linux-kernel - Re: [Security] [PATCH] xtensa: prevent arbitrary read in ptrace

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Date:	Fri, 8 Jul 2011 11:42:38 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	drosenberg@...curity.com
Cc:	chris@...kel.net, security@...nel.org,
	linux-kernel@...r.kernel.org, "Oleg Nesterov" <oleg@...hat.com>
Subject: Re: [Security] [PATCH] xtensa: prevent arbitrary read in ptrace

On Fri, 8 Jul 2011 18:35:56 +0000
"Dan Rosenberg" <drosenberg@...curity.com> wrote:

> Sorry for the top post and any email mangling (mobile).
> 
> I only used EIO to mirror the existing behavior in ptrace_getxregs(). EFAULT seems better.

ptrace_getxregs() is busted ;)


int ptrace_getxregs(struct task_struct *child, void __user *uregs)
{
...
	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
		return -EIO;
...
	ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
			      sizeof(xtregs->user));

	return ret ? -EFAULT : 0;
}

that makes no sense.

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