mdev: plug a few memory and fd leaks; simplify code a bit
This commit is contained in:
Denis Vlasenko
parent
e1caabbb75
commit
cf26ab70c1
@ -82,8 +82,10 @@ int remove_file(const char *path, int flags)
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}
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/* !ISDIR */
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if ((!(flags & FILEUTILS_FORCE) && access(path, W_OK) < 0
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&& !S_ISLNK(path_stat.st_mode) && isatty(0))
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if ((!(flags & FILEUTILS_FORCE)
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&& access(path, W_OK) < 0
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&& !S_ISLNK(path_stat.st_mode)
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&& isatty(0))
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|| (flags & FILEUTILS_INTERACTIVE)
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) {
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fprintf(stderr, "%s: remove '%s'? ", applet_name, path);
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@ -25,7 +25,6 @@ testing "mdev add /block/sda" \
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ls -ln mdev.testdir/dev | $FILTER_LS" \
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"\
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mdev: /etc/mdev.conf: No such file or directory
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mdev: chdir(/lib/firmware): No such file or directory
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brw-rw---- 1 8,0 sda
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" \
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"" ""
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@ -21,7 +21,11 @@ struct globals {
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#define MAX_SYSFS_DEPTH 3 /* prevent infinite loops in /sys symlinks */
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/* We use additional 64+ bytes in make_device() */
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#define SCRATCH_SIZE 80
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/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
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/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
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static void make_device(char *path, int delete)
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{
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const char *device_name;
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@ -29,7 +33,7 @@ static void make_device(char *path, int delete)
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int mode = 0660;
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uid_t uid = 0;
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gid_t gid = 0;
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char *temp = path + strlen(path);
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char *dev_maj_min = path + strlen(path);
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char *command = NULL;
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char *alias = NULL;
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@ -42,21 +46,20 @@ static void make_device(char *path, int delete)
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* also depend on path having writeable space after it.
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*/
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if (!delete) {
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strcat(path, "/dev");
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len = open_read_close(path, temp + 1, 64);
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*temp++ = 0;
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strcpy(dev_maj_min, "/dev");
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len = open_read_close(path, dev_maj_min + 1, 64);
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*dev_maj_min++ = '\0';
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if (len < 1) {
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if (ENABLE_FEATURE_MDEV_EXEC)
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/* no "dev" file, so just try to run script */
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*temp = 0;
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else
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if (!ENABLE_FEATURE_MDEV_EXEC)
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return;
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/* no "dev" file, so just try to run script */
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*dev_maj_min = '\0';
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}
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}
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/* Determine device name, type, major and minor */
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device_name = bb_basename(path);
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type = (path[5] == 'c' ? S_IFCHR : S_IFBLK);
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type = (path[5] == 'c' ? S_IFCHR : S_IFBLK); /* "/sys/[c]lass"? */
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if (ENABLE_FEATURE_MDEV_CONF) {
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FILE *fp;
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@ -70,15 +73,18 @@ static void make_device(char *path, int delete)
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while ((vline = line = xmalloc_fgetline(fp)) != NULL) {
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int field;
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/* A pristine copy for command execution. */
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char *orig_line;
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if (ENABLE_FEATURE_MDEV_EXEC)
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orig_line = xstrdup(line);
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orig_line = xstrdup(line); /* pristine copy for command execution. */
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++lineno;
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/* Three fields: regex, uid:gid, mode */
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// TODO: get rid of loop,
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// just linear skip_whitespace() style code will do!
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// (will also get rid of orig_line).
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/* Fields: regex uid:gid mode [alias] [cmd] */
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for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_RENAME + ENABLE_FEATURE_MDEV_EXEC); ++field) {
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/* Find a non-empty field */
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@ -117,9 +123,9 @@ static void make_device(char *path, int delete)
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struct group *grp;
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char *str_uid = val;
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char *str_gid = strchr(val, ':');
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if (str_gid)
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*str_gid = '\0', ++str_gid;
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char *str_gid = strchrnul(val, ':');
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if (*str_gid)
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*str_gid++ = '\0';
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/* Parse UID */
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pass = getpwnam(str_uid);
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@ -128,7 +134,7 @@ static void make_device(char *path, int delete)
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else
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uid = strtoul(str_uid, NULL, 10);
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/* parse GID */
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/* Parse GID */
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grp = getgrnam(str_gid);
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if (grp)
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gid = grp->gr_gid;
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@ -144,8 +150,10 @@ static void make_device(char *path, int delete)
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if (*val != '>')
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++field;
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else
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else {
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free(alias); /* don't leak in case we matched it on prev line */
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alias = xstrdup(val + 1);
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}
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}
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@ -162,12 +170,17 @@ static void make_device(char *path, int delete)
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}
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/* Correlate the position in the "@$*" with the delete
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* step so that we get the proper behavior.
