crypto: testmgr - Trigger a panic when self test fails in FIPS mode

The FIPS specification requires that should self test for any supported
crypto algorithm fail during operation in fips mode, we need to prevent
the use of any crypto functionality until such time as the system can
be re-initialized.  Seems like the best way to handle that would be
to panic the system if we were in fips mode and failed a self test.
This patch implements that functionality.  I've built and run it
successfully.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 1 deletions

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index b828c6cf1b1d..308d9cffdc46 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -1801,6 +1801,7 @@ static int alg_find_test(const char *alg)
 int alg_test(const char *driver, const char *alg, u32 type, u32 mask)
 {
         int i;
+        int rc;
 
         if ((type & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_CIPHER) {
                 char nalg[CRYPTO_MAX_ALG_NAME];
@@ -1820,8 +1821,12 @@ int alg_test(const char *driver, const char *alg, u32 type, u32 mask)
         if (i < 0)
                 goto notest;
 
-        return alg_test_descs[i].test(alg_test_descs + i, driver,
+        rc = alg_test_descs[i].test(alg_test_descs + i, driver,
                                       type, mask);
+        if (fips_enabled && rc)
+                panic("%s: %s alg self test failed in fips mode!\n", driver, alg);
+
+        return rc;
 
 notest:
         printk(KERN_INFO "alg: No test for %s (%s)\n", alg, driver);