linux-kernel - Re: QUestion on x86_64 and i386 for settings of SS segment register

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Message-ID: <CA+ekxPWrZa94b4ifPtrum1oawyT8Ua1e7=y4ao-T_Lysspfnjw@mail.gmail.com>
Date:	Sat, 24 Oct 2015 15:37:47 -0600
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: QUestion on x86_64 and i386 for settings of SS segment register

Found the answer in ptrace.h -- the answer is no.  never mind.

Jeff

On 10/24/15, Jeffrey Merkey <jeffmerkey@...il.com> wrote:
> I am updating the mdb kernel debugger on 4.2.4 and I noticed that
> user_mode_vm has been removed from the kernel sources for detecting
> user space memory addresses for purposes of loading the SS pointer.  I
> am using __KERNEL_DS presently.
>
> old code:
>
> if (user_mode_vm(regs))
> {
>     sf->tSS = regs->ss;
>     sf->tSP = regs->sp;
> } else {
>       sf->tSS = __KERNEL_DS;
>       sf->tSP = kernel_stack_pointer(regs);
> }
>
> is SS always assumed to be __KERNEL_DS in 4.2.4 for userspace stack
> addresses passed by pt_regs?
>
>
> Thanks
>
> Jeff
>
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