linux-kernel - [PATCH AUTOSEL for 4.9 009/281] x86/boot: Declare error() as noreturn

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Message-ID: <20180319155742.13731-9-alexander.levin@microsoft.com>
Date:   Mon, 19 Mar 2018 15:58:00 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Kees Cook <keescook@...omium.org>,
        Daniel Micay <danielmicay@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 009/281] x86/boot: Declare error() as noreturn

From: Kees Cook <keescook@...omium.org>

[ Upstream commit 60854a12d281e2fa25662fa32ac8022bbff17432 ]

The compressed boot function error() is used to halt execution, but it
wasn't marked with "noreturn". This fixes that in preparation for
supporting kernel FORTIFY_SOURCE, which uses the noreturn annotation
on panic, and calls error(). GCC would warn about a noreturn function
calling a non-noreturn function:

  arch/x86/boot/compressed/misc.c: In function ‘fortify_panic’:
  arch/x86/boot/compressed/misc.c:416:1: warning: ‘noreturn’ function does return
   }
 ^

Signed-off-by: Kees Cook <keescook@...omium.org>
Cc: Daniel Micay <danielmicay@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: H. Peter Anvin <hpa@...or.com>
Link: http://lkml.kernel.org/r/20170506045116.GA2879@beast
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 arch/x86/boot/compressed/error.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/error.h b/arch/x86/boot/compressed/error.h
index 2e59dac07f9e..d732e608e3af 100644
--- a/arch/x86/boot/compressed/error.h
+++ b/arch/x86/boot/compressed/error.h
@@ -1,7 +1,9 @@
 #ifndef BOOT_COMPRESSED_ERROR_H
 #define BOOT_COMPRESSED_ERROR_H
 
+#include <linux/compiler.h>
+
 void warn(char *m);
-void error(char *m);
+void error(char *m) __noreturn;
 
 #endif /* BOOT_COMPRESSED_ERROR_H */
-- 
2.14.1