Apply post-1.10.1 patches

Bump version to 1.10.2

12 files changed, 308 insertions, 256 deletions

diff --git a/Makefile b/Makefile
index e18726fca..4feab0e6c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 VERSION = 1
 PATCHLEVEL = 10
-SUBLEVEL = 1
+SUBLEVEL = 2
 EXTRAVERSION =
 NAME = Unnamed
 
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 54c8f7665..b1a797a08 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -112,7 +112,7 @@ char get_header_tar(archive_handle_t *archive_handle)
 	archive_handle->offset += 512;
 
 	/* If there is no filename its an empty header */
-	if (tar.name[0] == 0) {
+	if (tar.name[0] == 0 && tar.prefix[0] == 0) {
 		if (end) {
 			/* This is the second consecutive empty header! End of archive!
 			 * Read until the end to empty the pipe from gz or bz2
@@ -211,9 +211,12 @@ char get_header_tar(archive_handle_t *archive_handle)
 	/* getOctal trashes subsequent field, therefore we call it
 	 * on fields in reverse order */
 	if (tar.devmajor[0]) {
+		char t = tar.prefix[0];
+		/* we trash prefix[0] here, but we DO need it later! */
 		unsigned minor = GET_OCTAL(tar.devminor);
 		unsigned major = GET_OCTAL(tar.devmajor);
 		file_header->device = makedev(major, minor);
+		tar.prefix[0] = t;
 	}
 	file_header->link_target = NULL;
 	if (!linkname && parse_names && tar.linkname[0]) {
diff --git a/coreutils/echo.c b/coreutils/echo.c
index fd6c950ea..cc9b9e6f4 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -27,10 +27,8 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-/* argc is unused, but removing it precludes compiler from
- * using call -> jump optimization */
+/* NB: can be used by shell even if not enabled as applet */
 
-int echo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int echo_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
 	const char *arg;
@@ -110,15 +108,19 @@ int echo_main(int argc ATTRIBUTE_UNUSED, char **argv)
 				}
 #if !ENABLE_FEATURE_FANCY_ECHO
 				/* SUSv3 specifies that octal escapes must begin with '0'. */
-				if ( (((unsigned char)*arg) - '1') >= 7)
+				if ( ((int)(unsigned char)(*arg) - '0') >= 8) /* '8' or bigger */
 #endif
 				{
 					/* Since SUSv3 mandates a first digit of 0, 4-digit octals
 					* of the form \0### are accepted. */
-					if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
-						arg++;
+					if (*arg == '0') {
+						/* NB: don't turn "...\0" into "...\" */
+						if (arg[1] && ((unsigned char)(arg[1]) - '0') < 8) {
+							arg++;
+						}
 					}
-					/* bb_process_escape_sequence can handle nul correctly */
+					/* bb_process_escape_sequence handles NUL correctly
+					 * ("...\" case). */
 					c = bb_process_escape_sequence(&arg);
 				}
 			}
diff --git a/debianutils/start_stop_daemon.c b/debianutils/start_stop_daemon.c
index 6f4b6b2bb..4e816bd19 100644
--- a/debianutils/start_stop_daemon.c
+++ b/debianutils/start_stop_daemon.c
@@ -11,7 +11,6 @@
 /* NB: we have a problem here with /proc/NN/exe usage, similar to
  * one fixed in killall/pidof */
 
-#include <getopt.h>
 #include <sys/resource.h>
 
 /* Override ENABLE_FEATURE_PIDFILE */
@@ -33,6 +32,7 @@ struct globals {
 	int user_id;
 	smallint quiet;
 	smallint signal_nr;
+	struct stat execstat;
 };
 #define G (*(struct globals*)&bb_common_bufsiz1)
 #define found             (G.found               )
@@ -43,6 +43,7 @@ struct globals {
 #define user_id           (G.user_id             )
 #define quiet             (G.quiet               )
 #define signal_nr         (G.signal_nr           )
+#define execstat          (G.execstat            )
 #define INIT_G() \
         do { \
 		user_id = -1; \
@@ -50,25 +51,21 @@ struct globals {
         } while (0)
 
