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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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| .. | ||
| applink.c | ||
| cmp.pl | ||
| uplink-common.pl | ||
| uplink-ia64.pl | ||
| uplink-x86_64.pl | ||
| uplink-x86.pl | ||
| uplink.c | ||
| uplink.h | ||