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Merge of Breakpad Chrome Linux fork

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A=agl, Lei Zhang
R=nealsid, agl



git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@384 4c0a9323-5329-0410-9bdc-e9ce6186880e
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nealsid
2009-08-17 23:12:53 +00:00
parent 7c48629d49
commit b0baafc4da
29 changed files with 6750 additions and 2288 deletions
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src/client/linux/handler/exception_handler_unittest.cc Normal file
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// Copyright (c) 2009, 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.
#include <string>
#include <stdint.h>
#include <unistd.h>
#include <signal.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include "client/linux/handler//exception_handler.h"
#include "client/linux/minidump_writer/minidump_writer.h"
#include "common/linux/linux_libc_support.h"
#include "common/linux/linux_syscall_support.h"
#include "breakpad_googletest_includes.h"
// This provides a wrapper around system calls which may be
// interrupted by a signal and return EINTR. See man 7 signal.
#define HANDLE_EINTR(x) ({ \
typeof(x) __eintr_result__; \
do { \
__eintr_result__ = x; \
} while (__eintr_result__ == -1 && errno == EINTR); \
__eintr_result__;\
})
using namespace google_breakpad;
static void sigchld_handler(int signo) { }
class ExceptionHandlerTest : public ::testing::Test {
protected:
void SetUp() {
// We need to be able to wait for children, so SIGCHLD cannot be SIG_IGN.
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sigchld_handler;
ASSERT_NE(sigaction(SIGCHLD, &sa, &old_action), -1);
}
void TearDown() {
sigaction(SIGCHLD, &old_action, NULL);
}
struct sigaction old_action;
};
TEST(ExceptionHandlerTest, Simple) {
ExceptionHandler handler("/tmp", NULL, NULL, NULL, true);
}
static bool DoneCallback(const char* dump_path,
const char* minidump_id,
void* context,
bool succeeded) {
if (!succeeded)
return succeeded;
int fd = (int) context;
uint32_t len = my_strlen(minidump_id);
HANDLE_EINTR(sys_write(fd, &len, sizeof(len)));
HANDLE_EINTR(sys_write(fd, minidump_id, len));
sys_close(fd);
return true;
}
TEST(ExceptionHandlerTest, ChildCrash) {
int fds[2];
ASSERT_NE(pipe(fds), -1);
const pid_t child = fork();
if (child == 0) {
close(fds[0]);
ExceptionHandler handler("/tmp", NULL, DoneCallback, (void*) fds[1],
true);
*reinterpret_cast<int*>(NULL) = 0;
}
close(fds[1]);
int status;
ASSERT_NE(HANDLE_EINTR(waitpid(child, &status, 0)), -1);
ASSERT_TRUE(WIFSIGNALED(status));
ASSERT_EQ(WTERMSIG(status), SIGSEGV);
struct pollfd pfd;
memset(&pfd, 0, sizeof(pfd));
pfd.fd = fds[0];
pfd.events = POLLIN | POLLERR;
const int r = HANDLE_EINTR(poll(&pfd, 1, 0));
ASSERT_EQ(r, 1);
ASSERT_TRUE(pfd.revents & POLLIN);
uint32_t len;
ASSERT_EQ(read(fds[0], &len, sizeof(len)), sizeof(len));
ASSERT_LT(len, 2048);
char* filename = reinterpret_cast<char*>(malloc(len + 1));
ASSERT_EQ(read(fds[0], filename, len), len);
filename[len] = 0;
close(fds[0]);
const std::string minidump_filename = std::string("/tmp/") + filename +
".dmp";
struct stat st;
ASSERT_EQ(stat(minidump_filename.c_str(), &st), 0);
ASSERT_GT(st.st_size, 0u);
