diff options
Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/client/linux/minidump_writer/linux_ptrace_dumper.cc')
| -rw-r--r-- | toolkit/crashreporter/google-breakpad/src/client/linux/minidump_writer/linux_ptrace_dumper.cc | 355 |
1 files changed, 0 insertions, 355 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/client/linux/minidump_writer/linux_ptrace_dumper.cc b/toolkit/crashreporter/google-breakpad/src/client/linux/minidump_writer/linux_ptrace_dumper.cc deleted file mode 100644 index c35e0e958..000000000 --- a/toolkit/crashreporter/google-breakpad/src/client/linux/minidump_writer/linux_ptrace_dumper.cc +++ /dev/null @@ -1,355 +0,0 @@ -// Copyright (c) 2012, Google Inc. -// All rights reserved. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// linux_ptrace_dumper.cc: Implement google_breakpad::LinuxPtraceDumper. -// See linux_ptrace_dumper.h for detals. -// This class was originally splitted from google_breakpad::LinuxDumper. - -// This code deals with the mechanics of getting information about a crashed -// process. Since this code may run in a compromised address space, the same -// rules apply as detailed at the top of minidump_writer.h: no libc calls and -// use the alternative allocator. - -#include "client/linux/minidump_writer/linux_ptrace_dumper.h" - -#include <asm/ptrace.h> -#include <assert.h> -#include <errno.h> -#include <fcntl.h> -#include <limits.h> -#include <stddef.h> -#include <stdlib.h> -#include <string.h> -#include <sys/ptrace.h> -#include <sys/uio.h> -#include <sys/wait.h> - -#if defined(__i386) -#include <cpuid.h> -#endif - -#include "client/linux/minidump_writer/directory_reader.h" -#include "client/linux/minidump_writer/line_reader.h" -#include "common/linux/linux_libc_support.h" -#include "third_party/lss/linux_syscall_support.h" - -// Suspends a thread by attaching to it. -static bool SuspendThread(pid_t pid) { - // This may fail if the thread has just died or debugged. - errno = 0; - if (sys_ptrace(PTRACE_ATTACH, pid, NULL, NULL) != 0 && - errno != 0) { - return false; - } - while (sys_waitpid(pid, NULL, __WALL) < 0) { - if (errno != EINTR) { - sys_ptrace(PTRACE_DETACH, pid, NULL, NULL); - return false; - } - } -#if defined(__i386) || defined(__x86_64) - // On x86, the stack pointer is NULL or -1, when executing trusted code in - // the seccomp sandbox. Not only does this cause difficulties down the line - // when trying to dump the thread's stack, it also results in the minidumps - // containing information about the trusted threads. This information is - // generally completely meaningless and just pollutes the minidumps. - // We thus test the stack pointer and exclude any threads that are part of - // the seccomp sandbox's trusted code. - user_regs_struct regs; - if (sys_ptrace(PTRACE_GETREGS, pid, NULL, ®s) == -1 || -#if defined(__i386) - !regs.esp -#elif defined(__x86_64) - !regs.rsp -#endif - ) { - sys_ptrace(PTRACE_DETACH, pid, NULL, NULL); - return false; - } -#endif - return true; -} - -// Resumes a thread by detaching from it. -static bool ResumeThread(pid_t pid) { - return sys_ptrace(PTRACE_DETACH, pid, NULL, NULL) >= 0; -} - -namespace google_breakpad { - -LinuxPtraceDumper::LinuxPtraceDumper(pid_t pid) - : LinuxDumper(pid), - threads_suspended_(false) { -} - -bool LinuxPtraceDumper::BuildProcPath(char* path, pid_t pid, - const char* node) const { - if (!path || !node || pid <= 0) - return false; - - size_t node_len = my_strlen(node); - if (node_len == 