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devfsd: futher sanitization by Tito <farmatito@tiscali.it>

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This commit is contained in:
Denis Vlasenko 2007-07-01 22:25:33 +00:00
parent c6753c1666
commit 10aea3e84e
1 changed files with 63 additions and 118 deletions
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181
miscutils/devfsd.c
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@ -234,11 +234,8 @@ static char get_old_ide_name(unsigned , unsigned);
static char *write_old_sd_name(char *, unsigned, unsigned, const char *);
/* busybox functions */
static void msg_logger(int pri, const char * fmt, ...)__attribute__((format(printf, 2, 3)));
static void msg_logger_and_die(int pri, const char * fmt, ...)__attribute__((noreturn, format(printf, 2, 3)));
static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag);
static void fork_and_execute(int die, char *arg0, char **arg);
static int get_uid_gid(int, const char *);
static void do_ioctl_or_die(int fd, int request, unsigned long event_mask_flag);
static int get_uid_gid(int flag, const char *string);
static void safe_memcpy(char * dest, const char * src, int len);
static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr);
static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr);
@ -246,7 +243,7 @@ static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr
/* Structs and vars */
static struct config_entry_struct *first_config = NULL;
static struct config_entry_struct *last_config = NULL;
static const char *mount_point = NULL;
static char *mount_point = NULL;
static volatile int caught_signal = FALSE;
static volatile int caught_sighup = FALSE;
static struct initial_symlink_struct
@ -286,83 +283,27 @@ static const char * const bb_msg_bad_config = "bad %s config file: %s";
static const char * const bb_msg_small_buffer = "buffer too small";
static const char * const bb_msg_variable_not_found = "variable: %s not found";
/* Busybox functions */
static void msg_logger(int pri, const char * fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = access("/dev/log", F_OK);
if (ret == 0) {
openlog(applet_name, 0, LOG_DAEMON);
vsyslog(pri , fmt, ap);
/* Man: A trailing newline is added when needed. */
closelog();
}
/* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */
if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) {
bb_error_msg(fmt, ap);
}
va_end(ap);
}
static void msg_logger_and_die(int pri, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
msg_logger(pri, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
/* Busybox stuff */
#if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
#define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args)
#define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args)
#define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args)
#if ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG
#define info_logger(p, fmt, args...) bb_info_msg(fmt, ## args)
#define msg_logger(p, fmt, args...) bb_error_msg(fmt, ## args)
#define msg_logger_and_die(p, fmt, args...) bb_error_msg_and_die(fmt, ## args)
#define error_logger(p, fmt, args...) bb_perror_msg(fmt, ## args)
#define error_logger_and_die(p, fmt, args...) bb_perror_msg_and_die(fmt, ## args)
#else
#define info_logger(p, fmt, args...)
#define msg_logger(p, fmt, args...)
#define msg_logger_and_die(p, fmt, args...) exit(1)
#define devfsd_perror_msg_and_die(fmt, args...) exit(1)
#define devfsd_error_msg_and_die(fmt, args...) exit(1)
#define devfsd_error_msg(fmt, args...)
#define error_logger(p, fmt, args...)