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* step so that we get the proper behavior:
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* @cmd: run on create
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* $cmd: run on delete
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* *cmd: run on both
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*/
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if ((s2 - s + 1) & (1 << delete))
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if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
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free(command); /* don't leak in case we matched it on prev line */
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command = xstrdup(orig_line + (val + 1 - line));
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}
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}
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}
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} /* end of "for every field" */
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/* Did everything parse happily? */
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if (field <= 2)
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@ -177,21 +190,13 @@ static void make_device(char *path, int delete)
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free(line);
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if (ENABLE_FEATURE_MDEV_EXEC)
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free(orig_line);
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}
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} /* end of "while line is read from /etc/mdev.conf" */
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if (ENABLE_FEATURE_CLEAN_UP)
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fclose(fp);
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end_parse: /* nothing */ ;
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fclose(fp);
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}
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end_parse:
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if (!delete) {
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if (sscanf(temp, "%d:%d", &major, &minor) != 2) {
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if (ENABLE_FEATURE_MDEV_EXEC)
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goto skip_creation;
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else
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return;
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}
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if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
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if (ENABLE_FEATURE_MDEV_RENAME)
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unlink(device_name);
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@ -208,39 +213,39 @@ static void make_device(char *path, int delete)
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if (ENABLE_FEATURE_MDEV_RENAME && alias) {
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char *dest;
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temp = strrchr(alias, '/');
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if (temp) {
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if (temp[1] != '\0')
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dest = strrchr(alias, '/');
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if (dest) {
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if (dest[1] != '\0')
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/* given a file name, so rename it */
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*temp = '\0';
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*dest = '\0';
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bb_make_directory(alias, 0755, FILEUTILS_RECUR);
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dest = concat_path_file(alias, device_name);
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free(alias);
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} else
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dest = alias;
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rename(device_name, dest); // TODO: xrename?
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rename(device_name, dest);
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symlink(dest, device_name);
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if (alias != dest)
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free(alias);
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free(dest);
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}
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}
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skip_creation: /* nothing */ ;
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}
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if (ENABLE_FEATURE_MDEV_EXEC && command) {
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/* setenv will leak memory, so use putenv */
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/* setenv will leak memory, use putenv/unsetenv/free */
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char *s = xasprintf("MDEV=%s", device_name);
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putenv(s);
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if (system(command) == -1)
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bb_perror_msg_and_die("cannot run %s", command);
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bb_perror_msg_and_die("can't run '%s'", command);
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s[4] = '\0';
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unsetenv(s);
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free(s);
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free(command);
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}
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if (delete)
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remove_file(device_name, FILEUTILS_FORCE);
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unlink(device_name);
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}
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/* File callback for /sys/ traversal */
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@ -249,14 +254,15 @@ static int fileAction(const char *fileName,
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void *userData,
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int depth ATTRIBUTE_UNUSED)
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{
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size_t len = strlen(fileName) - 4;
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size_t len = strlen(fileName) - 4; /* can't underflow */
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char *scratch = userData;
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if (strcmp(fileName + len, "/dev"))
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/* len check is for paranoid reasons */
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if (strcmp(fileName + len, "/dev") || len >= PATH_MAX)
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return FALSE;
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strcpy(scratch, fileName);
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scratch[len] = 0;
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scratch[len] = '\0';
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make_device(scratch, 0);
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return TRUE;
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@ -287,12 +293,6 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
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int cnt;
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int firmware_fd, loading_fd, data_fd;
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/* check for $FIRMWARE from kernel */
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/* XXX: dont bother: open(NULL) works same as open("no-such-file")
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* if (!firmware)
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* return;
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*/
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/* check for /lib/firmware/$FIRMWARE */
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xchdir("/lib/firmware");
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firmware_fd = xopen(firmware, O_RDONLY);
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@ -304,16 +304,15 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
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xchdir(sysfs_path);
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for (cnt = 0; cnt < 30; ++cnt) {
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loading_fd = open("loading", O_WRONLY);
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if (loading_fd == -1)
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sleep(1);
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else
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break;
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if (loading_fd != -1)
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goto loading;
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sleep(1);
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}
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if (loading_fd == -1)
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goto out;
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goto out;
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loading:
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/* tell kernel we're loading by `echo 1 > /sys/$DEVPATH/loading` */
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if (write(loading_fd, "1", 1) != 1)
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if (full_write(loading_fd, "1", 1) != 1)
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goto out;
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/* load firmware by `cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data */
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@ -324,9 +323,9 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
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/* tell kernel result by `echo [0|-1] > /sys/$DEVPATH/loading` */
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if (cnt > 0)
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write(loading_fd, "0", 1);
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full_write(loading_fd, "0", 1);
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else
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write(loading_fd, "-1", 2);
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full_write(loading_fd, "-1", 2);
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out:
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if (ENABLE_FEATURE_CLEAN_UP) {
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@ -341,16 +340,14 @@ int mdev_main(int argc, char **argv)
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{
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char *action;
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char *env_path;
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RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
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RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
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xchdir("/dev");
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if (argc == 2 && !strcmp(argv[1],"-s")) {
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if (argc == 2 && !strcmp(argv[1], "-s")) {
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/* Scan:
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* mdev -s
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*/
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struct stat st;
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xstat("/", &st);
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@ -366,26 +363,27 @@ int mdev_main(int argc, char **argv)
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fileAction, dirAction, temp, 0);
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} else {
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/* Hotplug:
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* env ACTION=... DEVPATH=... mdev
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* ACTION can be "add" or "remove"
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* DEVPATH is like "/block/sda" or "/class/input/mice"
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*/
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action = getenv("ACTION");
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env_path = getenv("DEVPATH");
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if (!action || !env_path)
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bb_show_usage();
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sprintf(temp, "/sys%s", env_path);
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snprintf(temp, PATH_MAX, "/sys%s", env_path);
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if (!strcmp(action, "remove"))
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make_device(temp, 1);
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else if (!strcmp(action, "add")) {
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make_device(temp, 0);
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if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE)
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load_firmware(getenv("FIRMWARE"), temp);
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if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
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char *fw = getenv("FIRMWARE");
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if (fw)
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load_firmware(fw, temp);
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}
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}
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}
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