diff options
| -rw-r--r-- | compiler-rt/lib/sanitizer_common/sanitizer_linux.cc | 39 | ||||
| -rw-r--r-- | compiler-rt/lib/sanitizer_common/sanitizer_posix.cc | 39 |
2 files changed, 39 insertions, 39 deletions
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc index 355d581f272..71bad466325 100644 --- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc +++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc @@ -815,6 +815,45 @@ bool ThreadLister::GetDirectoryEntries() { return true; } +#if SANITIZER_WORDSIZE == 32 +// Take care of unusable kernel area in top gigabyte. +static uptr GetKernelAreaSize() { +#if SANITIZER_LINUX && !SANITIZER_X32 + const uptr gbyte = 1UL << 30; + + // Firstly check if there are writable segments + // mapped to top gigabyte (e.g. stack). + MemoryMappingLayout proc_maps(/*cache_enabled*/true); + uptr end, prot; + while (proc_maps.Next(/*start*/nullptr, &end, + /*offset*/nullptr, /*filename*/nullptr, + /*filename_size*/0, &prot)) { + if ((end >= 3 * gbyte) + && (prot & MemoryMappingLayout::kProtectionWrite) != 0) + return 0; + } + +#if !SANITIZER_ANDROID + // Even if nothing is mapped, top Gb may still be accessible + // if we are running on 64-bit kernel. + // Uname may report misleading results if personality type + // is modified (e.g. under schroot) so check this as well. + struct utsname uname_info; + int pers = personality(0xffffffffUL); + if (!(pers & PER_MASK) + && uname(&uname_info) == 0 + && internal_strstr(uname_info.machine, "64")) + return 0; +#endif // SANITIZER_ANDROID + + // Top gigabyte is reserved for kernel. + return gbyte; +#else + return 0; +#endif // SANITIZER_LINUX && !SANITIZER_X32 +} +#endif // SANITIZER_WORDSIZE == 32 + uptr GetMaxVirtualAddress() { #if SANITIZER_WORDSIZE == 64 # if defined(__powerpc64__) || defined(__aarch64__) diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc b/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc index d41f16c9418..7841b246fa3 100644 --- a/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc +++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc @@ -49,45 +49,6 @@ uptr GetMmapGranularity() { return GetPageSize(); } -#if SANITIZER_WORDSIZE == 32 -// Take care of unusable kernel area in top gigabyte. -static uptr GetKernelAreaSize() { -#if SANITIZER_LINUX && !SANITIZER_X32 - const uptr gbyte = 1UL << 30; - - // Firstly check if there are writable segments - // mapped to top gigabyte (e.g. stack). - MemoryMappingLayout proc_maps(/*cache_enabled*/true); - uptr end, prot; - while (proc_maps.Next(/*start*/nullptr, &end, - /*offset*/nullptr, /*filename*/nullptr, - /*filename_size*/0, &prot)) { - if ((end >= 3 * gbyte) - && (prot & MemoryMappingLayout::kProtectionWrite) != 0) - return 0; - } - -#if !SANITIZER_ANDROID - // Even if nothing is mapped, top Gb may still be accessible - // if we are running on 64-bit kernel. - // Uname may report misleading results if personality type - // is modified (e.g. under schroot) so check this as well. - struct utsname uname_info; - int pers = personality(0xffffffffUL); - if (!(pers & PER_MASK) - && uname(&uname_info) == 0 - && internal_strstr(uname_info.machine, "64")) - return 0; -#endif // SANITIZER_ANDROID - - // Top gigabyte is reserved for kernel. - return gbyte; -#else - return 0; -#endif // SANITIZER_LINUX && !SANITIZER_X32 -} -#endif // SANITIZER_WORDSIZE == 32 - void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) { size = RoundUpTo(size, GetPageSizeCached()); uptr res = internal_mmap(nullptr, size, |
