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1 //===-- sanitizer_flags.h ---------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file describes common flags available in all sanitizers.
10 //
11 //===----------------------------------------------------------------------===//
13 #ifndef COMMON_FLAG
14 #error "Define COMMON_FLAG prior to including this file!"
15 #endif
17 // COMMON_FLAG(Type, Name, DefaultValue, Description)
18 // Supported types: bool, const char *, int, uptr.
19 // Default value must be a compile-time constant.
20 // Description must be a string literal.
22 COMMON_FLAG(
23 bool, symbolize, true,
24 "If set, use the online symbolizer from common sanitizer runtime to turn "
25 "virtual addresses to file/line locations.")
26 COMMON_FLAG(
27 const char *, external_symbolizer_path, nullptr,
28 "Path to external symbolizer. If empty, the tool will search $PATH for "
29 "the symbolizer.")
30 COMMON_FLAG(
31 bool, allow_addr2line, false,
32 "If set, allows online symbolizer to run addr2line binary to symbolize "
33 "stack traces (addr2line will only be used if llvm-symbolizer binary is "
34 "unavailable.")
35 COMMON_FLAG(const char *, strip_path_prefix, "",
36 "Strips this prefix from file paths in error reports.")
37 COMMON_FLAG(bool, fast_unwind_on_check, false,
38 "If available, use the fast frame-pointer-based unwinder on "
39 "internal CHECK failures.")
40 COMMON_FLAG(bool, fast_unwind_on_fatal, false,
41 "If available, use the fast frame-pointer-based unwinder on fatal "
42 "errors.")
43 // ARM thumb/thumb2 frame pointer is inconsistent on GCC and Clang [1]
44 // and fast-unwider is also unreliable with mixing arm and thumb code [2].
45 // [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92172
46 // [2] https://bugs.llvm.org/show_bug.cgi?id=44158
47 COMMON_FLAG(bool, fast_unwind_on_malloc,
48 !(SANITIZER_LINUX && !SANITIZER_ANDROID && SANITIZER_ARM),
49 "If available, use the fast frame-pointer-based unwinder on "
50 "malloc/free.")
51 COMMON_FLAG(bool, handle_ioctl, false, "Intercept and handle ioctl requests.")
52 COMMON_FLAG(int, malloc_context_size, 1,
53 "Max number of stack frames kept for each allocation/deallocation.")
54 COMMON_FLAG(
55 const char *, log_path, nullptr,
56 "Write logs to \"log_path.pid\". The special values are \"stdout\" and "
57 "\"stderr\". If unspecified, defaults to \"stderr\".")
58 COMMON_FLAG(
59 bool, log_exe_name, false,
60 "Mention name of executable when reporting error and "
61 "append executable name to logs (as in \"log_path.exe_name.pid\").")
62 COMMON_FLAG(
63 bool, log_to_syslog, (bool)SANITIZER_ANDROID || (bool)SANITIZER_MAC,
64 "Write all sanitizer output to syslog in addition to other means of "
65 "logging.")
66 COMMON_FLAG(
67 int, verbosity, 0,
68 "Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).")
69 COMMON_FLAG(bool, strip_env, 1,
70 "Whether to remove the sanitizer from DYLD_INSERT_LIBRARIES to "
71 "avoid passing it to children. Default is true.")
72 COMMON_FLAG(bool, detect_leaks, !SANITIZER_MAC, "Enable memory leak detection.")
73 COMMON_FLAG(
74 bool, leak_check_at_exit, true,
75 "Invoke leak checking in an atexit handler. Has no effect if "
76 "detect_leaks=false, or if __lsan_do_leak_check() is called before the "
77 "handler has a chance to run.")
78 COMMON_FLAG(bool, allocator_may_return_null, false,
79 "If false, the allocator will crash instead of returning 0 on "
80 "out-of-memory.")
81 COMMON_FLAG(bool, print_summary, true,
82 "If false, disable printing error summaries in addition to error "
83 "reports.")
84 COMMON_FLAG(int, print_module_map, 0,
85 "Print the process module map where supported (0 - don't print, "
86 "1 - print only once before process exits, 2 - print after each "
87 "report).")
