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authorCarlos O'Donell <carlos@redhat.com>2013-09-23 00:52:09 -0400
committerCarlos O'Donell <carlos@redhat.com>2013-09-23 00:52:09 -0400
commitc61b4d41c9647a54a329aa021341c0eb032b793e (patch)
treec4a665c232a7d37786a6f3b5e3f56d0ae11480e8 /sysdeps/x86_64/stackguard-macros.h
parent58a96064d193317236b740998e134b652d3d62ad (diff)
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BZ #15754: CVE-2013-4788
The pointer guard used for pointer mangling was not initialized for
static applications resulting in the security feature being disabled.
The pointer guard is now correctly initialized to a random value for
static applications. Existing static applications need to be
recompiled to take advantage of the fix.

The test tst-ptrguard1-static and tst-ptrguard1 add regression
coverage to ensure the pointer guards are sufficiently random
and initialized to a default value.
Diffstat (limited to 'sysdeps/x86_64/stackguard-macros.h')
-rw-r--r--sysdeps/x86_64/stackguard-macros.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/x86_64/stackguard-macros.h b/sysdeps/x86_64/stackguard-macros.h
index d7fedb3737..1948800cd0 100644
--- a/sysdeps/x86_64/stackguard-macros.h
+++ b/sysdeps/x86_64/stackguard-macros.h
@@ -4,3 +4,8 @@
   ({ uintptr_t x;						\
      asm ("mov %%fs:%c1, %0" : "=r" (x)				\
 	  : "i" (offsetof (tcbhead_t, stack_guard))); x; })
+
+#define POINTER_CHK_GUARD \
+  ({ uintptr_t x;						\
+     asm ("mov %%fs:%c1, %0" : "=r" (x)				\
+	  : "i" (offsetof (tcbhead_t, pointer_guard))); x; })