1781d105ed
Summary: ShadowCallStack does not yet have a runtime provided by compiler-rt, but this change includes simple tests that make use of a very minimal runtime in test/shadowcallstack/minimal_runtime.h Reviewers: pcc, kcc, delcypher, eugenis, filcab Reviewed By: pcc Subscribers: kubamracek, mgorny, delcypher, llvm-commits, #sanitizers, kcc Differential Revision: https://reviews.llvm.org/D44803 llvm-svn: 329210
27 lines
725 B
C
27 lines
725 B
C
// A shadow call stack runtime is not yet included with compiler-rt, provide a
|
|
// minimal runtime to allocate a shadow call stack and assign %gs to point at
|
|
// it.
|
|
|
|
#pragma once
|
|
|
|
#include <asm/prctl.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/prctl.h>
|
|
|
|
int arch_prctl(int code, void *addr);
|
|
|
|
__attribute__((no_sanitize("shadow-call-stack")))
|
|
static void __shadowcallstack_init() {
|
|
void *stack = mmap(NULL, 8192, PROT_READ | PROT_WRITE,
|
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|
if (stack == MAP_FAILED)
|
|
abort();
|
|
|
|
if (arch_prctl(ARCH_SET_GS, stack))
|
|
abort();
|
|
}
|
|
|
|
__attribute__((section(".preinit_array"), used))
|
|
void (*__shadowcallstack_preinit)(void) = __shadowcallstack_init;
|