From 7c9bc0983f890ed9782e755a0e070930cd979333 Mon Sep 17 00:00:00 2001 From: "Bruno E. O. Meneguele" Date: Tue, 24 Oct 2017 15:37:01 -0200 Subject: ima: check signature enforcement against cmdline param instead of CONFIG When the user requests MODULE_CHECK policy and its kernel is compiled with CONFIG_MODULE_SIG_FORCE not set, all modules would not load, just those loaded in initram time. One option the user would have would be set a kernel cmdline param (module.sig_enforce) to true, but the IMA module check code doesn't rely on this value, it checks just CONFIG_MODULE_SIG_FORCE. This patch solves this problem checking for the exported value of module.sig_enforce cmdline param intead of CONFIG_MODULE_SIG_FORCE, which holds the effective value (CONFIG || param). Signed-off-by: Bruno E. O. Meneguele Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'security') diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index d6ddaad91e82..770654694efc 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -362,12 +362,12 @@ void ima_post_path_mknod(struct dentry *dentry) */ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) { + bool sig_enforce = is_module_sig_enforced(); + if (!file && read_id == READING_MODULE) { -#ifndef CONFIG_MODULE_SIG_FORCE - if ((ima_appraise & IMA_APPRAISE_MODULES) && + if (!sig_enforce && (ima_appraise & IMA_APPRAISE_MODULES) && (ima_appraise & IMA_APPRAISE_ENFORCE)) return -EACCES; /* INTEGRITY_UNKNOWN */ -#endif return 0; /* We rely on module signature checking */ } return 0; -- cgit