Changing the priority of a program Post: 11996

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Top Forums Programming Changing the priority of a program Post 11996 by Perderabo on Sunday 16th of December 2001 12:32:57 PM

12-16-2001

Administrator Emeritus

Adding a negative increment to a process's nice value requires that the process have an effective uid of root. Is this program running suid to root? When bash starts up in that state, it will abandon the root power unless -p has been specified. Other modern shells will also have features to resist running scripts while suid'ed. My guess is that this happened to you.

Does /usr/local/bin/vmod4dSOUND need root power? If it can run as an ordinary user, pick one, let's say it's uid 4. Now write a program like:

Code:

int main(int argc, char *argv[])
{
      nice(-20);
      setuid(4);
      execl("/usr/local/bin/vmod4dSOUND", "vmod4dSOUND", NULL);
}

And call this, perhaps, runvmod4dSOUND. It must be owned by root and have the setuid bit on:
chown root runvmod4SOUND
chmod 4755 runvmod4SOUND

Now you have a program that can run your sound and it is already setuid to root. So now the invoking program can be an ordinary user.

And when you invoke it, just do...
system("/usr/local/bin/runvmod4dSOUND");

You don't need to copy the string into an array the way you are doing.

Perderabo

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LEARN ABOUT FREEBSD

krb5_appdefault_time

KRB5_APPDEFAULT(3)					   BSD Library Functions Manual 					KRB5_APPDEFAULT(3)

NAME

     krb5_appdefault_boolean, krb5_appdefault_string, krb5_appdefault_time -- get application configuration value

LIBRARY

     Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

     #include <krb5.h>

     void
     krb5_appdefault_boolean(krb5_context context, const char *appname, krb5_realm realm, const char *option, krb5_boolean def_val,
	 krb5_boolean *ret_val);

     void
     krb5_appdefault_string(krb5_context context, const char *appname, krb5_realm realm, const char *option, const char *def_val, char **ret_val);

     void
     krb5_appdefault_time(krb5_context context, const char *appname, krb5_realm realm, const char *option, time_t def_val, time_t *ret_val);

DESCRIPTION

     These functions get application defaults from the appdefaults section of the krb5.conf(5) configuration file. These defaults can be specified
     per application, and/or per realm.

     These values will be looked for in krb5.conf(5), in order of descending importance.

	   [appdefaults]
		   appname = {
			   realm = {
				   option = value
			   }
		   }
		   appname = {
			   option = value
		   }
		   realm = {
			   option = value
		   }
		   option = value
     appname is the name of the application, and realm is the realm name. If the realm is omitted it will not be used for resolving values.
     def_val is the value to return if no value is found in krb5.conf(5).

SEE ALSO

     krb5_config(3), krb5.conf(5)

HEIMDAL 
							   July 25, 2000							   HEIMDAL

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