This patch introduces the file 'digest_lists' in the securityfs filesystem,
to load digest lists metadata. IMA will parse the metadata and load the
digest lists from the path provided.
It also introduces 'digests_count', to show the number of digests stored in
the ima_digests_htable hash table.
Signed-off-by: Roberto Sassu <roberto.sa...@huawei.com>
Changelog
v1:
- Deny upload of digest lists if no policy is loaded
---
security/integrity/ima/ima_fs.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 4158ced5d3c9..1ed717d94487 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -34,11 +34,15 @@ static struct dentry *ascii_runtime_measurements;
static struct dentry *runtime_measurements_count;
static struct dentry *violations;
static struct dentry *ima_policy;
+static struct dentry *digest_lists;
+static struct dentry *digests_count;
static enum kernel_read_file_id ima_get_file_id(struct dentry *dentry)
{
if (dentry == ima_policy)
return READING_POLICY;
+ else if (dentry == digest_lists)
+ return READING_DIGEST_LIST_METADATA;
return READING_UNKNOWN;
}
@@ -66,6 +70,8 @@ static ssize_t ima_show_htable_value(struct file *filp, char
__user *buf,
val = &ima_htable.violations;
else if (filp->f_path.dentry == runtime_measurements_count)
val = &ima_htable.len;
+ else if (filp->f_path.dentry == digests_count)
+ val = &ima_digests_htable.len;
len = scnprintf(tmpbuf, TMPBUFLEN, "%li\n", atomic_long_read(val));
return simple_read_from_buffer(buf, count, ppos, tmpbuf, len);
@@ -301,6 +307,9 @@ static ssize_t ima_read_file(char *path, enum
kernel_read_file_id file_id)
pr_debug("rule: %s\n", p);
rc = ima_parse_add_rule(p);
+ } else if (file_id == READING_DIGEST_LIST_METADATA) {
+ rc = ima_parse_digest_list_metadata(size, datap);
+ datap += rc;
}
if (rc < 0)
break;
@@ -401,7 +410,8 @@ static int ima_open_data_upload(struct inode *inode, struct
file *filp)
read_allowed = true;
seq_ops = &ima_policy_seqops;
#endif
- }
+ } else if (file_id == READING_DIGEST_LIST_METADATA && !ima_policy_flag)
+ return -EACCES;
if (!(filp->f_flags & O_WRONLY)) {
if (!read_allowed)
@@ -510,8 +520,22 @@ int __init ima_fs_init(void)
if (IS_ERR(ima_policy))
goto out;
+#ifdef CONFIG_IMA_DIGEST_LIST
+ digest_lists = securityfs_create_file("digest_lists", S_IWUSR, ima_dir,
+ NULL, &ima_data_upload_ops);
+ if (IS_ERR(digest_lists))
+ goto out;
+
+ digests_count = securityfs_create_file("digests_count",
+ S_IRUSR | S_IRGRP, ima_dir,
+ NULL, &ima_htable_value_ops);
+ if (IS_ERR(digests_count))
+ goto out;
+#endif
return 0;
out:
+ securityfs_remove(digests_count);
+ securityfs_remove(digest_lists);
securityfs_remove(violations);
securityfs_remove(runtime_measurements_count);
securityfs_remove(ascii_runtime_measurements);
--
2.11.0
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