}
}
-// On Linux, handles dynamically allocated TLS blocks by treating all chunks
-// allocated from ld-linux.so as reachable.
+// On Linux, treats all chunks allocated from ld-linux.so as reachable, which
+// covers dynamically allocated TLS blocks, internal dynamic loader's loaded
+// modules accounting etc.
// Dynamic TLS blocks contain the TLS variables of dynamically loaded modules.
// They are allocated with a __libc_memalign() call in allocate_and_init()
// (elf/dl-tls.c). Glibc won't tell us the address ranges occupied by those
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_getauxval.h"
#include "sanitizer_common/sanitizer_linux.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
static char linker_placeholder[sizeof(LoadedModule)] ALIGNED(64);
static LoadedModule *linker = nullptr;
-static bool IsLinker(const char* full_name) {
- return LibraryNameIs(full_name, kLinkerName);
+static bool IsLinker(const LoadedModule& module) {
+#if SANITIZER_USE_GETAUXVAL
+ return module.base_address() == getauxval(AT_BASE);
+#else
+ return LibraryNameIs(module.full_name(), kLinkerName);
+#endif // SANITIZER_USE_GETAUXVAL
}
__attribute__((tls_model("initial-exec")))
ListOfModules modules;
modules.init();
for (LoadedModule &module : modules) {
- if (!IsLinker(module.full_name())) continue;
+ if (!IsLinker(module))
+ continue;
if (linker == nullptr) {
linker = reinterpret_cast<LoadedModule *>(linker_placeholder);
*linker = module;
module = LoadedModule();
} else {
VReport(1, "LeakSanitizer: Multiple modules match \"%s\". "
- "TLS will not be handled correctly.\n", kLinkerName);
+ "TLS and other allocations originating from linker might be "
+ "falsely reported as leaks.\n", kLinkerName);
linker->clear();
linker = nullptr;
return;
}
}
if (linker == nullptr) {
- VReport(1, "LeakSanitizer: Dynamic linker not found. "
- "TLS will not be handled correctly.\n");
+ VReport(1, "LeakSanitizer: Dynamic linker not found. TLS and other "
+ "allocations originating from linker might be falsely reported "
+ "as leaks.\n");
}
}
--- /dev/null
+//===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Common getauxval() guards and definitions.
+// getauxval() is not defined until glbc version 2.16.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_GETAUXVAL_H
+#define SANITIZER_GETAUXVAL_H
+
+#include "sanitizer_platform.h"
+
+#if SANITIZER_LINUX
+
+#include <features.h>
+
+#ifndef __GLIBC_PREREQ
+#define __GLIBC_PREREQ(x, y) 0
+#endif
+
+#if __GLIBC_PREREQ(2, 16)
+# define SANITIZER_USE_GETAUXVAL 1
+#else
+# define SANITIZER_USE_GETAUXVAL 0
+#endif
+
+#if SANITIZER_USE_GETAUXVAL
+#include <sys/auxv.h>
+#endif
+
+#endif // SANITIZER_LINUX
+
+#endif // SANITIZER_GETAUXVAL_H
#include "sanitizer_common.h"
#include "sanitizer_flags.h"
+#include "sanitizer_getauxval.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
#include "sanitizer_linux.h"
#include <sys/signal.h>
#endif
-#ifndef __GLIBC_PREREQ
-#define __GLIBC_PREREQ(x, y) 0
-#endif
-
-#if SANITIZER_LINUX && __GLIBC_PREREQ(2, 16)
-# define SANITIZER_USE_GETAUXVAL 1
-#else
-# define SANITIZER_USE_GETAUXVAL 0
-#endif
-
-#if SANITIZER_USE_GETAUXVAL
-#include <sys/auxv.h>
-#endif
-
#if SANITIZER_LINUX
// <linux/time.h>
struct kernel_timeval {