1 //===-- options.inc ---------------------------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #ifndef GWP_ASAN_OPTION
10 #error "Define GWP_ASAN_OPTION prior to including this file!"
13 GWP_ASAN_OPTION(bool, Enabled, true, "Is GWP-ASan enabled? Defaults to true.")
16 bool, PerfectlyRightAlign, false,
17 "When allocations are right-aligned, should we perfectly align them up to "
18 "the page boundary? By default (false), we round up allocation size to the "
19 "nearest power of two (1, 2, 4, 8, 16) up to a maximum of 16-byte "
20 "alignment for performance reasons. For Bionic, we use 8-byte alignment by "
21 "default. Setting this to true can find single byte buffer-overflows for "
22 "multibyte allocations at the cost of performance, and may be incompatible "
23 "with some architectures.")
25 GWP_ASAN_OPTION(int, MaxSimultaneousAllocations, 16,
26 "Number of simultaneously-guarded allocations available in the "
27 "pool. Defaults to 16.")
29 GWP_ASAN_OPTION(int, SampleRate, 5000,
30 "The probability (1 / SampleRate) that an allocation is "
31 "selected for GWP-ASan sampling. Default is 5000. Sample rates "
32 "up to (2^31 - 1) are supported.")
34 // Developer note - This option is not actually processed by GWP-ASan itself. It
35 // is included here so that a user can specify whether they want signal handlers
36 // or not. The supporting allocator should inspect this value to see whether
37 // signal handlers need to be installed, and then use
38 // crash_handler::installSignalHandlers() in order to install the handlers. Note
39 // that in order to support signal handlers, you will need to link against the
40 // optional crash_handler component.
42 bool, InstallSignalHandlers, true,
43 "Install GWP-ASan signal handlers for SIGSEGV during dynamic loading. This "
44 "allows better error reports by providing stack traces for allocation and "
45 "deallocation when reporting a memory error. GWP-ASan's signal handler "
46 "will forward the signal to any previously-installed handler, and user "
47 "programs that install further signal handlers should make sure they do "
48 "the same. Note, if the previously installed SIGSEGV handler is SIG_IGN, "
49 "we terminate the process after dumping the error report.")
51 GWP_ASAN_OPTION(bool, InstallForkHandlers, true,
52 "Install GWP-ASan atfork handlers to acquire internal locks "
53 "before fork and release them after.")