Messages in this thread | | | Date | Fri, 1 May 2020 14:02:16 +1000 (AEST) | From | James Morris <> | Subject | Re: [PATCH v3 2/5] fs: Add a MAY_EXECMOUNT flag to infer the noexec mount property |
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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 <philippe.trebuchet@ssi.gouv.fr> > Reviewed-by: Thibaut Sautereau <thibaut.sautereau@ssi.gouv.fr> > Cc: Aleksa Sarai <cyphar@cyphar.com> > Cc: Al Viro <viro@zeniv.linux.org.uk> > Cc: Kees Cook <keescook@chromium.org>
Are there any existing LSMs which plan to use this aspect?
-- James Morris <jmorris@namei.org> | |