2019-08-14 10:47:11 +02:00
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//===-- sanitizer_unwind_linux_libcdep.cpp --------------------------------===//
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2014-09-23 19:59:53 +02:00
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//
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2019-08-14 10:47:11 +02:00
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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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2014-09-23 19:59:53 +02:00
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the unwind.h-based (aka "slow") stack unwinding routines
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2018-10-31 12:14:23 +01:00
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// available to the tools on Linux, Android, NetBSD, FreeBSD, and Solaris.
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2014-09-23 19:59:53 +02:00
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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2018-10-31 12:14:23 +01:00
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#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
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SANITIZER_SOLARIS
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2014-09-23 19:59:53 +02:00
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#include "sanitizer_common.h"
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#include "sanitizer_stacktrace.h"
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#if SANITIZER_ANDROID
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#include <dlfcn.h> // for dlopen()
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#endif
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#if SANITIZER_FREEBSD
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#define _GNU_SOURCE // to declare _Unwind_Backtrace() from <unwind.h>
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#endif
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#include <unwind.h>
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namespace __sanitizer {
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2019-11-05 14:54:57 +01:00
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namespace {
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2019-08-14 10:47:11 +02:00
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//---------------------------- UnwindSlow --------------------------------------
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2014-09-23 19:59:53 +02:00
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typedef struct {
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uptr absolute_pc;
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uptr stack_top;
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uptr stack_size;
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} backtrace_frame_t;
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extern "C" {
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typedef void *(*acquire_my_map_info_list_func)();
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typedef void (*release_my_map_info_list_func)(void *map);
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typedef sptr (*unwind_backtrace_signal_arch_func)(
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void *siginfo, void *sigcontext, void *map_info_list,
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backtrace_frame_t *backtrace, uptr ignore_depth, uptr max_depth);
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acquire_my_map_info_list_func acquire_my_map_info_list;
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release_my_map_info_list_func release_my_map_info_list;
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unwind_backtrace_signal_arch_func unwind_backtrace_signal_arch;
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} // extern "C"
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ubsan.c (ubsan_expand_null_ifn): Use _v1 suffixed type mismatch builtins...
* ubsan.c (ubsan_expand_null_ifn): Use _v1 suffixed type mismatch
builtins, store max (log2 (align), 0) into uchar field instead of
align into uptr field.
(ubsan_expand_objsize_ifn): Use _v1 suffixed type mismatch builtins,
store uchar 0 field instead of uptr 0 field.
(instrument_nonnull_return): Use _v1 suffixed nonnull return builtin,
instead of passing one address of struct with 2 locations pass
two addresses of structs with 1 location each.
* sanitizer.def (BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH,
BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_ABORT,
BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN,
BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN_ABORT): Removed.
(BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_V1,
BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_V1_ABORT,
BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN_V1,
BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN_V1_ABORT): New builtins.
* c-c++-common/ubsan/float-cast-overflow-1.c: Drop value keyword
from expected output regexps.
* c-c++-common/ubsan/float-cast-overflow-2.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-3.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-4.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-5.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-6.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-8.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-9.c: Likewise.
* c-c++-common/ubsan/float-cast-overflow-10.c: Likewise.
* g++.dg/ubsan/float-cast-overflow-bf.C: Likewise.
* gcc.dg/ubsan/float-cast-overflow-bf.c: Likewise.
* g++.dg/asan/default-options-1.C (__asan_default_options): Add
used attribute.
* g++.dg/asan/asan_test.C: Run with ASAN_OPTIONS=handle_segv=2
in the environment.
* All source files: Merge from upstream 315899.
* asan/Makefile.am (nodist_saninclude_HEADERS): Add
include/sanitizer/tsan_interface.h.
* asan/libtool-version: Bump the libasan SONAME.
* lsan/Makefile.am (sanitizer_lsan_files): Add lsan_common_mac.cc.
(lsan_files): Add lsan_linux.cc, lsan_mac.cc and lsan_malloc_mac.cc.
