1//===-- sanitizer/common_interface_defs.h -----------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Common part of the public sanitizer interface.
11//===----------------------------------------------------------------------===//
12
13#ifndef SANITIZER_COMMON_INTERFACE_DEFS_H
14#define SANITIZER_COMMON_INTERFACE_DEFS_H
15
16#include <stddef.h>
17#include <stdint.h>
18
19// GCC does not understand __has_feature.
20#if !defined(__has_feature)
21# define __has_feature(x) 0
22#endif
23
24#ifdef __cplusplus
25extern "C" {
26#endif
27  // Arguments for __sanitizer_sandbox_on_notify() below.
28  typedef struct {
29    // Enable sandbox support in sanitizer coverage.
30    int coverage_sandboxed;
31    // File descriptor to write coverage data to. If -1 is passed, a file will
32    // be pre-opened by __sanitizer_sandobx_on_notify(). This field has no
33    // effect if coverage_sandboxed == 0.
34    intptr_t coverage_fd;
35    // If non-zero, split the coverage data into well-formed blocks. This is
36    // useful when coverage_fd is a socket descriptor. Each block will contain
37    // a header, allowing data from multiple processes to be sent over the same
38    // socket.
39    unsigned int coverage_max_block_size;
40  } __sanitizer_sandbox_arguments;
41
42  // Tell the tools to write their reports to "path.<pid>" instead of stderr.
43  void __sanitizer_set_report_path(const char *path);
44  // Tell the tools to write their reports to the provided file descriptor
45  // (casted to void *).
46  void __sanitizer_set_report_fd(void *fd);
47
48  // Notify the tools that the sandbox is going to be turned on. The reserved
49  // parameter will be used in the future to hold a structure with functions
50  // that the tools may call to bypass the sandbox.
51  void __sanitizer_sandbox_on_notify(__sanitizer_sandbox_arguments *args);
52
53  // This function is called by the tool when it has just finished reporting
54  // an error. 'error_summary' is a one-line string that summarizes
55  // the error message. This function can be overridden by the client.
56  void __sanitizer_report_error_summary(const char *error_summary);
57
58  // Some of the sanitizers (e.g. asan/tsan) may miss bugs that happen
59  // in unaligned loads/stores. In order to find such bugs reliably one needs
60  // to replace plain unaligned loads/stores with these calls.
61  uint16_t __sanitizer_unaligned_load16(const void *p);
62  uint32_t __sanitizer_unaligned_load32(const void *p);
63  uint64_t __sanitizer_unaligned_load64(const void *p);
64  void __sanitizer_unaligned_store16(void *p, uint16_t x);
65  void __sanitizer_unaligned_store32(void *p, uint32_t x);
66  void __sanitizer_unaligned_store64(void *p, uint64_t x);
67
68  // Returns 1 on the first call, then returns 0 thereafter.  Called by the tool
69  // to ensure only one report is printed when multiple errors occur
70  // simultaneously.
71  int __sanitizer_acquire_crash_state();
72
73  // Annotate the current state of a contiguous container, such as
74  // std::vector, std::string or similar.
75  // A contiguous container is a container that keeps all of its elements
76  // in a contiguous region of memory. The container owns the region of memory
77  // [beg, end); the memory [beg, mid) is used to store the current elements
78  // and the memory [mid, end) is reserved for future elements;
79  // beg <= mid <= end. For example, in "std::vector<> v"
80  //   beg = &v[0];
81  //   end = beg + v.capacity() * sizeof(v[0]);
82  //   mid = beg + v.size()     * sizeof(v[0]);
83  //
84  // This annotation tells the Sanitizer tool about the current state of the
85  // container so that the tool can report errors when memory from [mid, end)
86  // is accessed. Insert this annotation into methods like push_back/pop_back.
87  // Supply the old and the new values of mid (old_mid/new_mid).
88  // In the initial state mid == end and so should be the final
89  // state when the container is destroyed or when it reallocates the storage.
90  //
91  // Use with caution and don't use for anything other than vector-like classes.
92  //
93  // For AddressSanitizer, 'beg' should be 8-aligned and 'end' should
94  // be either 8-aligned or it should point to the end of a separate heap-,
95  // stack-, or global- allocated buffer. I.e. the following will not work:
96  //   int64_t x[2];  // 16 bytes, 8-aligned.
97  //   char *beg = (char *)&x[0];
98  //   char *end = beg + 12;  // Not 8 aligned, not the end of the buffer.
99  // This however will work fine:
100  //   int32_t x[3];  // 12 bytes, but 8-aligned under AddressSanitizer.
101  //   char *beg = (char*)&x[0];
102  //   char *end = beg + 12;  // Not 8-aligned, but is the end of the buffer.
103  void __sanitizer_annotate_contiguous_container(const void *beg,
104                                                 const void *end,
105                                                 const void *old_mid,
106                                                 const void *new_mid);
107  // Returns true if the contiguous container [beg, end) is properly poisoned
108  // (e.g. with __sanitizer_annotate_contiguous_container), i.e. if
109  //  - [beg, mid) is addressable,
110  //  - [mid, end) is unaddressable.