0) - return false; - - const unsigned pid_len = my_uint_len(pid); - const size_t total_length = 6 + pid_len + 1 + node_len; - if (total_length >= NAME_MAX) - return false; - - my_memcpy(path, "/proc/", 6); - my_uitos(path + 6, pid, pid_len); - path[6 + pid_len] = '/'; - my_memcpy(path + 6 + pid_len + 1, node, node_len); - path[total_length] = '\0'; - return true; -} - -bool LinuxPtraceDumper::CopyFromProcess(void* dest, pid_t child, - const void* src, size_t length) { - unsigned long tmp = 55; - size_t done = 0; - static const size_t word_size = sizeof(tmp); - uint8_t* const local = (uint8_t*) dest; - uint8_t* const remote = (uint8_t*) src; - - while (done < length) { - const size_t l = (length - done > word_size) ? word_size : (length - done); - if (sys_ptrace(PTRACE_PEEKDATA, child, remote + done, &tmp) == -1) { - tmp = 0; - } - my_memcpy(local + done, &tmp, l); - done += l; - } - return true; -} - -// Read thread info from /proc/$pid/status. -// Fill out the |tgid|, |ppid| and |pid| members of |info|. If unavailable, -// these members are set to -1. Returns true iff all three members are -// available. -bool LinuxPtraceDumper::GetThreadInfoByIndex(size_t index, ThreadInfo* info) { - if (index >= threads_.size()) - return false; - - pid_t tid = threads_[index]; - - assert(info != NULL); - char status_path[NAME_MAX]; - if (!BuildProcPath(status_path, tid, "status")) - return false; - - const int fd = sys_open(status_path, O_RDONLY, 0); - if (fd < 0) - return false; - - LineReader* const line_reader = new(allocator_) LineReader(fd); - const char* line; - unsigned line_len; - - info->ppid = info->tgid = -1; - - while (line_reader->GetNextLine(&line, &line_len)) { - if (my_strncmp("Tgid:\t", line, 6) == 0) { - my_strtoui(&info->tgid, line + 6); - } else if (my_strncmp("PPid:\t", line, 6) == 0) { - my_strtoui(&info->ppid, line + 6); - } - - line_reader->PopLine(line_len); - } - sys_close(fd); - - if (info->ppid == -1 || info->tgid == -1) - return false; - -#ifdef PTRACE_GETREGSET - struct iovec io; - info->GetGeneralPurposeRegisters(&io.iov_base, &io.iov_len); - if (sys_ptrace(PTRACE_GETREGSET, tid, (void*)NT_PRSTATUS, (void*)&io) == -1) { - return false; - } - - info->GetFloatingPointRegisters(&io.iov_base, &io.iov_len); - if (sys_ptrace(PTRACE_GETREGSET, tid, (void*)NT_FPREGSET, (void*)&io) == -1) { - return false; - } -#else // PTRACE_GETREGSET - void* gp_addr; - info->GetGeneralPurposeRegisters(&gp_addr, NULL); - if (sys_ptrace(PTRACE_GETREGS, tid, NULL, gp_addr) == -1) { - return false; - } - -#if !(defined(__ANDROID__) && defined(__ARM_EABI__)) - // When running an arm build on an arm64 device, attempting to get the - // floating point registers fails. On Android, the floating point registers - // aren't written to the cpu context anyway, so just don't get them here. - // See http://crbug.com/508324 - void* fp_addr; - info->GetFloatingPointRegisters(&fp_addr, NULL); - if (sys_ptrace(PTRACE_GETFPREGS, tid, NULL, fp_addr) == -1) { - return false; - } -#endif -#endif // PTRACE_GETREGSET - -#if defined(__i386) -#if !defined(bit_FXSAVE) // e.g. Clang -#define bit_FXSAVE bit_FXSR -#endif - // Detect if the CPU supports the FXSAVE/FXRSTOR instructions - int eax, ebx, ecx, edx; - __cpuid(1, eax, ebx, ecx, edx); - if (edx & bit_FXSAVE) { - if (sys_ptrace(PTRACE_GETFPXREGS, tid, NULL, &info->fpxregs) == -1) { - return false; - } - } else { - memset(&info->fpxregs, 0, sizeof(info->fpxregs)); - } -#endif // defined(__i386) - -#if