x86: harden kernel code patching

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 0 deletions

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]);