1 //===-- sanitizer_linux.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 // Linux-specific syscall wrappers and classes. 11 // 12 //===----------------------------------------------------------------------===// 13 #ifndef SANITIZER_LINUX_H 14 #define SANITIZER_LINUX_H 15 16 #include "sanitizer_platform.h" 17 #if SANITIZER_FREEBSD || SANITIZER_LINUX 18 #include "sanitizer_common.h" 19 #include "sanitizer_internal_defs.h" 20 #include "sanitizer_posix.h" 21 #include "sanitizer_platform_limits_posix.h" 22 23 struct link_map; // Opaque type returned by dlopen(). 24 struct sigaltstack; 25 26 namespace __sanitizer { 27 // Dirent structure for getdents(). Note that this structure is different from 28 // the one in <dirent.h>, which is used by readdir(). 29 struct linux_dirent; 30 31 // Syscall wrappers. 32 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count); 33 uptr internal_sigaltstack(const struct sigaltstack* ss, 34 struct sigaltstack* oss); 35 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 36 __sanitizer_sigset_t *oldset); 37 38 // Linux-only syscalls. 39 #if SANITIZER_LINUX 40 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5); 41 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used 42 // (like the process-wide error reporting SEGV handler) must use 43 // internal_sigaction instead. 44 int internal_sigaction_norestorer(int signum, const void *act, void *oldact); 45 #if defined(__x86_64__) && !SANITIZER_GO 46 // Uses a raw system call to avoid interceptors. 47 int internal_sigaction_syscall(int signum, const void *act, void *oldact); 48 #endif 49 void internal_sigdelset(__sanitizer_sigset_t *set, int signum); 50 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \ 51 || defined(__powerpc64__) || defined(__s390__) 52 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 53 int *parent_tidptr, void *newtls, int *child_tidptr); 54 #endif 55 #endif // SANITIZER_LINUX 56 57 // This class reads thread IDs from /proc/<pid>/task using only syscalls. 58 class ThreadLister { 59 public: 60 explicit ThreadLister(int pid); 61 ~ThreadLister(); 62 // GetNextTID returns -1 if the list of threads is exhausted, or if there has 63 // been an error. 64 int GetNextTID(); 65 void Reset(); 66 bool error(); 67 68 private: 69 bool GetDirectoryEntries(); 70 71 int pid_; 72 int descriptor_; 73 InternalScopedBuffer<char> buffer_; 74 bool error_; 75 struct linux_dirent* entry_; 76 int bytes_read_; 77 }; 78 79 // Exposed for testing. 80 uptr ThreadDescriptorSize(); 81 uptr ThreadSelf(); 82 uptr ThreadSelfOffset(); 83 84 // Matches a library's file name against a base name (stripping path and version 85 // information). 86 bool LibraryNameIs(const char *full_name, const char *base_name); 87 88 // Call cb for each region mapped by map. 89 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)); 90 } // namespace __sanitizer 91 92 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX 93 #endif // SANITIZER_LINUX_H 94