Patch "x86/boot: Declare error() as noreturn" has been added to the 4.9-stable tree

Patch "x86/boot: Declare error() as noreturn" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    x86/boot: Declare error() as noreturn

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-boot-declare-error-as-noreturn.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Kees Cook <keescook@chromium.org>
Date: Fri, 5 May 2017 21:51:16 -0700
Subject: x86/boot: Declare error() as noreturn

From: Kees Cook <keescook@chromium.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@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/20170506045116.GA2879@beast
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/boot/compressed/error.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 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 */


Patches currently in stable-queue which might be from keescook@chromium.org are

queue-4.9/qlge-avoid-reading-past-end-of-buffer.patch
queue-4.9/pidns-disable-pid-allocation-if-pid_ns_prepare_proc-is-failed-in-alloc_pid.patch
queue-4.9/x86-mm-kaslr-use-the-_asm_mul-macro-for-multiplication-to-work-around-clang-incompatibility.patch
queue-4.9/ray_cs-avoid-reading-past-end-of-buffer.patch
queue-4.9/x86-boot-declare-error-as-noreturn.patch
queue-4.9/selftests-kselftest_harness-fix-compile-warning.patch
queue-4.9/bna-avoid-reading-past-end-of-buffer.patch