forked from OSchip/llvm-project
124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
//===-- sanitizer_procmaps.h ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer.
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//
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// Information about the process mappings.
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_PROCMAPS_H
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#define SANITIZER_PROCMAPS_H
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_mutex.h"
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namespace __sanitizer {
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#ifdef _WIN32
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class MemoryMappingLayout {
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public:
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MemoryMappingLayout() {}
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bool GetObjectNameAndOffset(uptr addr, uptr *offset,
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char filename[], uptr filename_size,
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uptr *protection) {
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UNIMPLEMENTED();
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}
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};
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#else // _WIN32
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#if defined(__linux__)
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struct ProcSelfMapsBuff {
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char *data;
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uptr mmaped_size;
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uptr len;
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};
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#endif // defined(__linux__)
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class MemoryMappingLayout {
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public:
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MemoryMappingLayout();
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bool Next(uptr *start, uptr *end, uptr *offset,
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char filename[], uptr filename_size, uptr *protection);
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void Reset();
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// Gets the object file name and the offset in that object for a given
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// address 'addr'. Returns true on success.
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bool GetObjectNameAndOffset(uptr addr, uptr *offset,
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char filename[], uptr filename_size,
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uptr *protection);
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// In some cases, e.g. when running under a sandbox on Linux, ASan is unable
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// to obtain the memory mappings. It should fall back to pre-cached data
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// instead of aborting.
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static void CacheMemoryMappings();
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~MemoryMappingLayout();
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// Memory protection masks.
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static const uptr kProtectionRead = 1;
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static const uptr kProtectionWrite = 2;
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static const uptr kProtectionExecute = 4;
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static const uptr kProtectionShared = 8;
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private:
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void LoadFromCache();
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// Default implementation of GetObjectNameAndOffset.
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// Quite slow, because it iterates through the whole process map for each
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// lookup.
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bool IterateForObjectNameAndOffset(uptr addr, uptr *offset,
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char filename[], uptr filename_size,
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uptr *protection) {
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Reset();
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uptr start, end, file_offset;
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for (int i = 0; Next(&start, &end, &file_offset, filename, filename_size,
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protection);
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i++) {
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if (addr >= start && addr < end) {
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// Don't subtract 'start' for the first entry:
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// * If a binary is compiled w/o -pie, then the first entry in
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// process maps is likely the binary itself (all dynamic libs
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// are mapped higher in address space). For such a binary,
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// instruction offset in binary coincides with the actual
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// instruction address in virtual memory (as code section
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// is mapped to a fixed memory range).
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// * If a binary is compiled with -pie, all the modules are
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// mapped high at address space (in particular, higher than
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// shadow memory of the tool), so the module can't be the
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// first entry.
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*offset = (addr - (i ? start : 0)) + file_offset;
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return true;
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}
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}
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if (filename_size)
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filename[0] = '\0';
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return false;
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}
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# if defined __linux__
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ProcSelfMapsBuff proc_self_maps_;
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char *current_;
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// Static mappings cache.
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static ProcSelfMapsBuff cached_proc_self_maps_;
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static StaticSpinMutex cache_lock_; // protects cached_proc_self_maps_.
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# elif defined __APPLE__
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template<u32 kLCSegment, typename SegmentCommand>
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bool NextSegmentLoad(uptr *start, uptr *end, uptr *offset,
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char filename[], uptr filename_size,
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uptr *protection);
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int current_image_;
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u32 current_magic_;
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u32 current_filetype_;
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int current_load_cmd_count_;
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char *current_load_cmd_addr_;
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# endif
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};
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#endif // _WIN32
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} // namespace __sanitizer
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#endif // SANITIZER_PROCMAPS_H
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