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mount: recognize "dirsync" (closes bug 835)

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mount: sanitize environ if called by non-root
*: adjust for slightly different sanitize routine
This commit is contained in:
Denis Vlasenko 2008-02-18 11:08:33 +00:00
parent 56244736ec
commit c9ca0a3274
7 changed files with 37 additions and 26 deletions
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4
include/libbb.h
View File

@ -684,8 +684,8 @@ enum {
#endif
void bb_daemonize_or_rexec(int flags, char **argv);
void bb_sanitize_stdio(void);
/* Clear dangerous stuff, set PATH */
void sanitize_env_for_suid(void);
/* Clear dangerous stuff, set PATH. Return 1 if was run by different user. */
int sanitize_env_if_suid(void);
extern const char *opt_complementary;

11
libbb/login.c
View File

@ -116,12 +116,19 @@ static const char forbid[] ALIGN1 =
"LD_NOWARN" "\0"
"LD_KEEPDIR" "\0";
void sanitize_env_for_suid(void)
int sanitize_env_if_suid(void)
{
const char *p = forbid;
const char *p;
if (getuid() == geteuid())
return 0;
p = forbid;
do {
unsetenv(p);
p += strlen(p) + 1;
} while (*p);
putenv((char*)bb_PATH_root_path);
return 1; /* we indeed were run by different user! */
}

9
loginutils/login.c
View File

@ -254,20 +254,17 @@ int login_main(int argc, char **argv)
short_tty = full_tty;
username[0] = '\0';
amroot = (getuid() == 0);
signal(SIGALRM, alarm_handler);
alarm(TIMEOUT);
/* More of suid paranoia if called by non-root */
amroot = !sanitize_env_if_suid(); /* Clear dangerous stuff, set PATH */
/* Mandatory paranoia for suid applet:
* ensure that fd# 0,1,2 are opened (at least to /dev/null)
* and any extra open fd's are closed.
* (The name of the function is misleading. Not daemonizing here.) */
bb_daemonize_or_rexec(DAEMON_ONLY_SANITIZE | DAEMON_CLOSE_EXTRA_FDS, NULL);
/* More of suid paranoia if called by non-root */
if (!amroot) {
/* Clear dangerous stuff, set PATH */
sanitize_env_for_suid();
}
opt = getopt32(argv, "f:h:p", &opt_user, &opt_host);
if (opt & LOGIN_OPT_f) {

2
loginutils/sulogin.c
View File

@ -49,7 +49,7 @@ int sulogin_main(int argc, char **argv)
}
/* Clear dangerous stuff, set PATH */
sanitize_env_for_suid();
sanitize_env_if_suid();
// bb_askpass() already handles this
// signal(SIGALRM, catchalarm);

11
miscutils/crontab.c
View File

@ -97,7 +97,6 @@ int crontab_main(int argc, char **argv)
char *user_name; /* -u USER */
int fd;
int opt_ler;
uid_t my_uid;
/* file [opts] Replace crontab from file
* - [opts] Replace crontab from stdin
@ -118,25 +117,22 @@ int crontab_main(int argc, char **argv)
OPT_ler = OPT_l + OPT_e + OPT_r,
};
my_uid = getuid();
opt_complementary = "?1:dr"; /* max one argument; -d implies -r */
opt_ler = getopt32(argv, "u:c:lerd", &user_name, &crontab_dir);
argv += optind;
if (my_uid != geteuid()) { /* run by non-root? */
if (sanitize_env_if_suid()) { /* Clears dangerous stuff, sets PATH */
/* run by non-root? */
if (opt_ler & (OPT_u|OPT_c))
bb_error_msg_and_die("only root can use -c or -u");
/* Clear dangerous stuff, set PATH */
sanitize_env_for_suid();
}
if (opt_ler & OPT_u) {
pas = getpwnam(user_name);
if (!pas)
bb_error_msg_and_die("user %s is not known", user_name);
my_uid = pas->pw_uid;
} else {
uid_t my_uid = getuid();
pas = getpwuid(my_uid);
if (!pas)
bb_perror_msg_and_die("no user record for UID %u",
@ -144,7 +140,6 @@ int crontab_main(int argc, char **argv)
}
#define user_name DONT_USE_ME_BEYOND_THIS_POINT
#define my_uid DONT_USE_ME_BEYOND_THIS_POINT
/* From now on, keep only -l, -e, -r bits */
opt_ler &= OPT_ler;

17
networking/nc.c
View File

@ -44,14 +44,17 @@ int nc_main(int argc, char **argv)
while ((opt = getopt(argc, argv,
"" USE_NC_SERVER("lp:") USE_NC_EXTRA("w:i:f:e:") )) > 0
) {
if (ENABLE_NC_SERVER && opt=='l') USE_NC_SERVER(do_listen++);
else if (ENABLE_NC_SERVER && opt=='p') {
if (ENABLE_NC_SERVER && opt=='l')
USE_NC_SERVER(do_listen++);
else if (ENABLE_NC_SERVER && opt=='p')
USE_NC_SERVER(lport = bb_lookup_port(optarg, "tcp", 0));
}
else if (ENABLE_NC_EXTRA && opt=='w') USE_NC_EXTRA( wsecs = xatou(optarg));
else if (ENABLE_NC_EXTRA && opt=='i') USE_NC_EXTRA( delay = xatou(optarg));
else if (ENABLE_NC_EXTRA && opt=='f') USE_NC_EXTRA( cfd = xopen(optarg, O_RDWR));
else if (ENABLE_NC_EXTRA && opt=='e' && optind<=argc) {
else if (ENABLE_NC_EXTRA && opt=='w')
USE_NC_EXTRA( wsecs = xatou(optarg));
else if (ENABLE_NC_EXTRA && opt=='i')
USE_NC_EXTRA( delay = xatou(optarg));
else if (ENABLE_NC_EXTRA && opt=='f')
USE_NC_EXTRA( cfd = xopen(optarg, O_RDWR));
else if (ENABLE_NC_EXTRA && opt=='e' && optind <= argc) {
/* We cannot just 'break'. We should let getopt finish.
** Or else we won't be able to find where
** 'host' and 'port' params are

9
util-linux/mount.c
View File

@ -33,6 +33,11 @@
#ifndef MS_SILENT
#define MS_SILENT (1 << 15)
#endif
/* Grab more as needed from util-linux's mount/mount_constants.h */
#ifndef MS_DIRSYNC
#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
#endif
#if defined(__dietlibc__)
/* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
@ -122,6 +127,7 @@ static const int32_t mount_options[] = {
/* "exec" */ ~MS_NOEXEC,
/* "noexec" */ MS_NOEXEC,
/* "sync" */ MS_SYNCHRONOUS,
/* "dirsync" */ MS_DIRSYNC,
/* "async" */ ~MS_SYNCHRONOUS,
/* "atime" */ ~MS_NOATIME,
/* "noatime" */ MS_NOATIME,
@ -171,6 +177,7 @@ static const char mount_option_str[] =
"exec" "\0"
"noexec" "\0"
"sync" "\0"
"dirsync" "\0"
"async" "\0"
"atime" "\0"
"noatime" "\0"
@ -1665,6 +1672,8 @@ int mount_main(int argc, char **argv)
SKIP_DESKTOP(const int nonroot = 0;)
USE_DESKTOP( int nonroot = (getuid() != 0);)
sanitize_env_if_suid();
/* parse long options, like --bind and --move. Note that -o option
* and --option are synonymous. Yes, this means --remount,rw works. */