From mboxrd@z Thu Jan 1 00:00:00 1970 From: zohar@linux.vnet.ibm.com (Mimi Zohar) Date: Thu, 17 May 2018 10:48:48 -0400 Subject: [PATCH v2 7/9] ima: based on policy require signed firmware (sysfs fallback) In-Reply-To: <1526568530-9144-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1526568530-9144-1-git-send-email-zohar@linux.vnet.ibm.com> Message-ID: <1526568530-9144-8-git-send-email-zohar@linux.vnet.ibm.com> To: linux-security-module@vger.kernel.org List-Id: linux-security-module.vger.kernel.org With an IMA policy requiring signed firmware, this patch prevents the sysfs fallback method of loading firmware. Signed-off-by: Mimi Zohar Cc: Luis R. Rodriguez Cc: David Howells Cc: Matthew Garrett --- 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 7e1a127f18fe..29d1a929af5c 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -451,7 +451,17 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) } return 0; } + + if (read_id == READING_FIRMWARE_FALLBACK_SYSFS) { + 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 -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html