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crypto: fips - only panic on bad/missing crypto mod signatures

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Per further discussion with NIST, the requirements for FIPS state that
we only need to panic the system on failed kernel module signature checks
for crypto subsystem modules. This moves the fips-mode-only module
signature check out of the generic module loading code, into the crypto
subsystem, at points where we can catch both algorithm module loads and
mode module loads. At the same time, make CONFIG_CRYPTO_FIPS dependent on
CONFIG_MODULE_SIG, as this is entirely necessary for FIPS mode.

v2: remove extraneous blank line, perform checks in static inline
function, drop no longer necessary fips.h include.

CC: "David S. Miller" <davem@davemloft.net>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Stephan Mueller <stephan.mueller@atsec.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jarod Wilson 2014-07-02 15:37:30 -04:00 committed by Herbert Xu
parent 8f312d64b5
commit 002c77a48b
3 changed files with 15 additions and 4 deletions
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1
crypto/Kconfig
View file

@ -24,6 +24,7 @@ comment "Crypto core or helper"
config CRYPTO_FIPS
bool "FIPS 200 compliance"
depends on (CRYPTO_ANSI_CPRNG || CRYTPO_DRBG) && !CRYPTO_MANAGER_DISABLE_TESTS
depends on MODULE_SIG
help
This options enables the fips boot option which is
required if you want to system to operate in a FIPS 200

14
crypto/algapi.c
View file

@ -41,8 +41,20 @@ static inline int crypto_set_driver_name(struct crypto_alg *alg)
return 0;
}
static inline void crypto_check_module_sig(struct module *mod)
{
#ifdef CONFIG_CRYPTO_FIPS
if (fips_enabled && mod && !mod->sig_ok)
panic("Module %s signature verification failed in FIPS mode\n",
mod->name);
#endif
return;
}
static int crypto_check_alg(struct crypto_alg *alg)
{
crypto_check_module_sig(alg->cra_module);
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
return -EINVAL;
@ -430,6 +442,8 @@ int crypto_register_template(struct crypto_template *tmpl)
down_write(&crypto_alg_sem);
crypto_check_module_sig(tmpl->module);
list_for_each_entry(q, &crypto_template_list, list) {
if (q == tmpl)
goto out;

4
kernel/module.c
View file

@ -60,7 +60,6 @@
#include <linux/jump_label.h>
#include <linux/pfn.h>
#include <linux/bsearch.h>
#include <linux/fips.h>
#include <uapi/linux/module.h>
#include "module-internal.h"
@ -2448,9 +2447,6 @@ static int module_sig_check(struct load_info *info)
}
/* Not having a signature is only an error if we're strict. */
if (err < 0 && fips_enabled)
panic("Module verification failed with error %d in FIPS mode\n",
err);
if (err == -ENOKEY && !sig_enforce)
err = 0;