QUestion on x86_64 and i386 for settings of SS segment register

From	Jeffrey Merkey <jeffmerkey@gmail.com>
Newsgroups	linux.kernel
Subject	QUestion on x86_64 and i386 for settings of SS segment register
Date	2015-10-24 23:30 +0200
Message-ID	<qnexY-3WR-9@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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QUestion on x86_64 and i386 for settings of SS segment register Jeffrey Merkey <jeffmerkey@gmail.com> - 2015-10-24 23:30 +0200
  Re: QUestion on x86_64 and i386 for settings of SS segment register Jeffrey Merkey <jeffmerkey@gmail.com> - 2015-10-24 23:40 +0200

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