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-rw-r--r--base/linux_util.h2
-rw-r--r--chrome/app/chrome_dll_main.cc33
-rw-r--r--chrome/browser/renderer_host/render_sandbox_host_linux.cc80
-rw-r--r--chrome/browser/renderer_host/render_sandbox_host_linux.h17
-rw-r--r--chrome/browser/zygote_host_linux.cc93
-rw-r--r--chrome/browser/zygote_host_linux.h11
-rw-r--r--chrome/browser/zygote_main_linux.cc133
-rwxr-xr-xchrome/chrome.gyp10
-rw-r--r--chrome/common/sandbox_methods_linux.h1
9 files changed, 300 insertions, 80 deletions
diff --git a/base/linux_util.h b/base/linux_util.h
index 657edda..1da519e 100644
--- a/base/linux_util.h
+++ b/base/linux_util.h
@@ -12,6 +12,8 @@
namespace base {
+static const char kFindInodeSwitch[] = "--find-inode";
+
// Makes a copy of |pixels| with the ordering changed from BGRA to RGBA.
// The caller is responsible for free()ing the data. If |stride| is 0,
// it's assumed to be 4 * |width|.
diff --git a/chrome/app/chrome_dll_main.cc b/chrome/app/chrome_dll_main.cc
index f46ec70..22e95d2 100644
--- a/chrome/app/chrome_dll_main.cc
+++ b/chrome/app/chrome_dll_main.cc
@@ -18,8 +18,8 @@
#elif defined(OS_POSIX)
#include <locale.h>
#include <signal.h>
-#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
#endif
@@ -27,6 +27,7 @@
#include <gdk/gdk.h>
#include <glib.h>
#include <gtk/gtk.h>
+#include <stdlib.h>
#include <string.h>
#endif
@@ -58,6 +59,7 @@
#if defined(OS_LINUX)
#include "base/nss_init.h"
#include "chrome/browser/renderer_host/render_sandbox_host_linux.h"
+#include "chrome/browser/zygote_host_linux.h"
#endif
#if defined(OS_MACOSX)
@@ -385,7 +387,7 @@ int ChromeMain(int argc, char** argv) {
browser_pid =
static_cast<base::ProcessId>(StringToInt(WideToASCII(channel_name)));
- DCHECK(browser_pid != 0);
+ DCHECK_NE(browser_pid, 0);
#else
browser_pid = base::GetCurrentProcId();
#endif
@@ -579,8 +581,29 @@ int ChromeMain(int argc, char** argv) {
#endif
} else if (process_type.empty()) {
#if defined(OS_LINUX)
- // Tickle the sandbox host so it forks now.
- Singleton<RenderSandboxHostLinux>().get();
+ const char* sandbox_binary = NULL;
+ struct stat st;
+
+ // In Chromium branded builds, developers can set an environment variable to
+ // use the development sandbox. See
+ // http://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment
+ if (stat("/proc/self/exe", &st) == 0 && st.st_uid == getuid())
+ sandbox_binary = getenv("CHROME_DEVEL_SANDBOX");
+
+#if defined(LINUX_SANDBOX_PATH)
+ if (!sandbox_binary)
+ sandbox_binary = LINUX_SANDBOX_PATH;
+#endif
+
+ std::string sandbox_cmd;
+ if (sandbox_binary)
+ sandbox_cmd = sandbox_binary;
+
+ // Tickle the sandbox host and zygote host so they fork now.