* sanitizer_common/Makefile.am (sanitizer_common_files): Add
sancov_flags.cc, sanitizer_allocator_checks.cc,
sanitizer_coverage_libcdep_new.cc, sanitizer_errno.cc,
sanitizer_file.cc, sanitizer_mac_libcdep.cc and
sanitizer_stoptheworld_mac.cc. Remove sanitizer_coverage_libcdep.cc
and sanitizer_coverage_mapping_libcdep.cc.
* tsan/Makefile.am (tsan_files): Add tsan_external.cc.
* ubsan/Makefile.am (DEFS): Add -DUBSAN_CAN_USE_CXXABI=1.
(ubsan_files): Add ubsan_init_standalone.cc and
ubsan_signals_standalone.cc.
* ubsan/libtool-version: Bump the libubsan SONAME.
* asan/Makefile.in: Regenerate.
* lsan/Makefile.in: Regenerate.
* sanitizer_common/Makefile.in: Regenerate.
* tsan/Makefile.in: Regenerate.
* ubsan/Makefile.in: Regenerate.
From-SVN: r253887
2017-10-19 13:23:59 +02:00
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#if defined(__arm__) && !SANITIZER_NETBSD
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// NetBSD uses dwarf EH
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2014-09-23 19:59:53 +02:00
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#define UNWIND_STOP _URC_END_OF_STACK
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#define UNWIND_CONTINUE _URC_NO_REASON
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#else
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#define UNWIND_STOP _URC_NORMAL_STOP
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#define UNWIND_CONTINUE _URC_NO_REASON
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#endif
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uptr Unwind_GetIP(struct _Unwind_Context *ctx) {
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2015-10-21 09:32:45 +02:00
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#if defined(__arm__) && !SANITIZER_MAC
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2014-09-23 19:59:53 +02:00
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uptr val;
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_Unwind_VRS_Result res = _Unwind_VRS_Get(ctx, _UVRSC_CORE,
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15 /* r15 = PC */, _UVRSD_UINT32, &val);
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CHECK(res == _UVRSR_OK && "_Unwind_VRS_Get failed");
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// Clear the Thumb bit.
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return val & ~(uptr)1;
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#else
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2019-08-14 10:47:11 +02:00
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return (uptr)_Unwind_GetIP(ctx);
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2014-09-23 19:59:53 +02:00
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#endif
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}
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struct UnwindTraceArg {
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2014-11-13 21:41:38 +01:00
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BufferedStackTrace *stack;
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2015-10-21 09:32:45 +02:00
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u32 max_depth;
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2014-09-23 19:59:53 +02:00
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};
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_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
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UnwindTraceArg *arg = (UnwindTraceArg*)param;
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CHECK_LT(arg->stack->size, arg->max_depth);
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uptr pc = Unwind_GetIP(ctx);
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2016-11-08 23:04:09 +01:00
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const uptr kPageSize = GetPageSizeCached();
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// Let's assume that any pointer in the 0th page (i.e. <0x1000 on i386 and
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// x86_64) is invalid and stop unwinding here. If we're adding support for
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// a platform where this isn't true, we need to reconsider this check.
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if (pc < kPageSize) return UNWIND_STOP;
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2014-11-13 21:41:38 +01:00
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arg->stack->trace_buffer[arg->stack->size++] = pc;
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2014-09-23 19:59:53 +02:00
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if (arg->stack->size == arg->max_depth) return UNWIND_STOP;
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return UNWIND_CONTINUE;
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}
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2019-11-05 14:54:57 +01:00
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} // namespace
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#if SANITIZER_ANDROID
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void SanitizerInitializeUnwinder() {
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if (AndroidGetApiLevel() >= ANDROID_LOLLIPOP_MR1) return;
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// Pre-lollipop Android can not unwind through signal handler frames with
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// libgcc unwinder, but it has a libcorkscrew.so library with the necessary
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// workarounds.
