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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // A mini-zygote specifically for Native Client. | 5 // A mini-zygote specifically for Native Client. |
6 | 6 |
7 #include "chrome/common/nacl_helper_linux.h" | 7 #include "chrome/common/nacl_helper_linux.h" |
8 | 8 |
9 #include <errno.h> | 9 #include <errno.h> |
10 #include <link.h> | 10 #include <link.h> |
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138 // structure. The debugger will look for that symbol by name to | 138 // structure. The debugger will look for that symbol by name to |
139 // discover the addresses of key dynamic linker data structures. | 139 // discover the addresses of key dynamic linker data structures. |
140 // Since all it knows about is the original main executable, which | 140 // Since all it knows about is the original main executable, which |
141 // is the bootstrap program, it finds the symbol defined there. The | 141 // is the bootstrap program, it finds the symbol defined there. The |
142 // dynamic linker's structure is somewhere else, but it is filled in | 142 // dynamic linker's structure is somewhere else, but it is filled in |
143 // after initialization. The parts that really matter to the | 143 // after initialization. The parts that really matter to the |
144 // debugger never change. So we just copy the contents of the | 144 // debugger never change. So we just copy the contents of the |
145 // dynamic linker's structure into the address provided by the option. | 145 // dynamic linker's structure into the address provided by the option. |
146 // Hereafter, if someone attaches a debugger (or examines a core dump), | 146 // Hereafter, if someone attaches a debugger (or examines a core dump), |
147 // the debugger will find all the symbols in the normal way. | 147 // the debugger will find all the symbols in the normal way. |
148 static void CheckRDebug(char *argv0) { | 148 static void CheckRDebug(char* argv0) { |
149 std::string r_debug_switch_value = | 149 std::string r_debug_switch_value = |
150 CommandLine::ForCurrentProcess()->GetSwitchValueASCII(kNaClHelperRDebug); | 150 CommandLine::ForCurrentProcess()->GetSwitchValueASCII(kNaClHelperRDebug); |
151 if (!r_debug_switch_value.empty()) { | 151 if (!r_debug_switch_value.empty()) { |
152 char *endp; | 152 char* endp; |
153 uintptr_t r_debug_addr = strtoul(r_debug_switch_value.c_str(), &endp, 0); | 153 uintptr_t r_debug_addr = strtoul(r_debug_switch_value.c_str(), &endp, 0); |
154 if (r_debug_addr != 0 && *endp == '\0') { | 154 if (r_debug_addr != 0 && *endp == '\0') { |
155 struct r_debug *bootstrap_r_debug = (struct r_debug *) r_debug_addr; | 155 r_debug* bootstrap_r_debug = reinterpret_cast<r_debug*>(r_debug_addr); |
156 *bootstrap_r_debug = _r_debug; | 156 *bootstrap_r_debug = _r_debug; |
157 | 157 |
158 // Since the main executable (the bootstrap program) does not | 158 // Since the main executable (the bootstrap program) does not |
159 // have a dynamic section, the debugger will not skip the | 159 // have a dynamic section, the debugger will not skip the |
160 // first element of the link_map list as it usually would for | 160 // first element of the link_map list as it usually would for |
161 // an executable or PIE that was loaded normally. But the | 161 // an executable or PIE that was loaded normally. But the |
162 // dynamic linker has set l_name for the PIE to "" as is | 162 // dynamic linker has set l_name for the PIE to "" as is |
163 // normal for the main executable. So the debugger doesn't | 163 // normal for the main executable. So the debugger doesn't |
164 // know which file it is. Fill in the actual file name, which | 164 // know which file it is. Fill in the actual file name, which |
165 // came in as our argv[0]. | 165 // came in as our argv[0]. |
166 struct link_map *l = _r_debug.r_map; | 166 link_map* l = _r_debug.r_map; |
167 if (l->l_name[0] == '\0') | 167 if (l->l_name[0] == '\0') |
168 l->l_name = argv0; | 168 l->l_name = argv0; |
169 } | 169 } |
170 } | 170 } |
171 } | 171 } |
172 | 172 |
173 // The zygote passes --reserved_at_zero=0xXXXXXXXXXXXXXXXX. | 173 // The zygote passes --reserved_at_zero=0xXXXXXXXXXXXXXXXX. |
174 // nacl_helper_bootstrap replaces the Xs with the amount of prereserved | 174 // nacl_helper_bootstrap replaces the Xs with the amount of prereserved |
175 // sandbox memory. | 175 // sandbox memory. |
