Re: [PATCH] x86/alternatives: check int3 breakpoint physical addresses

[Thomas Gleixner]

On Fri, 25 Jan 2019, Alexandre Chartre wrote:
> Note that this issue has been observed and reproduced with a custom kernel
> with some code mapped to different virtual addresses and using jump labels
> As jump labels use text_poke_bp(), crashes were sometimes observed when
> updating jump labels.

Rightfully so. text_poke_bp() pokes at the kernels text mapping which is
very well defined and unique. Why would you map the same text to different
virtual addresses and then use a randomly chosen one to poke at it?

Thanks,

	tglx