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-rw-r--r--lib/sanitizer_common/sanitizer_procmaps_linux.cpp81
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_procmaps_linux.cpp b/lib/sanitizer_common/sanitizer_procmaps_linux.cpp
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+++ b/lib/sanitizer_common/sanitizer_procmaps_linux.cpp
@@ -0,0 +1,81 @@
+//===-- 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