176 // | 176 // |
177 // CheckReservedAtZero parses the value of the argument reserved_at_zero | 177 // CheckReservedAtZero parses the value of the argument reserved_at_zero |
178 // and returns the amount of prereserved sandbox memory. | 178 // and returns the amount of prereserved sandbox memory. |
179 static size_t CheckReservedAtZero() { | 179 static size_t CheckReservedAtZero() { |
180 size_t prereserved_sandbox_size = 0; | 180 size_t prereserved_sandbox_size = 0; |
181 std::string reserved_at_zero_switch_value = | 181 std::string reserved_at_zero_switch_value = |
182 CommandLine::ForCurrentProcess()->GetSwitchValueASCII( | 182 CommandLine::ForCurrentProcess()->GetSwitchValueASCII( |
183 kNaClHelperReservedAtZero); | 183 kNaClHelperReservedAtZero); |
184 if (!reserved_at_zero_switch_value.empty()) { | 184 if (!reserved_at_zero_switch_value.empty()) { |
185 char *endp; | 185 char* endp; |
186 prereserved_sandbox_size = | 186 prereserved_sandbox_size = |
187 strtoul(reserved_at_zero_switch_value.c_str(), &endp, 0); | 187 strtoul(reserved_at_zero_switch_value.c_str(), &endp, 0); |
188 if (*endp != '\0') | 188 if (*endp != '\0') |
189 LOG(ERROR) << "Could not parse reserved_at_zero argument value of " | 189 LOG(ERROR) << "Could not parse reserved_at_zero argument value of " |
190 << reserved_at_zero_switch_value; | 190 << reserved_at_zero_switch_value; |
191 } | 191 } |
192 return prereserved_sandbox_size; | 192 return prereserved_sandbox_size; |
193 } | 193 } |
194 | 194 |
195 #if defined(ADDRESS_SANITIZER) | 195 #if defined(ADDRESS_SANITIZER) |
196 // Do not install the SIGSEGV handler in ASan. This should make the NaCl | 196 // Do not install the SIGSEGV handler in ASan. This should make the NaCl |
197 // platform qualification test pass. | 197 // platform qualification test pass. |
198 static const char kAsanDefaultOptionsNaCl[] = "handle_segv=0"; | 198 static const char kAsanDefaultOptionsNaCl[] = "handle_segv=0"; |
199 | 199 |
200 // Override the default ASan options for the NaCl helper. | 200 // Override the default ASan options for the NaCl helper. |
201 // __asan_default_options should not be instrumented, because it is called | 201 // __asan_default_options should not be instrumented, because it is called |
202 // before ASan is initialized. | 202 // before ASan is initialized. |
203 extern "C" | 203 extern "C" |
204 __attribute__((no_address_safety_analysis)) | 204 __attribute__((no_address_safety_analysis)) |
205 const char *__asan_default_options() { | 205 const char* __asan_default_options() { |
206 return kAsanDefaultOptionsNaCl; | 206 return kAsanDefaultOptionsNaCl; |
207 } | 207 } |
208 #endif | 208 #endif |
209 | 209 |
210 int main(int argc, char *argv[]) { | 210 int main(int argc, char* argv[]) { |
211 CommandLine::Init(argc, argv); | 211 CommandLine::Init(argc, argv); |
212 base::AtExitManager exit_manager; | 212 base::AtExitManager exit_manager; |
213 base::RandUint64(); // acquire /dev/urandom fd before sandbox is raised | 213 base::RandUint64(); // acquire /dev/urandom fd before sandbox is raised |
214 #if !defined(CHROMIUM_SELINUX) | 214 #if !defined(CHROMIUM_SELINUX) |
215 // Allows NSS to fopen() /dev/urandom. | 215 // Allows NSS to fopen() /dev/urandom. |
216 sandbox::InitLibcUrandomOverrides(); | 216 sandbox::InitLibcUrandomOverrides(); |
217 #endif | 217 #endif |
218 #if defined(USE_NSS) | 218 #if defined(USE_NSS) |
219 // Configure NSS for use inside the NaCl process. | 219 // Configure NSS for use inside the NaCl process. |
220 // The fork check has not caused problems for NaCl, but this appears to be | 220 // The fork check has not caused problems for NaCl, but this appears to be |
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268 _exit(-1); | 268 _exit(-1); |
269 } | 269 } |
270 // if fork fails, send PID=-1 to zygote | 270 // if fork fails, send PID=-1 to zygote |
271 if (!UnixDomainSocket::SendMsg(kNaClZygoteDescriptor, &badpid, | 271 if (!UnixDomainSocket::SendMsg(kNaClZygoteDescriptor, &badpid, |
272 sizeof(badpid), empty)) { | 272 sizeof(badpid), empty)) { |
273 LOG(ERROR) << "*** send() to zygote failed"; | 273 LOG(ERROR) << "*** send() to zygote failed"; |
274 } | 274 } |
275 } | 275 } |
276 CHECK(false); // This routine must not return | 276 CHECK(false); // This routine must not return |
277 } | 277 } |
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