NOEXEC(sort, sort, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sort))
 USE_SPLIT(APPLET(split, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -303,7 +303,7 @@ USE_SVLOGD(APPLET(svlogd, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_SWAPONOFF(APPLET_ODDNAME(swapoff, swap_on_off, _BB_DIR_SBIN, _BB_SUID_NEVER,swapoff))
 USE_SWAPONOFF(APPLET_ODDNAME(swapon, swap_on_off, _BB_DIR_SBIN, _BB_SUID_NEVER, swapon))
 USE_SWITCH_ROOT(APPLET(switch_root, _BB_DIR_SBIN, _BB_SUID_NEVER))
-USE_SYNC(APPLET(sync, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_SYNC(APPLET_NOFORK(sync, sync, _BB_DIR_BIN, _BB_SUID_NEVER, sync))
 USE_BB_SYSCTL(APPLET(sysctl, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_SYSLOGD(APPLET(syslogd, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_TAIL(APPLET(tail, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -322,7 +322,7 @@ USE_TOP(APPLET(top, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TOUCH(APPLET_NOFORK(touch, touch, _BB_DIR_BIN, _BB_SUID_NEVER, touch))
 USE_TR(APPLET(tr, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TRACEROUTE(APPLET(traceroute, _BB_DIR_USR_BIN, _BB_SUID_MAYBE))
-USE_TRUE(APPLET(true, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_TRUE(APPLET_NOFORK(true, true, _BB_DIR_BIN, _BB_SUID_NEVER, true))
 USE_TTY(APPLET(tty, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 //USE_TUNE2FS(APPLET(tune2fs, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_APP_UDHCPC(APPLET(udhcpc, _BB_DIR_SBIN, _BB_SUID_NEVER))
@@ -336,7 +336,7 @@ USE_UNIX2DOS(APPLET_ODDNAME(unix2dos, dos2unix, _BB_DIR_USR_BIN, _BB_SUID_NEVER,
 USE_UNLZMA(APPLET(unlzma, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_UNZIP(APPLET(unzip, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_UPTIME(APPLET(uptime, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_USLEEP(APPLET(usleep, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_USLEEP(APPLET_NOFORK(usleep, usleep, _BB_DIR_BIN, _BB_SUID_NEVER, usleep))
 USE_UUDECODE(APPLET(uudecode, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_UUENCODE(APPLET(uuencode, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_VCONFIG(APPLET(vconfig, _BB_DIR_SBIN, _BB_SUID_NEVER))
@@ -348,9 +348,9 @@ USE_WC(APPLET(wc, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_WGET(APPLET(wget, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_WHICH(APPLET(which, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_WHO(APPLET(who, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
-USE_WHOAMI(APPLET(whoami, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_WHOAMI(APPLET_NOFORK(whoami, whoami, _BB_DIR_USR_BIN, _BB_SUID_NEVER, whoami))
 USE_XARGS(APPLET_NOEXEC(xargs, xargs, _BB_DIR_USR_BIN, _BB_SUID_NEVER, xargs))
-USE_YES(APPLET(yes, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_YES(APPLET_NOFORK(yes, yes, _BB_DIR_USR_BIN, _BB_SUID_NEVER, yes))
 USE_GUNZIP(APPLET_ODDNAME(zcat, gunzip, _BB_DIR_BIN, _BB_SUID_NEVER, zcat))
 USE_ZCIP(APPLET(zcip, _BB_DIR_SBIN, _BB_SUID_NEVER))
 

libbb/copyfd.c

@@ -7,19 +7,15 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
 #include "libbb.h"
 
-
 #if BUFSIZ < 4096
 #undef BUFSIZ
 #define BUFSIZ 4096
 #endif
 
+/* Used by NOFORK applets (e.g. cat) - must be very careful
+ * when calling xfuncs, allocating memory, with signals, termios, etc... */
 
 static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
 {
@@ -27,7 +23,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
 	off_t total = 0;
 	RESERVE_CONFIG_BUFFER(buffer, BUFSIZ);
 
-	if (src_fd < 0) goto out;
+	if (src_fd < 0)
+		goto out;
 
 	if (!size) {
 		size = BUFSIZ;

libbb/fflush_stdout_and_exit.c

@@ -13,6 +13,10 @@
 
 #include "libbb.h"
 
+// TODO: make it safe to call from NOFORK applets
+// Currently, it can exit(0). Even if it is made to do longjmp trick
+// (see sleep_and_die internals), zero cannot be passed thru this way!
+
 void fflush_stdout_and_exit(int retval)
 {
 	if (fflush(stdout))

libbb/make_directory.c

@@ -22,11 +22,10 @@
  * val.  Otherwise, pass -1 to get default permissions.
  */
 
-#include <errno.h>
-#include <unistd.h>
-#include <sys/stat.h>
 #include "libbb.h"
 
+/* This function is used from NOFORK applets. It must not allocate anything */
+
 int bb_make_directory (char *path, long mode, int flags)
 {
 	mode_t mask;

libbb/parse_mode.c

@@ -11,6 +11,8 @@
 
 #include "libbb.h"
 
+/* This function is used from NOFORK applets. It must not allocate anything */
+
 #define FILEMODEBITS (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
 
 int bb_parse_mode(const char *s, mode_t *current_mode)

libbb/remove_file.c

@@ -9,6 +9,8 @@
 
 #include "libbb.h"
 
+/* Used from NOFORK applets. Must not allocate anything */
+
 int remove_file(const char *path, int flags)
 {
 	struct stat path_stat;

util-linux/hexdump.c

@@ -9,10 +9,13 @@
  * Licensed under GPLv2 or later, see file License in this tarball for details.
  */
 
-#include "busybox.h"
 #include <getopt.h>
+#include "busybox.h"
 #include "dump.h"
 
+/* This is a NOEXEC applet. Be very careful! */
+
+
 static void bb_dump_addfile(char *name)
 {
 	char *p;
@@ -45,10 +48,10 @@ static const char add_first[] = "\"%07.7_Ax\n\"";
 static const char hexdump_opts[] = "bcdoxCe:f:n:s:v";
 
 static const struct suffix_mult suffixes[] = {
-	{"b",  512 },
-	{"k",  1024 },
-	{"m",  1024*1024 },
-	{NULL, 0 }
+	{ "b",  512 },
+	{ "k",  1024 },
+	{ "m",  1024*1024 },
+	{ NULL, 0 }
 };
 
 int hexdump_main(int argc, char **argv);