+ RenderSandboxHostLinux* shost = Singleton<RenderSandboxHostLinux>().get();
+ shost->Init(sandbox_cmd);
+ ZygoteHost* zhost = Singleton<ZygoteHost>().get();
+ zhost->Init(sandbox_cmd);
// We want to be sure to init NSPR on the main thread.
base::EnsureNSPRInit();
@@ -595,7 +618,7 @@ int ChromeMain(int argc, char** argv) {
// gtk_init() can change |argc| and |argv|.
gtk_init(&argc, &argv);
SetUpGLibLogHandler();
-#endif
+#endif // defined(OS_LINUX)
ScopedOleInitializer ole_initializer;
rv = BrowserMain(main_params);
diff --git a/chrome/browser/renderer_host/render_sandbox_host_linux.cc b/chrome/browser/renderer_host/render_sandbox_host_linux.cc
index 9e6e609a..f31f71f 100644
--- a/chrome/browser/renderer_host/render_sandbox_host_linux.cc
+++ b/chrome/browser/renderer_host/render_sandbox_host_linux.cc
@@ -11,12 +11,14 @@
#include <sys/poll.h>
#include <time.h>
+#include <vector>
+
+#include "base/command_line.h"
#include "base/eintr_wrapper.h"
-#include "base/platform_file.h"
-#include "base/process_util.h"
-#include "base/logging.h"
-#include "base/message_loop.h"
+#include "base/linux_util.h"
#include "base/pickle.h"
+#include "base/process_util.h"
+#include "base/scoped_ptr.h"
#include "base/string_util.h"
#include "base/unix_domain_socket_posix.h"
#include "chrome/common/sandbox_methods_linux.h"
@@ -42,7 +44,9 @@ class SandboxIPCProcess {
// browser_socket: the browser's end of the sandbox IPC socketpair. From the
// point of view of the renderer, it's talking to the browser but this
// object actually services the requests.
- SandboxIPCProcess(int lifeline_fd, int browser_socket)
+ // sandbox_cmd: the path of the sandbox executable
+ SandboxIPCProcess(int lifeline_fd, int browser_socket,
+ std::string sandbox_cmd)
: lifeline_fd_(lifeline_fd),
browser_socket_(browser_socket),
font_config_(new FontConfigDirect()) {
@@ -51,6 +55,11 @@ class SandboxIPCProcess {
multimap.push_back(base::InjectionArc(0, browser_socket, false));
base::CloseSuperfluousFds(multimap);
+
+ if (!sandbox_cmd.empty()) {
+ sandbox_cmd_.push_back(sandbox_cmd);
+ sandbox_cmd_.push_back(base::kFindInodeSwitch);
+ }
}
void Run() {
@@ -114,6 +123,8 @@ class SandboxIPCProcess {
HandleGetFontFamilyForChars(fd, pickle, iter, fds);
} else if (kind == LinuxSandbox::METHOD_LOCALTIME) {
HandleLocaltime(fd, pickle, iter, fds);
+ } else if (kind == LinuxSandbox::METHOD_GET_CHILD_WITH_INODE) {
+ HandleGetChildWithInode(fd, pickle, iter, fds);
}
error:
@@ -123,7 +134,7 @@ class SandboxIPCProcess {
}
}
- void HandleFontMatchRequest(int fd, Pickle& pickle, void* iter,
+ void HandleFontMatchRequest(int fd, const Pickle& pickle, void* iter,
std::vector<int>& fds) {
bool fileid_valid;
uint32_t fileid;
@@ -162,7 +173,7 @@ class SandboxIPCProcess {
SendRendererReply(fds, reply, -1);
}
- void HandleFontOpenRequest(int fd, Pickle& pickle, void* iter,
+ void HandleFontOpenRequest(int fd, const Pickle& pickle, void* iter,
std::vector<int>& fds) {
uint32_t fileid;
if (!pickle.ReadUInt32(&iter, &fileid))
@@ -182,7 +193,7 @@ class SandboxIPCProcess {
close(result_fd);
}
- void HandleGetFontFamilyForChars(int fd, Pickle& pickle, void* iter,
+ void HandleGetFontFamilyForChars(int fd, const Pickle& pickle, void* iter,
std::vector<int>& fds) {
// The other side of this call is
// chrome/renderer/renderer_sandbox_support_linux.cc
@@ -222,7 +233,7 @@ class SandboxIPCProcess {
SendRendererReply(fds, reply, -1);
}