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void *p = dlopen("libcorkscrew.so", RTLD_LAZY);
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if (!p) {
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VReport(1,
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"Failed to open libcorkscrew.so. You may see broken stack traces "
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"in SEGV reports.");
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return;
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}
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acquire_my_map_info_list =
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(acquire_my_map_info_list_func)(uptr)dlsym(p, "acquire_my_map_info_list");
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release_my_map_info_list =
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(release_my_map_info_list_func)(uptr)dlsym(p, "release_my_map_info_list");
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unwind_backtrace_signal_arch = (unwind_backtrace_signal_arch_func)(uptr)dlsym(
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p, "unwind_backtrace_signal_arch");
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if (!acquire_my_map_info_list || !release_my_map_info_list ||
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!unwind_backtrace_signal_arch) {
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VReport(1,
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"Failed to find one of the required symbols in libcorkscrew.so. "
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"You may see broken stack traces in SEGV reports.");
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acquire_my_map_info_list = 0;
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unwind_backtrace_signal_arch = 0;
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release_my_map_info_list = 0;
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}
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}
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#endif
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2019-08-14 10:47:11 +02:00
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void BufferedStackTrace::UnwindSlow(uptr pc, u32 max_depth) {
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2014-09-23 19:59:53 +02:00
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CHECK_GE(max_depth, 2);
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size = 0;
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UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
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_Unwind_Backtrace(Unwind_Trace, &arg);
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// We need to pop a few frames so that pc is on top.
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uptr to_pop = LocatePcInTrace(pc);
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2015-10-21 09:32:45 +02:00
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// trace_buffer[0] belongs to the current function so we always pop it,
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// unless there is only 1 frame in the stack trace (1 frame is always better
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// than 0!).
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// 1-frame stacks don't normally happen, but this depends on the actual
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// unwinder implementation (libgcc, libunwind, etc) which is outside of our
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// control.
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2014-11-13 21:41:38 +01:00
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if (to_pop == 0 && size > 1)
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2014-09-23 19:59:53 +02:00
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to_pop = 1;
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PopStackFrames(to_pop);
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2019-03-13 10:05:43 +01:00
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#if defined(__GNUC__) && defined(__sparc__)
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// __builtin_return_address returns the address of the call instruction
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// on the SPARC and not the return address, so we need to compensate.
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trace_buffer[0] = GetNextInstructionPc(pc);
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#else
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2014-11-13 21:41:38 +01:00
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trace_buffer[0] = pc;
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2019-03-13 10:05:43 +01:00
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#endif
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2014-09-23 19:59:53 +02:00
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}
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2019-08-14 10:47:11 +02:00
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void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {
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CHECK(context);
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2014-09-23 19:59:53 +02:00
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CHECK_GE(max_depth, 2);
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if (!unwind_backtrace_signal_arch) {
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2019-08-14 10:47:11 +02:00
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UnwindSlow(pc, max_depth);
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2014-09-23 19:59:53 +02:00
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return;
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}
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void *map = acquire_my_map_info_list();
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CHECK(map);
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2018-10-31 12:14:23 +01:00
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InternalMmapVector<backtrace_frame_t> frames(kStackTraceMax);
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2014-09-23 19:59:53 +02:00
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// siginfo argument appears to be unused.
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sptr res = unwind_backtrace_signal_arch(/* siginfo */ 0, context, map,
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frames.data(),
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/* ignore_depth */ 0, max_depth);
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release_my_map_info_list(map);
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if (res < 0) return;
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CHECK_LE((uptr)res, kStackTraceMax);
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size = 0;
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// +2 compensate for libcorkscrew unwinder returning addresses of call
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// instructions instead of raw return addresses.
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for (sptr i = 0; i < res; ++i)
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2014-11-13 21:41:38 +01:00
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trace_buffer[size++] = frames[i].absolute_pc + 2;
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2014-09-23 19:59:53 +02:00
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}
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} // namespace __sanitizer
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2018-10-31 12:14:23 +01:00
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#endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD ||
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// SANITIZER_SOLARIS
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