diff options
| author | Seth Forshee <[email protected]> | 2017-12-22 15:32:35 +0100 |
|---|---|---|
| committer | Eric W. Biederman <[email protected]> | 2018-05-03 11:28:29 -0500 |
| commit | a3a5c966a664dfde0393dd366c2cb916962d164f (patch) | |
| tree | b3a0bfcebdc687080bb7135ef040bf55b3044a7c | |
| parent | 6da6c0db5316275015e8cc2959f12a17584aeb64 (diff) | |
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: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: James Morris <[email protected]>
Cc: Mimi Zohar <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Signed-off-by: Seth Forshee <[email protected]>
Signed-off-by: Dongsu Park <[email protected]>
Signed-off-by: Eric W. Biederman <[email protected]>
| -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); |