linux/fs/fuse
Mimi Zohar 0834136aea fuse: define the filesystem as untrusted
Files on FUSE can change at any point in time without IMA being able
to detect it.  The file data read for the file signature verification
could be totally different from what is subsequently read, making the
signature verification useless.

FUSE can be mounted by unprivileged users either today with fusermount
installed with setuid, or soon with the upcoming patches to allow FUSE
mounts in a non-init user namespace.

This patch sets the SB_I_IMA_UNVERIFIABLE_SIGNATURE flag and when
appropriate sets the SB_I_UNTRUSTED_MOUNTER flag.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Dongsu Park <dongsu@kinvolk.io>
Cc: Alban Crequy <alban@kinvolk.io>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
2018-03-23 06:31:37 -04:00
..
Kconfig fuse: Add posix ACL support 2016-10-01 07:32:32 +02:00
Makefile fuse: Use generic xattr ops 2016-10-01 07:32:32 +02:00
acl.c fuse: Add posix ACL support 2016-10-01 07:32:32 +02:00
control.c fs: constify tree_descr arrays passed to simple_fill_super() 2017-04-26 23:54:06 -04:00
cuse.c fuse: honor iocb sync flags on write 2017-09-12 16:57:53 +02:00
dev.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
dir.c fuse: fix READDIRPLUS skipping an entry 2017-10-25 16:34:27 +02:00
file.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
fuse_i.h fs: annotate ->poll() instances 2017-11-27 16:20:05 -05:00
inode.c fuse: define the filesystem as untrusted 2018-03-23 06:31:37 -04:00
xattr.c fuse: limit xattr returned size 2016-10-03 11:06:05 +02:00