llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_linux.cc

78 lines
2.6 KiB
C++

//===-- sanitizer_procmaps_linux.cc ---------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Information about the process mappings (Linux-specific parts).
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_LINUX
#include "sanitizer_common.h"
#include "sanitizer_procmaps.h"
namespace __sanitizer {
void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
ReadFileToBuffer("/proc/self/maps", &proc_maps->data, &proc_maps->mmaped_size,
&proc_maps->len);
}
static bool IsOneOf(char c, char c1, char c2) {
return c == c1 || c == c2;
}
bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
char *last = proc_self_maps_.data + proc_self_maps_.len;
if (current_ >= last) return false;
char *next_line = (char*)internal_memchr(current_, '\n', last - current_);
if (next_line == 0)
next_line = last;
// Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar
segment->start = ParseHex(&current_);
CHECK_EQ(*current_++, '-');
segment->end = ParseHex(&current_);
CHECK_EQ(*current_++, ' ');
CHECK(IsOneOf(*current_, '-', 'r'));
segment->protection = 0;
if (*current_++ == 'r') segment->protection |= kProtectionRead;
CHECK(IsOneOf(*current_, '-', 'w'));
if (*current_++ == 'w') segment->protection |= kProtectionWrite;
CHECK(IsOneOf(*current_, '-', 'x'));
if (*current_++ == 'x') segment->protection |= kProtectionExecute;
CHECK(IsOneOf(*current_, 's', 'p'));
if (*current_++ == 's') segment->protection |= kProtectionShared;
CHECK_EQ(*current_++, ' ');
segment->offset = ParseHex(&current_);
CHECK_EQ(*current_++, ' ');
ParseHex(&current_);
CHECK_EQ(*current_++, ':');
ParseHex(&current_);
CHECK_EQ(*current_++, ' ');
while (IsDecimal(*current_))
current_++;
// Qemu may lack the trailing space.
// https://github.com/google/sanitizers/issues/160
// CHECK_EQ(*current_++, ' ');
// Skip spaces.
while (current_ < next_line && *current_ == ' ')
current_++;
// Fill in the filename.
if (segment->filename) {
uptr len = Min((uptr)(next_line - current_), segment->filename_size - 1);
internal_strncpy(segment->filename, current_, len);
segment->filename[len] = 0;
}
current_ = next_line + 1;
return true;
}
} // namespace __sanitizer
#endif // SANITIZER_LINUX