 
-static int pid_is_exec(pid_t pid, const char *name)
+static int pid_is_exec(pid_t pid)
 {
+	struct stat st;
 	char buf[sizeof("/proc//exe") + sizeof(int)*3];
-	char *execbuf;
-	int n;
 
 	sprintf(buf, "/proc/%u/exe", pid);
-	n = strlen(name) + 1;
-	execbuf = xzalloc(n + 1);
-	readlink(buf, execbuf, n);
-	/* if readlink fails because link target is longer than strlen(name),
-	 * execbuf still contains "", and strcmp will return !0. */
-	n = strcmp(execbuf, name);
-	if (ENABLE_FEATURE_CLEAN_UP)
-		free(execbuf);
-	return !n; /* nonzero (true) if execbuf == name */
+	if (stat(buf, &st) < 0)
+		return 0;
+	if (st.st_dev == execstat.st_dev
+	 && st.st_ino == execstat.st_ino)
+		return 1;
+	return 0;
 }
 
-static int pid_is_user(int pid, int uid)
+static int pid_is_user(int pid)
 {
 	struct stat sb;
 	char buf[sizeof("/proc/") + sizeof(int)*3];
@@ -76,42 +73,39 @@ static int pid_is_user(int pid, int uid)
 	sprintf(buf, "/proc/%u", pid);
 	if (stat(buf, &sb) != 0)
 		return 0;
-	return (sb.st_uid == uid);
+	return (sb.st_uid == user_id);
 }
 
-static int pid_is_cmd(pid_t pid, const char *name)
+static int pid_is_cmd(pid_t pid)
 {
-	char fname[sizeof("/proc//stat") + sizeof(int)*3];
-	char *buf;
-	int r = 0;
-
-	sprintf(fname, "/proc/%u/stat", pid);
-	buf = xmalloc_open_read_close(fname, NULL);
-	if (buf) {
-		char *p = strchr(buf, '(');
-		if (p) {
-			char *pe = strrchr(++p, ')');
-			if (pe) {
-				*pe = '\0';
-				r = !strcmp(p, name);
-			}
-		}
-		free(buf);
-	}
-	return r;
+	char buf[256]; /* is it big enough? */
+	char *p, *pe;
+
+	sprintf(buf, "/proc/%u/stat", pid);
+	if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
+		return 0;
+	buf[sizeof(buf) - 1] = '\0'; /* paranoia */
+	p = strchr(buf, '(');
+	if (!p)
+		return 0;
+	pe = strrchr(++p, ')');
+	if (!pe)
+		return 0;
+	*pe = '\0';
+	return !strcmp(p, cmdname);
 }
 
 static void check(int pid)
 {
 	struct pid_list *p;
 
-	if (execname && !pid_is_exec(pid, execname)) {
+	if (execname && !pid_is_exec(pid)) {
 		return;
 	}
-	if (userspec && !pid_is_user(pid, user_id)) {
+	if (userspec && !pid_is_user(pid)) {
 		return;
 	}
-	if (cmdname && !pid_is_cmd(pid, cmdname)) {
+	if (cmdname && !pid_is_cmd(pid)) {
 		return;
 	}
 	p = xmalloc(sizeof(*p));
@@ -148,9 +142,16 @@ static void do_procinit(void)
 	procdir = xopendir("/proc");
 
 	pid = 0;
-	while ((entry = readdir(procdir)) != NULL) {
+	while(1) {
+		errno = 0; /* clear any previous error */
+		entry = readdir(procdir);
+// TODO: check for exact errno(s) which mean that we got stale entry
+		if (errno) /* Stale entry, process has died after opendir */
+			continue;
+		if (!entry) /* EOF, no more entries */
+			break;
 		pid = bb_strtou(entry->d_name, NULL, 10);
-		if (errno)
+		if (errno) /* NaN */
 			continue;
 		check(pid);
 	}
@@ -165,8 +166,6 @@ static int do_stop(void)
 	struct pid_list *p;
 	int killed = 0;
 
-	do_procinit();
-
 	if (cmdname) {
 		if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
 		if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
@@ -251,7 +250,7 @@ enum {
 };
 
 int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int start_stop_daemon_main(int argc, char **argv)
+int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
 	unsigned opt;
 	char *signame;
@@ -293,7 +292,7 @@ int start_stop_daemon_main(int argc, char **argv)
 //		if (retry_arg)
 //			retries = xatoi_u(retry_arg);
 //	)
-	argc -= optind;
+	//argc -= optind;
 	argv += optind;
 
 	if (userspec) {
@@ -301,14 +300,16 @@ int start_stop_daemon_main(int argc, char **argv)
 		if (errno)
 			user_id = xuname2uid(userspec);
 	}
+	if (execname)
+		xstat(execname, &execstat);
+
+	do_procinit(); /* Both start and stop needs to know current processes */
 
 	if (opt & CTX_STOP) {
 		int i = do_stop();
 		return (opt & OPT_OKNODO) ? 0 : (i <= 0);
 	}
 
