1308 lines
44 KiB
C++
1308 lines
44 KiB
C++
// Copyright (c) 2010, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This code writes out minidump files:
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// http://msdn.microsoft.com/en-us/library/ms680378(VS.85,loband).aspx
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//
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// Minidumps are a Microsoft format which Breakpad uses for recording crash
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// dumps. This code has to run in a compromised environment (the address space
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// may have received SIGSEGV), thus the following rules apply:
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// * You may not enter the dynamic linker. This means that we cannot call
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// any symbols in a shared library (inc libc). Because of this we replace
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// libc functions in linux_libc_support.h.
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// * You may not call syscalls via the libc wrappers. This rule is a subset
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// of the first rule but it bears repeating. We have direct wrappers
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// around the system calls in linux_syscall_support.h.
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// * You may not malloc. There's an alternative allocator in memory.h and
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// a canonical instance in the LinuxDumper object. We use the placement
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// new form to allocate objects and we don't delete them.
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#include "client/linux/minidump_writer/minidump_writer.h"
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#include "client/minidump_file_writer-inl.h"
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#include <errno.h>
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#include <fcntl.h>
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#if !defined(__ANDROID__)
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#include <link.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#if !defined(__ANDROID__)
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#include <sys/ucontext.h>
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#include <sys/user.h>
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#endif
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#include <sys/utsname.h>
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#include <algorithm>
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#include "client/minidump_file_writer.h"
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#include "google_breakpad/common/minidump_format.h"
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#include "google_breakpad/common/minidump_cpu_amd64.h"
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#include "google_breakpad/common/minidump_cpu_x86.h"
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#if defined(__ANDROID__)
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#include "client/linux/android_link.h"
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#include "client/linux/android_ucontext.h"
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#endif
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#include "client/linux/handler/exception_handler.h"
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#include "client/linux/minidump_writer/line_reader.h"
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#include "client/linux/minidump_writer/linux_dumper.h"
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#include "client/linux/minidump_writer/minidump_extension_linux.h"
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#include "common/linux/linux_libc_support.h"
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#include "third_party/lss/linux_syscall_support.h"
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// Minidump defines register structures which are different from the raw
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// structures which we get from the kernel. These are platform specific
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// functions to juggle the ucontext and user structures into minidump format.
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#if defined(__i386)
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typedef MDRawContextX86 RawContextCPU;
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// Write a uint16_t to memory
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// out: memory location to write to
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// v: value to write.
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static void U16(void* out, uint16_t v) {
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memcpy(out, &v, sizeof(v));
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}
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// Write a uint32_t to memory
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// out: memory location to write to
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// v: value to write.
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static void U32(void* out, uint32_t v) {
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memcpy(out, &v, sizeof(v));
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}
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// Juggle an x86 user_(fp|fpx|)regs_struct into minidump format
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// out: the minidump structure
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// info: the collection of register structures.
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static void CPUFillFromThreadInfo(MDRawContextX86 *out,
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const google_breakpad::ThreadInfo &info) {
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out->context_flags = MD_CONTEXT_X86_ALL;
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out->dr0 = info.dregs[0];
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out->dr1 = info.dregs[1];
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out->dr2 = info.dregs[2];
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out->dr3 = info.dregs[3];
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// 4 and 5 deliberatly omitted because they aren't included in the minidump
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// format.
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out->dr6 = info.dregs[6];
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out->dr7 = info.dregs[7];
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out->gs = info.regs.xgs;
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out->fs = info.regs.xfs;
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out->es = info.regs.xes;
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out->ds = info.regs.xds;
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out->edi = info.regs.edi;
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out->esi = info.regs.esi;
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out->ebx = info.regs.ebx;
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out->edx = info.regs.edx;
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out->ecx = info.regs.ecx;
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out->eax = info.regs.eax;
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out->ebp = info.regs.ebp;
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out->eip = info.regs.eip;
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out->cs = info.regs.xcs;
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out->eflags = info.regs.eflags;
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out->esp = info.regs.esp;
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out->ss = info.regs.xss;
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out->float_save.control_word = info.fpregs.cwd;
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out->float_save.status_word = info.fpregs.swd;
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out->float_save.tag_word = info.fpregs.twd;
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out->float_save.error_offset = info.fpregs.fip;
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out->float_save.error_selector = info.fpregs.fcs;
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out->float_save.data_offset = info.fpregs.foo;
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out->float_save.data_selector = info.fpregs.fos;
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// 8 registers * 10 bytes per register.
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memcpy(out->float_save.register_area, info.fpregs.st_space, 10 * 8);
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// This matches the Intel fpsave format.
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U16(out->extended_registers + 0, info.fpregs.cwd);
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U16(out->extended_registers + 2, info.fpregs.swd);
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U16(out->extended_registers + 4, info.fpregs.twd);
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U16(out->extended_registers + 6, info.fpxregs.fop);
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U32(out->extended_registers + 8, info.fpxregs.fip);
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U16(out->extended_registers + 12, info.fpxregs.fcs);
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U32(out->extended_registers + 16, info.fpregs.foo);
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U16(out->extended_registers + 20, info.fpregs.fos);
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U32(out->extended_registers + 24, info.fpxregs.mxcsr);
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memcpy(out->extended_registers + 32, &info.fpxregs.st_space, 128);
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memcpy(out->extended_registers + 160, &info.fpxregs.xmm_space, 128);
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}
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// Juggle an x86 ucontext into minidump format
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// out: the minidump structure
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// info: the collection of register structures.
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static void CPUFillFromUContext(MDRawContextX86 *out, const ucontext *uc,
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const struct _libc_fpstate* fp) {
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const greg_t* regs = uc->uc_mcontext.gregs;
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out->context_flags = MD_CONTEXT_X86_FULL |
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MD_CONTEXT_X86_FLOATING_POINT;
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out->gs = regs[REG_GS];
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out->fs = regs[REG_FS];
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out->es = regs[REG_ES];
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out->ds = regs[REG_DS];
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out->edi = regs[REG_EDI];
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out->esi = regs[REG_ESI];
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out->ebx = regs[REG_EBX];
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out->edx = regs[REG_EDX];
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out->ecx = regs[REG_ECX];
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out->eax = regs[REG_EAX];
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out->ebp = regs[REG_EBP];
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out->eip = regs[REG_EIP];
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out->cs = regs[REG_CS];
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out->eflags = regs[REG_EFL];
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out->esp = regs[REG_UESP];
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out->ss = regs[REG_SS];
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out->float_save.control_word = fp->cw;
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out->float_save.status_word = fp->sw;
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out->float_save.tag_word = fp->tag;
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out->float_save.error_offset = fp->ipoff;
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out->float_save.error_selector = fp->cssel;
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out->float_save.data_offset = fp->dataoff;
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out->float_save.data_selector = fp->datasel;
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// 8 registers * 10 bytes per register.
