linux-kernel - [tip: x86/entry] x86/entry: Exclude low level entry code from sanitizing

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Date:   Tue, 19 May 2020 19:58:48 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/entry] x86/entry: Exclude low level entry code from sanitizing

The following commit has been merged into the x86/entry branch of tip:

Commit-ID:     d13c070160256152bbc5d2072d39a339846fa5b7
Gitweb:        https://git.kernel.org/tip/d13c070160256152bbc5d2072d39a339846fa5b7
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Thu, 05 Mar 2020 14:01:25 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Fri, 15 May 2020 20:03:05 +02:00

x86/entry: Exclude low level entry code from sanitizing

The sanitizers are not really applicable to the fragile low level entry
code. Entry code needs to carefully setup a normal 'runtime' environment.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Link: https://lkml.kernel.org/r/20200505134059.970057117@linutronix.de

---
 arch/x86/entry/Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/entry/Makefile b/arch/x86/entry/Makefile
index 85eb381..cdf45ff 100644
--- a/arch/x86/entry/Makefile
+++ b/arch/x86/entry/Makefile
@@ -3,6 +3,14 @@
 # Makefile for the x86 low level entry code
 #
 
+KASAN_SANITIZE := n
+UBSAN_SANITIZE := n
+KCOV_INSTRUMENT := n
+
+CFLAGS_REMOVE_common.o = $(CC_FLAGS_FTRACE) -fstack-protector -fstack-protector-strong
+CFLAGS_REMOVE_syscall_32.o = $(CC_FLAGS_FTRACE) -fstack-protector -fstack-protector-strong
+CFLAGS_REMOVE_syscall_64.o = $(CC_FLAGS_FTRACE) -fstack-protector -fstack-protector-strong
+
 OBJECT_FILES_NON_STANDARD_entry_64_compat.o := y
 
 CFLAGS_syscall_64.o		+= $(call cc-option,-Wno-override-init,)