1 //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===// 2 // 3 // This file is distributed under the University of Illinois Open Source 4 // License. See LICENSE.TXT for details. 5 // 6 //===----------------------------------------------------------------------===// 7 // 8 // Linux-specific syscall wrappers and classes. 9 // 10 //===----------------------------------------------------------------------===// 11 #ifndef SANITIZER_LINUX_H 12 #define SANITIZER_LINUX_H 13 14 #include "sanitizer_platform.h" 15 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 16 #include "sanitizer_common.h" 17 #include "sanitizer_internal_defs.h" 18 #include "sanitizer_posix.h" 19 #include "sanitizer_platform_limits_posix.h" 20 21 struct link_map; // Opaque type returned by dlopen(). 22 23 namespace __sanitizer { 24 // Dirent structure for getdents(). Note that this structure is different from 25 // the one in <dirent.h>, which is used by readdir(). 26 struct linux_dirent; 27 28 // Syscall wrappers. 29 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count); 30 uptr internal_sigaltstack(const void* ss, void* oss); 31 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 32 __sanitizer_sigset_t *oldset); 33 34 // Linux-only syscalls. 35 #if SANITIZER_LINUX 36 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5); 37 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used 38 // (like the process-wide error reporting SEGV handler) must use 39 // internal_sigaction instead. 40 int internal_sigaction_norestorer(int signum, const void *act, void *oldact); 41 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO 42 // Uses a raw system call to avoid interceptors. 43 int internal_sigaction_syscall(int signum, const void *act, void *oldact); 44 #endif 45 void internal_sigdelset(__sanitizer_sigset_t *set, int signum); 46 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \ 47 || defined(__powerpc64__) || defined(__s390__) 48 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 49 int *parent_tidptr, void *newtls, int *child_tidptr); 50 #endif 51 #endif // SANITIZER_LINUX 52 53 #ifdef SANITIZER_NETBSD 54 int internal_sigaction_norestorer(int signum, const void *act, void *oldact); 55 #define internal_sigdelset(set, signum) \ 56 __sigdelset(set, signum) 57 #define internal_clone(fn, child_stack, flags, arg, \ 58 parent_tidptr, newtls, child_tidptr) \ 59 __clone(fn, child_stack, flags, arg) 60 #endif 61 62 // This class reads thread IDs from /proc/<pid>/task using only syscalls. 63 class ThreadLister { 64 public: 65 explicit ThreadLister(int pid); 66 ~ThreadLister(); 67 // GetNextTID returns -1 if the list of threads is exhausted, or if there has 68 // been an error. 69 int GetNextTID(); 70 void Reset(); 71 bool error(); 72 73 private: 74 bool GetDirectoryEntries(); 75 76 int pid_; 77 int descriptor_; 78 InternalScopedBuffer<char> buffer_; 79 bool error_; 80 struct linux_dirent* entry_; 81 int bytes_read_; 82 }; 83 84 // Exposed for testing. 85 uptr ThreadDescriptorSize(); 86 uptr ThreadSelf(); 87 uptr ThreadSelfOffset(); 88 89 // Matches a library's file name against a base name (stripping path and version 90 // information). 91 bool LibraryNameIs(const char *full_name, const char *base_name); 92 93 // Call cb for each region mapped by map. 94 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)); 95 } // namespace __sanitizer 96 97 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 98 #endif // SANITIZER_LINUX_H 99