From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
linux-crypto@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
Mimi Zohar <zohar@linux.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
David Howells <dhowells@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Jessica Yu <jeyu@kernel.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Jonathan Corbet <corbet@lwn.net>,
"AKASHI, Takahiro" <takahiro.akashi@linaro.org>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>
Subject: [PATCH v8 08/14] ima: Introduce is_signed()
Date: Fri, 16 Nov 2018 18:07:06 -0200 [thread overview]
Message-ID: <20181116200712.14154-9-bauerman@linux.ibm.com> (raw)
In-Reply-To: <20181116200712.14154-1-bauerman@linux.ibm.com>
With the introduction of another IMA signature type (modsig), some places
will need to check for both of them. It is cleaner to do that if there's a
helper function to tell whether an xattr_value represents an IMA
signature.
Suggested-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
security/integrity/ima/ima.h | 5 +++++
security/integrity/ima/ima_appraise.c | 7 +++----
security/integrity/ima/ima_template_lib.c | 2 +-
3 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index cc12f3449a72..e4f72b30cb28 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -154,6 +154,11 @@ unsigned long ima_get_binary_runtime_size(void);
int ima_init_template(void);
void ima_init_template_list(void);
+static inline bool is_signed(const struct evm_ima_xattr_data *xattr_value)
+{
+ return xattr_value && xattr_value->type == EVM_IMA_XATTR_DIGSIG;
+}
+
/*
* used to protect h_table and sha_table
*/
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 8bcef90939f8..c6459408e6b2 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -325,15 +325,14 @@ int ima_appraise_measurement(enum ima_hooks func,
} else if (status != INTEGRITY_PASS) {
/* Fix mode, but don't replace file signatures. */
if ((ima_appraise & IMA_APPRAISE_FIX) &&
- (!xattr_value ||
- xattr_value->type != EVM_IMA_XATTR_DIGSIG)) {
+ !is_signed(xattr_value)) {
if (!ima_fix_xattr(dentry, iint))
status = INTEGRITY_PASS;
}
/* Permit new files with file signatures, but without data. */
if (inode->i_size == 0 && iint->flags & IMA_NEW_FILE &&
- xattr_value && xattr_value->type == EVM_IMA_XATTR_DIGSIG) {
+ is_signed(xattr_value)) {
status = INTEGRITY_PASS;
}
@@ -448,7 +447,7 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST))
return -EINVAL;
ima_reset_appraise_flags(d_backing_inode(dentry),
- xvalue->type == EVM_IMA_XATTR_DIGSIG);
+ is_signed(xvalue));
result = 0;
}
return result;
diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c
index 43752002c222..300912914b17 100644
--- a/security/integrity/ima/ima_template_lib.c
+++ b/security/integrity/ima/ima_template_lib.c
@@ -382,7 +382,7 @@ int ima_eventsig_init(struct ima_event_data *event_data,
{
struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;
- if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG))
+ if (!is_signed(xattr_value))
return 0;
return ima_write_template_field_data(xattr_value, event_data->xattr_len,
next prev parent reply other threads:[~2018-11-16 20:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 20:06 [PATCH v8 00/14] Appended signatures support for IMA appraisal Thiago Jung Bauermann
2018-11-16 20:06 ` [PATCH v8 01/14] MODSIGN: Export module signature definitions Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 02/14] PKCS#7: Refactor verify_pkcs7_signature() and add pkcs7_get_message_sig() Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 03/14] PKCS#7: Introduce pkcs7_get_digest() Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 04/14] integrity: Introduce struct evm_xattr Thiago Jung Bauermann
2018-11-29 20:59 ` Mimi Zohar
2018-11-16 20:07 ` [PATCH v8 05/14] integrity: Introduce integrity_keyring_from_id() Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 06/14] integrity: Introduce asymmetric_sig_has_known_key() Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 07/14] integrity: Select CONFIG_KEYS instead of depending on it Thiago Jung Bauermann
2018-11-16 20:07 ` Thiago Jung Bauermann [this message]
2018-11-16 20:07 ` [PATCH v8 09/14] ima: Export func_tokens Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 10/14] ima: Add modsig appraise_type option for module-style appended signatures Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 11/14] ima: Implement support " Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 12/14] ima: Add new "d-sig" template field Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 13/14] ima: Write modsig to the measurement list Thiago Jung Bauermann
2018-11-16 20:07 ` [PATCH v8 14/14] ima: Store the measurement again when appraising a modsig Thiago Jung Bauermann
2018-12-04 21:59 ` [PATCH v8 00/14] Appended signatures support for IMA appraisal James Morris
2018-12-04 23:35 ` Thiago Jung Bauermann
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