linux-kernel - Re: [PATCH v2 3/6] x86/cpu: Remove CONFIG_X86

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Date:   Tue, 8 Feb 2022 22:01:05 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH v2 3/6] x86/cpu: Remove CONFIG_X86_SMAP and "nosmap"

On Tue, Feb 08, 2022 at 04:06:52PM +0100, Borislav Petkov wrote:
> Hmm, I think you're right.
> 
> Mr. Z?

He says yes.

Ok, that was a good catch, thanks!

This chunk looks now like this - I'll send a new version later.

---
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a4b89b757287..404ea669ecca 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -233,7 +233,7 @@ objtool_args =								\
 	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
 	$(if $(CONFIG_GCOV_KERNEL)$(CONFIG_LTO_CLANG), --no-unreachable)\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
-	$(if $(CONFIG_X86_SMAP), --uaccess)				\
+	--uaccess							\
 	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
 	$(if $(CONFIG_SLS), --sls)
 
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 666f7bbc13eb..0fcba46fc10f 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -106,7 +106,7 @@ modpost_link()
 objtool_link()
 {
 	local objtoolcmd;
-	local objtoolopt;
+	local objtoolopt="--uaccess"
 
 	if is_enabled CONFIG_LTO_CLANG && is_enabled CONFIG_STACK_VALIDATION; then
 		# Don't perform vmlinux validation unless explicitly requested,
@@ -140,9 +140,6 @@ objtool_link()
 		if is_enabled CONFIG_RETPOLINE; then
 			objtoolopt="${objtoolopt} --retpoline"
 		fi
-		if is_enabled CONFIG_X86_SMAP; then
-			objtoolopt="${objtoolopt} --uaccess"
-		fi
 		if is_enabled CONFIG_SLS; then
 			objtoolopt="${objtoolopt} --sls"
 		fi

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette