[Xen-changelog] [xen-unstable] xl: poison data objects in auto-generated destructors

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
# Date 1282320720 -3600
# Node ID f77261710856aad506dda92cfa3b92b923be4e15
# Parent  f68726cdf357f8948700a56e96d4c10e3131bce2
xl: poison data objects in auto-generated destructors

Increase the probability of blowing up badly up during any
use-after-destroy scenarios.

Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/gentypes.py |    4 ++++
 1 files changed, 4 insertions(+)

diff -r f68726cdf357 -r f77261710856 tools/libxl/gentypes.py
--- a/tools/libxl/gentypes.py   Thu Aug 19 18:24:12 2010 +0100
+++ b/tools/libxl/gentypes.py   Fri Aug 20 17:12:00 2010 +0100
@@ -145,8 +145,11 @@ if __name__ == '__main__':
 
 #include <stdint.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "libxl.h"
+
+#define LIBXL_DTOR_POISON 0xa5
 
 """ % " ".join(sys.argv))
 
@@ -154,6 +157,7 @@ if __name__ == '__main__':
         f.write("void %s(%s *p)\n" % (ty.destructor_fn, ty.typename))
         f.write("{\n")
         f.write(libxl_C_type_destroy(ty, "p", True))
+        f.write("\tmemset(p, LIBXL_DTOR_POISON, sizeof(*p));\n")
         f.write("}\n")
         f.write("\n")
     f.close()

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