79 lines
2.5 KiB
ReStructuredText
79 lines
2.5 KiB
ReStructuredText
===========================
|
|
Sanitizer special case list
|
|
===========================
|
|
|
|
.. contents::
|
|
:local:
|
|
|
|
Introduction
|
|
============
|
|
|
|
This document describes the way to disable or alter the behavior of
|
|
sanitizer tools for certain source-level entities by providing a special
|
|
file at compile-time.
|
|
|
|
Goal and usage
|
|
==============
|
|
|
|
User of sanitizer tools, such as :doc:`AddressSanitizer`, :doc:`ThreadSanitizer`
|
|
or :doc:`MemorySanitizer` may want to disable or alter some checks for
|
|
certain source-level entities to:
|
|
|
|
* speedup hot function, which is known to be correct;
|
|
* ignore a function that does some low-level magic (e.g. walks through the
|
|
thread stack, bypassing the frame boundaries);
|
|
* ignore a known problem.
|
|
|
|
To achieve this, user may create a file listing the entities he wants to
|
|
ignore, and pass it to clang at compile-time using
|
|
``-fsanitize-blacklist`` flag. See :doc:`UsersManual` for details.
|
|
|
|
Example
|
|
=======
|
|
|
|
.. code-block:: bash
|
|
|
|
$ cat foo.c
|
|
#include <stdlib.h>
|
|
void bad_foo() {
|
|
int *a = (int*)malloc(40);
|
|
a[10] = 1;
|
|
}
|
|
int main() { bad_foo(); }
|
|
$ cat blacklist.txt
|
|
# Ignore reports from bad_foo function.
|
|
fun:bad_foo
|
|
$ clang -fsanitize=address foo.c ; ./a.out
|
|
# AddressSanitizer prints an error report.
|
|
$ clang -fsanitize=address -fsanitize-blacklist=blacklist.txt foo.c ; ./a.out
|
|
# No error report here.
|
|
|
|
Format
|
|
======
|
|
|
|
Each line contains an entity type, followed by a colon and a regular
|
|
expression, specifying the names of the entities, optionally followed by
|
|
an equals sign and a tool-specific category. Empty lines and lines starting
|
|
with "#" are ignored. The meanining of ``*`` in regular expression for entity
|
|
names is different - it is treated as in shell wildcarding. Two generic
|
|
entity types are ``src`` and ``fun``, which allow user to add, respectively,
|
|
source files and functions to special case list. Some sanitizer tools may
|
|
introduce custom entity types - refer to tool-specific docs.
|
|
|
|
.. code-block:: bash
|
|
|
|
# Lines starting with # are ignored.
|
|
# Turn off checks for the source file (use absolute path or path relative
|
|
# to the current working directory):
|
|
src:/path/to/source/file.c
|
|
# Turn off checks for a particular functions (use mangled names):
|
|
fun:MyFooBar
|
|
fun:_Z8MyFooBarv
|
|
# Extended regular expressions are supported:
|
|
fun:bad_(foo|bar)
|
|
src:bad_source[1-9].c
|
|
# Shell like usage of * is supported (* is treated as .*):
|
|
src:bad/sources/*
|
|
fun:*BadFunction*
|
|
# Specific sanitizer tools may introduce categories.
|
|
src:/special/path/*=special_sources
|