95 lines
3 KiB
C
95 lines
3 KiB
C
--- sysdeps/freebsd/suid_open.c.orig 2009-12-13 13:47:12.739004000 -0500
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+++ sysdeps/freebsd/suid_open.c 2009-12-13 18:37:51.000000000 -0500
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@@ -0,0 +1,92 @@
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+/* Copyright (C) 1998 Joshua Sled
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+ This file is part of LibGTop 1.0.
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+
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+ Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.
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+
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+ LibGTop is free software; you can redistribute it and/or modify it
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+ under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2 of the License,
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+ or (at your option) any later version.
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+
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+ LibGTop is distributed in the hope that it will be useful, but WITHOUT
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+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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+ for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with LibGTop; see the file COPYING. If not, write to the
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+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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+ Boston, MA 02111-1307, USA.
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+*/
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+
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+#include <config.h>
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+#include <glibtop.h>
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+#include <glibtop/error.h>
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+#include <glibtop/cpu.h>
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+#include <glibtop/open.h>
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+#include <glibtop/init_hooks.h>
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+
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+
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+/* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
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+
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+void
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+glibtop_init_p (glibtop *server, const unsigned long features,
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+ const unsigned flags)
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+{
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+ const _glibtop_init_func_t *init_fkt;
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+
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+ if (server == NULL)
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+ glibtop_error_r (NULL, "glibtop_init_p (server == NULL)");
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+
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+ /* Do the initialization, but only if not already initialized. */
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+
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+ if ((server->flags & _GLIBTOP_INIT_STATE_SYSDEPS) == 0) {
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+ glibtop_open_p (server, "glibtop", features, flags);
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+
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+ for (init_fkt = _glibtop_init_hook_p; *init_fkt; init_fkt++)
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+ (*init_fkt) (server);
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+
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+ server->flags |= _GLIBTOP_INIT_STATE_SYSDEPS;
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+ }
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+}
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+
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+void
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+glibtop_open_p (glibtop *server, const char *program_name,
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+ const unsigned long features,
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+ const unsigned flags)
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+{
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+ char errbuf[_POSIX2_LINE_MAX];
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+#ifdef DEBUG
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+ fprintf (stderr, "DEBUG (%d): glibtop_open_p ()\n", getpid ());
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+#endif
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+
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+ /* !!! WE ARE ROOT HERE - CHANGE WITH CAUTION !!! */
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+ server->machine.uid = getuid ();
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+ server->machine.euid = geteuid ();
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+ server->machine.gid = getgid ();
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+ server->machine.egid = getegid ();
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+ /* Setup machine-specific data */
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+ server->machine.kd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, errbuf);
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+
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+ if (server->machine.kd == NULL)
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+ glibtop_error_io_r (server, "kvm_open");
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+
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+ /* Drop priviledges. */
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+
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+ if (setreuid (server->machine.euid, server->machine.uid))
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+ _exit (1);
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+
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+ if (setregid (server->machine.egid, server->machine.gid))
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+ _exit (1);
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+
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+ /* !!! END OF SUID ROOT PART !!! */
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+
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+ /* Our effective uid is now those of the user invoking the server,
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+ * so we do no longer have any priviledges. */
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+
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+ /* NOTE: On FreeBSD, we do not need to be suid root, we just need to
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+ * be sgid kmem.
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+ *
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+ * The server will only use setegid() to get back it's priviledges,
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+ * so it will fail if it is suid root and not sgid kmem. */
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+}
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