linux-kernel - [PATCH] Revert "module: Add retpoline tag to VERMAGIC"

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Date:   Wed, 24 Jan 2018 15:28:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jiri Kosina <jikos@...nel.org>, torvalds@...ux-foundation.org
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>, rusty@...tcorp.com.au,
        arjan.van.de.ven@...el.com, jeyu@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Revert "module: Add retpoline tag to VERMAGIC"

This reverts commit 6cfb521ac0d5b97470883ff9b7facae264b7ab12.

Turns out distros do not want to make retpoline as part of their "ABI",
so this patch should not have been merged.  Sorry Andi, this was my
fault, I suggested it when your original patch was the "correct" way of
doing this instead.

Reported-by: Jiri Kosina <jikos@...nel.org>
Fixes: 6cfb521ac0d5 ("module: Add retpoline tag to VERMAGIC")
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: rusty@...tcorp.com.au
Cc: arjan.van.de.ven@...el.com
Cc: jeyu@...nel.org
Cc: torvalds@...ux-foundation.org
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---

Linus, if there are no objections, can you apply this revert to your
tree now so this doesn't get into 4.15?  It's already in the stable
releases but Jiri pointed out he instantly reverted it for SuSE's
kernels as it does not do what they want it to do.  They want to just
taint the kernel, not prevent modules from being loaded entirely.

 include/linux/vermagic.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/linux/vermagic.h b/include/linux/vermagic.h
index 853291714ae0..bae807eb2933 100644
--- a/include/linux/vermagic.h
+++ b/include/linux/vermagic.h
@@ -31,17 +31,11 @@
 #else
 #define MODULE_RANDSTRUCT_PLUGIN
 #endif
-#ifdef RETPOLINE
-#define MODULE_VERMAGIC_RETPOLINE "retpoline "
-#else
-#define MODULE_VERMAGIC_RETPOLINE ""
-#endif
 
 #define VERMAGIC_STRING 						\
 	UTS_RELEASE " "							\
 	MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT 			\
 	MODULE_VERMAGIC_MODULE_UNLOAD MODULE_VERMAGIC_MODVERSIONS	\
 	MODULE_ARCH_VERMAGIC						\
-	MODULE_RANDSTRUCT_PLUGIN					\
-	MODULE_VERMAGIC_RETPOLINE
+	MODULE_RANDSTRUCT_PLUGIN
 
-- 
2.16.1