Messages in this thread | | | Date | Thu, 14 Feb 2013 20:18:42 +0100 | From | Oleg Nesterov <> | Subject | Re: [PATCH] x86: make PTRACE_GETREGSET return 32-bit regs if 64-bit process entered kernel with int 80 |
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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, >>> https://lkml.org/lkml/2012/1/18/320 >>> > > 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.
Oleg.
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