Re: ioperm is preserved across fork and execve, but iopl is not

[One Thousand Gnomes]

> As recently as October 2012, 32-bit Linux kernels preserved both iopl
> and ioperm across fork and execve, but the behavior of iopl changed
> with this commit:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/x86/kernel/process_32.c?id=6783eaa2e1253fbcbe2c2f6bb4c843abf1343caf

Missed this thread initially. That perhaps does argue for it being safer
to put back.

> And the man page for iopl continues to state "permissions are
> inherited by fork and execve": http://linux.die.net/man/2/iopl
> 
> A test program demonstrating the problem is attached

Is there a real world use case ?

Alan
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