- void HandleLocaltime(int fd, Pickle& pickle, void* iter,
+ void HandleLocaltime(int fd, const Pickle& pickle, void* iter,
std::vector<int>& fds) {
// The other side of this call is in zygote_main_linux.cc
@@ -247,6 +258,37 @@ class SandboxIPCProcess {
SendRendererReply(fds, reply, -1);
}
+ void HandleGetChildWithInode(int fd, const Pickle& pickle, void* iter,
+ std::vector<int>& fds) {
+ // The other side of this call is in zygote_main_linux.cc
+ if (sandbox_cmd_.empty()) {
+ LOG(ERROR) << "Not in the sandbox, this should not be called";
+ return;
+ }
+
+ uint64_t inode;
+ if (!pickle.ReadUInt64(&iter, &inode))
+ return;
+
+ base::ProcessId pid = 0;
+ std::string inode_output;
+
+ std::vector<std::string> sandbox_cmd = sandbox_cmd_;
+ sandbox_cmd.push_back(IntToString(inode));
+ CommandLine get_inode_cmd(sandbox_cmd);
+ if (base::GetAppOutput(get_inode_cmd, &inode_output))
+ StringToInt(inode_output, &pid);
+
+ if (!pid) {
+ LOG(ERROR) << "Could not get pid";
+ return;
+ }
+
+ Pickle reply;
+ reply.WriteInt(pid);
+ SendRendererReply(fds, reply, -1);
+ }
+
void SendRendererReply(const std::vector<int>& fds, const Pickle& reply,
int reply_fd) {
struct msghdr msg;
@@ -266,7 +308,7 @@ class SandboxIPCProcess {
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
- memcpy(CMSG_DATA(cmsg), &reply_fd, sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &reply_fd, sizeof(reply_fd));
msg.msg_controllen = cmsg->cmsg_len;
}
@@ -278,12 +320,20 @@ class SandboxIPCProcess {
const int lifeline_fd_;
const int browser_socket_;
FontConfigDirect* const font_config_;
+ std::vector<std::string> sandbox_cmd_;
};
// -----------------------------------------------------------------------------
// Runs on the main thread at startup.
-RenderSandboxHostLinux::RenderSandboxHostLinux() {
+RenderSandboxHostLinux::RenderSandboxHostLinux()
+ : init_(false) {
+}
+
+void RenderSandboxHostLinux::Init(const std::string& sandbox_path) {
+ DCHECK(!init_);
+ init_ = true;
+
int fds[2];
// We use SOCK_SEQPACKET rather than SOCK_DGRAM to prevent the renderer from
// sending datagrams to other sockets on the system. The sandbox may prevent
@@ -303,13 +353,15 @@ RenderSandboxHostLinux::RenderSandboxHostLinux() {
pid_ = fork();
if (pid_ == 0) {
- SandboxIPCProcess handler(child_lifeline_fd, browser_socket);
+ SandboxIPCProcess handler(child_lifeline_fd, browser_socket, sandbox_path);
handler.Run();
_exit(0);
}
}
RenderSandboxHostLinux::~RenderSandboxHostLinux() {
- HANDLE_EINTR(close(renderer_socket_));
- HANDLE_EINTR(close(childs_lifeline_fd_));
+ if (init_) {
+ HANDLE_EINTR(close(renderer_socket_));
+ HANDLE_EINTR(close(childs_lifeline_fd_));
+ }
}
diff --git a/chrome/browser/renderer_host/render_sandbox_host_linux.h b/chrome/browser/renderer_host/render_sandbox_host_linux.h
index 6911787..ef871b8 100644
--- a/chrome/browser/renderer_host/render_sandbox_host_linux.h
+++ b/chrome/browser/renderer_host/render_sandbox_host_linux.h
@@ -7,6 +7,9 @@
#ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_SANDBOX_HOST_LINUX_H_
#define CHROME_BROWSER_RENDERER_HOST_RENDER_SANDBOX_HOST_LINUX_H_
+#include <string>
+
+#include "base/logging.h"
#include "base/singleton.h"
// This is a singleton object which handles sandbox requests from the
@@ -15,8 +18,15 @@ class RenderSandboxHostLinux {
public:
// Get the file descriptor which renderers should be given in order to signal
// crashes to the browser.