-	do_procinit();
-
 	if (found) {
 		if (!quiet)
 			printf("%s already running\n%d\n", execname, found->pid);
diff --git a/include/libbb.h b/include/libbb.h
index 9f208b390..859b3bcf4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -288,20 +288,20 @@ enum {
 	 * SIGSYS   Bad argument to routine
 	 * SIGTRAP  Trace/breakpoint trap
 	 */
-	BB_FATAL_SIGS = 0
-		+ (1 << SIGHUP)
-		+ (1 << SIGINT)
-		+ (1 << SIGTERM)
-		+ (1 << SIGPIPE)   // Write to pipe with no readers
-		+ (1 << SIGQUIT)   // Quit from keyboard
-		+ (1 << SIGABRT)   // Abort signal from abort(3)
-		+ (1 << SIGALRM)   // Timer signal from alarm(2)
-		+ (1 << SIGVTALRM) // Virtual alarm clock
-		+ (1 << SIGXCPU)   // CPU time limit exceeded
-		+ (1 << SIGXFSZ)   // File size limit exceeded
-		+ (1 << SIGUSR1)   // Yes kids, these are also fatal!
-		+ (1 << SIGUSR2)
-		+ 0,
+	BB_FATAL_SIGS = (int)(0
+		+ (1LL << SIGHUP)
+		+ (1LL << SIGINT)
+		+ (1LL << SIGTERM)
+		+ (1LL << SIGPIPE)   // Write to pipe with no readers
+		+ (1LL << SIGQUIT)   // Quit from keyboard
+		+ (1LL << SIGABRT)   // Abort signal from abort(3)
+		+ (1LL << SIGALRM)   // Timer signal from alarm(2)
+		+ (1LL << SIGVTALRM) // Virtual alarm clock
+		+ (1LL << SIGXCPU)   // CPU time limit exceeded
+		+ (1LL << SIGXFSZ)   // File size limit exceeded
+		+ (1LL << SIGUSR1)   // Yes kids, these are also fatal!
+		+ (1LL << SIGUSR2)
+		+ 0),
 };
 void bb_signals(int sigs, void (*f)(int));
 /* Unlike signal() and bb_signals, sets handler with sigaction()
@@ -995,16 +995,16 @@ extern int update_passwd(const char *filename, const char *username,
 /* NB: typically you want to pass fd 0, not 1. Think 'applet | grep something' */
 int get_terminal_width_height(int fd, int *width, int *height);
 
-int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
-void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
+int ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
+void ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
 #if ENABLE_IOCTL_HEX2STR_ERROR
-int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name);
-void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name);
+int bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name);
+void bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name);
 #define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp,#request)
 #define xioctl(fd,request,argp)        bb_xioctl(fd,request,argp,#request)
 #else
-int bb_ioctl_or_warn(int fd, int request, void *argp);
-void bb_xioctl(int fd, int request, void *argp);
+int bb_ioctl_or_warn(int fd, unsigned request, void *argp);
+void bb_xioctl(int fd, unsigned request, void *argp);
 #define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp)
 #define xioctl(fd,request,argp)        bb_xioctl(fd,request,argp)
 #endif
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index b25386bc0..b05319a9d 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -518,8 +518,8 @@ static void exe_n_cwd_tab_completion(char *command, int type)
 
 	for (i = 0; i < npaths; i++) {
 		dir = opendir(paths[i]);
-		if (!dir)                       /* Don't print an error */
-			continue;
+		if (!dir)
+			continue; /* don't print an error */
 
