RFR: JDK-8297242: Use-after-free during library unloading on Linux

[David Holmes]

On Fri, 18 Nov 2022 05:29:37 GMT, Justin King <jcking at openjdk.org> wrote:

> ASan identified a use-after-free in `os::dll_unload` caused by referencing memory owned by the dynamic loader after closing the library.

src/hotspot/os/posix/os_posix.cpp line 724:

> 722:   const char* l_path = NULL;
> 723:   char* l_pathdup = NULL;
> 724:   LINUX_ONLY(

The XXX_ONLY macros are intended for one-liners or in-line conditionals. For a block please use `#ifdef LINUX`.

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PR: https://git.openjdk.org/jdk/pull/11231