summaryrefslogtreecommitdiffstats
path: root/package/busybox/busybox-1.10.1-mdev.patch
diff options
context:
space:
mode:
Diffstat (limited to 'package/busybox/busybox-1.10.1-mdev.patch')
-rw-r--r--package/busybox/busybox-1.10.1-mdev.patch510
1 files changed, 510 insertions, 0 deletions
diff --git a/package/busybox/busybox-1.10.1-mdev.patch b/package/busybox/busybox-1.10.1-mdev.patch
new file mode 100644
index 000000000..b5788829a
--- /dev/null
+++ b/package/busybox/busybox-1.10.1-mdev.patch
@@ -0,0 +1,510 @@
+--- busybox-1.10.1/util-linux/mdev.c Sat Apr 19 05:50:39 2008
++++ busybox-1.10.1-mdev/util-linux/mdev.c Sat Apr 26 17:15:54 2008
+@@ -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 @@
+
+ #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 @@
+ 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 +58,177 @@
+ * 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;
++ while ((line = xmalloc_getline(fp)) != NULL) {
++ regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
+
+- /* A pristine copy for command execution. */
+- char *orig_line;
+- if (ENABLE_FEATURE_MDEV_EXEC)
+- orig_line = xstrdup(line);
+-
+ ++lineno;
++ trim(line);
++ if (!line[0])
++ goto next_line;
+
+- /* Three fields: regex, uid:gid, mode */
+- for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_RENAME + ENABLE_FEATURE_MDEV_EXEC); ++field) {
++ /* Fields: regex uid:gid mode [alias] [cmd] */
+
+- /* 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;
+- }
++ /* 1st field: regex to match this device */
++ next = next_field(line);
++ {
++ regex_t match;
++ int result;
+
+- if (field == 0) {
++ /* Is this it? */
++ xregcomp(&match, line, REG_EXTENDED);
++ result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
++ regfree(&match);
+
+- /* Regex to match this device */
+- regex_t match;
+- regmatch_t off;
+- int result;
++ //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);
++ //}
+
+- /* 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 */
++ /* (regexec returns whole pattern as "range" 0) */
++ if (result || off[0].rm_so || off[0].rm_eo != strlen(device_name))
++ goto next_line;
++ }
+
+- /* If not this device, skip rest of line */
+- if (result || off.rm_so || off.rm_eo != strlen(device_name))
+- goto next_line;
++ /* This line matches: stop parsing the file
++ * after parsing the rest of fields */
+
+- } else if (field == 1) {
++ /* 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, ':');
+
+- /* uid:gid device ownership */
+- struct passwd *pass;
+- struct group *grp;
++ 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);
++ }
+
+- char *str_uid = val;
+- char *str_gid = strchr(val, ':');
+- if (str_gid)
+- *str_gid = '\0', ++str_gid;
++ /* 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);
+
+- /* Parse UID */
+- pass = getpwnam(str_uid);
+- if (pass)
+- uid = pass->pw_uid;
+- else
+- uid = strtoul(str_uid, NULL, 10);
++ /* 4th field (opt): >alias */
++ if (ENABLE_FEATURE_MDEV_RENAME) {
++ if (!next)
++ break;
++ val = next;
++ next = next_field(val);
++ if (*val == '>') {
++#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
++ /* substitute %1..9 with off[1..9], if any */
++ char *s, *p;
++ unsigned i, n;
+
+- /* parse GID */
+- grp = getgrnam(str_gid);
+- if (grp)
+- gid = grp->gr_gid;
+- else
+- gid = strtoul(str_gid, NULL, 10);
++ n = 0;
++ s = val;
++ while (*s && *s++ == '%')
++ n++;
+
+- } 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);
+-
++ 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++;
++ }
++#else
++ alias = xstrdup(val + 1);
++#endif
+ }
++ }
+
+- if (ENABLE_FEATURE_MDEV_EXEC && field == 3 + ENABLE_FEATURE_MDEV_RENAME) {
++ /* The rest (opt): command to run */
++ if (!next)
++ break;
++ val = next;
++ if (ENABLE_FEATURE_MDEV_EXEC) {
++ const char *s = "@$*";
++ const char *s2 = strchr(s, *val);
+
+- /* Optional command to run */
+- const char *s = "@$*";
+- const char *s2 = strchr(s, *val);
++ if (!s2)
++ bb_error_msg_and_die("bad line %u", lineno);
+
+- if (!s2) {
+- /* Force error */
+- field = 1;
+- break;
+- }
+-
+- /* Correlate the position in the "@$*" with the delete
+- * step so that we get the proper behavior.
+- */
+- if ((s2 - s + 1) & (1 << delete))
+- command = xstrdup(orig_line + (val + 1 - line));
++ /* Correlate the position in the "@$*" 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);
+ }
+ }
+-
+- /* Did everything parse happily? */
+- if (field <= 2)
+- bb_error_msg_and_die("bad line %u", lineno);
+-
++ /* end of field parsing */
++ break; /* we found matching line, stop */
+ next_line:
+ free(line);
+- if (ENABLE_FEATURE_MDEV_EXEC)
+- free(orig_line);
+- }
++ } /* end of "while line is read from /etc/mdev.conf" */
+
+- if (ENABLE_FEATURE_CLEAN_UP)
+- fclose(fp);
+-
+- 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 +245,44 @@
+ 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 +291,15 @@
+ 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 +330,6 @@
+ 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 +341,15 @@
+ 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/$DEVPATH/data */
+@@ -324,9 +360,9 @@
+
+ /* tell kernel result by `echo [0|-1] > /sys/$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 +377,14 @@
+ {
+ 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 +400,27 @@
+ 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);
++ }
+ }
+ }
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 22:46:06 +0000