#define error_logger_and_die(p, fmt, args...) exit(1)
#endif
static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag)
static void do_ioctl_or_die(int fd, int request, unsigned long event_mask_flag)
{
if (ioctl(fd, request, event_mask_flag) == -1)
msg_logger_and_die(LOG_ERR, "ioctl");
}
static void fork_and_execute(int die, char *arg0, char **arg)
{
switch (fork()) {
case 0:
/* Child */
break;
case -1:
/* Parent: Error : die or return */
msg_logger(LOG_ERR,(char *)bb_msg_memory_exhausted);
if (die)
exit(EXIT_FAILURE);
return;
default:
/* Parent : ok : return or exit */
if (arg0 != NULL) {
wait(NULL);
return;
}
exit(EXIT_SUCCESS);
}
/* Child : if arg0 != NULL do execvp */
if (arg0 != NULL) {
BB_EXECVP(arg0, arg);
msg_logger_and_die(LOG_ERR, "execvp");
}
}
static void safe_memcpy(char *dest, const char *src, int len)
{
memcpy(dest , src, len);
@ -436,21 +377,17 @@ int devfsd_main(int argc, char **argv)
}
}
/* strip last / from mount point, so we don't need to check for it later */
while (argv[1][1] != '\0' && argv[1][strlen(argv[1]) - 1] == '/')
argv[1][strlen(argv[1]) - 1] = '\0';
mount_point = argv[1];
mount_point = bb_simplify_path(argv[1]);
xchdir(mount_point);
fd = xopen(".devfsd", O_RDONLY);
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
devfsd_perror_msg_and_die("FD_CLOEXEC");
bb_perror_msg_and_die("FD_CLOEXEC");
if (ioctl(fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1)
msg_logger_and_die(LOG_ERR, "ioctl");
bb_perror_msg_and_die("ioctl");
/*setup initial entries */
for (curr = initial_symlinks; curr->dest != NULL; ++curr)
@ -467,7 +404,7 @@ int devfsd_main(int argc, char **argv)
exit(EXIT_SUCCESS); /* -v */
}
/* Tell kernel we are special(i.e. we get to see hidden entries) */
do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
do_ioctl_or_die(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
sigemptyset(&new_action.sa_mask);
new_action.sa_flags = 0;
@ -475,7 +412,7 @@ int devfsd_main(int argc, char **argv)
/* Set up SIGHUP and SIGUSR1 handlers */
new_action.sa_handler = signal_handler;
if (sigaction(SIGHUP, &new_action, NULL) != 0 || sigaction(SIGUSR1, &new_action, NULL) != 0)
devfsd_error_msg_and_die("sigaction");
bb_error_msg_and_die("sigaction");
printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point);
@ -487,15 +424,23 @@ int devfsd_main(int argc, char **argv)
if (ENABLE_DEVFSD_FG_NP && no_polling)
exit(0);
if (ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG)
logmode = LOGMODE_BOTH;
else if (do_daemon == TRUE)
logmode = LOGMODE_SYSLOG;
/* This is the default */
/*else
logmode = LOGMODE_STDIO; */
if (do_daemon) {
/* Release so that the child can grab it */
do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
fork_and_execute(DIE, NULL, NULL);
setsid(); /* Prevent hangups and become pgrp leader */
do_ioctl_or_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
bb_daemonize_or_rexec(0, argv);
} else if (ENABLE_DEVFSD_FG_NP) {
setpgid(0, 0); /* Become process group leader */
}
while (TRUE) {
do_scan = do_servicing(fd, event_mask);
@ -504,6 +449,7 @@ int devfsd_main(int argc, char **argv)
if (do_scan)
dir_operation(SERVICE, mount_point, 0, NULL);
}
if (ENABLE_FEATURE_CLEAN_UP) free(mount_point);
} /* End Function main */
@ -522,24 +468,23 @@ static void read_config_file(char *path, int optional, unsigned long *event_mask
FILE *fp;
char buf[STRING_LENGTH];
char *line = NULL;
char *p;
if (stat(path, &statbuf) == 0) {
/* Don't read 0 length files: ignored */
/*if (statbuf.st_size == 0)
return;*/
if (S_ISDIR(statbuf.st_mode)) {
/* strip last / from dirname so we don't need to check for it later */
while (path && path[1] != '\0' && path[strlen(path) - 1] == '/')
