lkml.org 
[lkml]   [2018]   [May]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/6] ima: prevent sysfs fallback firmware loading
Date
With an IMA policy requiring signed firmware, this patch prevents
the sysfs fallback method of loading firmware.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Matthew Garrett <mjg59@google.com>
---
security/integrity/ima/ima_main.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 754ece08e1c6..8759280dccf6 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -453,7 +453,17 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id)
}
return 0;
}
+
+ if (read_id == READING_FIRMWARE_FALLBACK) {
+ if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
+ (ima_appraise & IMA_APPRAISE_ENFORCE)) {
+ pr_err("Prevent firmware sysfs fallback loading.\n");
+ return -EACCES;
+ }
+ return 0;
+ }
return 0;
+
}

static int read_idmap[READING_MAX_ID] = {
--
2.7.5
\
 
 \ /
  Last update: 2018-05-01 15:51    [W:0.154 / U:2.884 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site