x86: harden kernel code patching

Signed-off-by: Ingo Molnar <mingo@elte.hu>
git-mirror · Apr 25, 2008 · 00c6b2d · 00c6b2d
1 parent b7b66ba
commit 00c6b2d
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
@@ -519,6 +519,7 @@ void *__kprobes text_poke(void *addr, const void *opcode, size_t len)
 		pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
 	} else {
 		pages[0] = virt_to_page(addr);
+		WARN_ON(!PageReserved(pages[0]));
 		pages[1] = virt_to_page(addr + PAGE_SIZE);
 	}
 	BUG_ON(!pages[0]);