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memcpy(out->float_save.register_area, fp->_st, 10 * 8);
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}
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#elif defined(__x86_64)
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typedef MDRawContextAMD64 RawContextCPU;
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static void CPUFillFromThreadInfo(MDRawContextAMD64 *out,
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const google_breakpad::ThreadInfo &info) {
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out->context_flags = MD_CONTEXT_AMD64_FULL |
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MD_CONTEXT_AMD64_SEGMENTS;
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out->cs = info.regs.cs;
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out->ds = info.regs.ds;
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out->es = info.regs.es;
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out->fs = info.regs.fs;
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out->gs = info.regs.gs;
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out->ss = info.regs.ss;
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out->eflags = info.regs.eflags;
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out->dr0 = info.dregs[0];
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out->dr1 = info.dregs[1];
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out->dr2 = info.dregs[2];
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out->dr3 = info.dregs[3];
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// 4 and 5 deliberatly omitted because they aren't included in the minidump
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// format.
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out->dr6 = info.dregs[6];
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out->dr7 = info.dregs[7];
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out->rax = info.regs.rax;
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out->rcx = info.regs.rcx;
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out->rdx = info.regs.rdx;
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out->rbx = info.regs.rbx;
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out->rsp = info.regs.rsp;
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out->rbp = info.regs.rbp;
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out->rsi = info.regs.rsi;
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out->rdi = info.regs.rdi;
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out->r8 = info.regs.r8;
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out->r9 = info.regs.r9;
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out->r10 = info.regs.r10;
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out->r11 = info.regs.r11;
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out->r12 = info.regs.r12;
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out->r13 = info.regs.r13;
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out->r14 = info.regs.r14;
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out->r15 = info.regs.r15;
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out->rip = info.regs.rip;
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out->flt_save.control_word = info.fpregs.cwd;
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out->flt_save.status_word = info.fpregs.swd;
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out->flt_save.tag_word = info.fpregs.ftw;
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out->flt_save.error_opcode = info.fpregs.fop;
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out->flt_save.error_offset = info.fpregs.rip;
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out->flt_save.error_selector = 0; // We don't have this.
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out->flt_save.data_offset = info.fpregs.rdp;
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out->flt_save.data_selector = 0; // We don't have this.
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out->flt_save.mx_csr = info.fpregs.mxcsr;
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out->flt_save.mx_csr_mask = info.fpregs.mxcr_mask;
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memcpy(&out->flt_save.float_registers, &info.fpregs.st_space, 8 * 16);
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memcpy(&out->flt_save.xmm_registers, &info.fpregs.xmm_space, 16 * 16);
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}
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static void CPUFillFromUContext(MDRawContextAMD64 *out, const ucontext *uc,
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const struct _libc_fpstate* fpregs) {
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const greg_t* regs = uc->uc_mcontext.gregs;
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out->context_flags = MD_CONTEXT_AMD64_FULL;
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out->cs = regs[REG_CSGSFS] & 0xffff;
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out->fs = (regs[REG_CSGSFS] >> 32) & 0xffff;
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out->gs = (regs[REG_CSGSFS] >> 16) & 0xffff;
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out->eflags = regs[REG_EFL];
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out->rax = regs[REG_RAX];
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out->rcx = regs[REG_RCX];
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out->rdx = regs[REG_RDX];
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out->rbx = regs[REG_RBX];
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out->rsp = regs[REG_RSP];
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out->rbp = regs[REG_RBP];
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out->rsi = regs[REG_RSI];
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out->rdi = regs[REG_RDI];
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out->r8 = regs[REG_R8];
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out->r9 = regs[REG_R9];
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out->r10 = regs[REG_R10];
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out->r11 = regs[REG_R11];
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out->r12 = regs[REG_R12];
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out->r13 = regs[REG_R13];
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out->r14 = regs[REG_R14];
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out->r15 = regs[REG_R15];
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out->rip = regs[REG_RIP];
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out->flt_save.control_word = fpregs->cwd;
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out->flt_save.status_word = fpregs->swd;
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out->flt_save.tag_word = fpregs->ftw;
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out->flt_save.error_opcode = fpregs->fop;
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out->flt_save.error_offset = fpregs->rip;
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out->flt_save.data_offset = fpregs->rdp;
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out->flt_save.error_selector = 0; // We don't have this.
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out->flt_save.data_selector = 0; // We don't have this.
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out->flt_save.mx_csr = fpregs->mxcsr;
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out->flt_save.mx_csr_mask = fpregs->mxcr_mask;
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memcpy(&out->flt_save.float_registers, &fpregs->_st, 8 * 16);
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memcpy(&out->flt_save.xmm_registers, &fpregs->_xmm, 16 * 16);
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}
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#elif defined(__ARMEL__)
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typedef MDRawContextARM RawContextCPU;
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static void CPUFillFromThreadInfo(MDRawContextARM *out,
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const google_breakpad::ThreadInfo &info) {
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out->context_flags = MD_CONTEXT_ARM_FULL;
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for (int i = 0; i < MD_CONTEXT_ARM_GPR_COUNT; ++i)
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out->iregs[i] = info.regs.uregs[i];
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// No CPSR register in ThreadInfo(it's not accessible via ptrace)
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out->cpsr = 0;
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#if !defined(__ANDROID__)
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out->float_save.fpscr = info.fpregs.fpsr |
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(static_cast<u_int64_t>(info.fpregs.fpcr) << 32);
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// TODO: sort this out, actually collect floating point registers
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memset(&out->float_save.regs, 0, sizeof(out->float_save.regs));
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memset(&out->float_save.extra, 0, sizeof(out->float_save.extra));
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#endif
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}
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static void CPUFillFromUContext(MDRawContextARM *out, const ucontext *uc,
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const struct _libc_fpstate* fpregs) {
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out->context_flags = MD_CONTEXT_ARM_FULL;
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out->iregs[0] = uc->uc_mcontext.arm_r0;
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out->iregs[1] = uc->uc_mcontext.arm_r1;
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out->iregs[2] = uc->uc_mcontext.arm_r2;
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out->iregs[3] = uc->uc_mcontext.arm_r3;
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out->iregs[4] = uc->uc_mcontext.arm_r4;
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out->iregs[5] = uc->uc_mcontext.arm_r5;
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out->iregs[6] = uc->uc_mcontext.arm_r6;
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out->iregs[7] = uc->uc_mcontext.arm_r7;
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out->iregs[8] = uc->uc_mcontext.arm_r8;
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out->iregs[9] = uc->uc_mcontext.arm_r9;
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out->iregs[10] = uc->uc_mcontext.arm_r10;
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out->iregs[11] = uc->uc_mcontext.arm_fp;
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out->iregs[12] = uc->uc_mcontext.arm_ip;
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out->iregs[13] = uc->uc_mcontext.arm_sp;
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out->iregs[14] = uc->uc_mcontext.arm_lr;
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out->iregs[15] = uc->uc_mcontext.arm_pc;
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out->cpsr = uc->uc_mcontext.arm_cpsr;
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// TODO: fix this after fixing ExceptionHandler
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out->float_save.fpscr = 0;
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memset(&out->float_save.regs, 0, sizeof(out->float_save.regs));
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memset(&out->float_save.extra, 0, sizeof(out->float_save.extra));
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}
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#else
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#error "This code has not been ported to your platform yet."