88 COMMON_FLAG(bool, check_printf, true, "Check printf arguments.")
89 #define COMMON_FLAG_HANDLE_SIGNAL_HELP(signal) \
90 "Controls custom tool's " #signal " handler (0 - do not registers the " \
91 "handler, 1 - register the handler and allow user to set own, " \
92 "2 - registers the handler and block user from changing it). "
93 COMMON_FLAG(HandleSignalMode, handle_segv, kHandleSignalYes,
94 COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGSEGV))
95 COMMON_FLAG(HandleSignalMode, handle_sigbus, kHandleSignalYes,
96 COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGBUS))
97 COMMON_FLAG(HandleSignalMode, handle_abort, kHandleSignalNo,
98 COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGABRT))
99 COMMON_FLAG(HandleSignalMode, handle_sigill, kHandleSignalNo,
100 COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGILL))
101 COMMON_FLAG(HandleSignalMode, handle_sigtrap, kHandleSignalNo,
102 COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGTRAP))
103 COMMON_FLAG(HandleSignalMode, handle_sigfpe, kHandleSignalYes,
104 COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGFPE))
105 #undef COMMON_FLAG_HANDLE_SIGNAL_HELP
106 COMMON_FLAG(bool, allow_user_segv_handler, true,
107 "Deprecated. True has no effect, use handle_sigbus=1. If false, "
108 "handle_*=1 will be upgraded to handle_*=2.")
109 COMMON_FLAG(bool, use_sigaltstack, true,
110 "If set, uses alternate stack for signal handling.")
111 COMMON_FLAG(bool, detect_deadlocks, true,
112 "If set, deadlock detection is enabled.")
113 COMMON_FLAG(
114 uptr, clear_shadow_mmap_threshold, 64 * 1024,
115 "Large shadow regions are zero-filled using mmap(NORESERVE) instead of "
116 "memset(). This is the threshold size in bytes.")
117 COMMON_FLAG(const char *, color, "auto",
118 "Colorize reports: (always|never|auto).")
119 COMMON_FLAG(
120 bool, legacy_pthread_cond, false,
121 "Enables support for dynamic libraries linked with libpthread 2.2.5.")
122 COMMON_FLAG(bool, intercept_tls_get_addr, false, "Intercept __tls_get_addr.")
123 COMMON_FLAG(bool, help, false, "Print the flag descriptions.")
124 COMMON_FLAG(uptr, mmap_limit_mb, 0,
125 "Limit the amount of mmap-ed memory (excluding shadow) in Mb; "
126 "not a user-facing flag, used mosly for testing the tools")
127 COMMON_FLAG(uptr, hard_rss_limit_mb, 0,
128 "Hard RSS limit in Mb."
129 " If non-zero, a background thread is spawned at startup"
130 " which periodically reads RSS and aborts the process if the"
131 " limit is reached")
132 COMMON_FLAG(uptr, soft_rss_limit_mb, 0,
133 "Soft RSS limit in Mb."
134 " If non-zero, a background thread is spawned at startup"
135 " which periodically reads RSS. If the limit is reached"
136 " all subsequent malloc/new calls will fail or return NULL"
137 " (depending on the value of allocator_may_return_null)"
138 " until the RSS goes below the soft limit."
139 " This limit does not affect memory allocations other than"
140 " malloc/new.")
141 COMMON_FLAG(uptr, max_allocation_size_mb, 0,
142 "If non-zero, malloc/new calls larger than this size will return "
143 "nullptr (or crash if allocator_may_return_null=false).")
144 COMMON_FLAG(bool, heap_profile, false, "Experimental heap profiler, asan-only")
145 COMMON_FLAG(s32, allocator_release_to_os_interval_ms,
146 ((bool)SANITIZER_FUCHSIA || (bool)SANITIZER_WINDOWS) ? -1 : 5000,
147 "Only affects a 64-bit allocator. If set, tries to release unused "
148 "memory to the OS, but not more often than this interval (in "
149 "milliseconds). Negative values mean do not attempt to release "
150 "memory to the OS.\n")
151 COMMON_FLAG(bool, can_use_proc_maps_statm, true,
152 "If false, do not attempt to read /proc/maps/statm."
153 " Mostly useful for testing sanitizers.")
154 COMMON_FLAG(
155 bool, coverage, false,
156 "If set, coverage information will be dumped at program shutdown (if the "
157 "coverage instrumentation was enabled at compile time).")
158 COMMON_FLAG(const char *, coverage_dir, ".",
159 "Target directory for coverage dumps. Defaults to the current "
160 "directory.")
161 COMMON_FLAG(bool, full_address_space, false,
162 "Sanitize complete address space; "
163 "by default kernel area on 32-bit platforms will not be sanitized")
164 COMMON_FLAG(bool, print_suppressions, true,
165 "Print matched suppressions at exit.")
166 COMMON_FLAG(
167 bool, disable_coredump, (SANITIZER_WORDSIZE == 64) && !SANITIZER_GO,
168 "Disable core dumping. By default, disable_coredump=1 on 64-bit to avoid"
169 " dumping a 16T+ core file. Ignored on OSes that don't dump core by"
170 " default and for sanitizers that don't reserve lots of virtual memory.")
171 COMMON_FLAG(bool, use_madv_dontdump, true,
172 "If set, instructs kernel to not store the (huge) shadow "
173 "in core file.")
174 COMMON_FLAG(bool, symbolize_inline_frames, true,
175 "Print inlined frames in stacktraces. Defaults to true.")
