[LTP] [PATCH] cve: add test reproducer for cve-2025-21756

[Cyril Hrubis]

Hi!
> I guess we need to verify that, if system is not crashed, we should 
> check kernel messages in order to find any error. Is there a smart way 
> to do it? I could parse data via FILE_LINES_SCANF() macro, but that 
> would require multiple iterations. The alternative is just to parse the 
> entire /dev/kmsg via read() and to find:
> 
> 1. use-after-free message
> 2. test name after it
> 3. failing syscall vsock_release
> 
> WDYT? Maybe there are better ways to do it.

We have library functions to watch for kernel taint flags, that should
be enough to detect this.

-- 
Cyril Hrubis
chrubis@suse.cz