Replace fw_read_file_contents() for reading a file with the common VFS
kernel_read_file() function. Call the existing firmware security hook
from security_kernel_post_read_file() until the LSMs have been converted.
This patch retains the kernel_fw_from_file() hook, but removes the
security_kernel_fw_from_file() function.
Signed-off-by: Mimi Zohar <zohar at linux.vnet.ibm.com>
---
drivers/base/firmware_class.c | 51 +++++++++------------------------------
include/linux/ima.h | 6 -----
include/linux/security.h | 8 +-----
security/integrity/ima/ima_main.c | 18 ++++++--------
security/security.c | 24 ++++++++----------
5 files changed, 30 insertions(+), 77 deletions(-)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 3ca96a6..4e4e860 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -292,44 +292,10 @@ static const char * const fw_path[] = {
module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
-static int fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
-{
- int size;
- char *buf;
- int rc;
-
- if (!S_ISREG(file_inode(file)->i_mode))
- return -EINVAL;
- size = i_size_read(file_inode(file));
- if (size <= 0)
- return -EINVAL;
- buf = vmalloc(size);
- if (!buf)
- return -ENOMEM;
- rc = kernel_read(file, 0, buf, size);
- if (rc != size) {
- if (rc > 0)
- rc = -EIO;
- goto fail;
- }
- rc = ima_hash_and_process_file(file, buf, size, FIRMWARE_CHECK);
- if (rc)
- goto fail;
-
- rc = security_kernel_fw_from_file(file, buf, size);
- if (rc)
- goto fail;
- fw_buf->data = buf;
- fw_buf->size = size;
- return 0;
-fail:
- vfree(buf);
- return rc;
-}
-
static int fw_get_filesystem_firmware(struct device *device,
struct firmware_buf *buf)
{
+ loff_t size;
int i, len;
int rc = -ENOENT;
char *path;
@@ -355,13 +321,18 @@ static int fw_get_filesystem_firmware(struct device *device,
file = filp_open(path, O_RDONLY, 0);
if (IS_ERR(file))
continue;
- rc = fw_read_file_contents(file, buf);
+
+ buf->size = 0;
+ rc = kernel_read_file(file, &buf->data, &size, UINT_MAX,
+ FIRMWARE_CHECK);
fput(file);
if (rc)
dev_warn(device, "firmware, attempted to load %s, but failed with error %d\n",
path, rc);
- else
+ else {
+ buf->size = (size_t) size;
break;
+ }
}
__putname(path);
@@ -690,8 +661,10 @@ static ssize_t firmware_loading_store(struct device *dev,
dev_err(dev, "%s: map pages failed\n",
__func__);
else
- rc = security_kernel_fw_from_file(NULL,
- fw_buf->data, fw_buf->size);
+ rc = security_kernel_post_read_file(NULL,
+ fw_buf->data,
+ fw_buf->size,
+ FIRMWARE_CHECK);
/*
* Same logic as fw_load_abort, only the DONE bit
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 3790af0..7cad2e7 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -27,7 +27,6 @@ extern int ima_file_check(struct file *file, int mask, int opened);
extern void ima_file_free(struct file *file);
extern int ima_file_mmap(struct file *file, unsigned long prot);
extern int ima_module_check(struct file *file);
-extern int ima_fw_from_file(struct file *file, char *buf, size_t size);
extern int ima_hash_and_process_file(struct file *file,
void *buf, loff_t size,
enum ima_policy_id policy_id);
@@ -58,11 +57,6 @@ static inline int ima_module_check(struct file *file)
return 0;
}
-static inline int ima_fw_from_file(struct file *file, char *buf, size_t size)
-{
- return 0;
-}
-
static inline int ima_hash_and_process_file(struct file *file,
void *buf, loff_t size,
enum ima_policy_id policy_id)
diff --git a/include/linux/security.h b/include/linux/security.h
index 44d8832..51f3bc6 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -28,6 +28,7 @@
#include <linux/err.h>
#include <linux/string.h>
#include <linux/mm.h>
+#include <linux/ima.h>
struct linux_binprm;
struct cred;
@@ -298,7 +299,6 @@ int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp);
void security_transfer_creds(struct cred *new, const struct cred *old);
int security_kernel_act_as(struct cred *new, u32 secid);
int security_kernel_create_files_as(struct cred *new, struct inode *inode);
-int security_kernel_fw_from_file(struct file *file, char *buf, size_t size);
int security_kernel_module_request(char *kmod_name);
int security_kernel_module_from_file(struct file *file);
int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
@@ -852,12 +852,6 @@ static inline int security_kernel_create_files_as(struct cred *cred,
return 0;
}
-static inline int security_kernel_fw_from_file(struct file *file,
- char *buf, size_t size)
-{
- return 0;
-}
-
static inline int security_kernel_module_request(char *kmod_name)
{
return 0;
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index bfe1cc3..62d609d 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -337,17 +337,6 @@ int ima_module_check(struct file *file)
return process_measurement(file, NULL, 0, MAY_EXEC, MODULE_CHECK, 0);
}
-int ima_fw_from_file(struct file *file, char *buf, size_t size)
-{
- if (!file) {
- if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
- (ima_appraise & IMA_APPRAISE_ENFORCE))
- return -EACCES; /* INTEGRITY_UNKNOWN */
- return 0;
- }
- return 0;
-}
-
/**
* ima_hash_and_process_file - in memory collect/appraise/audit measurement
* @file: pointer to the file to be measured/appraised/audit
@@ -362,6 +351,13 @@ int ima_fw_from_file(struct file *file, char *buf, size_t size)
int ima_hash_and_process_file(struct file *file, void *buf, loff_t size,
enum ima_policy_id policy_id)
{
+ if (!file && policy_id == FIRMWARE_CHECK) {
+ if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
+ (ima_appraise & IMA_APPRAISE_ENFORCE))
+ return -EACCES; /* INTEGRITY_UNKNOWN */
+ return 0;
+ }
+
if (!file || !buf || size == 0) { /* should never happen */
if (ima_appraise & IMA_APPRAISE_ENFORCE)
return -EACCES;
diff --git a/security/security.c b/security/security.c
index e979c2d..a391ce4 100644
--- a/security/security.c
+++ b/security/security.c
@@ -884,17 +884,6 @@ int security_kernel_create_files_as(struct cred *new, struct inode *inode)
return call_int_hook(kernel_create_files_as, 0, new, inode);
}
-int security_kernel_fw_from_file(struct file *file, char *buf, size_t size)
-{
- int ret;
-
- ret = call_int_hook(kernel_fw_from_file, 0, file, buf, size);
- if (ret)
- return ret;
- return ima_fw_from_file(file, buf, size);
-}
-EXPORT_SYMBOL_GPL(security_kernel_fw_from_file);
-
int security_kernel_module_request(char *kmod_name)
{
return call_int_hook(kernel_module_request, 0, kmod_name);
@@ -913,10 +902,17 @@ int security_kernel_module_from_file(struct file *file)
int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
int policy_id)
{
- int ret;
+ int ret = 0;
- ret = call_int_hook(kernel_post_read_file, 0, file, buf, size,
- policy_id);
+ switch (policy_id) {
+ case FIRMWARE_CHECK:
+ ret = call_int_hook(kernel_fw_from_file, 0, file, buf, size);
+ break;
+ default:
+ ret = call_int_hook(kernel_post_read_file, 0, file, buf, size,
+ policy_id);
+ break;
+ }
if (ret)
return ret;
--
2.1.0
