x86: harden kernel code patching

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-25 17:07:03 +02:00
parent b7b66baa8b
commit 00c6b2d5d7
1 changed files with 1 additions and 0 deletions
--- 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]);