linux-kernel - uprobes && shmem (Was: uprobes: Shift ->readpage check from __copy_insn() to uprobe

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Date:	Fri, 16 May 2014 17:30:58 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>, Ingo Molnar <mingo@...e.hu>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: uprobes && shmem (Was: uprobes: Shift ->readpage check from
	__copy_insn() to uprobe_register())

Hi Hugh,

On 05/16, Oleg Nesterov wrote:
>
> copy_insn() fails with -EIO if ->readpage == NULL

In particular, this means that we can not probe the binaries on tmpfs.
This is pity.

It seems that the potential fix is trivial, copy_insn() could use
shmem_getpage_gfp(). But, is there any way to figure out that this
inode/mapping/aops/whatever is actually shmem?

I am looking at shmem_get_inode() and I see nothing which could help,
and shmem_aops/etc are all static.

Oleg.

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