linux-kernel - [PATCH v2 nolibc 20/53] tools/nolibc: aarch64: add stackprotector support

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Message-Id: <20230612204514.292087-20-paulmck@kernel.org>
Date:   Mon, 12 Jun 2023 13:44:41 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     gwml@...r.gnuweeb.org, kernel-team@...a.com, w@....eu,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Willy Tarreau <w@....eu>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v2 nolibc 20/53] tools/nolibc: aarch64: add stackprotector support

From: Thomas Weißschuh <linux@...ssschuh.net>

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/arch-aarch64.h     | 7 ++++++-
 tools/testing/selftests/nolibc/Makefile | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/include/nolibc/arch-aarch64.h b/tools/include/nolibc/arch-aarch64.h
index 76ef26520c85..6a859131c530 100644
--- a/tools/include/nolibc/arch-aarch64.h
+++ b/tools/include/nolibc/arch-aarch64.h
@@ -172,10 +172,15 @@ struct sys_stat_struct {
 char **environ __attribute__((weak));
 const unsigned long *_auxv __attribute__((weak));
 
+#define __ARCH_SUPPORTS_STACK_PROTECTOR
+
 /* startup code */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_protector)) _start(void)
 {
 	__asm__ volatile (
+#ifdef NOLIBC_STACKPROTECTOR
+		"bl __stack_chk_init\n"   /* initialize stack protector                     */
+#endif
 		"ldr x0, [sp]\n"     /* argc (x0) was in the stack                          */
 		"add x1, sp, 8\n"    /* argv (x1) = sp                                      */
 		"lsl x2, x0, 3\n"    /* envp (x2) = 8*argc ...                              */
diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 423d22f353a0..fa0075479a26 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -82,6 +82,7 @@ CFLAGS_STACKPROTECTOR = -DNOLIBC_STACKPROTECTOR \
 CFLAGS_STKP_i386 = $(CFLAGS_STACKPROTECTOR)
 CFLAGS_STKP_x86_64 = $(CFLAGS_STACKPROTECTOR)
 CFLAGS_STKP_x86 = $(CFLAGS_STACKPROTECTOR)
+CFLAGS_STKP_arm64 = $(CFLAGS_STACKPROTECTOR)
 CFLAGS_s390 = -m64
 CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 \
 		$(call cc-option,-fno-stack-protector) \
-- 
2.40.1