Introduce the digests_count interface, which shows the current number of items stored in the hash table by type.
Reported-by: kernel test robot lkp@intel.com (frame size warning) Signed-off-by: Roberto Sassu roberto.sassu@huawei.com --- security/integrity/diglim/fs.c | 48 ++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)
diff --git a/security/integrity/diglim/fs.c b/security/integrity/diglim/fs.c index e383254c72a4..467ff4f7c0ce 100644 --- a/security/integrity/diglim/fs.c +++ b/security/integrity/diglim/fs.c @@ -24,6 +24,7 @@ #include "diglim.h"
#define MAX_DIGEST_LIST_SIZE (64 * 1024 * 1024 - 1) +#define TMPBUF_SIZE 512
static struct dentry *diglim_dir; /** @@ -37,6 +38,13 @@ static struct dentry *diglim_dir; * removed. */ static struct dentry *digest_lists_loaded_dir; +/** + * DOC: digests_count + * + * digests_count shows the current number of digests stored in the hash + * table by type. + */ +static struct dentry *digests_count; /** * DOC: digest_list_label * @@ -74,6 +82,39 @@ static struct dentry *digest_list_del_dentry; char digest_query[CRYPTO_MAX_ALG_NAME + 1 + IMA_MAX_DIGEST_SIZE * 2 + 1]; char digest_list_label[NAME_MAX + 1];
+static char *types_str[COMPACT__LAST] = { + [COMPACT_PARSER] = "Parser", + [COMPACT_FILE] = "File", + [COMPACT_METADATA] = "Metadata", + [COMPACT_DIGEST_LIST] = "Digest list", +}; + +static ssize_t diglim_show_htable_len(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + char *tmpbuf; + ssize_t ret, len = 0; + int i; + + tmpbuf = kmalloc(TMPBUF_SIZE, GFP_KERNEL); + if (!tmpbuf) + return -ENOMEM; + + for (i = 0; i < COMPACT__LAST; i++) + len += scnprintf(tmpbuf + len, TMPBUF_SIZE - len, + "%s digests: %lu\n", types_str[i], + diglim_htable[i].len); + + ret = simple_read_from_buffer(buf, count, ppos, tmpbuf, len); + kfree(tmpbuf); + return ret; +} + +static const struct file_operations htable_len_ops = { + .read = diglim_show_htable_len, + .llseek = generic_file_llseek, +}; + static int parse_digest_list_filename(const char *digest_list_filename, u8 *digest, enum hash_algo *algo) { @@ -779,6 +820,12 @@ static int __init diglim_fs_init(void) if (IS_ERR(digest_lists_loaded_dir)) goto out;
+ digests_count = securityfs_create_file("digests_count", 0440, + diglim_dir, NULL, + &htable_len_ops); + if (IS_ERR(digests_count)) + goto out; + digest_list_add_dentry = securityfs_create_file("digest_list_add", 0200, diglim_dir, NULL, &digest_list_upload_ops); @@ -809,6 +856,7 @@ static int __init diglim_fs_init(void) securityfs_remove(digest_list_label_dentry); securityfs_remove(digest_list_del_dentry); securityfs_remove(digest_list_add_dentry); + securityfs_remove(digests_count); securityfs_remove(digest_lists_loaded_dir); securityfs_remove(diglim_dir); return -1;