- int GetRendererSocket() const { return renderer_socket_; }
- pid_t pid() const { return pid_; }
+ int GetRendererSocket() const {
+ DCHECK(init_);
+ return renderer_socket_;
+ }
+ pid_t pid() const {
+ DCHECK(init_);
+ return pid_;
+ }
+ void Init(const std::string& sandbox_path);
private:
friend struct DefaultSingletonTraits<RenderSandboxHostLinux>;
@@ -24,11 +34,12 @@ class RenderSandboxHostLinux {
RenderSandboxHostLinux();
~RenderSandboxHostLinux();
+ bool init_;
int renderer_socket_;
int childs_lifeline_fd_;
pid_t pid_;
- DISALLOW_EVIL_CONSTRUCTORS(RenderSandboxHostLinux);
+ DISALLOW_COPY_AND_ASSIGN(RenderSandboxHostLinux);
};
#endif // CHROME_BROWSER_RENDERER_HOST_RENDER_SANDBOX_HOST_LINUX_H_
diff --git a/chrome/browser/zygote_host_linux.cc b/chrome/browser/zygote_host_linux.cc
index 34159264..aafaecc 100644
--- a/chrome/browser/zygote_host_linux.cc
+++ b/chrome/browser/zygote_host_linux.cc
@@ -4,13 +4,14 @@
#include "chrome/browser/zygote_host_linux.h"
-#include <unistd.h>
-#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
#include "base/command_line.h"
#include "base/eintr_wrapper.h"
+#include "base/linux_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/pickle.h"
@@ -21,6 +22,7 @@
#include "chrome/browser/renderer_host/render_sandbox_host_linux.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_switches.h"
+#include "chrome/common/process_watcher.h"
#include "sandbox/linux/suid/suid_unsafe_environment_variables.h"
@@ -45,7 +47,20 @@ static void SaveSUIDUnsafeEnvironmentVariables() {
}
}
-ZygoteHost::ZygoteHost() {
+ZygoteHost::ZygoteHost()
+ : pid_(-1),
+ init_(false) {
+}
+
+ZygoteHost::~ZygoteHost() {
+ if (init_)
+ close(control_fd_);
+}
+
+void ZygoteHost::Init(const std::string& sandbox_cmd) {
+ DCHECK(!init_);
+ init_ = true;
+
FilePath chrome_path;
CHECK(PathService::Get(base::FILE_EXE, &chrome_path));
CommandLine cmd_line(chrome_path);
@@ -82,26 +97,15 @@ ZygoteHost::ZygoteHost() {
switches::kEnableLogging));
}
- const char* sandbox_binary = NULL;
+ const char* sandbox_binary = sandbox_cmd.c_str();
struct stat st;
- // In Chromium branded builds, developers can set an environment variable to
- // use the development sandbox. See
- // http://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment
- if (stat("/proc/self/exe", &st) == 0 &&
- st.st_uid == getuid()) {
- sandbox_binary = getenv("CHROME_DEVEL_SANDBOX");
- }
-
-#if defined(LINUX_SANDBOX_PATH)
- if (!sandbox_binary)
- sandbox_binary = LINUX_SANDBOX_PATH;
-#endif
-
- if (sandbox_binary && stat(sandbox_binary, &st) == 0) {
+ bool using_suid_sandbox = false;
+ if (!sandbox_cmd.empty() && stat(sandbox_binary, &st) == 0) {
if (access(sandbox_binary, X_OK) == 0 &&
(st.st_mode & S_ISUID) &&
(st.st_mode & S_IXOTH)) {
+ using_suid_sandbox = true;
cmd_line.PrependWrapper(ASCIIToWide(sandbox_binary));
SaveSUIDUnsafeEnvironmentVariables();
@@ -118,22 +122,63 @@ ZygoteHost::ZygoteHost() {
const int sfd = Singleton<RenderSandboxHostLinux>()->GetRendererSocket();
fds_to_map.push_back(std::make_pair(sfd, 5));
+ int dummy_fd = -1;
+ if (using_suid_sandbox) {
+ dummy_fd = socket(PF_UNIX, SOCK_DGRAM, 0);
+ CHECK(dummy_fd >= 0);
+ fds_to_map.push_back(std::make_pair(dummy_fd, 7));
+ }
+
base::ProcessHandle process;
base::LaunchApp(cmd_line.argv(), fds_to_map, false, &process);
CHECK(process != -1) << "Failed to launch zygote process";
- pid_ = process;
+ if (using_suid_sandbox) {
+ // In the SUID sandbox, the real zygote is forked from the sandbox.
