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Subject[PATCH v1 2/4] integrity: provide file reading API
Date
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
---
security/integrity/Kconfig | 3 +++
security/integrity/digsig.c | 41 +++++++++++++++++++++++++++++++++++++++++
security/integrity/integrity.h | 2 +-
3 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index 463219b..1f000c4 100644
--- a/security/integrity/Kconfig
+++ b/security/integrity/Kconfig
@@ -50,6 +50,9 @@ config INTEGRITY_AUDIT
be enabled by specifying 'integrity_audit=1' on the kernel
command line.

+config INTEGRITY_FILE_READ
+ def_bool n
+
source security/integrity/ima/Kconfig
source security/integrity/evm/Kconfig

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 8d4fbff..85d6662 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -18,6 +18,8 @@
#include <linux/cred.h>
#include <linux/key-type.h>
#include <linux/digsig.h>
+#include <linux/slab.h>
+#include <linux/file.h>

#include "integrity.h"

@@ -63,6 +65,45 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
return -EOPNOTSUPP;
}

+#ifdef CONFIG_INTEGRITY_FILE_READ
+int integrity_read_file(const char *path, char **data)
+{
+ struct file *file;
+ loff_t size;
+ char *buf;
+ int rc = -EINVAL;
+
+ file = filp_open(path, O_RDONLY, 0);
+ if (IS_ERR(file)) {
+ rc = PTR_ERR(file);
+ pr_err("Unable to open file: %s (%d)", path, rc);
+ return rc;
+ }
+
+ size = i_size_read(file_inode(file));
+ if (size <= 0)
+ goto out;
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (!buf) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* should be ima_kernel_read */
+ rc = kernel_read(file, 0, buf, size);
+ if (rc < 0)
+ kfree(buf);
+ else if (rc != size)
+ rc = -EIO;
+ else
+ *data = buf;
+out:
+ fput(file);
+ return rc;
+}
+#endif
+
int integrity_init_keyring(const unsigned int id)
{
const struct cred *cred = current_cred();
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 7656d47..f77de68 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -130,7 +130,7 @@ struct integrity_iint_cache *integrity_iint_find(struct inode *inode);

int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
const char *digest, int digestlen);
-
+int integrity_read_file(const char *path, char **data);
int integrity_init_keyring(const unsigned int id);
#else

--
1.9.1


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