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

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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>
This commit is contained in:
Olga Kornievskaia 2021-02-19 17:22:33 -05:00 committed by Paul Moore
parent 8c6d76a314
commit ec1ade6a04
4 changed files with 9 additions and 0 deletions
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3
fs/nfs/fs_context.c
View File

@ -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)

1
fs/nfs/internal.h
View File

@ -96,6 +96,7 @@ struct nfs_fs_context {
char *fscache_uniq;
unsigned short protofamily;
unsigned short mountfamily;
bool has_sec_mnt_opts;
struct {
union {

4
fs/nfs/super.c
View File

@ -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);
}

1
include/linux/nfs_fs_sb.h
View File

@ -256,6 +256,7 @@ struct nfs_server {
/* User namespace info */
const struct cred *cred;
bool has_sec_mnt_opts;
};
/* Server capabilities */