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-rw-r--r--security/integrity/evm/evm.h7
-rw-r--r--security/integrity/evm/evm_main.c38
-rw-r--r--security/integrity/evm/evm_secfs.c20
3 files changed, 53 insertions, 12 deletions
diff --git a/security/integrity/evm/evm.h b/security/integrity/evm/evm.h
index 241aca315b0c..3d05250e8313 100644
--- a/security/integrity/evm/evm.h
+++ b/security/integrity/evm/evm.h
@@ -23,9 +23,12 @@
#define EVM_INIT_HMAC 0x0001
#define EVM_INIT_X509 0x0002
-#define EVM_SETUP 0x80000000 /* userland has signaled key load */
+#define EVM_ALLOW_METADATA_WRITES 0x0004
+#define EVM_SETUP_COMPLETE 0x80000000 /* userland has signaled key load */
-#define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP)
+#define EVM_KEY_MASK (EVM_INIT_HMAC | EVM_INIT_X509)
+#define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP_COMPLETE | \
+ EVM_ALLOW_METADATA_WRITES)
extern int evm_initialized;
extern char *evm_hmac;
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 9826c02e2db8..ba89c2468298 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -76,6 +76,11 @@ static void __init evm_init_config(void)
pr_info("HMAC attrs: 0x%x\n", evm_hmac_attrs);
}
+static bool evm_key_loaded(void)
+{
+ return (bool)(evm_initialized & EVM_KEY_MASK);
+}
+
static int evm_find_protected_xattrs(struct dentry *dentry)
{
struct inode *inode = d_backing_inode(dentry);
@@ -241,7 +246,7 @@ enum integrity_status evm_verifyxattr(struct dentry *dentry,
void *xattr_value, size_t xattr_value_len,
struct integrity_iint_cache *iint)
{
- if (!evm_initialized || !evm_protected_xattr(xattr_name))
+ if (!evm_key_loaded() || !evm_protected_xattr(xattr_name))
return INTEGRITY_UNKNOWN;
if (!iint) {
@@ -265,7 +270,7 @@ static enum integrity_status evm_verify_current_integrity(struct dentry *dentry)
{
struct inode *inode = d_backing_inode(dentry);
- if (!evm_initialized || !S_ISREG(inode->i_mode) || evm_fixmode)
+ if (!evm_key_loaded() || !S_ISREG(inode->i_mode) || evm_fixmode)
return 0;
return evm_verify_hmac(dentry, NULL, NULL, 0, NULL);
}
@@ -299,6 +304,7 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
return 0;
goto out;
}
+
evm_status = evm_verify_current_integrity(dentry);
if (evm_status == INTEGRITY_NOXATTRS) {
struct integrity_iint_cache *iint;
@@ -345,6 +351,12 @@ int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name,
{
const struct evm_ima_xattr_data *xattr_data = xattr_value;
+ /* Policy permits modification of the protected xattrs even though
+ * there's no HMAC key loaded
+ */
+ if (evm_initialized & EVM_ALLOW_METADATA_WRITES)
+ return 0;
+
if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
if (!xattr_value_len)
return -EINVAL;
@@ -365,6 +377,12 @@ int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name,
*/
int evm_inode_removexattr(struct dentry *dentry, const char *xattr_name)
{
+ /* Policy permits modification of the protected xattrs even though
+ * there's no HMAC key loaded
+ */
+ if (evm_initialized & EVM_ALLOW_METADATA_WRITES)
+ return 0;
+
return evm_protect_xattr(dentry, xattr_name, NULL, 0);
}
@@ -393,8 +411,8 @@ static void evm_reset_status(struct inode *inode)
void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name,
const void *xattr_value, size_t xattr_value_len)
{
- if (!evm_initialized || (!evm_protected_xattr(xattr_name)
- && !posix_xattr_acl(xattr_name)))
+ if (!evm_key_loaded() || (!evm_protected_xattr(xattr_name)
+ && !posix_xattr_acl(xattr_name)))
return;
evm_reset_status(dentry->d_inode);
@@ -414,7 +432,7 @@ void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name,
*/
void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name)
{
- if (!evm_initialized || !evm_protected_xattr(xattr_name))
+ if (!evm_key_loaded() || !evm_protected_xattr(xattr_name))
return;
evm_reset_status(dentry->d_inode);
@@ -431,6 +449,12 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
unsigned int ia_valid = attr->ia_valid;
enum integrity_status evm_status;
+ /* Policy permits modification of the protected attrs even though
+ * there's no HMAC key loaded
+ */
+ if (evm_initialized & EVM_ALLOW_METADATA_WRITES)
+ return 0;
+
if (!(ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID)))
return 0;
evm_status = evm_verify_current_integrity(dentry);
@@ -456,7 +480,7 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
*/
void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
{
- if (!evm_initialized)
+ if (!evm_key_loaded())
return;
if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))
@@ -473,7 +497,7 @@ int evm_inode_init_security(struct inode *inode,
struct evm_ima_xattr_data *xattr_data;
int rc;
- if (!evm_initialized || !evm_protected_xattr(lsm_xattr->name))
+ if (!evm_key_loaded() || !evm_protected_xattr(lsm_xattr->name))
return 0;
xattr_data = kzalloc(sizeof(*xattr_data), GFP_NOFS);
diff --git a/security/integrity/evm/evm_secfs.c b/security/integrity/evm/evm_secfs.c
index 319cf16d6603..feba03bbedae 100644
--- a/security/integrity/evm/evm_secfs.c
+++ b/security/integrity/evm/evm_secfs.c
@@ -40,7 +40,7 @@ static ssize_t evm_read_key(struct file *filp, char __user *buf,
if (*ppos != 0)
return 0;
- sprintf(temp, "%d", (evm_initialized & ~EVM_SETUP));
+ sprintf(temp, "%d", (evm_initialized & ~EVM_SETUP_COMPLETE));
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
return rc;
@@ -63,7 +63,7 @@ static ssize_t evm_write_key(struct file *file, const char __user *buf,
{
int i, ret;
- if (!capable(CAP_SYS_ADMIN) || (evm_initialized & EVM_SETUP))
+ if (!capable(CAP_SYS_ADMIN) || (evm_initialized & EVM_SETUP_COMPLETE))
return -EPERM;
ret = kstrtoint_from_user(buf, count, 0, &i);
@@ -75,16 +75,30 @@ static ssize_t evm_write_key(struct file *file, const char __user *buf,
if (!i || (i & ~EVM_INIT_MASK) != 0)
return -EINVAL;
+ /* Don't allow a request to freshly enable metadata writes if
+ * keys are loaded.
+ */
+ if ((i & EVM_ALLOW_METADATA_WRITES) &&
+ ((evm_initialized & EVM_KEY_MASK) != 0) &&
+ !(evm_initialized & EVM_ALLOW_METADATA_WRITES))
+ return -EPERM;
+
if (i & EVM_INIT_HMAC) {
ret = evm_init_key();
if (ret != 0)
return ret;
/* Forbid further writes after the symmetric key is loaded */
- i |= EVM_SETUP;
+ i |= EVM_SETUP_COMPLETE;
}
evm_initialized |= i;
+ /* Don't allow protected metadata modification if a symmetric key
+ * is loaded
+ */
+ if (evm_initialized & EVM_INIT_HMAC)
+ evm_initialized &= ~(EVM_ALLOW_METADATA_WRITES);
+
return count;
}
generated by cgit (git 2.34.1) at 2024-05-29 16:49:35 +0000