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#endif
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namespace google_breakpad {
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class MinidumpWriter {
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public:
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MinidumpWriter(const char* filename,
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pid_t crashing_pid,
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const ExceptionHandler::CrashContext* context,
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const MappingList& mappings)
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: filename_(filename),
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siginfo_(&context->siginfo),
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ucontext_(&context->context),
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#if !defined(__ARM_EABI__)
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float_state_(&context->float_state),
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#else
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// TODO: fix this after fixing ExceptionHandler
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float_state_(NULL),
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#endif
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crashing_tid_(context->tid),
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dumper_(crashing_pid),
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memory_blocks_(dumper_.allocator()),
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mapping_list_(mappings) {
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}
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bool Init() {
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return dumper_.Init() && minidump_writer_.Open(filename_) &&
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dumper_.ThreadsSuspend();
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}
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~MinidumpWriter() {
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minidump_writer_.Close();
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dumper_.ThreadsResume();
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}
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bool Dump() {
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// The dynamic linker makes information available that helps gdb find all
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// DSOs loaded into the program. If we can access this information, we dump
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// it to a MD_LINUX_DSO_DEBUG stream.
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struct r_debug* r_debug = NULL;
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uint32_t dynamic_length = 0;
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#if !defined(__ANDROID__)
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// The Android NDK is missing structure definitions for most of this.
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// For now, it's simpler just to skip it.
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for (int i = 0;;) {
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ElfW(Dyn) dyn;
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dynamic_length += sizeof(dyn);
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dumper_.CopyFromProcess(&dyn, crashing_tid_, _DYNAMIC+i++, sizeof(dyn));
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if (dyn.d_tag == DT_DEBUG) {
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r_debug = (struct r_debug*)dyn.d_un.d_ptr;
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continue;
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} else if (dyn.d_tag == DT_NULL) {
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break;
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}
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}
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#endif
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// A minidump file contains a number of tagged streams. This is the number
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// of stream which we write.
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unsigned kNumWriters = 12;
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if (r_debug)
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++kNumWriters;
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TypedMDRVA<MDRawHeader> header(&minidump_writer_);
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TypedMDRVA<MDRawDirectory> dir(&minidump_writer_);
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if (!header.Allocate())
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return false;
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if (!dir.AllocateArray(kNumWriters))
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return false;
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memset(header.get(), 0, sizeof(MDRawHeader));
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header.get()->signature = MD_HEADER_SIGNATURE;
|
|
header.get()->version = MD_HEADER_VERSION;
|
|
header.get()->time_date_stamp = time(NULL);
|
|
header.get()->stream_count = kNumWriters;
|
|
header.get()->stream_directory_rva = dir.position();
|
|
|
|
unsigned dir_index = 0;
|
|
MDRawDirectory dirent;
|
|
|
|
if (!WriteThreadListStream(&dirent))
|
|
return false;
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
if (!WriteMappings(&dirent))
|
|
return false;
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
if (!WriteMemoryListStream(&dirent))
|
|
return false;
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
if (!WriteExceptionStream(&dirent))
|
|
return false;
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
if (!WriteSystemInfoStream(&dirent))
|
|
return false;
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_CPU_INFO;
|
|
if (!WriteFile(&dirent.location, "/proc/cpuinfo"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_PROC_STATUS;
|
|
if (!WriteProcFile(&dirent.location, crashing_tid_, "status"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_LSB_RELEASE;
|
|
if (!WriteFile(&dirent.location, "/etc/lsb-release"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_CMD_LINE;
|
|
if (!WriteProcFile(&dirent.location, crashing_tid_, "cmdline"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_ENVIRON;
|
|
if (!WriteProcFile(&dirent.location, crashing_tid_, "environ"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_AUXV;
|
|
if (!WriteProcFile(&dirent.location, crashing_tid_, "auxv"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
dirent.stream_type = MD_LINUX_MAPS;
|
|
if (!WriteProcFile(&dirent.location, crashing_tid_, "maps"))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
|
|
if (r_debug) {
|
|
dirent.stream_type = MD_LINUX_DSO_DEBUG;
|
|
if (!WriteDSODebugStream(&dirent, r_debug, dynamic_length))
|
|
NullifyDirectoryEntry(&dirent);
|
|
dir.CopyIndex(dir_index++, &dirent);
|
|
}
|
|
|
|
// If you add more directory entries, don't forget to update kNumWriters,
|
|
// above.
|
|
|
|
dumper_.ThreadsResume();
|
|
return true;
|
|
}
|
|
|
|
// Check if the top of the stack is part of a system call that has been
|
|
// redirected by the seccomp sandbox. If so, try to pop the stack frames
|
|
// all the way back to the point where the interception happened.
