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Date: Tue, 6 Sep 2016 18:19:21 +0200
From: Jann Horn <>
To: Andy Lutomirski <>
Cc: Linus Torvalds <>,
	Oleg Nesterov <>, Andy Lutomirski <>,
	the arch/x86 maintainers <>,
	Linux Kernel Mailing List <>,
	"" <>,
	Borislav Petkov <>, Nadav Amit <>,
	Kees Cook <>, Brian Gerst <>,
	"" <>,
	Josh Poimboeuf <>,
	Heiko Carstens <>
Subject: Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86,

On Thu, Jun 23, 2016 at 09:41:11AM -0700, Andy Lutomirski wrote:
> 3. Free stacks immediately and cache them (really easy).

Random note: task_current_syscall() (via /proc/$pid/syscall) will probably need additional
locking when the stack is freed before the task.

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