 		while ((next = readdir(dir)) != NULL) {
 			int len1;
@@ -529,18 +529,21 @@ static void exe_n_cwd_tab_completion(char *command, int type)
 			if (strncmp(str_found, pfind, strlen(pfind)))
 				continue;
 			/* not see .name without .match */
-			if (*str_found == '.' && *pfind == 0) {
+			if (*str_found == '.' && *pfind == '\0') {
 				if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 					continue;
 				str_found = ""; /* only "/" */
 			}
 			found = concat_path_file(paths[i], str_found);
-			/* hmm, remover in progress? */
-			if (lstat(found, &st) < 0)
+			/* hmm, remove in progress? */
+			/* NB: stat() first so that we see is it a directory;
+			 * but if that fails, use lstat() so that
+			 * we still match dangling links */
+			if (stat(found, &st) && lstat(found, &st))
 				goto cont;
 			/* find with dirs? */
 			if (paths[i] != dirbuf)
-				strcpy(found, next->d_name);    /* only name */
+				strcpy(found, next->d_name); /* only name */
 
 			len1 = strlen(found);
 			found = xrealloc(found, len1 + 2);
@@ -548,7 +551,7 @@ static void exe_n_cwd_tab_completion(char *command, int type)
 			found[len1+1] = '\0';
 
 			if (S_ISDIR(st.st_mode)) {
-				/* name is directory      */
+				/* name is a directory */
 				if (found[len1-1] != '/') {
 					found[len1] = '/';
 				}
@@ -566,7 +569,7 @@ static void exe_n_cwd_tab_completion(char *command, int type)
 		closedir(dir);
 	}
 	if (paths != path1) {
-		free(paths[0]);                 /* allocated memory only in first member */
+		free(paths[0]); /* allocated memory is only in first member */
 		free(paths);
 	}
 #undef dirbuf
diff --git a/libbb/procps.c b/libbb/procps.c
index f67f7dcde..8946917a2 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -258,7 +258,7 @@ procps_status_t *procps_scan(procps_status_t* sp, int flags)
 				&sp->start_time,
 				&vsz,
 				&rss);
-			if (n != 10)
+			if (n != 11)
 				break;
 			/* vsz is in bytes and we want kb */
 			sp->vsz = vsz >> 10;
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index ca7f94173..84b9f922b 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -704,7 +704,7 @@ int get_terminal_width_height(int fd, int *width, int *height)
 	return ret;
 }
 
-void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...)
+void ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...)
 {
 	va_list p;
 
@@ -717,7 +717,7 @@ void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,..
 	}
 }
 
-int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
+int ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...)
 {
 	va_list p;
 	int ret = ioctl(fd, request, argp);
@@ -731,7 +731,7 @@ int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
 }
 
 #if ENABLE_IOCTL_HEX2STR_ERROR
-int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name)
+int bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name)
 {
 	int ret;
 
@@ -740,13 +740,13 @@ int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name)
 		bb_simple_perror_msg(ioctl_name);
 	return ret;
 }
-void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name)
+void bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name)
 {
 	if (ioctl(fd, request, argp) < 0)
 		bb_simple_perror_msg_and_die(ioctl_name);
 }
 #else
-int bb_ioctl_or_warn(int fd, int request, void *argp)
+int bb_ioctl_or_warn(int fd, unsigned request, void *argp)
 {
 	int ret;
 
@@ -755,7 +755,7 @@ int bb_ioctl_or_warn(int fd, int request, void *argp)
 		bb_perror_msg("ioctl %#x failed", request);
 	return ret;
 }
-void bb_xioctl(int fd, int request, void *argp)
+void bb_xioctl(int fd, unsigned request, void *argp)
 {
 	if (ioctl(fd, request, argp) < 0)
 		bb_perror_msg_and_die("ioctl %#x failed", request);
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
index bf98ea15d..f23b7ffc6 100644
--- a/miscutils/taskset.c
+++ b/miscutils/taskset.c
@@ -94,8 +94,10 @@ int taskset_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		unsigned i;
 		/* Do not allow zero mask: */
 		unsigned long long m = xstrtoull_range(aff, 0, 1, ULLONG_MAX);
+		enum { CNT_BIT = CPU_SETSIZE < sizeof(m)*8 ? CPU_SETSIZE : sizeof(m)*8 };
+
 		CPU_ZERO(&mask);
-		for (i = 0; i < CPU_SETSIZE; i++) {
+		for (i = 0; i < CNT_BIT; i++) {
 			unsigned long long bit = (1ULL << i);
 			if (bit & m)
 				CPU_SET(i, &mask);
diff --git a/networking/httpd.c b/networking/httpd.c
index 5e6037cbe..2c5455bf7 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -1457,6 +1457,11 @@ static void send_cgi_and_exit(
 				}
 			}
 #endif
+			/* restore default signal dispositions for CGI process */
+			signal(SIGCHLD, SIG_DFL);
+			signal(SIGPIPE, SIG_DFL);
+			signal(SIGHUP, SIG_DFL);
+
 			execv(fullpath, argv);
 			if (verbose)
 				bb_perror_msg("exec %s", fullpath);
diff --git a/scripts/trylink b/scripts/trylink
index 89e36b7e9..2322fbac6 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -66,7 +66,7 @@ check_libc_is_glibc() {
 	#if defined(__GLIBC__) && !defined(__UCLIBC__)
 	syntax error here
 	#endif
-	" >"$tempname"
+	" >"$tempname".c
     if $CC "$tempname".c -c -o "$tempname".o >/dev/null 2>&1; then
 	echo "$2";
     else
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 0edaf1047..f0a885482 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -12,6 +12,8 @@
 #include "libbb.h"
 #include "xregex.h"
 