|
|
void PopSeccompStackFrame(RawContextCPU* cpu, const MDRawThread& thread,
|
|
uint8_t* stack_copy) {
|
|
#if defined(__x86_64)
|
|
u_int64_t bp = cpu->rbp;
|
|
u_int64_t top = thread.stack.start_of_memory_range;
|
|
for (int i = 4; i--; ) {
|
|
if (bp < top ||
|
|
bp + sizeof(bp) > thread.stack.start_of_memory_range +
|
|
thread.stack.memory.data_size ||
|
|
bp & 1) {
|
|
break;
|
|
}
|
|
uint64_t old_top = top;
|
|
top = bp;
|
|
u_int8_t* bp_addr = stack_copy + bp - thread.stack.start_of_memory_range;
|
|
memcpy(&bp, bp_addr, sizeof(bp));
|
|
if (bp == 0xDEADBEEFDEADBEEFull) {
|
|
struct {
|
|
uint64_t r15;
|
|
uint64_t r14;
|
|
uint64_t r13;
|
|
uint64_t r12;
|
|
uint64_t r11;
|
|
uint64_t r10;
|
|
uint64_t r9;
|
|
uint64_t r8;
|
|
uint64_t rdi;
|
|
uint64_t rsi;
|
|
uint64_t rdx;
|
|
uint64_t rcx;
|
|
uint64_t rbx;
|
|
uint64_t deadbeef;
|
|
uint64_t rbp;
|
|
uint64_t fakeret;
|
|
uint64_t ret;
|
|
/* char redzone[128]; */
|
|
} seccomp_stackframe;
|
|
if (top - offsetof(typeof(seccomp_stackframe), deadbeef) < old_top ||
|
|
top - offsetof(typeof(seccomp_stackframe), deadbeef) +
|
|
sizeof(seccomp_stackframe) >
|
|
thread.stack.start_of_memory_range+thread.stack.memory.data_size) {
|
|
break;
|
|
}
|
|
memcpy(&seccomp_stackframe,
|
|
bp_addr - offsetof(typeof(seccomp_stackframe), deadbeef),
|
|
sizeof(seccomp_stackframe));
|
|
cpu->rbx = seccomp_stackframe.rbx;
|
|
cpu->rcx = seccomp_stackframe.rcx;
|
|
cpu->rdx = seccomp_stackframe.rdx;
|
|
cpu->rsi = seccomp_stackframe.rsi;
|
|
cpu->rdi = seccomp_stackframe.rdi;
|
|
cpu->rbp = seccomp_stackframe.rbp;
|
|
cpu->rsp = top + 4*sizeof(uint64_t) + 128;
|
|
cpu->r8 = seccomp_stackframe.r8;
|
|
cpu->r9 = seccomp_stackframe.r9;
|
|
cpu->r10 = seccomp_stackframe.r10;
|
|
cpu->r11 = seccomp_stackframe.r11;
|
|
cpu->r12 = seccomp_stackframe.r12;
|
|
cpu->r13 = seccomp_stackframe.r13;
|
|
cpu->r14 = seccomp_stackframe.r14;
|
|
cpu->r15 = seccomp_stackframe.r15;
|
|
cpu->rip = seccomp_stackframe.fakeret;
|
|
return;
|
|
}
|
|
}
|
|
#elif defined(__i386)
|
|
u_int32_t bp = cpu->ebp;
|
|
u_int32_t top = thread.stack.start_of_memory_range;
|
|
for (int i = 4; i--; ) {
|
|
if (bp < top ||
|
|
bp + sizeof(bp) > thread.stack.start_of_memory_range +
|
|
thread.stack.memory.data_size ||
|
|
bp & 1) {
|
|
break;
|
|
}
|
|
uint32_t old_top = top;
|
|
top = bp;
|
|
u_int8_t* bp_addr = stack_copy + bp - thread.stack.start_of_memory_range;
|
|
memcpy(&bp, bp_addr, sizeof(bp));
|
|
if (bp == 0xDEADBEEFu) {
|
|
struct {
|
|
uint32_t edi;
|
|
uint32_t esi;
|
|
uint32_t edx;
|
|
uint32_t ecx;
|
|
uint32_t ebx;
|
|
uint32_t deadbeef;
|
|
uint32_t ebp;
|
|
uint32_t fakeret;
|
|
uint32_t ret;
|
|
} seccomp_stackframe;
|
|
if (top - offsetof(typeof(seccomp_stackframe), deadbeef) < old_top ||
|
|
top - offsetof(typeof(seccomp_stackframe), deadbeef) +
|
|
sizeof(seccomp_stackframe) >
|
|
thread.stack.start_of_memory_range+thread.stack.memory.data_size) {
|
|
break;
|
|
}
|
|
memcpy(&seccomp_stackframe,
|
|
bp_addr - offsetof(typeof(seccomp_stackframe), deadbeef),
|
|
sizeof(seccomp_stackframe));
|
|
cpu->ebx = seccomp_stackframe.ebx;
|
|
cpu->ecx = seccomp_stackframe.ecx;
|
|
cpu->edx = seccomp_stackframe.edx;
|
|
cpu->esi = seccomp_stackframe.esi;
|
|
cpu->edi = seccomp_stackframe.edi;
|
|
cpu->ebp = seccomp_stackframe.ebp;
|
|
cpu->esp = top + 4*sizeof(void*);
|
|
cpu->eip = seccomp_stackframe.fakeret;
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// Write information about the threads.
|
|
bool WriteThreadListStream(MDRawDirectory* dirent) {
|
|
const unsigned num_threads = dumper_.threads().size();
|
|
|
|
TypedMDRVA<uint32_t> list(&minidump_writer_);
|
|
if (!list.AllocateObjectAndArray(num_threads, sizeof(MDRawThread)))
|
|
return false;
|
|
|
|
dirent->stream_type = MD_THREAD_LIST_STREAM;
|
|
dirent->location = list.location();
|
|
|
|
*list.get() = num_threads;
|
|
|
|
for (unsigned i = 0; i < num_threads; ++i) {
|
|
MDRawThread thread;
|
|
my_memset(&thread, 0, sizeof(thread));
|
|
thread.thread_id = dumper_.threads()[i];
|
|
// We have a different source of information for the crashing thread. If
|
|
// we used the actual state of the thread we would find it running in the
|
|
// signal handler with the alternative stack, which would be deeply
|
|
// unhelpful.
|
|
if ((pid_t)thread.thread_id == crashing_tid_) {
|
|
const void* stack;
|
|
size_t stack_len;
|
|
if (!dumper_.GetStackInfo(&stack, &stack_len, GetStackPointer()))
|
|
return false;
|
|
UntypedMDRVA memory(&minidump_writer_);
|
|
if (!memory.Allocate(stack_len))
|
|
return false;
|
|
uint8_t* stack_copy = (uint8_t*) dumper_.allocator()->Alloc(stack_len);
|
|
dumper_.CopyFromProcess(stack_copy, thread.thread_id, stack, stack_len);
|
|
memory.Copy(stack_copy, stack_len);
|
|
thread.stack.start_of_memory_range = (uintptr_t) (stack);
|
|
thread.stack.memory = memory.location();
|
|
memory_blocks_.push_back(thread.stack);
|
|
|
|
// Copy 256 bytes around crashing instruction pointer to minidump.
|
|
const size_t kIPMemorySize = 256;
|
|
u_int64_t ip = GetInstructionPointer();
|
|
// Bound it to the upper and lower bounds of the memory map
|
|
// it's contained within. If it's not in mapped memory,
|
|
// don't bother trying to write it.
|
|
bool ip_is_mapped = false;
|
|
MDMemoryDescriptor ip_memory_d;
|
|
for (unsigned i = 0; i < dumper_.mappings().size(); ++i) {
|
|
const MappingInfo& mapping = *dumper_.mappings()[i];
|
|
if (ip >= mapping.start_addr &&
|
|
ip < mapping.start_addr + mapping.size) {
|
|
ip_is_mapped = true;
|
|
// Try to get 128 bytes before and after the IP, but
|
|
// settle for whatever's available.