+ // We need to look for it.
+ // But first, wait for the zygote to tell us it's running.
+ // The sending code is in chrome/browser/zygote_main_linux.cc.
+ std::vector<int> fds_vec;
+ const int kExpectedLength = sizeof(kZygoteMagic);
+ char buf[kExpectedLength];
+ const ssize_t len = base::RecvMsg(fds[0], buf, sizeof(buf), &fds_vec);
+ CHECK(len == kExpectedLength) << "Incorrect zygote magic length";
+ CHECK(0 == strcmp(buf, kZygoteMagic)) << "Incorrect zygote magic";
+
+ std::string inode_output;
+ ino_t inode = 0;
+ // Figure out the inode for |dummy_fd|, close |dummy_fd| on our end,
+ // and find the zygote process holding |dummy_fd|.
+ if (base::FileDescriptorGetInode(&inode, dummy_fd)) {
+ close(dummy_fd);
+ std::vector<std::string> get_inode_cmdline;
+ get_inode_cmdline.push_back(sandbox_binary);
+ get_inode_cmdline.push_back(base::kFindInodeSwitch);
+ get_inode_cmdline.push_back(IntToString(inode));
+ CommandLine get_inode_cmd(get_inode_cmdline);
+ if (base::GetAppOutput(get_inode_cmd, &inode_output)) {
+ StringToInt(inode_output, &pid_);
+ }
+ }
+ CHECK(pid_ > 0) << "Did not find zygote process";
+
+ if (process != pid_) {
+ // Reap the sandbox.
+ ProcessWatcher::EnsureProcessGetsReaped(process);
+ }
+ } else {
+ // Not using the SUID sandbox.
+ pid_ = process;
+ }
+
close(fds[1]);
control_fd_ = fds[0];
}
-ZygoteHost::~ZygoteHost() {
- close(control_fd_);
-}
-
pid_t ZygoteHost::ForkRenderer(
const std::vector<std::string>& argv,
const base::GlobalDescriptors::Mapping& mapping) {
+ DCHECK(init_);
Pickle pickle;
pickle.WriteInt(kCmdFork);
@@ -162,6 +207,7 @@ pid_t ZygoteHost::ForkRenderer(
}
void ZygoteHost::EnsureProcessTerminated(pid_t process) {
+ DCHECK(init_);
Pickle pickle;
pickle.WriteInt(kCmdReap);
@@ -172,6 +218,7 @@ void ZygoteHost::EnsureProcessTerminated(pid_t process) {
bool ZygoteHost::DidProcessCrash(base::ProcessHandle handle,
bool* child_exited) {
+ DCHECK(init_);
Pickle pickle;
pickle.WriteInt(kCmdDidProcessCrash);
pickle.WriteInt(handle);
diff --git a/chrome/browser/zygote_host_linux.h b/chrome/browser/zygote_host_linux.h
index 516a18b..5b4244c 100644
--- a/chrome/browser/zygote_host_linux.h
+++ b/chrome/browser/zygote_host_linux.h
@@ -5,24 +5,26 @@
#ifndef CHROME_BROWSER_ZYGOTE_HOST_LINUX_H_
#define CHROME_BROWSER_ZYGOTE_HOST_LINUX_H_
+#include <unistd.h>
+
#include <string>
#include <vector>
-#include <unistd.h>
-
#include "base/global_descriptors_posix.h"
#include "base/process.h"
template<typename Type>
struct DefaultSingletonTraits;
+static const char kZygoteMagic[] = "ZYGOTE_OK";
+
// http://code.google.com/p/chromium/wiki/LinuxZygote
// The zygote host is the interface, in the browser process, to the zygote
// process.
