From 0054cbd4dbb9315419cc3c3b2aa1754a02fff1f4 Mon Sep 17 00:00:00 2001 From: Kenny Root Date: Fri, 12 Oct 2012 14:58:28 -0700 Subject: Add interrupter library to simulate EINTR To check for robustness against EINTR from syscalls, add an interrupter library that can be preloaded with LD_PRELOAD. Change-Id: I0a6cd8702ec5bc6b2927a5e223ee3cdc033860a2 --- cmds/interrupter/Android.mk | 21 +++++++++++ cmds/interrupter/interrupter.c | 53 ++++++++++++++++++++++++++++ cmds/interrupter/interrupter.h | 79 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 cmds/interrupter/Android.mk create mode 100644 cmds/interrupter/interrupter.c create mode 100644 cmds/interrupter/interrupter.h (limited to 'cmds/interrupter') diff --git a/cmds/interrupter/Android.mk b/cmds/interrupter/Android.mk new file mode 100644 index 0000000..e324627 --- /dev/null +++ b/cmds/interrupter/Android.mk @@ -0,0 +1,21 @@ +LOCAL_PATH := $(call my-dir) + +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := \ + interrupter.c +LOCAL_MODULE := interrupter +LOCAL_MODULE_TAGS := eng tests +LOCAL_LDFLAGS := -ldl + +include $(BUILD_SHARED_LIBRARY) + +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := \ + interrupter.c +LOCAL_MODULE := interrupter +LOCAL_MODULE_TAGS := eng tests +LOCAL_LDFLAGS := -ldl + +include $(BUILD_HOST_SHARED_LIBRARY) \ No newline at end of file diff --git a/cmds/interrupter/interrupter.c b/cmds/interrupter/interrupter.c new file mode 100644 index 0000000..ae55515 --- /dev/null +++ b/cmds/interrupter/interrupter.c @@ -0,0 +1,53 @@ +/* + * Copyright 2012, The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + + +/** + * The probability of a syscall failing from 0.0 to 1.0 + */ +#define PROBABILITY 0.9 + + + +#include +#include +#include + +/* for various intercepted calls */ +#include +#include +#include +#include + +/* For builds on glibc */ +#define __USE_GNU +#include + +#include "interrupter.h" + +static int probability = PROBABILITY * RAND_MAX; + +static int maybe_interrupt() { + if (rand() < probability) { + return 1; + } + return 0; +} + +DEFINE_INTERCEPT(read, ssize_t, int, void*, size_t); +DEFINE_INTERCEPT(write, ssize_t, int, const void*, size_t); +DEFINE_INTERCEPT(accept, int, int, struct sockaddr*, socklen_t*); +DEFINE_INTERCEPT(creat, int, const char*, mode_t); diff --git a/cmds/interrupter/interrupter.h b/cmds/interrupter/interrupter.h new file mode 100644 index 0000000..9ad0277 --- /dev/null +++ b/cmds/interrupter/interrupter.h @@ -0,0 +1,79 @@ +/* + * Copyright 2012, The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define CONCATENATE(arg1, arg2) CONCATENATE1(arg1, arg2) +#define CONCATENATE1(arg1, arg2) CONCATENATE2(arg1, arg2) +#define CONCATENATE2(arg1, arg2) arg1##arg2 + +#define INTERRUPTER(sym) \ + if (real_##sym == NULL) \ + __init_##sym(); \ + if (maybe_interrupt()) { \ + errno = EINTR; \ + return -1; \ + } + +#define CALL_FUNCTION_1(sym, ret, type1) \ +ret (*real_##sym)(type1) = NULL; \ +ret sym(type1 arg1) { \ + INTERRUPTER(sym) \ + return real_##sym(arg1); \ +} + +#define CALL_FUNCTION_2(sym, ret, type1, type2) \ +ret (*real_##sym)(type1, type2) = NULL; \ +ret sym(type1 arg1, type2 arg2) { \ + INTERRUPTER(sym) \ + return real_##sym(arg1, arg2); \ +} + +#define CALL_FUNCTION_3(sym, ret, type1, type2, type3) \ +ret (*real_##sym)(type1, type2, type3) = NULL; \ +ret sym(type1 arg1, type2 arg2, type3 arg3) { \ + INTERRUPTER(sym) \ + return real_##sym(arg1, arg2, arg3); \ +} + +#define CALL_FUNCTION_4(sym, ret, type1, type2, type3, type4) \ +ret (*real_##sym)(type1, type2, type3, type4) = NULL; \ +ret sym(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \ + INTERRUPTER(sym) \ + return real_##sym(arg1, arg2, arg3, arg4); \ +} + +#define CALL_FUNCTION_5(sym, ret, type1, type2, type3, type4, type5) \ +ret (*real_##sym)(type1, type2, type3, type4, type5) = NULL; \ +ret sym(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) { \ + INTERRUPTER(sym) \ + return real_##sym(arg1, arg2, arg3, arg4, arg5); \ +} + +#define DEFINE_INTERCEPT_N(N, sym, ret, ...) \ +static void __init_##sym(void); \ +CONCATENATE(CALL_FUNCTION_, N)(sym, ret, __VA_ARGS__) \ +static void __init_##sym(void) { \ + real_##sym = dlsym(RTLD_NEXT, #sym); \ + if (real_##sym == NULL) { \ + fprintf(stderr, "Error hooking " #sym ": %s\n", dlerror()); \ + } \ +} + +#define INTERCEPT_NARG(...) INTERCEPT_NARG_N(__VA_ARGS__, INTERCEPT_RSEQ_N()) +#define INTERCEPT_NARG_N(...) INTERCEPT_ARG_N(__VA_ARGS__) +#define INTERCEPT_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) N +#define INTERCEPT_RSEQ_N() 8, 7, 6, 5, 4, 3, 2, 1, 0 + +#define DEFINE_INTERCEPT(sym, ret, ...) DEFINE_INTERCEPT_N(INTERCEPT_NARG(__VA_ARGS__), sym, ret, __VA_ARGS__) -- cgit v1.1