|
|
ip_memory_d.start_of_memory_range =
|
|
std::max(mapping.start_addr,
|
|
uintptr_t(ip - (kIPMemorySize / 2)));
|
|
uintptr_t end_of_range =
|
|
std::min(uintptr_t(ip + (kIPMemorySize / 2)),
|
|
uintptr_t(mapping.start_addr + mapping.size));
|
|
ip_memory_d.memory.data_size =
|
|
end_of_range - ip_memory_d.start_of_memory_range;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ip_is_mapped) {
|
|
UntypedMDRVA ip_memory(&minidump_writer_);
|
|
if (!ip_memory.Allocate(ip_memory_d.memory.data_size))
|
|
return false;
|
|
uint8_t* memory_copy =
|
|
(uint8_t*) dumper_.allocator()->Alloc(ip_memory_d.memory.data_size);
|
|
dumper_.CopyFromProcess(
|
|
memory_copy,
|
|
thread.thread_id,
|
|
reinterpret_cast<void*>(ip_memory_d.start_of_memory_range),
|
|
ip_memory_d.memory.data_size);
|
|
ip_memory.Copy(memory_copy, ip_memory_d.memory.data_size);
|
|
ip_memory_d.memory = ip_memory.location();
|
|
memory_blocks_.push_back(ip_memory_d);
|
|
}
|
|
|
|
TypedMDRVA<RawContextCPU> cpu(&minidump_writer_);
|
|
if (!cpu.Allocate())
|
|
return false;
|
|
my_memset(cpu.get(), 0, sizeof(RawContextCPU));
|
|
CPUFillFromUContext(cpu.get(), ucontext_, float_state_);
|
|
PopSeccompStackFrame(cpu.get(), thread, stack_copy);
|
|
thread.thread_context = cpu.location();
|
|
crashing_thread_context_ = cpu.location();
|
|
} else {
|
|
ThreadInfo info;
|
|
if (!dumper_.ThreadInfoGet(dumper_.threads()[i], &info))
|
|
return false;
|
|
UntypedMDRVA memory(&minidump_writer_);
|
|
if (!memory.Allocate(info.stack_len))
|
|
return false;
|
|
uint8_t* stack_copy =
|
|
(uint8_t*) dumper_.allocator()->Alloc(info.stack_len);
|
|
dumper_.CopyFromProcess(stack_copy, thread.thread_id, info.stack,
|
|
info.stack_len);
|
|
memory.Copy(stack_copy, info.stack_len);
|
|
thread.stack.start_of_memory_range = (uintptr_t)(info.stack);
|
|
thread.stack.memory = memory.location();
|
|
memory_blocks_.push_back(thread.stack);
|
|
|
|
TypedMDRVA<RawContextCPU> cpu(&minidump_writer_);
|
|
if (!cpu.Allocate())
|
|
return false;
|
|
my_memset(cpu.get(), 0, sizeof(RawContextCPU));
|
|
CPUFillFromThreadInfo(cpu.get(), info);
|
|
PopSeccompStackFrame(cpu.get(), thread, stack_copy);
|
|
thread.thread_context = cpu.location();
|
|
}
|
|
|
|
list.CopyIndexAfterObject(i, &thread, sizeof(thread));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool ShouldIncludeMapping(const MappingInfo& mapping) {
|
|
if (mapping.name[0] == 0 || // only want modules with filenames.
|
|
mapping.offset || // only want to include one mapping per shared lib.
|
|
mapping.size < 4096) { // too small to get a signature for.
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// If there is caller-provided information about this mapping
|
|
// in the mapping_list_ list, return true. Otherwise, return false.
|
|
bool HaveMappingInfo(const MappingInfo& mapping) {
|
|
for (MappingList::const_iterator iter = mapping_list_.begin();
|
|
iter != mapping_list_.end();
|
|
++iter) {
|
|
// Ignore any mappings that are wholly contained within
|
|
// mappings in the mapping_info_ list.
|
|
if (mapping.start_addr >= iter->first.start_addr &&
|
|
(mapping.start_addr + mapping.size) <=
|
|
(iter->first.start_addr + iter->first.size)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Write information about the mappings in effect. Because we are using the
|
|
// minidump format, the information about the mappings is pretty limited.
|
|
// Because of this, we also include the full, unparsed, /proc/$x/maps file in
|
|
// another stream in the file.
|
|
bool WriteMappings(MDRawDirectory* dirent) {
|
|
const unsigned num_mappings = dumper_.mappings().size();
|
|
unsigned num_output_mappings = mapping_list_.size();
|
|
|
|
for (unsigned i = 0; i < dumper_.mappings().size(); ++i) {
|
|
const MappingInfo& mapping = *dumper_.mappings()[i];
|
|
if (ShouldIncludeMapping(mapping) && !HaveMappingInfo(mapping))
|
|
num_output_mappings++;
|
|
}
|
|
|
|
TypedMDRVA<uint32_t> list(&minidump_writer_);
|
|
if (!list.AllocateObjectAndArray(num_output_mappings, MD_MODULE_SIZE))
|
|
return false;
|
|
|
|
dirent->stream_type = MD_MODULE_LIST_STREAM;
|
|
dirent->location = list.location();
|
|
*list.get() = num_output_mappings;
|
|
|
|
// First write all the mappings from the dumper
|
|
unsigned int j = 0;
|
|
for (unsigned i = 0; i < num_mappings; ++i) {
|
|
const MappingInfo& mapping = *dumper_.mappings()[i];
|
|
if (!ShouldIncludeMapping(mapping) || HaveMappingInfo(mapping))
|
|
continue;
|
|
|
|
MDRawModule mod;
|
|
if (!FillRawModule(mapping, i, mod, NULL))
|
|
return false;
|
|
list.CopyIndexAfterObject(j++, &mod, MD_MODULE_SIZE);
|
|
}
|
|
// Next write all the mappings provided by the caller
|
|
for (MappingList::const_iterator iter = mapping_list_.begin();
|
|
iter != mapping_list_.end();
|
|
++iter) {
|
|
MDRawModule mod;
|
|
if (!FillRawModule(iter->first, -1, mod, iter->second))
|
|
return false;
|
|
list.CopyIndexAfterObject(j++, &mod, MD_MODULE_SIZE);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Fill the MDRawModule |mod| with information about the provided
|
|
// |mapping|. If |identifier| is non-NULL, use it instead of calculating
|
|
// a file ID from the mapping. |mapping_id| can be -1.
