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Date: Sat, 26 May 2018 18:48:19 +0300
From: Alexey Dobriyan <>
To: Salvatore Mesoraca <>
Cc:,,,, Andrew Morton <>,
	Akinobu Mita <>,
	Dmitry Vyukov <>, Arnd Bergmann <>,
	Davidlohr Bueso <>,
	Kees Cook <>
Subject: Re: [PATCH] proc: prevent a task from writing on its own /proc/*/mem

On Sat, May 26, 2018 at 04:50:46PM +0200, Salvatore Mesoraca wrote:
> Prevent a task from opening, in "write" mode, any /proc/*/mem
> file that operates on the task's mm.
> /proc/*/mem is mainly a debugging means and, as such, it shouldn't
> be used by the inspected process itself.
> Current implementation always allow a task to access its own
> /proc/*/mem file.
> A process can use it to overwrite read-only memory, making
> pointless the use of security_file_mprotect() or other ways to
> enforce RO memory.

You can do it in security_ptrace_access_check() or security_file_open()

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