nfs: account for selinux security context when deciding to share superblock

Keep track of whether or not there were LSM security context
options passed during mount (ie creation of the superblock).
Then, while deciding if the superblock can be shared for the new
mount, check if the newly passed in LSM security context options
are compatible with the existing superblock's ones by calling
security_sb_mnt_opts_compat().

Previously, with selinux enabled, NFS wasn't able to do the
following 2mounts:
mount -o vers=4.2,sec=sys,context=system_u:object_r:root_t:s0
<serverip>:/ /mnt
mount -o vers=4.2,sec=sys,context=system_u:object_r:swapfile_t:s0
<serverip>:/scratch /scratch

2nd mount would fail with "mount.nfs: an incorrect mount option was
specified" and var log messages would have:
"SElinux: mount invalid. Same superblock, different security
settings for.."

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
[PM: tweak subject line]
Signed-off-by: Paul Moore <paul@paul-moore.com>

diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index 971a925..a06d213 100644 (file)
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -463,6 +463,9 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
        if (opt < 0)
                return ctx->sloppy ? 1 : opt;
 
+       if (fc->security)
+               ctx->has_sec_mnt_opts = 1;
+
        switch (opt) {
        case Opt_source:
                if (fc->source)

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 25fb43b..c3f57b4 100644 (file)
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -96,6 +96,7 @@ struct nfs_fs_context {
        char                    *fscache_uniq;
        unsigned short          protofamily;
        unsigned short          mountfamily;
+       bool                    has_sec_mnt_opts;
 
        struct {
                union {

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index de83c61..4aaa1f5 100644 (file)
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1077,6 +1077,7 @@ static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
                                                 &sb->s_blocksize_bits);
 
        nfs_super_set_maxbytes(sb, server->maxfilesize);
+       server->has_sec_mnt_opts = ctx->has_sec_mnt_opts;
 }
 
 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
@@ -1193,6 +1194,9 @@ static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
                return 0;
        if (!nfs_compare_userns(old, server))
                return 0;
+       if ((old->has_sec_mnt_opts || fc->security) &&
+                       security_sb_mnt_opts_compat(sb, fc->security))
+               return 0;
        return nfs_compare_mount_options(sb, server, fc);
 }
 

diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 6f76b32..a28d71b 100644 (file)
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -256,6 +256,7 @@ struct nfs_server {
 
        /* User namespace info */
        const struct cred       *cred;
+       bool                    has_sec_mnt_opts;
 };
 
 /* Server capabilities */