|
|
bool FillRawModule(const MappingInfo& mapping,
|
|
int mapping_id,
|
|
MDRawModule& mod,
|
|
const u_int8_t* identifier) {
|
|
my_memset(&mod, 0, MD_MODULE_SIZE);
|
|
|
|
mod.base_of_image = mapping.start_addr;
|
|
mod.size_of_image = mapping.size;
|
|
const size_t filepath_len = my_strlen(mapping.name);
|
|
|
|
// Figure out file name from path
|
|
const char* filename_ptr = mapping.name + filepath_len - 1;
|
|
while (filename_ptr >= mapping.name) {
|
|
if (*filename_ptr == '/')
|
|
break;
|
|
filename_ptr--;
|
|
}
|
|
filename_ptr++;
|
|
|
|
const size_t filename_len = mapping.name + filepath_len - filename_ptr;
|
|
|
|
uint8_t cv_buf[MDCVInfoPDB70_minsize + NAME_MAX];
|
|
uint8_t* cv_ptr = cv_buf;
|
|
UntypedMDRVA cv(&minidump_writer_);
|
|
if (!cv.Allocate(MDCVInfoPDB70_minsize + filename_len + 1))
|
|
return false;
|
|
|
|
const uint32_t cv_signature = MD_CVINFOPDB70_SIGNATURE;
|
|
memcpy(cv_ptr, &cv_signature, sizeof(cv_signature));
|
|
cv_ptr += sizeof(cv_signature);
|
|
uint8_t* signature = cv_ptr;
|
|
cv_ptr += sizeof(MDGUID);
|
|
if (identifier) {
|
|
// GUID was provided by caller.
|
|
memcpy(signature, identifier, sizeof(MDGUID));
|
|
} else {
|
|
dumper_.ElfFileIdentifierForMapping(mapping, mapping_id, signature);
|
|
}
|
|
my_memset(cv_ptr, 0, sizeof(uint32_t)); // Set age to 0 on Linux.
|
|
cv_ptr += sizeof(uint32_t);
|
|
|
|
// Write pdb_file_name
|
|
memcpy(cv_ptr, filename_ptr, filename_len + 1);
|
|
cv.Copy(cv_buf, MDCVInfoPDB70_minsize + filename_len + 1);
|
|
|
|
mod.cv_record = cv.location();
|
|
|
|
MDLocationDescriptor ld;
|
|
if (!minidump_writer_.WriteString(mapping.name, filepath_len, &ld))
|
|
return false;
|
|
mod.module_name_rva = ld.rva;
|
|
return true;
|
|
}
|
|
|
|
bool WriteMemoryListStream(MDRawDirectory* dirent) {
|
|
TypedMDRVA<uint32_t> list(&minidump_writer_);
|
|
if (!list.AllocateObjectAndArray(memory_blocks_.size(),
|
|
sizeof(MDMemoryDescriptor)))
|
|
return false;
|
|
|
|
dirent->stream_type = MD_MEMORY_LIST_STREAM;
|
|
dirent->location = list.location();
|
|
|
|
*list.get() = memory_blocks_.size();
|
|
|
|
for (size_t i = 0; i < memory_blocks_.size(); ++i) {
|
|
list.CopyIndexAfterObject(i, &memory_blocks_[i],
|
|
sizeof(MDMemoryDescriptor));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool WriteExceptionStream(MDRawDirectory* dirent) {
|
|
TypedMDRVA<MDRawExceptionStream> exc(&minidump_writer_);
|
|
if (!exc.Allocate())
|
|
return false;
|
|
my_memset(exc.get(), 0, sizeof(MDRawExceptionStream));
|
|
|
|
dirent->stream_type = MD_EXCEPTION_STREAM;
|
|
dirent->location = exc.location();
|
|
|
|
exc.get()->thread_id = crashing_tid_;
|
|
exc.get()->exception_record.exception_code = siginfo_->si_signo;
|
|
exc.get()->exception_record.exception_address =
|
|
(uintptr_t) siginfo_->si_addr;
|
|
exc.get()->thread_context = crashing_thread_context_;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool WriteSystemInfoStream(MDRawDirectory* dirent) {
|
|
TypedMDRVA<MDRawSystemInfo> si(&minidump_writer_);
|
|
if (!si.Allocate())
|
|
return false;
|
|
my_memset(si.get(), 0, sizeof(MDRawSystemInfo));
|
|
|
|
dirent->stream_type = MD_SYSTEM_INFO_STREAM;
|
|
dirent->location = si.location();
|
|
|
|
WriteCPUInformation(si.get());
|
|
WriteOSInformation(si.get());
|
|
|
|
return true;
|
|
}
|
|
|
|
bool WriteDSODebugStream(MDRawDirectory* dirent, struct r_debug* r_debug,
|
|
uint32_t dynamic_length) {
|
|
#if defined(__ANDROID__)
|
|
return false;
|
|
#else
|
|
// The caller provided us with a pointer to "struct r_debug". We can
|
|
// look up the "r_map" field to get a linked list of all loaded DSOs.
|
|
// Our list of DSOs potentially is different from the ones in the crashing
|
|
// process. So, we have to be careful to never dereference pointers
|
|
// directly. Instead, we use CopyFromProcess() everywhere.
|
|
// See <link.h> for a more detailed discussion of the how the dynamic
|
|
// loader communicates with debuggers.
|
|
|
|
// Count the number of loaded DSOs
|
|
int dso_count = 0;
|
|
struct r_debug debug_entry;
|
|
dumper_.CopyFromProcess(&debug_entry, crashing_tid_, r_debug,
|
|
sizeof(debug_entry));
|
|
for (struct link_map* ptr = debug_entry.r_map; ptr; ) {
|
|
struct link_map map;
|
|
dumper_.CopyFromProcess(&map, crashing_tid_, ptr, sizeof(map));
|
|
ptr = map.l_next;
|
|
dso_count++;
|
|
}
|
|
|
|
MDRVA linkmap_rva = minidump_writer_.kInvalidMDRVA;
|
|
if (dso_count > 0) {
|
|
// If we have at least one DSO, create an array of MDRawLinkMap
|
|
// entries in the minidump file.
