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125 lines
3.3 KiB
125 lines
3.3 KiB
4 months ago
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//===-- safestack_platform.h ----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements platform specific parts of SafeStack runtime.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SAFESTACK_PLATFORM_H
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#define SAFESTACK_PLATFORM_H
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#include "safestack_util.h"
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#include "sanitizer_common/sanitizer_platform.h"
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#include <dlfcn.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if !(SANITIZER_NETBSD || SANITIZER_FREEBSD || SANITIZER_LINUX)
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#error "Support for your platform has not been implemented"
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#endif
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#if SANITIZER_NETBSD
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#include <lwp.h>
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extern "C" void *__mmap(void *, size_t, int, int, int, int, off_t);
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#endif
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#if SANITIZER_FREEBSD
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#include <sys/thr.h>
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#endif
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namespace safestack {
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#if SANITIZER_NETBSD
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static void *GetRealLibcAddress(const char *symbol) {
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void *real = dlsym(RTLD_NEXT, symbol);
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if (!real)
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real = dlsym(RTLD_DEFAULT, symbol);
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if (!real) {
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fprintf(stderr, "safestack GetRealLibcAddress failed for symbol=%s",
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symbol);
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abort();
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}
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return real;
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}
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#define _REAL(func, ...) real##_##func(__VA_ARGS__)
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#define DEFINE__REAL(ret_type, func, ...) \
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static ret_type (*real_##func)(__VA_ARGS__) = NULL; \
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if (!real_##func) { \
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real_##func = (ret_type(*)(__VA_ARGS__))GetRealLibcAddress(#func); \
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} \
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SFS_CHECK(real_##func);
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#endif
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using ThreadId = uint64_t;
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inline ThreadId GetTid() {
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#if SANITIZER_NETBSD
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DEFINE__REAL(int, _lwp_self);
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return _REAL(_lwp_self);
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#elif SANITIZER_FREEBSD
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long Tid;
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thr_self(&Tid);
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return Tid;
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#else
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return syscall(SYS_gettid);
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#endif
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}
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inline int TgKill(pid_t pid, ThreadId tid, int sig) {
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#if SANITIZER_NETBSD
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DEFINE__REAL(int, _lwp_kill, int a, int b);
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(void)pid;
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return _REAL(_lwp_kill, tid, sig);
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#elif SANITIZER_FREEBSD
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return syscall(SYS_thr_kill2, pid, tid, sig);
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#else
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return syscall(SYS_tgkill, pid, tid, sig);
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#endif
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}
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inline void *Mmap(void *addr, size_t length, int prot, int flags, int fd,
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off_t offset) {
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#if SANITIZER_NETBSD
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return __mmap(addr, length, prot, flags, fd, 0, offset);
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#elif defined(__x86_64__) && (SANITIZER_FREEBSD)
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return (void *)__syscall(SYS_mmap, addr, length, prot, flags, fd, offset);
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#else
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return (void *)syscall(SYS_mmap, addr, length, prot, flags, fd, offset);
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#endif
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}
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inline int Munmap(void *addr, size_t length) {
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#if SANITIZER_NETBSD
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DEFINE__REAL(int, munmap, void *a, size_t b);
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return _REAL(munmap, addr, length);
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#else
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return syscall(SYS_munmap, addr, length);
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#endif
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}
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inline int Mprotect(void *addr, size_t length, int prot) {
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#if SANITIZER_NETBSD
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DEFINE__REAL(int, mprotect, void *a, size_t b, int c);
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return _REAL(mprotect, addr, length, prot);
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#else
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return syscall(SYS_mprotect, addr, length, prot);
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#endif
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}
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} // namespace safestack
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#endif // SAFESTACK_PLATFORM_H
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