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-rw-r--r--security/integrity/ima/ima_api.c67
-rw-r--r--security/integrity/ima/ima_appraise.c4
-rw-r--r--security/integrity/ima/ima_crypto.c10
-rw-r--r--security/integrity/ima/ima_fs.c6
-rw-r--r--security/integrity/ima/ima_main.c23
-rw-r--r--security/integrity/ima/ima_policy.c6
6 files changed, 75 insertions, 41 deletions
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index c2edba8de35e..c7e8db0ea4c0 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -199,42 +199,59 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
struct inode *inode = file_inode(file);
const char *filename = file->f_path.dentry->d_name.name;
int result = 0;
+ int length;
+ void *tmpbuf;
+ u64 i_version;
struct {
struct ima_digest_data hdr;
char digest[IMA_MAX_DIGEST_SIZE];
} hash;
- if (!(iint->flags & IMA_COLLECTED)) {
- u64 i_version = file_inode(file)->i_version;
+ if (iint->flags & IMA_COLLECTED)
+ goto out;
- if (file->f_flags & O_DIRECT) {
- audit_cause = "failed(directio)";
- result = -EACCES;
- goto out;
- }
+ /*
+ * Dectecting file change is based on i_version. On filesystems
+ * which do not support i_version, support is limited to an initial
+ * measurement/appraisal/audit.
+ */
+ i_version = file_inode(file)->i_version;
+ hash.hdr.algo = algo;
- hash.hdr.algo = algo;
-
- result = (!buf) ? ima_calc_file_hash(file, &hash.hdr) :
- ima_calc_buffer_hash(buf, size, &hash.hdr);
- if (!result) {
- int length = sizeof(hash.hdr) + hash.hdr.length;
- void *tmpbuf = krealloc(iint->ima_hash, length,
- GFP_NOFS);
- if (tmpbuf) {
- iint->ima_hash = tmpbuf;
- memcpy(iint->ima_hash, &hash, length);
- iint->version = i_version;
- iint->flags |= IMA_COLLECTED;
- } else
- result = -ENOMEM;
- }
+ /* Initialize hash digest to 0's in case of failure */
+ memset(&hash.digest, 0, sizeof(hash.digest));
+
+ if (buf)
+ result = ima_calc_buffer_hash(buf, size, &hash.hdr);
+ else
+ result = ima_calc_file_hash(file, &hash.hdr);
+
+ if (result && result != -EBADF && result != -EINVAL)
+ goto out;
+
+ length = sizeof(hash.hdr) + hash.hdr.length;
+ tmpbuf = krealloc(iint->ima_hash, length, GFP_NOFS);
+ if (!tmpbuf) {
+ result = -ENOMEM;
+ goto out;
}
+
+ iint->ima_hash = tmpbuf;
+ memcpy(iint->ima_hash, &hash, length);
+ iint->version = i_version;
+
+ /* Possibly temporary failure due to type of read (eg. O_DIRECT) */
+ if (!result)
+ iint->flags |= IMA_COLLECTED;
out:
- if (result)
+ if (result) {
+ if (file->f_flags & O_DIRECT)
+ audit_cause = "failed(directio)";
+
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
filename, "collect_data", audit_cause,
result, 0);
+ }
return result;
}
@@ -278,7 +295,7 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
}
result = ima_store_template(entry, violation, inode, filename, pcr);
- if (!result || result == -EEXIST) {
+ if ((!result || result == -EEXIST) && !(file->f_flags & O_DIRECT)) {
iint->flags |= IMA_MEASURED;
iint->measured_pcrs |= (0x1 << pcr);
}
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 809ba70fbbbf..ec7dfa02c051 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -40,7 +40,7 @@ __setup("ima_appraise=", default_appraise_setup);
*/
bool is_ima_appraise_enabled(void)
{
- return (ima_appraise & IMA_APPRAISE_ENFORCE) ? 1 : 0;
+ return ima_appraise & IMA_APPRAISE_ENFORCE;
}
/*
@@ -405,7 +405,7 @@ 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) ? 1 : 0);
+ xvalue->type == EVM_IMA_XATTR_DIGSIG);
result = 0;
}
return result;
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index 802d5d20f36f..a856d8c9c9f3 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -441,6 +441,16 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
loff_t i_size;
int rc;
+ /*
+ * For consistency, fail file's opened with the O_DIRECT flag on
+ * filesystems mounted with/without DAX option.