+#define ENABLE_FEATURE_MDEV_RENAME_REGEXP 1
+
 struct globals {
 	int root_major, root_minor;
 };
@@ -21,7 +23,21 @@ struct globals {
 
 #define MAX_SYSFS_DEPTH 3 /* prevent infinite loops in /sys symlinks */
 
+/* We use additional 64+ bytes in make_device() */
+#define SCRATCH_SIZE 80
+
+static char *next_field(char *s)
+{
+	char *end = skip_non_whitespace(s);
+	s = skip_whitespace(end);
+	*end = '\0';
+	if (*s == '\0')
+		s = NULL;
+	return s;
+}
+
 /* mknod in /dev based on a path like "/sys/block/hda/hda1" */
+/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
 static void make_device(char *path, int delete)
 {
 	const char *device_name;
@@ -29,7 +45,7 @@ static void make_device(char *path, int delete)
 	int mode = 0660;
 	uid_t uid = 0;
 	gid_t gid = 0;
-	char *temp = path + strlen(path);
+	char *dev_maj_min = path + strlen(path);
 	char *command = NULL;
 	char *alias = NULL;
 
@@ -42,156 +58,178 @@ static void make_device(char *path, int delete)
 	 * also depend on path having writeable space after it.
 	 */
 	if (!delete) {
-		strcat(path, "/dev");
-		len = open_read_close(path, temp + 1, 64);
-		*temp++ = 0;
+		strcpy(dev_maj_min, "/dev");
+		len = open_read_close(path, dev_maj_min + 1, 64);
+		*dev_maj_min++ = '\0';
 		if (len < 1) {
-			if (ENABLE_FEATURE_MDEV_EXEC)
-				/* no "dev" file, so just try to run script */
-				*temp = 0;
-			else
+			if (!ENABLE_FEATURE_MDEV_EXEC)
 				return;
+			/* no "dev" file, so just try to run script */
+			*dev_maj_min = '\0';
 		}
 	}
 
 	/* Determine device name, type, major and minor */
 	device_name = bb_basename(path);
-	type = (path[5] == 'c' ? S_IFCHR : S_IFBLK);
+	/* http://kernel.org/doc/pending/hotplug.txt says that only
+	 * "/sys/block/..." is for block devices. "sys/bus" etc is not! */
+	type = (strncmp(&path[5], "block/", 6) == 0 ? S_IFBLK : S_IFCHR);
 
 	if (ENABLE_FEATURE_MDEV_CONF) {
 		FILE *fp;
-		char *line, *vline;
+		char *line, *val, *next;
 		unsigned lineno = 0;
 
-		/* If we have a config file, look up the user settings */
+		/* If we have config file, look up user settings */
 		fp = fopen_or_warn("/etc/mdev.conf", "r");
 		if (!fp)
 			goto end_parse;
 
-		while ((vline = line = xmalloc_getline(fp)) != NULL) {
-			int field;
-
-			/* A pristine copy for command execution. */
-			char *orig_line;
-			if (ENABLE_FEATURE_MDEV_EXEC)
-				orig_line = xstrdup(line);
+		while ((line = xmalloc_getline(fp)) != NULL) {
+			regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
 
