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From: Matthew Garrett <mjg59@google.com>
To: Igor Zhbanov <i.zhbanov@omprussia.ru>
Cc: Stephen Smalley <sds@tycho.nsa.gov>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Kees Cook <keescook@chromium.org>,
	Casey Schaufler <casey@schaufler-ca.com>,
	Paul Moore <paul@paul-moore.com>,
	John Johansen <john.johansen@canonical.com>,
	linux-integrity <linux-integrity@vger.kernel.org>,
	Jann Horn <jannh@google.com>,
	linux-security-module <linux-security-module@vger.kernel.org>
Subject: Re: Should mprotect(..., PROT_EXEC) be checked by IMA?
Date: Wed, 3 Apr 2019 12:25:58 -0700	[thread overview]
Message-ID: <CACdnJutN3415jtt+kaz-zxyAw0V9-0x0_YGWpxBXWYseD5Z7uA@mail.gmail.com> (raw)
In-Reply-To: <3ebff410-f1bd-654e-7cd0-486ea4768ebe@omprussia.ru>

On Wed, Apr 3, 2019 at 11:47 AM Igor Zhbanov <i.zhbanov@omprussia.ru> wrote:
> On 03.04.2019 21:19, Matthew Garrett wrote:
> > There's two possible cases here:
> >
> > 1) The application is legitimate but can be convinced to open and
> > execute malicious code. There should be no such applications that
> > download code from the internet and execute it directly, so this can
> > be prevented by requiring that files be signed (which has to be done
> > to protect against attackers just using an interpreted language
> > instead)
> > 2) The application is actively malicious. In this case this approach
> > is insufficient - an actively malicious application can interpret code
> > rather than executing it directly. This can only be prevented by not
> > signing malicious applications.
> >
> > When you talk about "staying below the radar" it implies that you're
> > talking about case 2, but the proposed solution is only a speed bump
> > rather than a blocker.
>
> But what about buffer/stack overflow? The application doesn't need to be
> malicious. It could be just a web-browser or e-mail client processing
> some evil file.

Executable pages shouldn't be writable?

  reply	other threads:[~2019-04-03 19:26 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-18 15:18 Should mprotect(..., PROT_EXEC) be checked by IMA? Igor Zhbanov
2019-03-18 21:48 ` Mimi Zohar
2019-03-19  7:50   ` Igor Zhbanov
2019-03-19 11:22     ` Mimi Zohar
2019-03-19 12:19       ` Igor Zhbanov
2019-03-19 17:05         ` Mimi Zohar
2019-03-20  8:11           ` Igor Zhbanov
2019-03-20 17:23             ` Matthew Garrett
2019-03-20 18:08               ` Igor Zhbanov
2019-03-21 11:21               ` Mimi Zohar
2019-03-21 11:48                 ` Igor Zhbanov
2019-03-21 18:04                   ` Matthew Garrett
2019-03-22  7:59                     ` Igor Zhbanov
2019-03-28 17:17                       ` Mimi Zohar
2019-03-29 10:00                         ` Igor Zhbanov
2019-03-29 10:59                           ` Mimi Zohar
2019-03-29 11:51                             ` Jordan Glover
2019-03-29 12:28                             ` Stephen Smalley
2019-03-29 12:50                               ` Igor Zhbanov
2019-04-02 22:31                                 ` Matthew Garrett
2019-04-03  9:59                                   ` Igor Zhbanov
2019-04-03 16:58                                     ` Matthew Garrett
2019-04-03 17:31                                       ` Igor Zhbanov
2019-04-03 18:19                                         ` Matthew Garrett
2019-04-03 18:47                                           ` Igor Zhbanov
2019-04-03 19:25                                             ` Matthew Garrett [this message]
2019-04-04 11:44                                               ` Igor Zhbanov
2019-04-03 12:11                                   ` Mimi Zohar
2019-04-03 13:18                                     ` Perez Yves-Alexis
2019-04-03 11:57                                 ` Mimi Zohar
2019-04-03 13:10                                   ` Stephen Smalley
2019-04-03 14:33                                     ` Mimi Zohar
2019-04-03 14:33                                       ` Stephen Smalley
2019-04-03 16:21                                         ` Mimi Zohar
2019-03-21 18:13                 ` Matthew Garrett
2019-03-19 17:07         ` Matthew Garrett

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