From 00c6b2d5d7b2414bd46c620d6a8c37fa7a716f29 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Fri, 25 Apr 2008 17:07:03 +0200 Subject: [PATCH] x86: harden kernel code patching Signed-off-by: Ingo Molnar --- arch/x86/kernel/alternative.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 60299f61843f..65c7857a90dd 100644 --- 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]); -- 2.20.1