|
|
TypedMDRVA<MDRawLinkMap> linkmap(&minidump_writer_);
|
|
if (!linkmap.AllocateArray(dso_count))
|
|
return false;
|
|
linkmap_rva = linkmap.location().rva;
|
|
int idx = 0;
|
|
|
|
// Iterate over DSOs and write their information to mini dump
|
|
for (struct link_map* ptr = debug_entry.r_map; ptr; ) {
|
|
struct link_map map;
|
|
dumper_.CopyFromProcess(&map, crashing_tid_, ptr, sizeof(map));
|
|
ptr = map.l_next;
|
|
char filename[257] = { 0 };
|
|
if (map.l_name) {
|
|
dumper_.CopyFromProcess(filename, crashing_tid_, map.l_name,
|
|
sizeof(filename) - 1);
|
|
}
|
|
MDLocationDescriptor location;
|
|
if (!minidump_writer_.WriteString(filename, 0, &location))
|
|
return false;
|
|
MDRawLinkMap entry;
|
|
entry.name = location.rva;
|
|
entry.addr = (void*)map.l_addr;
|
|
entry.ld = (void*)map.l_ld;
|
|
linkmap.CopyIndex(idx++, &entry);
|
|
}
|
|
}
|
|
|
|
// Write MD_LINUX_DSO_DEBUG record
|
|
TypedMDRVA<MDRawDebug> debug(&minidump_writer_);
|
|
if (!debug.AllocateObjectAndArray(1, dynamic_length))
|
|
return false;
|
|
my_memset(debug.get(), 0, sizeof(MDRawDebug));
|
|
dirent->stream_type = MD_LINUX_DSO_DEBUG;
|
|
dirent->location = debug.location();
|
|
|
|
debug.get()->version = debug_entry.r_version;
|
|
debug.get()->map = linkmap_rva;
|
|
debug.get()->dso_count = dso_count;
|
|
debug.get()->brk = (void*)debug_entry.r_brk;
|
|
debug.get()->ldbase = (void*)debug_entry.r_ldbase;
|
|
debug.get()->dynamic = (void*)&_DYNAMIC;
|
|
|
|
char *dso_debug_data = new char[dynamic_length];
|
|
dumper_.CopyFromProcess(dso_debug_data, crashing_tid_, &_DYNAMIC,
|
|
dynamic_length);
|
|
debug.CopyIndexAfterObject(0, dso_debug_data, dynamic_length);
|
|
delete[] dso_debug_data;
|
|
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
#if defined(__i386)
|
|
uintptr_t GetStackPointer() {
|
|
return ucontext_->uc_mcontext.gregs[REG_ESP];
|
|
}
|
|
|
|
uintptr_t GetInstructionPointer() {
|
|
return ucontext_->uc_mcontext.gregs[REG_EIP];
|
|
}
|
|
#elif defined(__x86_64)
|
|
uintptr_t GetStackPointer() {
|
|
return ucontext_->uc_mcontext.gregs[REG_RSP];
|
|
}
|
|
|
|
uintptr_t GetInstructionPointer() {
|
|
return ucontext_->uc_mcontext.gregs[REG_RIP];
|
|
}
|
|
#elif defined(__ARM_EABI__)
|
|
uintptr_t GetStackPointer() {
|
|
return ucontext_->uc_mcontext.arm_sp;
|
|
}
|
|
|
|
uintptr_t GetInstructionPointer() {
|
|
return ucontext_->uc_mcontext.arm_ip;
|
|
}
|
|
#else
|
|
#error "This code has not been ported to your platform yet."
|
|
#endif
|
|
|
|
void NullifyDirectoryEntry(MDRawDirectory* dirent) {
|
|
dirent->stream_type = 0;
|
|
dirent->location.data_size = 0;
|
|
dirent->location.rva = 0;
|
|
}
|
|
|
|
bool WriteCPUInformation(MDRawSystemInfo* sys_info) {
|
|
char vendor_id[sizeof(sys_info->cpu.x86_cpu_info.vendor_id) + 1] = {0};
|
|
static const char vendor_id_name[] = "vendor_id";
|
|
static const size_t vendor_id_name_length = sizeof(vendor_id_name) - 1;
|
|
|
|
struct CpuInfoEntry {
|
|
const char* info_name;
|
|
int value;
|
|
bool found;
|
|
} cpu_info_table[] = {
|
|
{ "processor", -1, false },
|
|
{ "model", 0, false },
|
|
{ "stepping", 0, false },
|
|
{ "cpu family", 0, false },
|
|
};
|
|
|
|
// processor_architecture should always be set, do this first
|
|
sys_info->processor_architecture =
|
|
#if defined(__i386)
|
|
MD_CPU_ARCHITECTURE_X86;
|
|
#elif defined(__x86_64)
|
|
MD_CPU_ARCHITECTURE_AMD64;
|
|
#elif defined(__arm__)
|
|
MD_CPU_ARCHITECTURE_ARM;
|
|
#else
|
|
#error "Unknown CPU arch"
|
|
#endif
|
|
|
|
const int fd = sys_open("/proc/cpuinfo", O_RDONLY, 0);
|
|
if (fd < 0)
|
|
return false;
|
|
|
|
{
|
|
PageAllocator allocator;
|
|
LineReader* const line_reader = new(allocator) LineReader(fd);
|
|
const char* line;
|
|
unsigned line_len;
|
|
while (line_reader->GetNextLine(&line, &line_len)) {
|
|
for (size_t i = 0;
|
|
i < sizeof(cpu_info_table) / sizeof(cpu_info_table[0]);
|
|
i++) {
|
|
CpuInfoEntry* entry = &cpu_info_table[i];
|
|
if (entry->found && i)
|
|
continue;
|
|
if (!strncmp(line, entry->info_name, strlen(entry->info_name))) {
|
|
const char* value = strchr(line, ':');
|
|
if (!value)
|
|
continue;
|
|
|
|
// the above strncmp only matches the prefix, it might be the wrong
|
|
// line. i.e. we matched "model name" instead of "model".
|
|
// check and make sure there is only spaces between the prefix and
|
|
// the colon.
|
|
const char* space_ptr = line + strlen(entry->info_name);
|
|
for (; space_ptr < value; space_ptr++) {
|
|
if (!isspace(*space_ptr)) {
|
|
break;
|
|
}
|
|
}
|
|
if (space_ptr != value)
|
|
continue;
|
|
|
|
sscanf(++value, " %d", &(entry->value));
|
|
entry->found = true;
|
|
}
|
|
}
|
|
|
|
// special case for vendor_id
|
|
if (!strncmp(line, vendor_id_name, vendor_id_name_length)) {
|
|
const char* value = strchr(line, ':');
|
|
if (!value)
|
|
goto popline;
|
|
|
|
// skip ':" and all the spaces that follows
|
|
do {
|
|
value++;
|
|
} while (isspace(*value));
|
|
|
|
if (*value) {
|
|
size_t length = strlen(value);
|
|
if (length == 0)
|
|
goto popline;
|
|
// we don't want the trailing newline
|
|
if (value[length - 1] == '\n')
|
|
length--;
|
|
// ensure we have space for the value
|
|
if (length < sizeof(vendor_id))
|
|
strncpy(vendor_id, value, length);
|
|
}
|
|
}
|
|
|
|
popline:
|
|
line_reader->PopLine(line_len);
|
|
}
|
|
sys_close(fd);
|
|
}
|
|
|
|
// make sure we got everything we wanted
|
|
for (size_t i = 0;
|
|
i < sizeof(cpu_info_table) / sizeof(cpu_info_table[0]);
|
|
i++) {
|
|
if (!cpu_info_table[i].found) {
|
|
return false;
|
|
}
|
|
}
|
|
// /proc/cpuinfo contains cpu id, change it into number by adding one.
