1 //===-- sanitizer_procmaps_freebsd.cc -------------------------------------===// 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 // Information about the process mappings (FreeBSD-specific parts). 11 //===----------------------------------------------------------------------===// 12 13 #include "sanitizer_platform.h" 14 #if SANITIZER_FREEBSD 15 #include "sanitizer_common.h" 16 #include "sanitizer_freebsd.h" 17 #include "sanitizer_procmaps.h" 18 19 #include <unistd.h> 20 #include <sys/sysctl.h> 21 #include <sys/user.h> 22 23 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode. 24 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32) 25 # include <osreldate.h> 26 # if __FreeBSD_version <= 902001 // v9.2 27 # define kinfo_vmentry xkinfo_vmentry 28 # endif 29 #endif 30 31 namespace __sanitizer { 32 33 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) { 34 const int Mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, getpid() }; 35 size_t Size = 0; 36 int Err = sysctl(Mib, 4, NULL, &Size, NULL, 0); 37 CHECK_EQ(Err, 0); 38 CHECK_GT(Size, 0); 39 40 size_t MmapedSize = Size * 4 / 3; 41 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()"); 42 Size = MmapedSize; 43 Err = sysctl(Mib, 4, VmMap, &Size, NULL, 0); 44 CHECK_EQ(Err, 0); 45 46 proc_maps->data = (char*)VmMap; 47 proc_maps->mmaped_size = MmapedSize; 48 proc_maps->len = Size; 49 } 50 51 bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset, 52 char filename[], uptr filename_size, 53 uptr *protection) { 54 char *last = proc_self_maps_.data + proc_self_maps_.len; 55 if (current_ >= last) return false; 56 uptr dummy; 57 if (!start) start = &dummy; 58 if (!end) end = &dummy; 59 if (!offset) offset = &dummy; 60 if (!protection) protection = &dummy; 61 struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry*)current_; 62 63 *start = (uptr)VmEntry->kve_start; 64 *end = (uptr)VmEntry->kve_end; 65 *offset = (uptr)VmEntry->kve_offset; 66 67 *protection = 0; 68 if ((VmEntry->kve_protection & KVME_PROT_READ) != 0) 69 *protection |= kProtectionRead; 70 if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0) 71 *protection |= kProtectionWrite; 72 if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0) 73 *protection |= kProtectionExecute; 74 75 if (filename != NULL && filename_size > 0) { 76 internal_snprintf(filename, 77 Min(filename_size, (uptr)PATH_MAX), 78 "%s", VmEntry->kve_path); 79 } 80 81 current_ += VmEntry->kve_structsize; 82 83 return true; 84 } 85 86 } // namespace __sanitizer 87 88 #endif // SANITIZER_FREEBSD 89
