[v4,10/17] firmware_loader: Use security_post_load_data()
diff mbox series

Message ID 20200729175845.1745471-11-keescook@chromium.org
State New
Headers show
Series
  • Introduce partial kernel_read_file() support
Related show

Commit Message

Kees Cook July 29, 2020, 5:58 p.m. UTC
Now that security_post_load_data() is wired up, use it instead
of the NULL file argument style of security_post_read_file(),
and update the security_kernel_load_data() call to indicate that a
security_kernel_post_load_data() call is expected.

Wire up the IMA check to match earlier logic. Perhaps a generalized
change to ima_post_load_data() might look something like this:

    return process_buffer_measurement(buf, size,
                                      kernel_load_data_id_str(load_id),
                                      read_idmap[load_id] ?: FILE_CHECK,
                                      0, NULL);

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/base/firmware_loader/fallback.c       |  8 ++++----
 .../base/firmware_loader/fallback_platform.c  |  7 ++++++-
 security/integrity/ima/ima_main.c             | 20 +++++++++----------
 3 files changed, 20 insertions(+), 15 deletions(-)

Comments

Mimi Zohar Aug. 6, 2020, 10:07 p.m. UTC | #1
On Wed, 2020-07-29 at 10:58 -0700, Kees Cook wrote:
> Now that security_post_load_data() is wired up, use it instead
> of the NULL file argument style of security_post_read_file(),
> and update the security_kernel_load_data() call to indicate that a
> security_kernel_post_load_data() call is expected.
> 
> Wire up the IMA check to match earlier logic. Perhaps a generalized
> change to ima_post_load_data() might look something like this:
> 
>     return process_buffer_measurement(buf, size,
>                                       kernel_load_data_id_str(load_id),
>                                       read_idmap[load_id] ?: FILE_CHECK,
>                                       0, NULL);
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Other than one change and one question below, it looks good.

Reviewed-by:  Mimi Zohar <zohar@linux.ibm.com>

<snip>

> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index 85000dc8595c..1a7bc4c7437d 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c

> @@ -706,7 +697,7 @@ int ima_load_data(enum kernel_load_data_id id, bool contents)
>  		}
>  		break;
>  	case LOADING_FIRMWARE:
> -		if (ima_enforce && (ima_appraise & IMA_APPRAISE_FIRMWARE)) {
> +		if (ima_enforce && (ima_appraise & IMA_APPRAISE_FIRMWARE) && !contents) {
>  			pr_err("Prevent firmware sysfs fallback loading.\n");

Appended signatures are limited to kernel modules and, more recently,
to the kexec kernel image, not firmware.  Without a file descriptor,
file signatures stored as an xattrs are not applicable either.  We
might as well fail earlier, rather than later.  Adding "!contents" is
unnecessary.

>  			return -EACCES;	/* INTEGRITY_UNKNOWN */
>  		}
> @@ -739,6 +730,15 @@ int ima_load_data(enum kernel_load_data_id id, bool contents)
>   */
>  int ima_post_load_data(char *buf, loff_t size, enum kernel_load_data_id load_id)
>  {
> +	if (load_id == LOADING_FIRMWARE) {
> +		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
> +		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {
> +			pr_err("Prevent firmware loading_store.\n");
> +			return -EACCES; /* INTEGRITY_UNKNOWN */
> +		}
> +		return 0;
> +	}

Even with failing LOADING_FIRMWARE early in ima_load_data(), is this
still needed for fw_sysfs_loading()?

thanks,

Mimi

> +
>  	return 0;
>  }
>

Patch
diff mbox series

diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
index a196aacce22c..7cfdfdcb819c 100644
--- a/drivers/base/firmware_loader/fallback.c
+++ b/drivers/base/firmware_loader/fallback.c
@@ -272,9 +272,9 @@  static ssize_t firmware_loading_store(struct device *dev,
 				dev_err(dev, "%s: map pages failed\n",
 					__func__);
 			else
-				rc = security_kernel_post_read_file(NULL,
-						fw_priv->data, fw_priv->size,
-						READING_FIRMWARE);
+				rc = security_kernel_post_load_data(fw_priv->data,
+						fw_priv->size,
+						LOADING_FIRMWARE);
 
 			/*
 			 * Same logic as fw_load_abort, only the DONE bit
@@ -613,7 +613,7 @@  static bool fw_run_sysfs_fallback(u32 opt_flags)
 		return false;
 
 	/* Also permit LSMs and IMA to fail firmware sysfs fallback */
-	ret = security_kernel_load_data(LOADING_FIRMWARE, false);
+	ret = security_kernel_load_data(LOADING_FIRMWARE, true);
 	if (ret < 0)
 		return false;
 
diff --git a/drivers/base/firmware_loader/fallback_platform.c b/drivers/base/firmware_loader/fallback_platform.c
index a12c79d47efc..4d1157af0e86 100644
--- a/drivers/base/firmware_loader/fallback_platform.c
+++ b/drivers/base/firmware_loader/fallback_platform.c
@@ -17,7 +17,7 @@  int firmware_fallback_platform(struct fw_priv *fw_priv, u32 opt_flags)
 	if (!(opt_flags & FW_OPT_FALLBACK_PLATFORM))
 		return -ENOENT;
 
-	rc = security_kernel_load_data(LOADING_FIRMWARE, false);
+	rc = security_kernel_load_data(LOADING_FIRMWARE, true);
 	if (rc)
 		return rc;
 
@@ -27,6 +27,11 @@  int firmware_fallback_platform(struct fw_priv *fw_priv, u32 opt_flags)
 
 	if (fw_priv->data && size > fw_priv->allocated_size)
 		return -ENOMEM;
+
+	rc = security_kernel_post_load_data((u8 *)data, size, LOADING_FIRMWARE);
+	if (rc)
+		return rc;
+
 	if (!fw_priv->data)
 		fw_priv->data = vmalloc(size);
 	if (!fw_priv->data)
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 85000dc8595c..1a7bc4c7437d 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -648,15 +648,6 @@  int ima_post_read_file(struct file *file, void *buf, loff_t size,
 	enum ima_hooks func;
 	u32 secid;
 
-	if (!file && read_id == READING_FIRMWARE) {
-		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
-		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {
-			pr_err("Prevent firmware loading_store.\n");
-			return -EACCES;	/* INTEGRITY_UNKNOWN */
-		}
-		return 0;
-	}
-
 	/* permit signed certs */
 	if (!file && read_id == READING_X509_CERTIFICATE)
 		return 0;
@@ -706,7 +697,7 @@  int ima_load_data(enum kernel_load_data_id id, bool contents)
 		}
 		break;
 	case LOADING_FIRMWARE:
-		if (ima_enforce && (ima_appraise & IMA_APPRAISE_FIRMWARE)) {
+		if (ima_enforce && (ima_appraise & IMA_APPRAISE_FIRMWARE) && !contents) {
 			pr_err("Prevent firmware sysfs fallback loading.\n");
 			return -EACCES;	/* INTEGRITY_UNKNOWN */
 		}
@@ -739,6 +730,15 @@  int ima_load_data(enum kernel_load_data_id id, bool contents)
  */
 int ima_post_load_data(char *buf, loff_t size, enum kernel_load_data_id load_id)
 {
+	if (load_id == LOADING_FIRMWARE) {
+		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
+		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {
+			pr_err("Prevent firmware loading_store.\n");
+			return -EACCES; /* INTEGRITY_UNKNOWN */
+		}
+		return 0;
+	}
+
 	return 0;
 }