mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-26 00:06:06 +00:00
2523faf677
People keep asking LSan to be available on 32 bit targets (e.g. https://github.com/google/sanitizers/issues/403) despite the fact that false negative ratio might be huge (up to 85%). This happens for big real world applications that may contain random binary data (e.g. browser), but for smaller apps situation is not so terrible and LSan still might be useful. This patch adds initial support for x86 Linux (disabled by default), ARM32 is in TODO list. We used this patch (well, ported to GCC) on our 32 bit mobile emulators and it worked pretty fine thus I'm posting it here to initiate further discussion. Differential Revision: https://reviews.llvm.org/D28609 llvm-svn: 292775
94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
//===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Linux-specific syscall wrappers and classes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#ifndef SANITIZER_LINUX_H
|
|
#define SANITIZER_LINUX_H
|
|
|
|
#include "sanitizer_platform.h"
|
|
#if SANITIZER_FREEBSD || SANITIZER_LINUX
|
|
#include "sanitizer_common.h"
|
|
#include "sanitizer_internal_defs.h"
|
|
#include "sanitizer_posix.h"
|
|
#include "sanitizer_platform_limits_posix.h"
|
|
|
|
struct link_map; // Opaque type returned by dlopen().
|
|
struct sigaltstack;
|
|
|
|
namespace __sanitizer {
|
|
// Dirent structure for getdents(). Note that this structure is different from
|
|
// the one in <dirent.h>, which is used by readdir().
|
|
struct linux_dirent;
|
|
|
|
// Syscall wrappers.
|
|
uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
|
|
uptr internal_sigaltstack(const struct sigaltstack* ss,
|
|
struct sigaltstack* oss);
|
|
uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
|
|
__sanitizer_sigset_t *oldset);
|
|
|
|
// Linux-only syscalls.
|
|
#if SANITIZER_LINUX
|
|
uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
|
|
// Used only by sanitizer_stoptheworld. Signal handlers that are actually used
|
|
// (like the process-wide error reporting SEGV handler) must use
|
|
// internal_sigaction instead.
|
|
int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
|
|
#if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
|
|
// Uses a raw system call to avoid interceptors.
|
|
int internal_sigaction_syscall(int signum, const void *act, void *oldact);
|
|
#endif
|
|
void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
|
|
#if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
|
|
|| defined(__powerpc64__) || defined(__s390__) || defined(__i386__)
|
|
uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
int *parent_tidptr, void *newtls, int *child_tidptr);
|
|
#endif
|
|
#endif // SANITIZER_LINUX
|
|
|
|
// This class reads thread IDs from /proc/<pid>/task using only syscalls.
|
|
class ThreadLister {
|
|
public:
|
|
explicit ThreadLister(int pid);
|
|
~ThreadLister();
|
|
// GetNextTID returns -1 if the list of threads is exhausted, or if there has
|
|
// been an error.
|
|
int GetNextTID();
|
|
void Reset();
|
|
bool error();
|
|
|
|
private:
|
|
bool GetDirectoryEntries();
|
|
|
|
int pid_;
|
|
int descriptor_;
|
|
InternalScopedBuffer<char> buffer_;
|
|
bool error_;
|
|
struct linux_dirent* entry_;
|
|
int bytes_read_;
|
|
};
|
|
|
|
// Exposed for testing.
|
|
uptr ThreadDescriptorSize();
|
|
uptr ThreadSelf();
|
|
uptr ThreadSelfOffset();
|
|
|
|
// Matches a library's file name against a base name (stripping path and version
|
|
// information).
|
|
bool LibraryNameIs(const char *full_name, const char *base_name);
|
|
|
|
// Call cb for each region mapped by map.
|
|
void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
|
|
} // namespace __sanitizer
|
|
|
|
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX
|
|
#endif // SANITIZER_LINUX_H
|