unlink(minidump_filename.c_str());
}
static const unsigned kControlMsgSize =
CMSG_SPACE(sizeof(int)) + CMSG_SPACE(sizeof(struct ucred));
static bool
CrashHandler(const void* crash_context, size_t crash_context_size,
void* context) {
const int fd = (int) context;
int fds[2];
pipe(fds);
struct kernel_msghdr msg = {0};
struct kernel_iovec iov;
iov.iov_base = const_cast<void*>(crash_context);
iov.iov_len = crash_context_size;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
char cmsg[kControlMsgSize];
memset(cmsg, 0, kControlMsgSize);
msg.msg_control = cmsg;
msg.msg_controllen = sizeof(cmsg);
struct cmsghdr *hdr = CMSG_FIRSTHDR(&msg);
hdr->cmsg_level = SOL_SOCKET;
hdr->cmsg_type = SCM_RIGHTS;
hdr->cmsg_len = CMSG_LEN(sizeof(int));
*((int*) CMSG_DATA(hdr)) = fds[1];
hdr = CMSG_NXTHDR((struct msghdr*) &msg, hdr);
hdr->cmsg_level = SOL_SOCKET;
hdr->cmsg_type = SCM_CREDENTIALS;
hdr->cmsg_len = CMSG_LEN(sizeof(struct ucred));
struct ucred *cred = reinterpret_cast<struct ucred*>(CMSG_DATA(hdr));
cred->uid = getuid();
cred->gid = getgid();
cred->pid = getpid();
HANDLE_EINTR(sys_sendmsg(fd, &msg, 0));
sys_close(fds[1]);
char b;
HANDLE_EINTR(sys_read(fds[0], &b, 1));
return true;
}
TEST(ExceptionHandlerTest, ExternalDumper) {
int fds[2];
ASSERT_NE(socketpair(AF_UNIX, SOCK_DGRAM, 0, fds), -1);
static const int on = 1;
setsockopt(fds[0], SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
setsockopt(fds[1], SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
const pid_t child = fork();
if (child == 0) {
close(fds[0]);
ExceptionHandler handler("/tmp", NULL, NULL, (void*) fds[1], true);
handler.set_crash_handler(CrashHandler);
*reinterpret_cast<int*>(NULL) = 0;
}
close(fds[1]);
struct msghdr msg = {0};
struct iovec iov;
static const unsigned kCrashContextSize =
sizeof(ExceptionHandler::CrashContext);
char context[kCrashContextSize];
char control[kControlMsgSize];
iov.iov_base = context;
iov.iov_len = kCrashContextSize;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = control;
msg.msg_controllen = kControlMsgSize;
const ssize_t n = HANDLE_EINTR(recvmsg(fds[0], &msg, 0));
ASSERT_EQ(n, kCrashContextSize);
ASSERT_EQ(msg.msg_controllen, kControlMsgSize);
ASSERT_EQ(msg.msg_flags, 0);
pid_t crashing_pid = -1;
int signal_fd = -1;
for (struct cmsghdr *hdr = CMSG_FIRSTHDR(&msg); hdr;
hdr = CMSG_NXTHDR(&msg, hdr)) {
if (hdr->cmsg_level != SOL_SOCKET)
continue;
if (hdr->cmsg_type == SCM_RIGHTS) {
const unsigned len = hdr->cmsg_len -
(((uint8_t*)CMSG_DATA(hdr)) - (uint8_t*)hdr);
ASSERT_EQ(len, sizeof(int));
signal_fd = *((int *) CMSG_DATA(hdr));
} else if (hdr->cmsg_type == SCM_CREDENTIALS) {
const struct ucred *cred =
reinterpret_cast<struct ucred*>(CMSG_DATA(hdr));
crashing_pid = cred->pid;
}
}
ASSERT_NE(crashing_pid, -1);
ASSERT_NE(signal_fd, -1);
char templ[] = "/tmp/exception-handler-unittest-XXXXXX";
mktemp(templ);
ASSERT_TRUE(WriteMinidump(templ, crashing_pid, context,
kCrashContextSize));
static const char b = 0;
HANDLE_EINTR(write(signal_fd, &b, 1));
int status;
ASSERT_NE(HANDLE_EINTR(waitpid(child, &status, 0)), -1);
ASSERT_TRUE(WIFSIGNALED(status));
ASSERT_EQ(WTERMSIG(status), SIGSEGV);
struct stat st;
ASSERT_EQ(stat(templ, &st), 0);
ASSERT_GT(st.st_size, 0u);
unlink(templ);
}