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//===----------------------------------------------------------------------===//
12
13#ifndef COMMON_FLAG
14#error "Define COMMON_FLAG prior to including this file!"
15#endif
16
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.
21
22COMMON_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.")
26COMMON_FLAG(
27    const char *, external_symbolizer_path, nullptr,
28    "Path to external symbolizer. If empty, the tool will search $PATH for "
29    "the symbolizer.")
30COMMON_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.")
35COMMON_FLAG(const char *, strip_path_prefix, "",
36            "Strips this prefix from file paths in error reports.")
37COMMON_FLAG(bool, fast_unwind_on_check, false,
38            "If available, use the fast frame-pointer-based unwinder on "
39            "internal CHECK failures.")
40COMMON_FLAG(bool, fast_unwind_on_fatal, false,
41            "If available, use the fast frame-pointer-based unwinder on fatal "
42            "errors.")
43COMMON_FLAG(bool, fast_unwind_on_malloc, true,
44            "If available, use the fast frame-pointer-based unwinder on "
45            "malloc/free.")
46COMMON_FLAG(bool, handle_ioctl, false, "Intercept and handle ioctl requests.")
47COMMON_FLAG(int, malloc_context_size, 1,
48            "Max number of stack frames kept for each allocation/deallocation.")
49COMMON_FLAG(
50    const char *, log_path, "stderr",
51    "Write logs to \"log_path.pid\". The special values are \"stdout\" and "
52    "\"stderr\". The default is \"stderr\".")
53COMMON_FLAG(
54    bool, log_exe_name, false,
55    "Mention name of executable when reporting error and "
56    "append executable name to logs (as in \"log_path.exe_name.pid\").")
57COMMON_FLAG(
58    bool, log_to_syslog, (bool)SANITIZER_ANDROID || (bool)SANITIZER_MAC,
59    "Write all sanitizer output to syslog in addition to other means of "
60    "logging.")
61COMMON_FLAG(
62    int, verbosity, 0,
63    "Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).")
64COMMON_FLAG(bool, strip_env, 1,
65            "Whether to remove the sanitizer from DYLD_INSERT_LIBRARIES to "
66            "avoid passing it to children. Default is true.")
67COMMON_FLAG(bool, detect_leaks, !SANITIZER_MAC, "Enable memory leak detection.")
68COMMON_FLAG(
69    bool, leak_check_at_exit, true,
70    "Invoke leak checking in an atexit handler. Has no effect if "
71    "detect_leaks=false, or if __lsan_do_leak_check() is called before the "
72    "handler has a chance to run.")
73COMMON_FLAG(bool, allocator_may_return_null, false,
74            "If false, the allocator will crash instead of returning 0 on "
75            "out-of-memory.")
76COMMON_FLAG(bool, print_summary, true,
77            "If false, disable printing error summaries in addition to error "
78            "reports.")
79COMMON_FLAG(int, print_module_map, 0,
80            "OS X only (0 - don't print, 1 - print only once before process "
81            "exits, 2 - print after each report).")
82COMMON_FLAG(bool, check_printf, true, "Check printf arguments.")
83#define COMMON_FLAG_HANDLE_SIGNAL_HELP(signal) \
84    "Controls custom tool's " #signal " handler (0 - do not registers the " \
85    "handler, 1 - register the handler and allow user to set own, " \
86    "2 - registers the handler and block user from changing it). "
87COMMON_FLAG(HandleSignalMode, handle_segv, kHandleSignalYes,
88            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGSEGV))
89COMMON_FLAG(HandleSignalMode, handle_sigbus, kHandleSignalYes,
90            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGBUS))
91COMMON_FLAG(HandleSignalMode, handle_abort, kHandleSignalNo,
92            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGABRT))
93COMMON_FLAG(HandleSignalMode, handle_sigill, kHandleSignalNo,
94            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGILL))
95COMMON_FLAG(HandleSignalMode, handle_sigtrap, kHandleSignalNo,
96            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGTRAP))
97COMMON_FLAG(HandleSignalMode, handle_sigfpe, kHandleSignalYes,
98            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGFPE))
99#undef COMMON_FLAG_HANDLE_SIGNAL_HELP
100COMMON_FLAG(bool, allow_user_segv_handler, true,
101            "Deprecated. True has no effect, use handle_sigbus=1. If false, "
102            "handle_*=1 will be upgraded to handle_*=2.")
