From: Seth Forshee <seth.forshee@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx Cc: linux-security-module@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: James Morris <james.l.morris@xxxxxxxxxx> Cc: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx> Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx> Signed-off-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx> Signed-off-by: Dongsu Park <dongsu@xxxxxxxxxx> --- security/integrity/evm/evm_crypto.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c index bcd64baf..729f4545 100644 --- a/security/integrity/evm/evm_crypto.c +++ b/security/integrity/evm/evm_crypto.c @@ -190,7 +190,8 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry, int error; int size; - 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); -- 2.13.6
