Re: [PATCH] x86: make PTRACE_GETREGSET return 32-bit regs if64-bit process entered kernel with int 80
From: Oleg Nesterov
Date: Thu Feb 14 2013 - 14:20:00 EST
On 02/14, H. Peter Anvin wrote:
> On 02/14/2013 07:00 AM, Oleg Nesterov wrote:
>> On 02/14, Denys Vlasenko wrote:
>>> Determining personality of a ptraced process is a murky area.
>>> On x86, for years strace was looking at segment selectors,
>>> which is conceptually wrong: see, for example,
> One proposal that keeps being on the table is to export a regset with
> metadatam, including process mode at launch (i386, x86-64, x32).
Yes... but if this metadata includes TS_COMPAT-is-set, then strace should
do PTRACE_GETREGSET(REGSET_META) + PTRACE_GETREGSET(REGSET_GENERAL) every
time. Or REGSET_META should include META+GENERAL.
IOW, it is not clear to me what this "meta" should actually report.
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