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crypto: fips - add FIPS test failure notification chain

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Crypto test failures in FIPS mode cause an immediate panic, but
on some system the cryptographic boundary extends beyond just
the Linux controlled domain.

Add a simple atomic notification chain to allow interested parties
to register to receive notification prior to us kicking the bucket.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gilad Ben-Yossef 2019-07-02 14:39:20 +03:00 committed by Herbert Xu
parent 76a95bd8f9
commit 9552389c46
3 changed files with 21 additions and 1 deletions
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11
crypto/fips.c
View File

@ -11,10 +11,14 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
int fips_enabled;
EXPORT_SYMBOL_GPL(fips_enabled);
ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
/* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
static int fips_enable(char *str)
{
@ -58,6 +62,13 @@ static void crypto_proc_fips_exit(void)
unregister_sysctl_table(crypto_sysctls);
}
void fips_fail_notify(void)
{
if (fips_enabled)
atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
}
EXPORT_SYMBOL_GPL(fips_fail_notify);
static int __init fips_init(void)
{
crypto_proc_fips_init();

4
crypto/testmgr.c
View File

@ -5240,9 +5240,11 @@ int alg_test(const char *driver, const char *alg, u32 type, u32 mask)
type, mask);
test_done:
if (rc && (fips_enabled || panic_on_fail))
if (rc && (fips_enabled || panic_on_fail)) {
fips_fail_notify();
panic("alg: self-tests for %s (%s) failed in %s mode!\n",
driver, alg, fips_enabled ? "fips" : "panic_on_fail");
}
if (fips_enabled && !rc)
pr_info("alg: self-tests for %s (%s) passed\n", driver, alg);

7
include/linux/fips.h
View File

@ -4,8 +4,15 @@
#ifdef CONFIG_CRYPTO_FIPS
extern int fips_enabled;
extern struct atomic_notifier_head fips_fail_notif_chain;
void fips_fail_notify(void);
#else
#define fips_enabled 0
static inline void fips_fail_notify(void) {}
#endif
#endif