linux-kernel - [RFC PATCH liburing v1 3/3] src/Makefile: Allow using stack protector with libc

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Date:   Fri, 23 Jun 2023 00:20:29 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>,
        Guillem Jover <guillem@...rons.org>,
        Jeff Moyer <jmoyer@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Michael William Jonathan <moe@...weeb.org>,
        Matthew Patrick <ThePhoenix576@...weeb.org>,
        io-uring Mailing List <io-uring@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>
Subject: [RFC PATCH liburing v1 3/3] src/Makefile: Allow using stack protector with libc

Currently, the stack protector is forcefully disabled. Let's allow using
the stack protector feature only if libc is used.

The stack protector will remain disabled by default if no custom CFLAGS
are provided. This ensures the default behavior doesn't change while
still offering the option to enable the stack protector.

Cc: Stefan Hajnoczi <stefanha@...hat.com>
Cc: Guillem Jover <guillem@...rons.org>
Co-authored-by: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Signed-off-by: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
---
 src/Makefile | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index 951c48fc6797be75..c4c28cbe87c7a8de 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -10,9 +10,8 @@ CPPFLAGS ?=
 override CPPFLAGS += -D_GNU_SOURCE \
 	-Iinclude/ -include ../config-host.h \
 	-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-CFLAGS ?= -g -O3 -Wall -Wextra
+CFLAGS ?= -g -O3 -Wall -Wextra -fno-stack-protector
 override CFLAGS += -Wno-unused-parameter \
-	-fno-stack-protector \
 	-DLIBURING_INTERNAL \
 	$(LIBURING_CFLAGS)
 SO_CFLAGS=-fPIC $(CFLAGS)
@@ -46,8 +45,8 @@ liburing_srcs := setup.c queue.c register.c syscall.c version.c
 
 ifeq ($(CONFIG_NOLIBC),y)
 	liburing_srcs += nolibc.c
-	override CFLAGS += -nostdlib -nodefaultlibs -ffreestanding -fno-builtin
-	override CPPFLAGS += -nostdlib -nodefaultlibs -ffreestanding -fno-builtin
+	override CFLAGS += -nostdlib -nodefaultlibs -ffreestanding -fno-builtin -fno-stack-protector
+	override CPPFLAGS += -nostdlib -nodefaultlibs -ffreestanding -fno-builtin -fno-stack-protector
 	override LINK_FLAGS += -nostdlib -nodefaultlibs
 endif
 
-- 
Ammar Faizi