diff options
| author |   Seth Forshee <seth.forshee@canonical.com> | 2017-12-22 15:32:35 +0100 |
|---|---|---|
| committer |   Eric W. Biederman <ebiederm@xmission.com> | 2018-05-03 11:28:29 -0500 |
| commit | a3a5c966a664dfde0393dd366c2cb916962d164f (patch) | |
| tree | b3a0bfcebdc687080bb7135ef040bf55b3044a7c /security/integrity/evm/evm_crypto.c | |
| parent | Linux v4.17-rc3 (diff) | |
| download | linux-dev-a3a5c966a664dfde0393dd366c2cb916962d164f.tar.xz linux-dev-a3a5c966a664dfde0393dd366c2cb916962d164f.zip | |
evm: Don't update hmacs in user ns mounts
The kernel should not calculate new hmacs for mounts done by
non-root users. Update evm_calc_hmac_or_hash() to refuse to
calculate new hmacs for mounts for non-init user namespaces.
Cc: linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: James Morris <james.l.morris@oracle.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Dongsu Park <dongsu@kinvolk.io>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'security/integrity/evm/evm_crypto.c')
| -rw-r--r-- | security/integrity/evm/evm_crypto.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c index a46fba322340..facf9cdd577d 100644 --- a/security/integrity/evm/evm_crypto.c +++ b/security/integrity/evm/evm_crypto.c @@ -200,7 +200,8 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry, int size; bool ima_present = false; - if (!(inode->i_opflags & IOP_XATTR)) + if (!(inode->i_opflags & IOP_XATTR) || + inode->i_sb->s_user_ns != &init_user_ns) return -EOPNOTSUPP; desc = init_desc(type); |