diff options
| author | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2018-02-21 17:36:32 +0100 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2018-03-23 11:31:37 +0100 |
| commit | 9e67028e76514a8ee279d7d006dfb8069b5115ab (patch) | |
| tree | 9827bd28b629bf69db447666494194d118d58e25 /security/integrity/ima/ima_main.c | |
| parent | ima: clear IMA_HASH (diff) | |
| download | linux-9e67028e76514a8ee279d7d006dfb8069b5115ab.tar.xz linux-9e67028e76514a8ee279d7d006dfb8069b5115ab.zip | |
ima: fail signature verification based on policy
This patch addresses the fuse privileged mounted filesystems in
environments which are unwilling to accept the risk of trusting the
signature verification and want to always fail safe, but are for example
using a pre-built kernel.
This patch defines a new builtin policy named "fail_securely", which can
be specified on the boot command line as an argument to "ima_policy=".
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Dongsu Park <dongsu@kinvolk.io>
Cc: Alban Crequy <alban@kinvolk.io>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'security/integrity/ima/ima_main.c')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index f550f25294a3..5d122daf5c8a 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -238,7 +238,8 @@ static int process_measurement(struct file *file, const struct cred *cred, */ if (test_and_clear_bit(IMA_CHANGE_XATTR, &iint->atomic_flags) || ((inode->i_sb->s_iflags & SB_I_IMA_UNVERIFIABLE_SIGNATURE) && - !(inode->i_sb->s_iflags & SB_I_UNTRUSTED_MOUNTER))) { + !(inode->i_sb->s_iflags & SB_I_UNTRUSTED_MOUNTER) && + !(action & IMA_FAIL_UNVERIFIABLE_SIGS))) { iint->flags &= ~IMA_DONE_MASK; iint->measured_pcrs = 0; } |