linux-kernel - [PATCH 5/7] powerpc: Don't fortify prom

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Date:   Mon, 19 Jun 2017 13:26:25 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>, Daniel Axtens <dja@...ens.net>,
        Daniel Micay <danielmicay@...il.com>,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [PATCH 5/7] powerpc: Don't fortify prom_init

From: Daniel Axtens <dja@...ens.net>

prom_init is a bit special; in theory it should be able to be
linked separately to the kernel. To keep this from getting too
complex, the symbols that prom_init.c uses are checked.

Fortification adds symbols, and it gets quite messy as it includes
things like panic(). So just don't fortify prom_init.c for now.

Cc: Kees Cook <keescook@...omium.org>
Cc: Daniel Micay <danielmicay@...il.com>
Signed-off-by: Daniel Axtens <dja@...ens.net>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/powerpc/kernel/prom_init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index dd8a04f3053a..613f79f03877 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -15,6 +15,9 @@
 
 #undef DEBUG_PROM
 
+/* we cannot use FORTIFY as it brings in new symbols */
+#define __NO_FORTIFY
+
 #include <stdarg.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
-- 
2.7.4