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Kernel+LibC: Build with basic -fstack-protector support

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Use simple stack cookies to try to provoke an assertion failure on
stack overflow.

This is far from perfect, since we use a constant cookie instead of
generating a random one on startup, but it can still help us catch
bugs, which is the primary concern right now. :^)
This commit is contained in:
Andreas Kling 2019-12-20 20:51:50 +01:00
parent f006e66a25
commit 842716a0b5
3 changed files with 18 additions and 1 deletions
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8
Kernel/StdLib.cpp
View file

@ -183,4 +183,12 @@ void free(void* p)
{
return kfree(p);
}
extern u32 __stack_chk_guard;
u32 __stack_chk_guard = (u32)0xc0000c13;
[[noreturn]] void __stack_chk_fail()
{
ASSERT_NOT_REACHED();
}
}

9
Libraries/LibC/crt0.cpp
View file

@ -1,3 +1,4 @@
#include <AK/Types.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
@ -51,4 +52,12 @@ int _start(int argc, char** argv, char** env)
void __cxa_atexit()
{
}
extern u32 __stack_chk_guard;
u32 __stack_chk_guard = (u32)0xc0000c13;
[[noreturn]] void __stack_chk_fail()
{
ASSERT_NOT_REACHED();
}
}

2
Makefile.common
View file

@ -1,7 +1,7 @@
ARCH_FLAGS =
STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation -fno-sized-deallocation
WARNING_FLAGS = -Werror -Wextra -Wall -Wno-nonnull-compare -Wno-deprecated-copy -Wno-address-of-packed-member -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough -Wno-expansion-to-defined
FLAVOR_FLAGS = -fno-exceptions -fno-rtti
FLAVOR_FLAGS = -fno-exceptions -fno-rtti -fstack-protector
OPTIMIZATION_FLAGS = -Os
MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))