From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 13 Dec 2018 06:51:53 +1100 (AEDT) From: James Morris Subject: Re: [RFC PATCH v1 0/5] Add support for O_MAYEXEC In-Reply-To: <20181212081712.32347-1-mic@digikod.net> Message-ID: References: <20181212081712.32347-1-mic@digikod.net> MIME-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="1665246916-1625860249-1544644091=:29507" Content-ID: To: =?ISO-8859-15?Q?Micka=EBl_Sala=FCn?= Cc: linux-kernel@vger.kernel.org, Al Viro , Jonathan Corbet , Kees Cook , Matthew Garrett , Michael Kerrisk , =?ISO-8859-15?Q?Micka=EBl_Sala=FCn?= , Mimi Zohar , =?ISO-8859-15?Q?Philippe_Tr=E9buchet?= , Shuah Khan , Thibaut Sautereau , Vincent Strubel , Yves-Alexis Perez , kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org List-ID: This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --1665246916-1625860249-1544644091=:29507 Content-Type: text/plain; CHARSET=ISO-8859-15 Content-Transfer-Encoding: 8BIT Content-ID: On Wed, 12 Dec 2018, Mickaël Salaün wrote: > Hi, > > The goal of this patch series is to control script interpretation. A > new O_MAYEXEC flag used by sys_open() is added to enable userland script > interpreter to delegate to the kernel (and thus the system security > policy) the permission to interpret scripts or other files containing > what can be seen as commands. > > The security policy is the responsibility of an LSM. A basic > system-wide policy is implemented with Yama and configurable through a > sysctl. If you're depending on the script interpreter to flag that the user may execute code, this seems to be equivalent in security terms to depending on the user. e.g. what if the user uses ptrace and clears O_MAYEXEC? -- James Morris --1665246916-1625860249-1544644091=:29507--