[Xen-devel] [PATCH 09/10] x86: check kexec relocation code fits in a page

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

The kexec relocation (control) code must fit in a single page so add a
link time check for this.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 xen/arch/x86/xen.lds.S |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index d959941..eebed01 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -186,3 +186,7 @@ SECTIONS
   .stab.indexstr 0 : { *(.stab.indexstr) }
   .comment 0 : { *(.comment) }
 }
+
+#ifdef CONFIG_KEXEC
+ASSERT(__kexec_reloc_size <= PAGE_SIZE, "kexec control code is too large")
+#endif
-- 
1.7.2.5


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