From 861c2f286ff7e68cbe93f7bc8e43b60638f52848 Mon Sep 17 00:00:00 2001
From: dsmith <dsmith>
Date: Wed, 20 Jun 2007 18:00:39 +0000
Subject: 2007-06-20  David Smith  <dsmith@redhat.com>

	* buildrun.cxx (compile_pass): Unset environment variables that
	could interfere with building the kernel module.  Fixes PR 4664.
	* main.cxx (main): Unsets a few standard environment variables for
	safety.
---
 buildrun.cxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'buildrun.cxx')

diff --git a/buildrun.cxx b/buildrun.cxx
index 13aa9da7..2e6d18d7 100644
--- a/buildrun.cxx
+++ b/buildrun.cxx
@@ -93,6 +93,18 @@ compile_pass (systemtap_session& s)
 	return rc;
     }  
 
+  // Before running make, fix up the environment a bit.  PATH should
+  // already be overridden.  Clean out a few variables that
+  // /lib/modules/${KVER}/build/Makefile uses.
+  rc = unsetenv("ARCH") || unsetenv("KBUILD_EXTMOD")
+      || unsetenv("CROSS_COMPILE") || unsetenv("KBUILD_IMAGE")
+      || unsetenv("KCONFIG_CONFIG") || unsetenv("INSTALL_PATH");
+  if (rc)
+    {
+      const char* e = strerror (errno);
+      cerr << "unsetenv failed: " << e << endl;
+    }
+
   // Run make
   string make_cmd = string("make")
     + string (" -C \"") + module_dir + string("\"");
-- 
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