#endif
#include <stdlib.h>
#include <stdio.h>
+#include <sys/types.h>
+#include <errno.h>
#ifdef HAVE_SYS_PRIV_H
#include <sys/priv.h>
void restore_re_uid(void)
{
set_effective_uid(0);
+
+#if USE_SETRESUID
+ setresuid(saved_ruid, saved_euid, -1);
+#elif USE_SETREUID
+ setreuid(saved_ruid, -1);
+ setreuid(-1,saved_euid);
+#elif USE_SETUIDX
+ setuidx(ID_REAL, saved_ruid);
+ setuidx(ID_EFFECTIVE, saved_euid);
+#else
set_effective_uid(saved_euid);
- if (getuid() != saved_ruid) setuid(saved_ruid);
+ if (getuid() != saved_ruid)
+ setuid(saved_ruid);
set_effective_uid(saved_euid);
+#endif
assert_uid(saved_ruid, saved_euid);
}
assert_gid(gid, gid);
}
+
+/****************************************************************************
+this function just checks that we don't get ENOSYS back
+****************************************************************************/
+static int have_syscall(void)
+{
+ errno = 0;
+
+#if USE_SETRESUID
+ setresuid(-1,-1,-1);
+#endif
+
+#if USE_SETREUID
+ setreuid(-1,-1);
+#endif
+
+#if USE_SETEUID
+ seteuid(-1);
+#endif
+
+#if USE_SETUIDX
+ setuidx(ID_EFFECTIVE, -1);
+#endif
+
+ if (errno == ENOSYS) return -1;
+
+ return 0;
+}
+
#ifdef AUTOCONF_TEST
main()
{
exit(1);
#endif
- /* assume that if we have the functions then they work */
- fprintf(stderr,"not running as root: assuming OK\n");
- exit(0);
+ /* if not running as root then at least check to see if we get ENOSYS - this
+ handles Linux 2.0.x with glibc 2.1 */
+ fprintf(stderr,"not running as root: checking for ENOSYS\n");
+ exit(have_syscall());
}
gain_root_privilege();
gain_root_group_privilege();
set_effective_gid(1);
set_effective_uid(1);
+ save_re_uid();
+ restore_re_uid();
gain_root_privilege();
gain_root_group_privilege();
become_user_permanently(1, 1);