path[strlen(path) - 1] = '\0';
dir_operation(READ_CONFIG, path, 0, event_mask);
p = bb_simplify_path(path);
dir_operation(READ_CONFIG, p, 0, event_mask);
free(p);
return;
}
if ((fp = fopen(path, "r")) != NULL) {
while (fgets(buf, STRING_LENGTH, fp) != NULL) {
/* Skip whitespace */
for (line = buf; isspace(*line); ++line)
/*VOID*/;
line = buf;
line = skip_whitespace(line);
if (line[0] == '\0' || line[0] == '#')
continue;
process_config_line(line, event_mask);
@ -550,8 +495,8 @@ static void read_config_file(char *path, int optional, unsigned long *event_mask
}
} else {
read_config_file_err:
if (optional == 0 && errno == ENOENT)
msg_logger_and_die(LOG_ERR, "read config file: %s: %m", path);
if (optional == 0 && errno == ENOENT)
error_logger_and_die(LOG_ERR, "read config file: %s", path);
}
} /* End Function read_config_file */
@ -600,7 +545,7 @@ static void process_config_line(const char *line, unsigned long *event_mask)
/* "INCLUDE" & "OPTIONAL_INCLUDE" */
if (i == 1 || i == 2) {
st_expr_expand(name, STRING_LENGTH, name, get_variable, NULL);
msg_logger(LOG_INFO, "%sinclude: %s", (toupper(when[0]) == 'I') ? "": "optional_", name);
info_logger(LOG_INFO, "%sinclude: %s", (toupper(when[0]) == 'I') ? "": "optional_", name);
read_config_file(name, (toupper(when[0]) == 'I') ? FALSE : TRUE, event_mask);
return;
}
@ -716,7 +661,7 @@ static int do_servicing(int fd, unsigned long event_mask)
/* Tell devfs what events we care about */
tmp_event_mask = event_mask;
do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
do_ioctl_or_die(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
while (!caught_signal) {
errno = 0;
bytes = read(fd,(char *) &info, sizeof info);
@ -809,11 +754,11 @@ static void action_permissions(const struct devfsd_notify_struct *info,
{
struct stat statbuf;
if (stat(info->devname, &statbuf) != 0 ||
chmod(info->devname,(statbuf.st_mode & S_IFMT) |(entry->u.permissions.mode & ~S_IFMT)) != 0 ||
chown(info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0
if (stat(info->devname, &statbuf) != 0
|| chmod(info->devname, (statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0
|| chown(info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0
)
msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m", info->devname);
error_logger(LOG_ERR, "Can't chmod or chown: %s", info->devname);
} /* End Function action_permissions */
static void action_modload(const struct devfsd_notify_struct *info,
@ -826,14 +771,14 @@ static void action_modload(const struct devfsd_notify_struct *info,
{
char *argv[6];
argv[0] =(char*)MODPROBE;
argv[1] =(char*)MODPROBE_SWITCH_1; /* "-k" */
argv[2] =(char*)MODPROBE_SWITCH_2; /* "-C" */
argv[3] =(char*)CONFIG_MODULES_DEVFS;
argv[0] = (char*)MODPROBE;
argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */
argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */
argv[3] = (char*)CONFIG_MODULES_DEVFS;
argv[4] = concat_path_file("/dev", info->devname); /* device */
argv[5] = NULL;
fork_and_execute(DIE, argv[0], argv);
wait4pid(xspawn(argv));
free(argv[4]);
} /* End Function action_modload */
@ -865,7 +810,7 @@ static void action_execute(const struct devfsd_notify_struct *info,
argv[count] = largv[count];
}
argv[count] = NULL;
fork_and_execute(NO_DIE, argv[0], argv);
wait4pid(spawn(argv));
} /* End Function action_execute */
@ -913,7 +858,7 @@ static void action_copy(const struct devfsd_notify_struct *info,
new_mode |= S_ISVTX;
ret = copy_inode(destination, &dest_stat, new_mode, source, &source_stat);
if (ENABLE_DEBUG && ret && (errno != EEXIST))
msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination);
error_logger(LOG_ERR, "copy_inode: %s to %s", source, destination);
} /* End Function action_copy */
