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_UNTRUSTED_FS flag. Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx> Cc: Miklos Szeredi <miklos@xxxxxxxxxx> Cc: Seth Forshee <seth.forshee@xxxxxxxxxxxxx> Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx> Cc: Dongsu Park <dongsu@xxxxxxxxxx> Cc: Alban Crequy <alban@xxxxxxxxxx> Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx> --- fs/fuse/inode.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 624f18bbfd2b..2cbf01fc85a2 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -1080,6 +1080,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent) sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_time_gran = 1; sb->s_export_op = &fuse_export_operations; + sb->s_iflags |= SB_I_IMA_UNTRUSTED_FS; file = fget(d.fd); err = -EINVAL; -- 2.7.5
