linux-kernel - [PATCH v3 02/14] x86/stackprotector/64: Remove stack protector test script

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Message-ID: <20231115173708.108316-3-brgerst@gmail.com>
Date:   Wed, 15 Nov 2023 12:36:56 -0500
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Uros Bizjak <ubizjak@...il.com>, David.Laight@...lab.com,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH v3 02/14] x86/stackprotector/64: Remove stack protector test script

This test for the stack protector was added in 2006 to make sure the
compiler had the PR28281 patch applied.  With GCC 5.1 being the minimum
supported compiler now, it is no longer necessary.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/Kconfig                          | 5 ++---
 scripts/gcc-x86_64-has-stack-protector.sh | 4 ----
 2 files changed, 2 insertions(+), 7 deletions(-)
 delete mode 100755 scripts/gcc-x86_64-has-stack-protector.sh

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 46c55fd7ca86..a1d2f7fe42bb 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -410,12 +410,11 @@ config PGTABLE_LEVELS
 
 config CC_HAS_SANE_STACKPROTECTOR
 	bool
-	default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC) $(CLANG_FLAGS)) if 64BIT
+	default y if 64BIT
 	default $(cc-option,-mstack-protector-guard-reg=fs -mstack-protector-guard-symbol=__stack_chk_guard)
 	help
 	  We have to make sure stack protector is unconditionally disabled if
-	  the compiler produces broken code or if it does not let us control
-	  the segment on 32-bit kernels.
+	  the compiler does not allow control of the segment and symbol.
 
 menu "Processor type and features"
 
diff --git a/scripts/gcc-x86_64-has-stack-protector.sh b/scripts/gcc-x86_64-has-stack-protector.sh
deleted file mode 100755
index 75e4e22b986a..000000000000
--- a/scripts/gcc-x86_64-has-stack-protector.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-
-echo "int foo(void) { char X[200]; return 3; }" | $* -S -x c -c -m64 -O0 -mcmodel=kernel -fno-PIE -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
-- 
2.41.0