Re: [PATCH 1/2] uprobes: add comment with insn opcodes, mnemonics and why we dont support them

[Oleg Nesterov]

On 05/05, Denys Vlasenko wrote:
>
> + * Opcodes we'll probably never support:
> + * 6c-6f - ins,outs. SEGVs if used in userspace
> + * e4-e7 - in,out imm. SEGVs if used in userspace
> + * ec-ef - in,out acc. SEGVs if used in userspace

Well. I have no idea why they are nacked, but this is not the reason.

SEGVs are fine. Plus we have ioperm().

> + * cc - int3. SIGTRAP if used in userspace

SIGTRAP is not the reason. We do not want to enter do_int3() in UTASK_SSTEP
state with utask->active_uprobe != NULL etc. Too many potential complications.

Oleg.

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