|
111
|
1 //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
|
|
|
2 //
|
|
145
|
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
|
|
111
|
6 //
|
|
|
7 //===----------------------------------------------------------------------===//
|
|
|
8 //
|
|
|
9 // Linux-specific syscall wrappers and classes.
|
|
|
10 //
|
|
|
11 //===----------------------------------------------------------------------===//
|
|
|
12 #ifndef SANITIZER_LINUX_H
|
|
|
13 #define SANITIZER_LINUX_H
|
|
|
14
|
|
|
15 #include "sanitizer_platform.h"
|
|
145
|
16 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
|
|
|
17 SANITIZER_OPENBSD || SANITIZER_SOLARIS
|
|
111
|
18 #include "sanitizer_common.h"
|
|
|
19 #include "sanitizer_internal_defs.h"
|
|
145
|
20 #include "sanitizer_platform_limits_freebsd.h"
|
|
111
|
21 #include "sanitizer_platform_limits_netbsd.h"
|
|
145
|
22 #include "sanitizer_platform_limits_openbsd.h"
|
|
111
|
23 #include "sanitizer_platform_limits_posix.h"
|
|
145
|
24 #include "sanitizer_platform_limits_solaris.h"
|
|
111
|
25 #include "sanitizer_posix.h"
|
|
|
26
|
|
|
27 struct link_map; // Opaque type returned by dlopen().
|
|
|
28
|
|
|
29 namespace __sanitizer {
|
|
|
30 // Dirent structure for getdents(). Note that this structure is different from
|
|
|
31 // the one in <dirent.h>, which is used by readdir().
|
|
|
32 struct linux_dirent;
|
|
|
33
|
|
|
34 struct ProcSelfMapsBuff {
|
|
|
35 char *data;
|
|
|
36 uptr mmaped_size;
|
|
|
37 uptr len;
|
|
|
38 };
|
|
|
39
|
|
|
40 struct MemoryMappingLayoutData {
|
|
|
41 ProcSelfMapsBuff proc_self_maps;
|
|
|
42 const char *current;
|
|
|
43 };
|
|
|
44
|
|
|
45 void ReadProcMaps(ProcSelfMapsBuff *proc_maps);
|
|
|
46
|
|
|
47 // Syscall wrappers.
|
|
|
48 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
|
|
|
49 uptr internal_sigaltstack(const void* ss, void* oss);
|
|
|
50 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
|
|
|
51 __sanitizer_sigset_t *oldset);
|
|
145
|
52 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp);
|
|
111
|
53
|
|
|
54 // Linux-only syscalls.
|
|
|
55 #if SANITIZER_LINUX
|
|
|
56 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
|
|
|
57 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used
|
|
|
58 // (like the process-wide error reporting SEGV handler) must use
|
|
|
59 // internal_sigaction instead.
|
|
|
60 int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
|
|
|
61 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
|
|
|
62 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
|
|
|
63 || defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \
|
|
|
64 || defined(__arm__)
|
|
|
65 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
66 int *parent_tidptr, void *newtls, int *child_tidptr);
|
|
|
67 #endif
|
|
145
|
68 #elif SANITIZER_FREEBSD
|
|
|
69 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
|
|
|
70 #elif SANITIZER_NETBSD
|
|
|
71 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
|
|
|
72 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg);
|
|
111
|
73 #endif // SANITIZER_LINUX
|
|
|
74
|
|
|
75 // This class reads thread IDs from /proc/<pid>/task using only syscalls.
|
|
|
76 class ThreadLister {
|
|
|
77 public:
|
|
145
|
78 explicit ThreadLister(pid_t pid);
|
|
111
|
79 ~ThreadLister();
|
|
145
|
80 enum Result {
|
|
|
81 Error,
|
|
|
82 Incomplete,
|
|
|
83 Ok,
|
|
|
84 };
|
|
|
85 Result ListThreads(InternalMmapVector<tid_t> *threads);
|
|
111
|
86
|
|
|
87 private:
|
|
145
|
88 bool IsAlive(int tid);
|
|
111
|
89
|
|
145
|
90 pid_t pid_;
|
|
|
91 int descriptor_ = -1;
|
|
|
92 InternalMmapVector<char> buffer_;
|
|
111
|
93 };
|
|
|
94
|
|
|
95 // Exposed for testing.
|
|
|
96 uptr ThreadDescriptorSize();
|
|
|
97 uptr ThreadSelf();
|
|
|
98 uptr ThreadSelfOffset();
|
|
|
99
|
|
|
100 // Matches a library's file name against a base name (stripping path and version
|
|
|
101 // information).
|
|
|
102 bool LibraryNameIs(const char *full_name, const char *base_name);
|
|
|
103
|
|
|
104 // Call cb for each region mapped by map.
|
|
|
105 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
|
|
|
106
|
|
145
|
107 // Releases memory pages entirely within the [beg, end] address range.
|
|
|
108 // The pages no longer count toward RSS; reads are guaranteed to return 0.
|
|
|
109 // Requires (but does not verify!) that pages are MAP_PRIVATE.
|
|
|
110 INLINE void ReleaseMemoryPagesToOSAndZeroFill(uptr beg, uptr end) {
|
|
|
111 // man madvise on Linux promises zero-fill for anonymous private pages.
|
|
|
112 // Testing shows the same behaviour for private (but not anonymous) mappings
|
|
|
113 // of shm_open() files, as long as the underlying file is untouched.
|
|
|
114 CHECK(SANITIZER_LINUX);
|
|
|
115 ReleaseMemoryPagesToOS(beg, end);
|
|
|
116 }
|
|
|
117
|
|
111
|
118 #if SANITIZER_ANDROID
|
|
|
119
|
|
|
120 #if defined(__aarch64__)
|
|
|
121 # define __get_tls() \
|
|
|
122 ({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
|
|
|
123 #elif defined(__arm__)
|
|
|
124 # define __get_tls() \
|
|
|
125 ({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
|
|
|
126 #elif defined(__mips__)
|
|
|
127 // On mips32r1, this goes via a kernel illegal instruction trap that's
|
|
|
128 // optimized for v1.
|
|
|
129 # define __get_tls() \
|
|
|
130 ({ register void** __v asm("v1"); \
|
|
|
131 __asm__(".set push\n" \
|
|
|
132 ".set mips32r2\n" \
|
|
|
133 "rdhwr %0,$29\n" \
|
|
|
134 ".set pop\n" : "=r"(__v)); \
|
|
|
135 __v; })
|
|
|
136 #elif defined(__i386__)
|
|
|
137 # define __get_tls() \
|
|
|
138 ({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
|
|
|
139 #elif defined(__x86_64__)
|
|
|
140 # define __get_tls() \
|
|
|
141 ({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
|
|
|
142 #else
|
|
|
143 #error "Unsupported architecture."
|
|
|
144 #endif
|
|
|
145
|
|
145
|
146 // The Android Bionic team has allocated a TLS slot for sanitizers starting
|
|
|
147 // with Q, given that Android currently doesn't support ELF TLS. It is used to
|
|
|
148 // store sanitizer thread specific data.
|
|
|
149 static const int TLS_SLOT_SANITIZER = 6;
|
|
111
|
150
|
|
|
151 ALWAYS_INLINE uptr *get_android_tls_ptr() {
|
|
145
|
152 return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_SANITIZER]);
|
|
111
|
153 }
|
|
|
154
|
|
|
155 #endif // SANITIZER_ANDROID
|
|
|
156
|
|
|
157 } // namespace __sanitizer
|
|
|
158
|
|
145
|
159 #endif
|
|
111
|
160 #endif // SANITIZER_LINUX_H
|