class ZygoteHost {
public:
- ~ZygoteHost();
+ void Init(const std::string& sandbox_cmd);
pid_t ForkRenderer(const std::vector<std::string>& command_line,
const base::GlobalDescriptors::Mapping& mapping);
@@ -46,10 +48,11 @@ class ZygoteHost {
private:
friend struct DefaultSingletonTraits<ZygoteHost>;
ZygoteHost();
- void LaunchZygoteProcess();
+ ~ZygoteHost();
int control_fd_; // the socket to the zygote
pid_t pid_;
+ bool init_;
};
#endif // CHROME_BROWSER_ZYGOTE_HOST_LINUX_H_
diff --git a/chrome/browser/zygote_main_linux.cc b/chrome/browser/zygote_main_linux.cc
index ecf7291..b9839d3 100644
--- a/chrome/browser/zygote_main_linux.cc
+++ b/chrome/browser/zygote_main_linux.cc
@@ -3,18 +3,25 @@
// found in the LICENSE file.
#include <dlfcn.h>
-#include <unistd.h>
#include <sys/epoll.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/signal.h>
#include <sys/prctl.h>
+#include <sys/signal.h>
+#include <sys/socket.h>
+#include <sys/types.h>
#include <sys/wait.h>
+#include <unistd.h>
+
+#if defined(CHROMIUM_SELINUX)
+#include <selinux/selinux.h>
+#include <selinux/context.h>
+#endif
#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/eintr_wrapper.h"
#include "base/global_descriptors_posix.h"
+#include "base/hash_tables.h"
+#include "base/linux_util.h"
#include "base/path_service.h"
#include "base/pickle.h"
#include "base/rand_util.h"
@@ -33,16 +40,14 @@
#include "skia/ext/SkFontHost_fontconfig_control.h"
-#if defined(CHROMIUM_SELINUX)
-#include <selinux/selinux.h>
-#include <selinux/context.h>
-#endif
-
#include "unicode/timezone.h"
// http://code.google.com/p/chromium/wiki/LinuxZygote
+static const int kBrowserDescriptor = 3;
static const int kMagicSandboxIPCDescriptor = 5;
+static const int kZygoteIdDescriptor = 7;
+static bool g_suid_sandbox_active = false;
// This is the object which implements the zygote. The ZygoteMain function,
// which is called from ChromeMain, at the the bottom and simple constructs one
@@ -52,7 +57,7 @@ class Zygote {
bool ProcessRequests() {
// A SOCK_SEQPACKET socket is installed in fd 3. We get commands from the
// browser on it.
- // A SOCK_DGRAM is installed in fd 4. This is the sandbox IPC channel.
+ // A SOCK_DGRAM is installed in fd 5. This is the sandbox IPC channel.
// See http://code.google.com/p/chromium/wiki/LinuxSandboxIPC
// We need to accept SIGCHLD, even though our handler is a no-op because
@@ -62,8 +67,17 @@ class Zygote {
action.sa_handler = SIGCHLDHandler;
CHECK(sigaction(SIGCHLD, &action, NULL) == 0);
+ if (g_suid_sandbox_active) {
+ // Let the ZygoteHost know we are ready to go.
