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//===-- sanitizer_procmaps_linux.cpp --------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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) {
if (!ReadFileToBuffer("/proc/self/maps", &proc_maps->data,
&proc_maps->mmaped_size, &proc_maps->len)) {
proc_maps->data = nullptr;
proc_maps->mmaped_size = 0;
proc_maps->len = 0;
}
}
static bool IsOneOf(char c, char c1, char c2) {
return c == c1 || c == c2;
}
bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
if (Error()) return false; // simulate empty maps
char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
if (data_.current >= last) return false;
char *next_line =
(char *)internal_memchr(data_.current, '\n', last - data_.current);
if (next_line == 0)
next_line = last;
// Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar
segment->start = ParseHex(&data_.current);
CHECK_EQ(*data_.current++, '-');
segment->end = ParseHex(&data_.current);
CHECK_EQ(*data_.current++, ' ');
CHECK(IsOneOf(*data_.current, '-', 'r'));
segment->protection = 0;
if (*data_.current++ == 'r') segment->protection |= kProtectionRead;
CHECK(IsOneOf(*data_.current, '-', 'w'));
if (*data_.current++ == 'w') segment->protection |= kProtectionWrite;
CHECK(IsOneOf(*data_.current, '-', 'x'));
if (*data_.current++ == 'x') segment->protection |= kProtectionExecute;
CHECK(IsOneOf(*data_.current, 's', 'p'));
if (*data_.current++ == 's') segment->protection |= kProtectionShared;
CHECK_EQ(*data_.current++, ' ');
segment->offset = ParseHex(&data_.current);
CHECK_EQ(*data_.current++, ' ');
ParseHex(&data_.current);
CHECK_EQ(*data_.current++, ':');
ParseHex(&data_.current);
CHECK_EQ(*data_.current++, ' ');
while (IsDecimal(*data_.current)) data_.current++;
// Qemu may lack the trailing space.
// https://github.com/google/sanitizers/issues/160
// CHECK_EQ(*data_.current++, ' ');
// Skip spaces.
while (data_.current < next_line && *data_.current == ' ') data_.current++;
// Fill in the filename.
if (segment->filename) {
uptr len =
Min((uptr)(next_line - data_.current), segment->filename_size - 1);
internal_strncpy(segment->filename, data_.current, len);
segment->filename[len] = 0;
}
data_.current = next_line + 1;
return true;
}
} // namespace __sanitizer
#endif // SANITIZER_LINUX
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