176 COMMON_FLAG(bool, symbolize_vs_style, false,
177 "Print file locations in Visual Studio style (e.g: "
178 " file(10,42): ...")
179 COMMON_FLAG(int, dedup_token_length, 0,
180 "If positive, after printing a stack trace also print a short "
181 "string token based on this number of frames that will simplify "
182 "deduplication of the reports. "
183 "Example: 'DEDUP_TOKEN: foo-bar-main'. Default is 0.")
184 COMMON_FLAG(const char *, stack_trace_format, "DEFAULT",
185 "Format string used to render stack frames. "
186 "See sanitizer_stacktrace_printer.h for the format description. "
187 "Use DEFAULT to get default format.")
188 COMMON_FLAG(bool, no_huge_pages_for_shadow, true,
189 "If true, the shadow is not allowed to use huge pages. ")
190 COMMON_FLAG(bool, strict_string_checks, false,
191 "If set check that string arguments are properly null-terminated")
192 COMMON_FLAG(bool, intercept_strstr, true,
193 "If set, uses custom wrappers for strstr and strcasestr functions "
194 "to find more errors.")
195 COMMON_FLAG(bool, intercept_strspn, true,
196 "If set, uses custom wrappers for strspn and strcspn function "
197 "to find more errors.")
198 COMMON_FLAG(bool, intercept_strtok, true,
199 "If set, uses a custom wrapper for the strtok function "
200 "to find more errors.")
201 COMMON_FLAG(bool, intercept_strpbrk, true,
202 "If set, uses custom wrappers for strpbrk function "
203 "to find more errors.")
204 COMMON_FLAG(
205 bool, intercept_strcmp, true,
206 "If set, uses custom wrappers for strcmp functions to find more errors.")
207 COMMON_FLAG(bool, intercept_strlen, true,
208 "If set, uses custom wrappers for strlen and strnlen functions "
209 "to find more errors.")
210 COMMON_FLAG(bool, intercept_strndup, true,
211 "If set, uses custom wrappers for strndup functions "
212 "to find more errors.")
213 COMMON_FLAG(bool, intercept_strchr, true,
214 "If set, uses custom wrappers for strchr, strchrnul, and strrchr "
215 "functions to find more errors.")
216 COMMON_FLAG(bool, intercept_memcmp, true,
217 "If set, uses custom wrappers for memcmp function "
218 "to find more errors.")
219 COMMON_FLAG(bool, strict_memcmp, true,
220 "If true, assume that memcmp(p1, p2, n) always reads n bytes before "
221 "comparing p1 and p2.")
222 COMMON_FLAG(bool, intercept_memmem, true,
223 "If set, uses a wrapper for memmem() to find more errors.")
224 COMMON_FLAG(bool, intercept_intrin, true,
225 "If set, uses custom wrappers for memset/memcpy/memmove "
226 "intrinsics to find more errors.")
227 COMMON_FLAG(bool, intercept_stat, true,
228 "If set, uses custom wrappers for *stat functions "
229 "to find more errors.")
230 COMMON_FLAG(bool, intercept_send, true,
231 "If set, uses custom wrappers for send* functions "
232 "to find more errors.")
233 COMMON_FLAG(bool, decorate_proc_maps, (bool)SANITIZER_ANDROID,
234 "If set, decorate sanitizer mappings in /proc/self/maps with "
235 "user-readable names")
236 COMMON_FLAG(int, exitcode, 1, "Override the program exit status if the tool "
237 "found an error")
238 COMMON_FLAG(
239 bool, abort_on_error, (bool)SANITIZER_ANDROID || (bool)SANITIZER_MAC,
240 "If set, the tool calls abort() instead of _exit() after printing the "
241 "error report.")
242 COMMON_FLAG(bool, suppress_equal_pcs, true,
243 "Deduplicate multiple reports for single source location in "
244 "halt_on_error=false mode (asan only).")
245 COMMON_FLAG(bool, print_cmdline, false, "Print command line on crash "
246 "(asan only).")
247 COMMON_FLAG(bool, html_cov_report, false, "Generate html coverage report.")
248 COMMON_FLAG(const char *, sancov_path, "sancov", "Sancov tool location.")
249 COMMON_FLAG(bool, dump_instruction_bytes, false,
250 "If true, dump 16 bytes starting at the instruction that caused SEGV")
251 COMMON_FLAG(bool, dump_registers, true,
252 "If true, dump values of CPU registers when SEGV happens. Only "
253 "available on OS X for now.")
254 COMMON_FLAG(bool, detect_write_exec, false,
255 "If true, triggers warning when writable-executable pages requests "
256 "are being made")
257 COMMON_FLAG(bool, test_only_emulate_no_memorymap, false,
258 "TEST ONLY fail to read memory mappings to emulate sanitized "
259 "\"init\"")