+ // The receiving code is in chrome/browser/zygote_host_linux.cc.
+ std::vector<int> empty;
+ bool r = base::SendMsg(kBrowserDescriptor, kZygoteMagic,
+ sizeof(kZygoteMagic), empty);
+ CHECK(r) << "Sending zygote magic failed";
+ }
+
for (;;) {
- if (HandleRequestFromBrowser(3))
+ if (HandleRequestFromBrowser(kBrowserDescriptor))
return true;
}
}
@@ -122,20 +136,30 @@ class Zygote {
return false;
}
- bool HandleReapRequest(int fd, Pickle& pickle, void* iter) {
- pid_t child;
+ bool HandleReapRequest(int fd, const Pickle& pickle, void* iter) {
+ base::ProcessId child;
+ base::ProcessId actual_child;
if (!pickle.ReadInt(&iter, &child)) {
LOG(WARNING) << "Error parsing reap request from browser";
return false;
}
- ProcessWatcher::EnsureProcessTerminated(child);
+ if (g_suid_sandbox_active) {
+ actual_child = real_pids_to_sandbox_pids[child];
+ if (!actual_child)
+ return false;
+ real_pids_to_sandbox_pids.erase(child);
+ } else {
+ actual_child = child;
+ }
+
+ ProcessWatcher::EnsureProcessTerminated(actual_child);
return false;
}
- bool HandleDidProcessCrash(int fd, Pickle& pickle, void* iter) {
+ bool HandleDidProcessCrash(int fd, const Pickle& pickle, void* iter) {
base::ProcessHandle child;
if (!pickle.ReadInt(&iter, &child)) {
@@ -144,7 +168,13 @@ class Zygote {
}
bool child_exited;
- bool did_crash = base::DidProcessCrash(&child_exited, child);
+ bool did_crash;
+ if (g_suid_sandbox_active)
+ child = real_pids_to_sandbox_pids[child];
+ if (child)
+ did_crash = base::DidProcessCrash(&child_exited, child);
+ else
+ did_crash = child_exited = false;
Pickle write_pickle;
write_pickle.WriteBool(did_crash);
@@ -156,12 +186,14 @@ class Zygote {
// Handle a 'fork' request from the browser: this means that the browser
// wishes to start a new renderer.
- bool HandleForkRequest(int fd, Pickle& pickle, void* iter,
+ bool HandleForkRequest(int fd, const Pickle& pickle, void* iter,
std::vector<int>& fds) {
std::vector<std::string> args;
int argc, numfds;
base::GlobalDescriptors::Mapping mapping;
- pid_t child;
+ base::ProcessId child;
+ uint64_t dummy_inode = 0;
+ int dummy_fd = -1;
if (!pickle.ReadInt(&iter, &argc))
goto error;
@@ -186,12 +218,22 @@ class Zygote {
}
mapping.push_back(std::make_pair(
- static_cast<uint32_t>(kSandboxIPCChannel), 5));
+ static_cast<uint32_t>(kSandboxIPCChannel), kMagicSandboxIPCDescriptor));
+
+ if (g_suid_sandbox_active) {
+ dummy_fd = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (dummy_fd < 0)
+ goto error;
+
+ if (!base::FileDescriptorGetInode(&dummy_inode, dummy_fd))
+ goto error;
+ }
child = fork();
if (!child) {
- close(3); // our socket from the browser is in fd 3
+ close(kBrowserDescriptor); // our socket from the browser
+ close(kZygoteIdDescriptor); // another socket from the browser
Singleton<base::GlobalDescriptors>()->Reset(mapping);
// Reset the process-wide command line to our new command line.