|
|
cpu_info_table[0].value++;
|
|
|
|
sys_info->number_of_processors = cpu_info_table[0].value;
|
|
sys_info->processor_level = cpu_info_table[3].value;
|
|
sys_info->processor_revision = cpu_info_table[1].value << 8 |
|
|
cpu_info_table[2].value;
|
|
|
|
if (vendor_id[0] != '\0') {
|
|
memcpy(sys_info->cpu.x86_cpu_info.vendor_id, vendor_id,
|
|
sizeof(sys_info->cpu.x86_cpu_info.vendor_id));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool WriteFile(MDLocationDescriptor* result, const char* filename) {
|
|
const int fd = sys_open(filename, O_RDONLY, 0);
|
|
if (fd < 0)
|
|
return false;
|
|
|
|
// We can't stat the files because several of the files that we want to
|
|
// read are kernel seqfiles, which always have a length of zero. So we have
|
|
// to read as much as we can into a buffer.
|
|
static const unsigned kBufSize = 1024 - 2*sizeof(void*);
|
|
struct Buffers {
|
|
struct Buffers* next;
|
|
size_t len;
|
|
uint8_t data[kBufSize];
|
|
} *buffers =
|
|
(struct Buffers*) dumper_.allocator()->Alloc(sizeof(struct Buffers));
|
|
buffers->next = NULL;
|
|
buffers->len = 0;
|
|
|
|
size_t total = 0;
|
|
for (struct Buffers* bufptr = buffers;;) {
|
|
ssize_t r;
|
|
do {
|
|
r = sys_read(fd, &bufptr->data[bufptr->len], kBufSize - bufptr->len);
|
|
} while (r == -1 && errno == EINTR);
|
|
|
|
if (r < 1)
|
|
break;
|
|
|
|
total += r;
|
|
bufptr->len += r;
|
|
if (bufptr->len == kBufSize) {
|
|
bufptr->next =
|
|
(struct Buffers*) dumper_.allocator()->Alloc(sizeof(struct Buffers));
|
|
bufptr = bufptr->next;
|
|
bufptr->next = NULL;
|
|
bufptr->len = 0;
|
|
}
|
|
}
|
|
sys_close(fd);
|
|
|
|
if (!total)
|
|
return false;
|
|
|
|
UntypedMDRVA memory(&minidump_writer_);
|
|
if (!memory.Allocate(total))
|
|
return false;
|
|
for (MDRVA pos = memory.position(); buffers; buffers = buffers->next) {
|
|
memory.Copy(pos, &buffers->data, buffers->len);
|
|
pos += buffers->len;
|
|
}
|
|
*result = memory.location();
|
|
return true;
|
|
}
|
|
|
|
bool WriteOSInformation(MDRawSystemInfo* sys_info) {
|
|
sys_info->platform_id = MD_OS_LINUX;
|
|
|
|
struct utsname uts;
|
|
if (uname(&uts))
|
|
return false;
|
|
|
|
static const size_t buf_len = 512;
|
|
char buf[buf_len] = {0};
|
|
size_t space_left = buf_len - 1;
|
|
const char* info_table[] = {
|
|
uts.sysname,
|
|
uts.release,
|
|
uts.version,
|
|
uts.machine,
|
|
NULL
|
|
};
|
|
bool first_item = true;
|
|
for (const char** cur_info = info_table; *cur_info; cur_info++) {
|
|
static const char* separator = " ";
|
|
size_t separator_len = strlen(separator);
|
|
size_t info_len = strlen(*cur_info);
|
|
if (info_len == 0)
|
|
continue;
|
|
|
|
if (space_left < info_len + (first_item ? 0 : separator_len))
|
|
break;
|
|
|
|
if (!first_item) {
|
|
strcat(buf, separator);
|
|
space_left -= separator_len;
|
|
}
|
|
|
|
first_item = false;
|
|
strcat(buf, *cur_info);
|
|
space_left -= info_len;
|
|
}
|
|
|
|
MDLocationDescriptor location;
|
|
if (!minidump_writer_.WriteString(buf, 0, &location))
|
|
return false;
|
|
sys_info->csd_version_rva = location.rva;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool WriteProcFile(MDLocationDescriptor* result, pid_t pid,
|
|
const char* filename) {
|
|
char buf[NAME_MAX];
|
|
dumper_.BuildProcPath(buf, pid, filename);
|
|
return WriteFile(result, buf);
|
|
}
|
|
|
|
const char* const filename_; // output filename
|
|
const siginfo_t* const siginfo_; // from the signal handler (see sigaction)
|
|
const struct ucontext* const ucontext_; // also from the signal handler
|
|
const struct _libc_fpstate* const float_state_; // ditto
|
|
const pid_t crashing_tid_; // the process which actually crashed
|
|
LinuxDumper dumper_;
|
|
MinidumpFileWriter minidump_writer_;
|
|
MDLocationDescriptor crashing_thread_context_;
|
|
// Blocks of memory written to the dump. These are all currently
|
|
// written while writing the thread list stream, but saved here
|
|
// so a memory list stream can be written afterwards.
|
|
wasteful_vector<MDMemoryDescriptor> memory_blocks_;
|
|
// Additional information about some mappings provided by the caller.
|
|
const MappingList& mapping_list_;
|
|
};
|
|
|
|
bool WriteMinidump(const char* filename, pid_t crashing_process,
|
|
const void* blob, size_t blob_size) {
|
|
MappingList m;
|
|
return WriteMinidump(filename, crashing_process, blob, blob_size, m);
|
|
}
|
|
|
|
bool WriteMinidump(const char* filename, pid_t crashing_process,
|
|
const void* blob, size_t blob_size,
|
|
const MappingList& mappings) {
|
|
if (blob_size != sizeof(ExceptionHandler::CrashContext))
|
|
return false;
|
|
const ExceptionHandler::CrashContext* context =
|
|
reinterpret_cast<const ExceptionHandler::CrashContext*>(blob);
|
|
MinidumpWriter writer(filename, crashing_process, context, mappings);
|
|
if (!writer.Init())
|
|
return false;
|
|
return writer.Dump();
|
|
}
|
|
|
|
} // namespace google_breakpad
|