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tools/nolibc: x86_64: add stackprotector support

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Enable the new stackprotector support for x86_64.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Thomas Weißschuh 2023-03-25 16:45:16 +01:00 committed by Paul E. McKenney
parent ff221a6d9a
commit 0d8c461adb
2 changed files with 7 additions and 0 deletions
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5
tools/include/nolibc/arch-x86_64.h
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@ -181,6 +181,8 @@ struct sys_stat_struct {
char **environ __attribute__((weak));
const unsigned long *_auxv __attribute__((weak));
#define __ARCH_SUPPORTS_STACK_PROTECTOR
/* startup code */
/*
* x86-64 System V ABI mandates:
@ -191,6 +193,9 @@ const unsigned long *_auxv __attribute__((weak));
void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
{
__asm__ volatile (
#ifdef NOLIBC_STACKPROTECTOR
"call __stack_chk_init\n" // initialize stack protector
#endif
"pop %rdi\n" // argc (first arg, %rdi)
"mov %rsp, %rsi\n" // argv[] (second arg, %rsi)
"lea 8(%rsi,%rdi,8),%rdx\n" // then a NULL then envp (third arg, %rdx)

2
tools/testing/selftests/nolibc/Makefile
View File

@ -80,6 +80,8 @@ CFLAGS_STACKPROTECTOR = -DNOLIBC_STACKPROTECTOR \
$(call cc-option,-mstack-protector-guard=global) \
$(call cc-option,-fstack-protector-all)
CFLAGS_STKP_i386 = $(CFLAGS_STACKPROTECTOR)
CFLAGS_STKP_x86_64 = $(CFLAGS_STACKPROTECTOR)
CFLAGS_STKP_x86 = $(CFLAGS_STACKPROTECTOR)
CFLAGS_s390 = -m64
CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables \
$(call cc-option,-fno-stack-protector) \