 			++lineno;
+			trim(line);
+			if (!line[0])
+				goto next_line;
+
+			/* Fields: regex uid:gid mode [alias] [cmd] */
+
+			/* 1st field: regex to match this device */
+			next = next_field(line);
+			{
+				regex_t match;
+				int result;
+
+				/* Is this it? */
+				xregcomp(&match, line, REG_EXTENDED);
+				result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
+				regfree(&match);
+
+				//bb_error_msg("matches:");
+				//for (int i = 0; i < ARRAY_SIZE(off); i++) {
+				//	if (off[i].rm_so < 0) continue;
+				//	bb_error_msg("match %d: '%.*s'\n", i,
+				//		(int)(off[i].rm_eo - off[i].rm_so),
+				//		device_name + off[i].rm_so);
+				//}
+
+				/* If not this device, skip rest of line */
+				/* (regexec returns whole pattern as "range" 0) */
+				if (result || off[0].rm_so || off[0].rm_eo != strlen(device_name))
+					goto next_line;
+			}
 
-			/* Three fields: regex, uid:gid, mode */
-			for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_RENAME + ENABLE_FEATURE_MDEV_EXEC); ++field) {
-
-				/* Find a non-empty field */
-				char *val;
-				do {
-					val = strtok(vline, " \t");
-					vline = NULL;
-				} while (val && !*val);
-				if (!val) {
-					if (field)
-						break;
-					else
-						goto next_line;
-				}
-
-				if (field == 0) {
-
-					/* Regex to match this device */
-					regex_t match;
-					regmatch_t off;
-					int result;
-
-					/* Is this it? */
-					xregcomp(&match, val, REG_EXTENDED);
-					result = regexec(&match, device_name, 1, &off, 0);
-					regfree(&match);
-
-					/* If not this device, skip rest of line */
-					if (result || off.rm_so || off.rm_eo != strlen(device_name))
-						goto next_line;
-
-				} else if (field == 1) {
-
-					/* uid:gid device ownership */
-					struct passwd *pass;
-					struct group *grp;
-
-					char *str_uid = val;
-					char *str_gid = strchr(val, ':');
-					if (str_gid)
-						*str_gid = '\0', ++str_gid;
-
-					/* Parse UID */
-					pass = getpwnam(str_uid);
-					if (pass)
-						uid = pass->pw_uid;
-					else
-						uid = strtoul(str_uid, NULL, 10);
-
-					/* parse GID */
-					grp = getgrnam(str_gid);
-					if (grp)
-						gid = grp->gr_gid;
-					else
-						gid = strtoul(str_gid, NULL, 10);
-
-				} else if (field == 2) {
-
-					/* Mode device permissions */
-					mode = strtoul(val, NULL, 8);
-
-				} else if (ENABLE_FEATURE_MDEV_RENAME && field == 3) {
-
-					if (*val != '>')
-						++field;
-					else
-						alias = xstrdup(val + 1);
-
-				}
-
-				if (ENABLE_FEATURE_MDEV_EXEC && field == 3 + ENABLE_FEATURE_MDEV_RENAME) {
+			/* This line matches: stop parsing the file
+			 * after parsing the rest of fields */
 
-					/* Optional command to run */
-					const char *s = "@$*";
-					const char *s2 = strchr(s, *val);
+			/* 2nd field: uid:gid - device ownership */
+			if (!next) /* field must exist */
+				bb_error_msg_and_die("bad line %u", lineno);
+			val = next;
+			next = next_field(val);
+			{
+				struct passwd *pass;
+				struct group *grp;
+				char *str_uid = val;
+				char *str_gid = strchrnul(val, ':');
+
+				if (*str_gid)
+					*str_gid++ = '\0';
+				/* Parse UID */
+				pass = getpwnam(str_uid);
+				if (pass)
+					uid = pass->pw_uid;
+				else
+					uid = strtoul(str_uid, NULL, 10);
+				/* Parse GID */
+				grp = getgrnam(str_gid);
+				if (grp)
+					gid = grp->gr_gid;
+				else
+					gid = strtoul(str_gid, NULL, 10);
+			}
 
