linux-kernel - [PATCH 25/29] xtensa: Move EXCEPTION_TABLE to RO

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Message-Id: <20190926175602.33098-26-keescook@chromium.org>
Date:   Thu, 26 Sep 2019 10:55:58 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-alpha@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-c6x-dev@...ux-c6x.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Michal Simek <monstr@...str.eu>, linux-parisc@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 25/29] xtensa: Move EXCEPTION_TABLE to RO_DATA segment

The EXCEPTION_TABLE is read-only, so collapse it into RO_DATA.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/xtensa/kernel/vmlinux.lds.S | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index bdbd7c4056c1..7341964722ae 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -14,6 +14,8 @@
  * Joe Taylor <joe@...silica.com, joetylr@...oo.com>
  */
 
+#define RO_DATA_EXCEPTION_TABLE_ALIGN	16
+
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/page.h>
 #include <asm/thread_info.h>
@@ -130,7 +132,6 @@ SECTIONS
 
   .fixup   : { *(.fixup) }
 
-  EXCEPTION_TABLE(16)
   /* Data section */
 
   _sdata = .;
-- 
2.17.1