+ */
+ if (file->f_flags & O_DIRECT) {
+ hash->length = hash_digest_size[ima_hash_algo];
+ hash->algo = ima_hash_algo;
+ return -EINVAL;
+ }
+
i_size = i_size_read(file_inode(file));
if (ima_ahash_minsize && i_size >= ima_ahash_minsize) {
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index ad491c51e833..fa540c0469da 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -32,7 +32,7 @@ bool ima_canonical_fmt;
static int __init default_canonical_fmt_setup(char *str)
{
#ifdef __BIG_ENDIAN
- ima_canonical_fmt = 1;
+ ima_canonical_fmt = true;
#endif
return 1;
}
@@ -429,10 +429,10 @@ static int ima_release_policy(struct inode *inode, struct file *file)
}
ima_update_policy();
-#ifndef CONFIG_IMA_WRITE_POLICY
+#if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)
securityfs_remove(ima_policy);
ima_policy = NULL;
-#else
+#elif defined(CONFIG_IMA_WRITE_POLICY)
clear_bit(IMA_FS_BUSY, &ima_fs_flags);
#endif
return 0;
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 2aebb7984437..770654694efc 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -51,6 +51,8 @@ static int __init hash_setup(char *str)
ima_hash_algo = HASH_ALGO_SHA1;
else if (strncmp(str, "md5", 3) == 0)
ima_hash_algo = HASH_ALGO_MD5;
+ else
+ return 1;
goto out;
}
@@ -60,6 +62,8 @@ static int __init hash_setup(char *str)
break;
}
}
+ if (i == HASH_ALGO__LAST)
+ return 1;
out:
hash_setup_done = 1;
return 1;
@@ -235,11 +239,8 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
hash_algo = ima_get_hash_algo(xattr_value, xattr_len);
rc = ima_collect_measurement(iint, file, buf, size, hash_algo);
- if (rc != 0) {
- if (file->f_flags & O_DIRECT)
- rc = (iint->flags & IMA_PERMIT_DIRECTIO) ? 0 : -EACCES;
+ if (rc != 0 && rc != -EBADF && rc != -EINVAL)
goto out_digsig;
- }
if (!pathbuf) /* ima_rdwr_violation possibly pre-fetched */
pathname = ima_d_path(&file->f_path, &pathbuf, filename);
@@ -247,12 +248,14 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
if (action & IMA_MEASURE)
ima_store_measurement(iint, file, pathname,
xattr_value, xattr_len, pcr);
- if (action & IMA_APPRAISE_SUBMASK)
+ if (rc == 0 && (action & IMA_APPRAISE_SUBMASK))
rc = ima_appraise_measurement(func, iint, file, pathname,
xattr_value, xattr_len, opened);
if (action & IMA_AUDIT)
ima_audit_measurement(iint, pathname);
+ if ((file->f_flags & O_DIRECT) && (iint->flags & IMA_PERMIT_DIRECTIO))
+ rc = 0;
out_digsig:
if ((mask & MAY_WRITE) && (iint->flags & IMA_DIGSIG) &&
!(iint->flags & IMA_NEW_FILE))
@@ -359,12 +362,12 @@ void ima_post_path_mknod(struct dentry *dentry)
*/
int ima_read_file(struct file *file, enum kernel_read_file_id read_id)
{
+ bool sig_enforce = is_module_sig_enforced();
+
if (!file && read_id == READING_MODULE) {
-#ifndef CONFIG_MODULE_SIG_FORCE
- if ((ima_appraise & IMA_APPRAISE_MODULES) &&
+ if (!sig_enforce && (ima_appraise & IMA_APPRAISE_MODULES) &&
(ima_appraise & IMA_APPRAISE_ENFORCE))
return -EACCES; /* INTEGRITY_UNKNOWN */
-#endif
return 0; /* We rely on module signature checking */
}
return 0;
@@ -406,6 +409,10 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
if (!file && read_id == READING_MODULE) /* MODULE_SIG_FORCE enabled */
return 0;
+ /* permit signed certs */
+ if (!file && read_id == READING_X509_CERTIFICATE)
+ return 0;
+
if (!file || !buf || size == 0) { /* should never happen */
if (ima_appraise & IMA_APPRAISE_ENFORCE)
return -EACCES;
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 95209a5f8595..ee4613fa5840 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -196,9 +196,9 @@ static int __init policy_setup(char *str)
if ((strcmp(p, "tcb") == 0) && !ima_policy)
ima_policy = DEFAULT_TCB;
else if (strcmp(p, "appraise_tcb") == 0)
- ima_use_appraise_tcb = 1;
+ ima_use_appraise_tcb = true;
else if (strcmp(p, "secure_boot") == 0)
- ima_use_secure_boot = 1;
+ ima_use_secure_boot = true;
}
return 1;
@@ -207,7 +207,7 @@ __setup("ima_policy=", policy_setup);
static int __init default_appraise_policy_setup(char *str)
{
- ima_use_appraise_tcb = 1;
+ ima_use_appraise_tcb = true;
return 1;
}
__setup("ima_appraise_tcb", default_appraise_policy_setup);
generated by cgit (git 2.34.1) at 2024-05-27 17:37:32 +0000