diff options
Diffstat (limited to 'util-linux/mdev.c')
| -rw-r--r-- | util-linux/mdev.c | 55 |
1 files changed, 26 insertions, 29 deletions
diff --git a/util-linux/mdev.c b/util-linux/mdev.c index d0d010382..5ac801555 100644 --- a/util-linux/mdev.c +++ b/util-linux/mdev.c @@ -59,8 +59,7 @@ static void make_device(char *path, int delete) int major, minor, type, len; int mode = 0660; #if ENABLE_FEATURE_MDEV_CONF - uid_t uid = 0; - gid_t gid = 0; + struct bb_uidgid_t ugid = { 0, 0 }; parser_t *parser; char *tokens[5]; #endif @@ -78,9 +77,10 @@ static void make_device(char *path, int delete) /* Try to read major/minor string. Note that the kernel puts \n after * the data, so we don't need to worry about null terminating the string - * because sscanf() will stop at the first nondigit, which \n is. We - * also depend on path having writeable space after it. + * because sscanf() will stop at the first nondigit, which \n is. + * We also depend on path having writeable space after it. */ + major = -1; if (!delete) { strcpy(dev_maj_min, "/dev"); len = open_read_close(path, dev_maj_min + 1, 64); @@ -90,6 +90,8 @@ static void make_device(char *path, int delete) return; /* no "dev" file, so just try to run script */ *dev_maj_min = '\0'; + } else if (sscanf(dev_maj_min, "%u:%u", &major, &minor) != 2) { + major = -1; } } @@ -113,8 +115,23 @@ static void make_device(char *path, int delete) /* Fields: regex uid:gid mode [alias] [cmd] */ - /* 1st field: regex to match this device */ - { + /* 1st field: @<numeric maj,min>... */ + if (tokens[0][0] == '@') { + /* @major,minor[-last] */ + /* (useful when name is ambiguous: + * "/sys/class/usb/lp0" and + * "/sys/class/printer/lp0") */ + int cmaj, cmin0, cmin1, sc; + if (major < 0) + continue; /* no dev, no match */ + sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1); + if (sc < 1 || major != cmaj + || (sc == 2 && minor != cmin0) + || (sc == 3 && (minor < cmin0 || minor > cmin1)) + ) { + continue; /* no match */ + } + } else { /* ... or regex to match device name */ regex_t match; int result; @@ -144,27 +161,7 @@ static void make_device(char *path, int delete) * after parsing the rest of fields */ /* 2nd field: uid:gid - device ownership */ - { - struct passwd *pass; - struct group *grp; - char *str_uid = tokens[1]; - char *str_gid = strchrnul(str_uid, ':'); - - 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); - } + parse_chown_usergroup_or_die(&ugid, tokens[1]); /* 3rd field: mode - device permissions */ mode = strtoul(tokens[2], NULL, 8); @@ -243,7 +240,7 @@ static void make_device(char *path, int delete) config_close(parser); #endif /* ENABLE_FEATURE_MDEV_CONF */ - if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) { + if (!delete && major >= 0) { if (ENABLE_FEATURE_MDEV_RENAME) unlink(device_name); @@ -255,7 +252,7 @@ static void make_device(char *path, int delete) symlink(device_name, "root"); #if ENABLE_FEATURE_MDEV_CONF - chown(device_name, uid, gid); + chown(device_name, ugid.uid, ugid.gid); #if ENABLE_FEATURE_MDEV_RENAME if (alias) { |