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Ty Baen-Price explains: > Problem and Resolution: > The following lines of code make use of the Microsoft API ExitProcess: > > ``` > Apps\Speed.c line 335: ExitProcess(ret); > Ms\uplink.c line 22: ExitProcess(1); > ``` > > These function calls are made after fatal errors are detected and > program termination is desired. ExitProcess(), however causes > _orderly_ shutdown of a process and all its threads, i.e. it unloads > all dlls and runs all destructors. See MSDN for details of exactly > what happens > (https://msdn.microsoft.com/en-us/library/windows/desktop/ms682658(v=vs.85).aspx). > The MSDN page states that ExitProcess should never be called unless > it is _known to be safe_ to call it. These calls should simply be > replaced with calls to TerminateProcess(), which is what should be > called for _disorderly_ shutdown. > > An example of usage: > > ``` > TerminateProcess(GetCurrentProcess(), exitcode); > ``` > > Effect of Problem: > Because of a compilation error (wrong c++ runtime), my program > executed the uplink.c ExitProcess() call. This caused the single > OpenSSL thread to start executing the destructors of all my dlls, > and their objects. Unfortunately, about 30 other threads were > happily using those objects at that time, eventually causing a > 0xC0000005 ACCESS_VIOLATION. Obviously an ACCESS_VIOLATION is the > best case scenario, as I'm sure you can imagine at the consequences > of undiscovered memory corruption, even in a terminating process. And on the subject of `TerminateProcess()` being asynchronous: > That is technically true, but I think it's probably synchronous > "enough" for your purposes, since a call to TerminateProcess > suspends execution of all threads in the target process. This means > it's really only asynchronous if you're calling TerminateProcess one > some _other_ process. If you're calling TerminateProcess on your own > process, you'll never return from the TerminateProcess call. Fixes #2489 Was originally RT-4526 Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8301) |
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OpenSSL 3.0.0-dev
Copyright (c) 1998-2018 The OpenSSL Project
Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
All rights reserved.
DESCRIPTION
-----------
The OpenSSL Project is a collaborative effort to develop a robust,
commercial-grade, fully featured, and Open Source toolkit implementing the
Transport Layer Security (TLS) protocols (including SSLv3) as well as a
full-strength general purpose cryptographic library.
OpenSSL is descended from the SSLeay library developed by Eric A. Young
and Tim J. Hudson.
The OpenSSL toolkit is licensed under the Apache License 2.0, which means
that you are free to get and use it for commercial and non-commercial
purposes as long as you fulfill its conditions.
OVERVIEW
--------
The OpenSSL toolkit includes:
libssl (with platform specific naming):
Provides the client and server-side implementations for SSLv3 and TLS.
libcrypto (with platform specific naming):
Provides general cryptographic and X.509 support needed by SSL/TLS but
not logically part of it.
openssl:
A command line tool that can be used for:
Creation of key parameters
Creation of X.509 certificates, CSRs and CRLs
Calculation of message digests
Encryption and decryption
SSL/TLS client and server tests
Handling of S/MIME signed or encrypted mail
And more...
INSTALLATION
------------
See the appropriate file:
INSTALL Linux, Unix, Windows, OpenVMS, ...
NOTES.* INSTALL addendums for different platforms
SUPPORT
-------
See the OpenSSL website www.openssl.org for details on how to obtain
commercial technical support. Free community support is available through the
openssl-users email list (see
https://www.openssl.org/community/mailinglists.html for further details).
If you have any problems with OpenSSL then please take the following steps
first:
- Download the latest version from the repository
to see if the problem has already been addressed
- Configure with no-asm
- Remove compiler optimization flags
If you wish to report a bug then please include the following information
and create an issue on GitHub:
- OpenSSL version: output of 'openssl version -a'
- Configuration data: output of 'perl configdata.pm --dump'
- OS Name, Version, Hardware platform
- Compiler Details (name, version)
- Application Details (name, version)
- Problem Description (steps that will reproduce the problem, if known)
- Stack Traceback (if the application dumps core)
Just because something doesn't work the way you expect does not mean it
is necessarily a bug in OpenSSL. Use the openssl-users email list for this type
of query.
HOW TO CONTRIBUTE TO OpenSSL
----------------------------
See CONTRIBUTING
LEGALITIES
----------
A number of nations restrict the use or export of cryptography. If you
are potentially subject to such restrictions you should seek competent
professional legal advice before attempting to develop or distribute
cryptographic code.