103COMMON_FLAG(bool, use_sigaltstack, true,
104            "If set, uses alternate stack for signal handling.")
105COMMON_FLAG(bool, detect_deadlocks, true,
106            "If set, deadlock detection is enabled.")
107COMMON_FLAG(
108    uptr, clear_shadow_mmap_threshold, 64 * 1024,
109    "Large shadow regions are zero-filled using mmap(NORESERVE) instead of "
110    "memset(). This is the threshold size in bytes.")
111COMMON_FLAG(const char *, color, "auto",
112            "Colorize reports: (always|never|auto).")
113COMMON_FLAG(
114    bool, legacy_pthread_cond, false,
115    "Enables support for dynamic libraries linked with libpthread 2.2.5.")
116COMMON_FLAG(bool, intercept_tls_get_addr, false, "Intercept __tls_get_addr.")
117COMMON_FLAG(bool, help, false, "Print the flag descriptions.")
118COMMON_FLAG(uptr, mmap_limit_mb, 0,
119            "Limit the amount of mmap-ed memory (excluding shadow) in Mb; "
120            "not a user-facing flag, used mosly for testing the tools")
121COMMON_FLAG(uptr, hard_rss_limit_mb, 0,
122            "Hard RSS limit in Mb."
123            " If non-zero, a background thread is spawned at startup"
124            " which periodically reads RSS and aborts the process if the"
125            " limit is reached")
126COMMON_FLAG(uptr, soft_rss_limit_mb, 0,
127            "Soft RSS limit in Mb."
128            " If non-zero, a background thread is spawned at startup"
129            " which periodically reads RSS. If the limit is reached"
130            " all subsequent malloc/new calls will fail or return NULL"
131            " (depending on the value of allocator_may_return_null)"
132            " until the RSS goes below the soft limit."
133            " This limit does not affect memory allocations other than"
134            " malloc/new.")
135COMMON_FLAG(uptr, max_allocation_size_mb, 0,
136            "If non-zero, malloc/new calls larger than this size will return "
137            "nullptr (or crash if allocator_may_return_null=false).")
138COMMON_FLAG(bool, heap_profile, false, "Experimental heap profiler, asan-only")
139COMMON_FLAG(s32, allocator_release_to_os_interval_ms,
140            ((bool)SANITIZER_FUCHSIA || (bool)SANITIZER_WINDOWS) ? -1 : 5000,
141            "Only affects a 64-bit allocator. If set, tries to release unused "
142            "memory to the OS, but not more often than this interval (in "
143            "milliseconds). Negative values mean do not attempt to release "
144            "memory to the OS.\n")
145COMMON_FLAG(bool, can_use_proc_maps_statm, true,
146            "If false, do not attempt to read /proc/maps/statm."
147            " Mostly useful for testing sanitizers.")
148COMMON_FLAG(
149    bool, coverage, false,
150    "If set, coverage information will be dumped at program shutdown (if the "
151    "coverage instrumentation was enabled at compile time).")
152COMMON_FLAG(const char *, coverage_dir, ".",
153            "Target directory for coverage dumps. Defaults to the current "
154            "directory.")
155COMMON_FLAG(bool, full_address_space, false,
156            "Sanitize complete address space; "
157            "by default kernel area on 32-bit platforms will not be sanitized")
158COMMON_FLAG(bool, print_suppressions, true,
159            "Print matched suppressions at exit.")
160COMMON_FLAG(
161    bool, disable_coredump, (SANITIZER_WORDSIZE == 64) && !SANITIZER_GO,
162    "Disable core dumping. By default, disable_coredump=1 on 64-bit to avoid"
163    " dumping a 16T+ core file. Ignored on OSes that don't dump core by"
164    " default and for sanitizers that don't reserve lots of virtual memory.")
165COMMON_FLAG(bool, use_madv_dontdump, true,
166          "If set, instructs kernel to not store the (huge) shadow "
167          "in core file.")
168COMMON_FLAG(bool, symbolize_inline_frames, true,
169            "Print inlined frames in stacktraces. Defaults to true.")
170COMMON_FLAG(bool, symbolize_vs_style, false,
171            "Print file locations in Visual Studio style (e.g: "
172            " file(10,42): ...")
