Re: System Call trashing registers

[Pavel Machek]

Hi!

> 1) A lot of my old 32-bit programs don't work on x64 linux anymore
> because int 80h now trashes ecx and edx. This hasn't been a serious
> problem for me.
> 
> 2) syscall is documented to trash rcx and r11.
> 
> What I don't understand is why this hasn't ever led to a security
> issue due to leaking values from kernel space (in the trashed
> registers) back to userspace.

I guess you should cc x86 maintainers?

I guess this is a regression? When did it start?

BR,
								Pavel
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