# Re: \[PATCH v3 2/5\] fs: Add a MAY\_EXECMOUNT flag to infer the noexec mount property

- From: James Morris \<jmorris@namei.org\>
- Date: 2020-05-01 04:03:18 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2020/05/178620
- Thread: https://ratatoskr.run/linux-api/2020/04/178350/t.md

```text
On Tue, 28 Apr 2020, Mickaël Salaün wrote:

> An LSM doesn't get path information related to an access request to open
> an inode.  This new (internal) MAY_EXECMOUNT flag enables an LSM to
> check if the underlying mount point of an inode is marked as executable.
> This is useful to implement a security policy taking advantage of the
> noexec mount option.
> 
> This flag is set according to path_noexec(), which checks if a mount
> point is mounted with MNT_NOEXEC or if the underlying superblock is
> SB_I_NOEXEC.
> 
> Signed-off-by: Mickaël Salaün <mic@digikod.net>
> Reviewed-by: Philippe Trébuchet <redacted>
> Reviewed-by: Thibaut Sautereau <redacted>
> Cc: Aleksa Sarai <redacted>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: Kees Cook <redacted>

Are there any existing LSMs which plan to use this aspect?

-- 
James Morris
[ref]
```