static void action_compat(const struct devfsd_notify_struct *info, unsigned int action)
@ -1007,7 +952,7 @@ static void action_compat(const struct devfsd_notify_struct *info, unsigned int
case AC_RMNEWCOMPAT:
ret = unlink(compat_name);
if (ENABLE_DEBUG && ret)
msg_logger(LOG_ERR, "unlink: %s: %m", compat_name);
error_logger(LOG_ERR, "unlink: %s", compat_name);
break;
/*esac*/
} /* switch (action) */
@ -1022,7 +967,7 @@ static void restore(char *spath, struct stat source_stat, int rootlen)
dpath = concat_path_file(mount_point, spath + rootlen);
lstat(dpath, &dest_stat);
free(dpath);
if (S_ISLNK(source_stat.st_mode) ||(source_stat.st_mode & S_ISVTX))
if (S_ISLNK(source_stat.st_mode) || (source_stat.st_mode & S_ISVTX))
copy_inode(dpath, &dest_stat,(source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
if (S_ISDIR(source_stat.st_mode))
@ -1198,7 +1143,7 @@ static void signal_handler(int sig)
if (sig == SIGHUP)
caught_sighup = TRUE;
msg_logger(LOG_INFO, "Caught signal %d", sig);
info_logger(LOG_INFO, "Caught signal %d", sig);
} /* End Function signal_handler */
static const char *get_variable(const char *variable, void *info)
@ -1211,7 +1156,7 @@ static const char *get_variable(const char *variable, void *info)
int i;
if (gethostname(hostname, STRING_LENGTH - 1) != 0)
msg_logger_and_die(LOG_ERR, "gethostname: %m");
error_logger_and_die(LOG_ERR, "gethostname");
/* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
hostname[STRING_LENGTH - 1] = '\0';
@ -1651,7 +1596,7 @@ int st_expr_expand(char *output, unsigned int length, const char *input,
if (isspace(ch) ||(ch == '/') ||(ch == '\0')) {
/* User's own home directory: leave separator for next time */
if ((env = getenv("HOME")) == NULL) {
msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
info_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
return FALSE;
}
len = strlen(env);
@ -1670,7 +1615,7 @@ int st_expr_expand(char *output, unsigned int length, const char *input,
safe_memcpy(tmp, input, len);
input = ptr - 1;
if ((pwent = getpwnam(tmp)) == NULL) {
msg_logger(LOG_INFO, "no pwent for: %s", tmp);
info_logger(LOG_INFO, "no pwent for: %s", tmp);
return FALSE;
}
len = strlen(pwent->pw_dir);
@ -1695,7 +1640,7 @@ int st_expr_expand(char *output, unsigned int length, const char *input,
}
return FALSE;
st_expr_expand_out:
msg_logger(LOG_INFO, bb_msg_small_buffer);
info_logger(LOG_INFO, bb_msg_small_buffer);
return FALSE;
} /* End Function st_expr_expand */
@ -1750,7 +1695,7 @@ static const char *expand_variable(char *buffer, unsigned int length,
safe_memcpy(tmp, input, len);
input = ptr - 1;
if ((env = get_variable_v2(tmp, func, info)) == NULL) {
msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
info_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
return NULL;
}
len = strlen(env);
@ -1778,7 +1723,7 @@ static const char *expand_variable(char *buffer, unsigned int length,
return input + len;
}
if (ch != ':' || ptr[1] != '-') {
msg_logger(LOG_INFO, "illegal char in var name");
info_logger(LOG_INFO, "illegal char in var name");
return NULL;
}
/* It's that handy "${var:-word}" expression. Check if var is defined */
@ -1801,7 +1746,7 @@ static const char *expand_variable(char *buffer, unsigned int length,
--open_braces;
break;
case '\0':
msg_logger(LOG_INFO,"\"}\" not found in: %s", input);
info_logger(LOG_INFO,"\"}\" not found in: %s", input);
return NULL;
default:
break;
@ -1840,7 +1785,7 @@ static const char *expand_variable(char *buffer, unsigned int length,
*out_pos += len;
return input;
expand_variable_out:
msg_logger(LOG_INFO, bb_msg_small_buffer);
info_logger(LOG_INFO, bb_msg_small_buffer);
return NULL;
} /* End Function expand_variable */