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Stack protector

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This commit is contained in:
Thomas Oltmann 2025-03-16 00:38:18 +01:00
parent 0960df714d
commit 3c732f27db
3 changed files with 21 additions and 3 deletions
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1
Makefile
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@ -18,6 +18,7 @@ VISOR_SOURCES_x86_64 := \
VISOR_SOURCES := \
src/alloc.c \
src/efi.c \
src/ssp.c \
src/strlcpy.c \
$(VISOR_SOURCES_$(ARCH)) \
# end of sources list

6
config.default.mk
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@ -5,11 +5,11 @@ ARCH = x86_64
CROSS_PATH = /usr/bin
# C Compiler & Linker commands
CC = gcc
LD = ld
CC = $(CROSS_PATH)/$(ARCH)-linux-gcc
LD = $(CROSS_PATH)/$(ARCH)-linux-ld
# Compilation flags
CFLAGS = -std=c17 -Wall -ffreestanding -fpic -nostdlib -fno-stack-protector -fno-stack-check -fshort-wchar -mno-red-zone -maccumulate-outgoing-args -mno-sse -mno-mmx -mno-80387
CFLAGS = -std=c17 -Wall -ffreestanding -fpic -nostdlib -fstack-protector-all -fshort-wchar -mno-red-zone -maccumulate-outgoing-args -mno-sse -mno-mmx -mno-80387
CPPFLAGS = -Ignuefi/inc -Iinclude
LDFLAGS = -shared -Bsymbolic -Lgnuefi -Tgnuefi/elf_$(ARCH)_efi.lds -nostdlib
LIBS = -lgnuefi -lefi

17
src/ssp.c Normal file
View file

@ -0,0 +1,17 @@
#include <stdint.h>
#include <efi.h>
#include <efilib.h>
#define STACK_CHK_GUARD 0x595e9fbd94fda766
uintptr_t __stack_chk_guard = STACK_CHK_GUARD;
_Noreturn void
__stack_chk_fail(void)
{
Print(L"stack smashing detected");
for (;;) {
__asm__ ("cli\n\thlt\n\t" ::);
}
}