-					if (!s2) {
-						/* Force error */
-						field = 1;
-						break;
+			/* 3rd field: mode - device permissions */
+			if (!next) /* field must exist */
+				bb_error_msg_and_die("bad line %u", lineno);
+			val = next;
+			next = next_field(val);
+			mode = strtoul(val, NULL, 8);
+
+			/* 4th field (opt): >alias */
+			if (ENABLE_FEATURE_MDEV_RENAME) {
+				if (!next)
+					break;
+				if (*next == '>') {
+#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
+					char *s, *p;
+					unsigned i, n;
+#endif
+					val = next;
+					next = next_field(val);
+#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
+					/* substitute %1..9 with off[1..9], if any */
+					n = 0;
+					s = val;
+					while (*s && *s++ == '%')
+						n++;
+
+					p = alias = xzalloc(strlen(val) + n * strlen(device_name));
+					s = val + 1;
+					while (*s) {
+						*p = *s;
+						if ('%' == *s) {
+							i = (s[1] - '0');
+							if (i <= 9 && off[i].rm_so >= 0) {
+								n = off[i].rm_eo - off[i].rm_so;
+								strncpy(p, device_name + off[i].rm_so, n);
+								p += n - 1;
+								s++;
+							}
+						}
+						p++;
+						s++;
 					}
-
-					/* Correlate the position in the "@$*" with the delete
-					 * step so that we get the proper behavior.
-					 */
-					if ((s2 - s + 1) & (1 << delete))
-						command = xstrdup(orig_line + (val + 1 - line));
+#else
+					alias = xstrdup(val + 1);
+#endif
 				}
 			}
 
-			/* Did everything parse happily? */
-			if (field <= 2)
-				bb_error_msg_and_die("bad line %u", lineno);
-
+			/* The rest (opt): command to run */
+			if (!next)
+				break;
+			val = next;
+			if (ENABLE_FEATURE_MDEV_EXEC) {
+				const char *s = "@$*";
+				const char *s2 = strchr(s, *val);
+
+				if (!s2)
+					bb_error_msg_and_die("bad line %u", lineno);
+
+				/* Correlate the position in the "@$*" with the delete
+				 * step so that we get the proper behavior:
+				 * @cmd: run on create
+				 * $cmd: run on delete
+				 * *cmd: run on both
+				 */
+				if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
+					command = xstrdup(val + 1);
+				}
+			}
+			/* end of field parsing */
+			break; /* we found matching line, stop */
  next_line:
 			free(line);
-			if (ENABLE_FEATURE_MDEV_EXEC)
-				free(orig_line);
-		}
-
-		if (ENABLE_FEATURE_CLEAN_UP)
-			fclose(fp);
+		} /* end of "while line is read from /etc/mdev.conf" */
 
- end_parse:	/* nothing */ ;
+		free(line); /* in case we used "break" to get here */
+		fclose(fp);
 	}
+ end_parse:
 
-	if (!delete) {
-		if (sscanf(temp, "%d:%d", &major, &minor) != 2) {
-			if (ENABLE_FEATURE_MDEV_EXEC)
-				goto skip_creation;
-			else
-				return;
-		}
+	if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
 
 		if (ENABLE_FEATURE_MDEV_RENAME)
 			unlink(device_name);
@@ -208,39 +246,44 @@ static void make_device(char *path, int delete)
 			if (ENABLE_FEATURE_MDEV_RENAME && alias) {
 				char *dest;
 
-				temp = strrchr(alias, '/');
-				if (temp) {
-					if (temp[1] != '\0')
-						/* given a file name, so rename it */
-						*temp = '\0';
+				/* ">bar/": rename to bar/device_name */
+				/* ">bar[/]baz": rename to bar[/]baz */
+				dest = strrchr(alias, '/');
+				if (dest) { /* ">bar/[baz]" ? */
+					*dest = '\0'; /* mkdir bar */
 					bb_make_directory(alias, 0755, FILEUTILS_RECUR);
-					dest = concat_path_file(alias, device_name);
-				} else
-					dest = alias;
+					*dest = '/';
+					if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
+						dest = alias;
+						alias = concat_path_file(alias, device_name);
+						free(dest);
+					}
+				}
 
-				rename(device_name, dest); // TODO: xrename?
-				symlink(dest, device_name);
+				/* recreate device_name as a symlink to moved device node */
+				if (rename(device_name, alias) == 0) {
+					symlink(alias, device_name);
+				}
 
