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Implement Stack Smashing Protection

This commit is contained in:
Bananymous 2022-11-12 23:45:26 +02:00
parent 7ad8189e24
commit db656fe469
2 changed files with 20 additions and 1 deletions
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3
kernel/Makefile
View File

@ -13,7 +13,7 @@ EXEC_PREFIX?=$(PREFIX)
BOOTDIR?=$(EXEC_PREFIX)/boot BOOTDIR?=$(EXEC_PREFIX)/boot
INCLUDEDIR?=$(PREFIX)/include INCLUDEDIR?=$(PREFIX)/include
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra CFLAGS:=$(CFLAGS) -fstack-protector -ffreestanding -Wall -Wextra
CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
LDFLAGS:=$(LDFLAGS) LDFLAGS:=$(LDFLAGS)
LIBS:=$(LIBS) -nostdlib -lk -lgcc LIBS:=$(LIBS) -nostdlib -lk -lgcc
@ -30,6 +30,7 @@ LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS)
KERNEL_OBJS=\ KERNEL_OBJS=\
$(KERNEL_ARCH_OBJS) \ $(KERNEL_ARCH_OBJS) \
kernel/kernel.o \ kernel/kernel.o \
kernel/ssp.o \
OBJS=\ OBJS=\
$(ARCHDIR)/crti.o \ $(ARCHDIR)/crti.o \

18
kernel/kernel/ssp.c Normal file
View File

@ -0,0 +1,18 @@
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#if UINT32_MAX == UINTPTR_MAX
#define STACK_CHK_GUARD 0xe2dee396
#else
#define STACK_CHK_GUARD 0x595e9fbd94fda766
#endif
uintptr_t __stack_chk_guard = STACK_CHK_GUARD;
__attribute__((noreturn))
void __stack_chk_fail(void)
{
printf("Stack smashing detected\n");
abort();
}