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-rw-r--r--include/libbb.h4
-rw-r--r--libbb/login.c11
-rw-r--r--loginutils/login.c9
-rw-r--r--loginutils/sulogin.c2
-rw-r--r--miscutils/crontab.c11
-rw-r--r--networking/nc.c17
-rw-r--r--util-linux/mount.c9
7 files changed, 37 insertions, 26 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 2af89df..a91eac4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -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;
diff --git a/libbb/login.c b/libbb/login.c
index 1af3165..d1f5d64 100644
--- a/libbb/login.c
+++ b/libbb/login.c
@@ -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! */
}
diff --git a/loginutils/login.c b/loginutils/login.c
index 55cbfa7..a5b6369 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -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) {
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
index faa93ea..3a1a8e9 100644
--- a/loginutils/sulogin.c
+++ b/loginutils/sulogin.c
@@ -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);
diff --git a/miscutils/crontab.c b/miscutils/crontab.c
index bc7f56a..6b68964 100644
--- a/miscutils/crontab.c
+++ b/miscutils/crontab.c
@@ -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;
diff --git a/networking/nc.c b/networking/nc.c
index feb9c5d..7c2aafa 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -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
diff --git a/util-linux/mount.c b/util-linux/mount.c
index dd75323..054db57 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -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. */
generated by cgit v1.1 at 2024-12-26 07:12:01 +0000