-				if (alias != dest)
-					free(alias);
-				free(dest);
+				free(alias);
 			}
 		}
- skip_creation: /* nothing */ ;
 	}
+
 	if (ENABLE_FEATURE_MDEV_EXEC && command) {
-		/* setenv will leak memory, so use putenv */
+		/* setenv will leak memory, use putenv/unsetenv/free */
 		char *s = xasprintf("MDEV=%s", device_name);
 		putenv(s);
 		if (system(command) == -1)
-			bb_perror_msg_and_die("cannot run %s", command);
+			bb_perror_msg_and_die("can't run '%s'", command);
 		s[4] = '\0';
 		unsetenv(s);
 		free(s);
 		free(command);
 	}
+
 	if (delete)
-		remove_file(device_name, FILEUTILS_FORCE);
+		unlink(device_name);
 }
 
 /* File callback for /sys/ traversal */
@@ -249,14 +292,15 @@ static int fileAction(const char *fileName,
                       void *userData,
                       int depth ATTRIBUTE_UNUSED)
 {
-	size_t len = strlen(fileName) - 4;
+	size_t len = strlen(fileName) - 4; /* can't underflow */
 	char *scratch = userData;
 
-	if (strcmp(fileName + len, "/dev"))
+	/* len check is for paranoid reasons */
+	if (strcmp(fileName + len, "/dev") || len >= PATH_MAX)
 		return FALSE;
 
 	strcpy(scratch, fileName);
-	scratch[len] = 0;
+	scratch[len] = '\0';
 	make_device(scratch, 0);
 
 	return TRUE;
@@ -287,12 +331,6 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
 	int cnt;
 	int firmware_fd, loading_fd, data_fd;
 
-	/* check for $FIRMWARE from kernel */
-	/* XXX: dont bother: open(NULL) works same as open("no-such-file")
-	 * if (!firmware)
-	 *	return;
-	 */
-
 	/* check for /lib/firmware/$FIRMWARE */
 	xchdir("/lib/firmware");
 	firmware_fd = xopen(firmware, O_RDONLY);
@@ -304,16 +342,15 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
 	xchdir(sysfs_path);
 	for (cnt = 0; cnt < 30; ++cnt) {
 		loading_fd = open("loading", O_WRONLY);
-		if (loading_fd == -1)
-			sleep(1);
-		else
-			break;
+		if (loading_fd != -1)
+			goto loading;
+		sleep(1);
 	}
-	if (loading_fd == -1)
-		goto out;
+	goto out;
 
+ loading:
 	/* tell kernel we're loading by `echo 1 > /sys/$DEVPATH/loading` */
-	if (write(loading_fd, "1", 1) != 1)
+	if (full_write(loading_fd, "1", 1) != 1)
 		goto out;
 
 	/* load firmware by `cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data */
@@ -324,9 +361,9 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
 
 	/* tell kernel result by `echo [0|-1] > /sys/$DEVPATH/loading` */
 	if (cnt > 0)
-		write(loading_fd, "0", 1);
+		full_write(loading_fd, "0", 1);
 	else
-		write(loading_fd, "-1", 2);
+		full_write(loading_fd, "-1", 2);
 
  out:
 	if (ENABLE_FEATURE_CLEAN_UP) {
@@ -341,16 +378,14 @@ int mdev_main(int argc, char **argv)
 {
 	char *action;
 	char *env_path;
-	RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
+	RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
 
 	xchdir("/dev");
 
-	if (argc == 2 && !strcmp(argv[1],"-s")) {
-
+	if (argc == 2 && !strcmp(argv[1], "-s")) {
 		/* Scan:
 		 * mdev -s
 		 */
-
 		struct stat st;
 
 		xstat("/", &st);
@@ -366,26 +401,27 @@ int mdev_main(int argc, char **argv)
 			fileAction, dirAction, temp, 0);
 
 	} else {
-
 		/* Hotplug:
 		 * env ACTION=... DEVPATH=... mdev
 		 * ACTION can be "add" or "remove"
 		 * DEVPATH is like "/block/sda" or "/class/input/mice"
 		 */
-
 		action = getenv("ACTION");
 		env_path = getenv("DEVPATH");
 		if (!action || !env_path)
 			bb_show_usage();
 
-		sprintf(temp, "/sys%s", env_path);
+		snprintf(temp, PATH_MAX, "/sys%s", env_path);
 		if (!strcmp(action, "remove"))
 			make_device(temp, 1);
 		else if (!strcmp(action, "add")) {
 			make_device(temp, 0);
 
-			if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE)
-				load_firmware(getenv("FIRMWARE"), temp);
+			if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
+				char *fw = getenv("FIRMWARE");
+				if (fw)
+					load_firmware(fw, temp);
+			}
 		}
 	}