173COMMON_FLAG(int, dedup_token_length, 0,
174            "If positive, after printing a stack trace also print a short "
175            "string token based on this number of frames that will simplify "
176            "deduplication of the reports. "
177            "Example: 'DEDUP_TOKEN: foo-bar-main'. Default is 0.")
178COMMON_FLAG(const char *, stack_trace_format, "DEFAULT",
179            "Format string used to render stack frames. "
180            "See sanitizer_stacktrace_printer.h for the format description. "
181            "Use DEFAULT to get default format.")
182COMMON_FLAG(bool, no_huge_pages_for_shadow, true,
183            "If true, the shadow is not allowed to use huge pages. ")
184COMMON_FLAG(bool, strict_string_checks, false,
185            "If set check that string arguments are properly null-terminated")
186COMMON_FLAG(bool, intercept_strstr, true,
187            "If set, uses custom wrappers for strstr and strcasestr functions "
188            "to find more errors.")
189COMMON_FLAG(bool, intercept_strspn, true,
190            "If set, uses custom wrappers for strspn and strcspn function "
191            "to find more errors.")
192COMMON_FLAG(bool, intercept_strtok, true,
193            "If set, uses a custom wrapper for the strtok function "
194            "to find more errors.")
195COMMON_FLAG(bool, intercept_strpbrk, true,
196            "If set, uses custom wrappers for strpbrk function "
197            "to find more errors.")
198COMMON_FLAG(bool, intercept_strlen, true,
199            "If set, uses custom wrappers for strlen and strnlen functions "
200            "to find more errors.")
201COMMON_FLAG(bool, intercept_strndup, true,
202            "If set, uses custom wrappers for strndup functions "
203            "to find more errors.")
204COMMON_FLAG(bool, intercept_strchr, true,
205            "If set, uses custom wrappers for strchr, strchrnul, and strrchr "
206            "functions to find more errors.")
207COMMON_FLAG(bool, intercept_memcmp, true,
208            "If set, uses custom wrappers for memcmp function "
209            "to find more errors.")
210COMMON_FLAG(bool, strict_memcmp, true,
211          "If true, assume that memcmp(p1, p2, n) always reads n bytes before "
212          "comparing p1 and p2.")
213COMMON_FLAG(bool, intercept_memmem, true,
214            "If set, uses a wrapper for memmem() to find more errors.")
215COMMON_FLAG(bool, intercept_intrin, true,
216            "If set, uses custom wrappers for memset/memcpy/memmove "
217            "intrinsics to find more errors.")
218COMMON_FLAG(bool, intercept_stat, true,
219            "If set, uses custom wrappers for *stat functions "
220            "to find more errors.")
221COMMON_FLAG(bool, intercept_send, true,
222            "If set, uses custom wrappers for send* functions "
223            "to find more errors.")
224COMMON_FLAG(bool, decorate_proc_maps, (bool)SANITIZER_ANDROID,
225            "If set, decorate sanitizer mappings in /proc/self/maps with "
226            "user-readable names")
227COMMON_FLAG(int, exitcode, 1, "Override the program exit status if the tool "
228                              "found an error")
229COMMON_FLAG(
230    bool, abort_on_error, (bool)SANITIZER_ANDROID || (bool)SANITIZER_MAC,
231    "If set, the tool calls abort() instead of _exit() after printing the "
232    "error report.")
233COMMON_FLAG(bool, suppress_equal_pcs, true,
234            "Deduplicate multiple reports for single source location in "
235            "halt_on_error=false mode (asan only).")
236COMMON_FLAG(bool, print_cmdline, false, "Print command line on crash "
237            "(asan only).")
238COMMON_FLAG(bool, html_cov_report, false, "Generate html coverage report.")
239COMMON_FLAG(const char *, sancov_path, "sancov", "Sancov tool location.")
240COMMON_FLAG(bool, dump_instruction_bytes, false,
241          "If true, dump 16 bytes starting at the instruction that caused SEGV")
242COMMON_FLAG(bool, dump_registers, true,
243          "If true, dump values of CPU registers when SEGV happens. Only "
244          "available on OS X for now.")
245COMMON_FLAG(bool, detect_write_exec, false,
246          "If true, triggers warning when writable-executable pages requests "
247          "are being made")
248COMMON_FLAG(bool, test_only_emulate_no_memorymap, false,
249            "TEST ONLY fail to read memory mappings to emulate sanitized "
250            "\"init\"")
251