111  // Full verification requires O(end-beg) time; this function tries to avoid
112  // such complexity by touching only parts of the container around beg/mid/end.
113  int __sanitizer_verify_contiguous_container(const void *beg, const void *mid,
114                                              const void *end);
115
116  // Similar to __sanitizer_verify_contiguous_container but returns the address
117  // of the first improperly poisoned byte otherwise. Returns null if the area
118  // is poisoned properly.
119  const void *__sanitizer_contiguous_container_find_bad_address(
120      const void *beg, const void *mid, const void *end);
121
122  // Print the stack trace leading to this call. Useful for debugging user code.
123  void __sanitizer_print_stack_trace(void);
124
125  // Symbolizes the supplied 'pc' using the format string 'fmt'.
126  // Outputs at most 'out_buf_size' bytes into 'out_buf'.
127  // If 'out_buf' is not empty then output is zero or more non empty C strings
128  // followed by single empty C string. Multiple strings can be returned if PC
129  // corresponds to inlined function. Inlined frames are printed in the order
130  // from "most-inlined" to the "least-inlined", so the last frame should be the
131  // not inlined function.
132  // Inlined frames can be removed with 'symbolize_inline_frames=0'.
133  // The format syntax is described in
134  // lib/sanitizer_common/sanitizer_stacktrace_printer.h.
135  void __sanitizer_symbolize_pc(void *pc, const char *fmt, char *out_buf,
136                                size_t out_buf_size);
137  // Same as __sanitizer_symbolize_pc, but for data section (i.e. globals).
138  void __sanitizer_symbolize_global(void *data_ptr, const char *fmt,
139                                    char *out_buf, size_t out_buf_size);
140
141  // Sets the callback to be called right before death on error.
142  // Passing 0 will unset the callback.
143  void __sanitizer_set_death_callback(void (*callback)(void));
144
145  // Interceptor hooks.
146  // Whenever a libc function interceptor is called it checks if the
147  // corresponding weak hook is defined, and it so -- calls it.
148  // The primary use case is data-flow-guided fuzzing, where the fuzzer needs
149  // to know what is being passed to libc functions, e.g. memcmp.
150  // FIXME: implement more hooks.
151  void __sanitizer_weak_hook_memcmp(void *called_pc, const void *s1,
152                                    const void *s2, size_t n, int result);
153  void __sanitizer_weak_hook_strncmp(void *called_pc, const char *s1,
154                                    const char *s2, size_t n, int result);
155  void __sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1,
156                                         const char *s2, size_t n, int result);
157  void __sanitizer_weak_hook_strcmp(void *called_pc, const char *s1,
158                                    const char *s2, int result);
159  void __sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1,
160                                        const char *s2, int result);
161  void __sanitizer_weak_hook_strstr(void *called_pc, const char *s1,
162                                    const char *s2, char *result);
163  void __sanitizer_weak_hook_strcasestr(void *called_pc, const char *s1,
164                                        const char *s2, char *result);
165  void __sanitizer_weak_hook_memmem(void *called_pc,
166                                    const void *s1, size_t len1,
167                                    const void *s2, size_t len2, void *result);
168
169  // Prints stack traces for all live heap allocations ordered by total
170  // allocation size until `top_percent` of total live heap is shown.
171  // `top_percent` should be between 1 and 100.
172  // At most `max_number_of_contexts` contexts (stack traces) is printed.
173  // Experimental feature currently available only with asan on Linux/x86_64.
174  void __sanitizer_print_memory_profile(size_t top_percent,
175                                        size_t max_number_of_contexts);
176
177  // Fiber annotation interface.
178  // Before switching to a different stack, one must call
179  // __sanitizer_start_switch_fiber with a pointer to the bottom of the
180  // destination stack and its size. When code starts running on the new stack,
181  // it must call __sanitizer_finish_switch_fiber to finalize the switch.
182  // The start_switch function takes a void** to store the current fake stack if
183  // there is one (it is needed when detect_stack_use_after_return is enabled).
184  // When restoring a stack, this pointer must be given to the finish_switch
185  // function. In most cases, this void* can be stored on the stack just before
186  // switching.  When leaving a fiber definitely, null must be passed as first
187  // argument to the start_switch function so that the fake stack is destroyed.
188  // If you do not want support for stack use-after-return detection, you can
189  // always pass null to these two functions.
190  // Note that the fake stack mechanism is disabled during fiber switch, so if a
191  // signal callback runs during the switch, it will not benefit from the stack
192  // use-after-return detection.
193  void __sanitizer_start_switch_fiber(void **fake_stack_save,
194                                      const void *bottom, size_t size);
195  void __sanitizer_finish_switch_fiber(void *fake_stack_save,
196                                       const void **bottom_old,
197                                       size_t *size_old);
198
199  // Get full module name and calculate pc offset within it.
200  // Returns 1 if pc belongs to some module, 0 if module was not found.
201  int __sanitizer_get_module_and_offset_for_pc(void *pc, char *module_path,
202                                               size_t module_path_len,
203                                               void **pc_offset);
204
205#ifdef __cplusplus
206}  // extern "C"
207#endif
208
209#endif  // SANITIZER_COMMON_INTERFACE_DEFS_H
210