@@ -200,22 +242,59 @@ class Zygote {
CommandLine::ForCurrentProcess()->InitFromArgv(args);
CommandLine::SetProcTitle();
return true;
+ } else if (child < 0) {
+ LOG(ERROR) << "Zygote could not fork";
+ goto error;
}
- for (std::vector<int>::const_iterator
- i = fds.begin(); i != fds.end(); ++i)
- close(*i);
+ {
+ base::ProcessId proc_id;
+ if (g_suid_sandbox_active) {
+ close(dummy_fd);
+ dummy_fd = -1;
+ uint8_t reply_buf[512];
+ Pickle request;
+ request.WriteInt(LinuxSandbox::METHOD_GET_CHILD_WITH_INODE);
+ request.WriteUInt64(dummy_inode);
+
+ const ssize_t r = base::SendRecvMsg(kMagicSandboxIPCDescriptor,
+ reply_buf, sizeof(reply_buf),
+ NULL, request);
+ if (r == -1)
+ goto error;
+
+ Pickle reply(reinterpret_cast<char*>(reply_buf), r);
+ void* iter2 = NULL;
+ if (!reply.ReadInt(&iter2, &proc_id))
+ goto error;
+ real_pids_to_sandbox_pids[proc_id] = child;
+ } else {
+ proc_id = child;
+ }
- HANDLE_EINTR(write(fd, &child, sizeof(child)));
- return false;
+ for (std::vector<int>::const_iterator
+ i = fds.begin(); i != fds.end(); ++i)
+ close(*i);
+
+ HANDLE_EINTR(write(fd, &proc_id, sizeof(proc_id)));
+ return false;
+ }
error:
- LOG(WARNING) << "Error parsing fork request from browser";
+ LOG(ERROR) << "Error parsing fork request from browser";
for (std::vector<int>::const_iterator
i = fds.begin(); i != fds.end(); ++i)
close(*i);
+ if (dummy_fd >= 0)
+ close(dummy_fd);
return false;
}
+
+ // In the SUID sandbox, we try to use a new PID namespace. Thus the PIDs
+ // fork() returns are not the real PIDs, so we need to map the Real PIDS
+ // into the sandbox PID namespace.
+ typedef base::hash_map<base::ProcessHandle, base::ProcessHandle> ProcessMap;
+ ProcessMap real_pids_to_sandbox_pids;
};
// With SELinux we can carve out a precise sandbox, so we don't have to play
@@ -402,6 +481,8 @@ static bool EnterSandbox() {
// over which we can signal that we have completed our startup and can be
// chrooted.
+ g_suid_sandbox_active = true;
+
char* endptr;
const long fd_long = strtol(sandbox_fd_string, &endptr, 10);
if (!*sandbox_fd_string || *endptr || fd_long < 0 || fd_long > INT_MAX)
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index c2f061c..4ef2bff 100755
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -2531,11 +2531,6 @@
'browser/renderer_host/render_crash_handler_host_linux_stub.cc',
],
}],
- ['linux_sandbox_path != ""', {
- 'defines': [
- 'LINUX_SANDBOX_PATH="<(linux_sandbox_path)"',
- ],
- }],
],
}],
['OS=="linux" and toolkit_views==0', {
@@ -3785,6 +3780,11 @@
'../sandbox/sandbox.gyp:sandbox',
],
}],
+ ['linux_sandbox_path != ""', {
+ 'defines': [
+ 'LINUX_SANDBOX_PATH="<(linux_sandbox_path)"',
+ ],
+ }],
],
}],
['OS=="mac" or OS=="win"', {
diff --git a/chrome/common/sandbox_methods_linux.h b/chrome/common/sandbox_methods_linux.h
index 4dceba0..22fbf29 100644
--- a/chrome/common/sandbox_methods_linux.h
+++ b/chrome/common/sandbox_methods_linux.h
@@ -14,6 +14,7 @@ class LinuxSandbox {
enum Methods {
METHOD_GET_FONT_FAMILY_FOR_CHARS = 32,
METHOD_LOCALTIME = 33,
+ METHOD_GET_CHILD_WITH_INODE = 34,
};
};
generated by cgit v1.1 at 2024-12-26 05:56:17 +0000