defined(__i386) || defined(__x86_64) - for (unsigned i = 0; i < ThreadInfo::kNumDebugRegisters; ++i) { - if (sys_ptrace( - PTRACE_PEEKUSER, tid, - reinterpret_cast<void*> (offsetof(struct user, - u_debugreg[0]) + i * - sizeof(debugreg_t)), - &info->dregs[i]) == -1) { - return false; - } - } -#endif - -#if defined(__mips__) - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_BASE), &info->mcontext.hi1); - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_BASE + 1), &info->mcontext.lo1); - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_BASE + 2), &info->mcontext.hi2); - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_BASE + 3), &info->mcontext.lo2); - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_BASE + 4), &info->mcontext.hi3); - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_BASE + 5), &info->mcontext.lo3); - sys_ptrace(PTRACE_PEEKUSER, tid, - reinterpret_cast<void*>(DSP_CONTROL), &info->mcontext.dsp); -#endif - - const uint8_t* stack_pointer; -#if defined(__i386) - my_memcpy(&stack_pointer, &info->regs.esp, sizeof(info->regs.esp)); -#elif defined(__x86_64) - my_memcpy(&stack_pointer, &info->regs.rsp, sizeof(info->regs.rsp)); -#elif defined(__ARM_EABI__) - my_memcpy(&stack_pointer, &info->regs.ARM_sp, sizeof(info->regs.ARM_sp)); -#elif defined(__aarch64__) - my_memcpy(&stack_pointer, &info->regs.sp, sizeof(info->regs.sp)); -#elif defined(__mips__) - stack_pointer = - reinterpret_cast<uint8_t*>(info->mcontext.gregs[MD_CONTEXT_MIPS_REG_SP]); -#else -#error "This code hasn't been ported to your platform yet." -#endif - info->stack_pointer = reinterpret_cast<uintptr_t>(stack_pointer); - - return true; -} - -bool LinuxPtraceDumper::IsPostMortem() const { - return false; -} - -bool LinuxPtraceDumper::ThreadsSuspend() { - if (threads_suspended_) - return true; - for (size_t i = 0; i < threads_.size(); ++i) { - if (!SuspendThread(threads_[i])) { - // If the thread either disappeared before we could attach to it, or if - // it was part of the seccomp sandbox's trusted code, it is OK to - // silently drop it from the minidump. - if (i < threads_.size() - 1) { - my_memmove(&threads_[i], &threads_[i + 1], - (threads_.size() - i - 1) * sizeof(threads_[i])); - } - threads_.resize(threads_.size() - 1); - --i; - } - } - threads_suspended_ = true; - return threads_.size() > 0; -} - -bool LinuxPtraceDumper::ThreadsResume() { - if (!threads_suspended_) - return false; - bool good = true; - for (size_t i = 0; i < threads_.size(); ++i) - good &= ResumeThread(threads_[i]); - threads_suspended_ = false; - return good; -} - -// Parse /proc/$pid/task to list all the threads of the process identified by -// pid. -bool LinuxPtraceDumper::EnumerateThreads() { - char task_path[NAME_MAX]; - if (!BuildProcPath(task_path, pid_, "task")) - return false; - - const int fd = sys_open(task_path, O_RDONLY | O_DIRECTORY, 0); - if (fd < 0) - return false; - DirectoryReader* dir_reader = new(allocator_) DirectoryReader(fd); - - // The directory may contain duplicate entries which we filter by assuming - // that they are consecutive. - int last_tid = -1; - const char* dent_name; - while (dir_reader->GetNextEntry(&dent_name)) { - if (my_strcmp(dent_name, ".") && - my_strcmp(dent_name, "..")) { - int tid = 0; - if (my_strtoui(&tid, dent_name) && - last_tid != tid) { - last_tid = tid; - threads_.push_back(tid); - } - } - dir_reader->PopEntry(); - } - - sys_close(fd); - return true; -} - -} // namespace google_breakpad |