crypto: testmgr - add panic_on_fail module parameter

Add a module parameter cryptomgr.panic_on_fail which causes the kernel
to panic if any crypto self-tests fail.

Use cases:

- More easily detect crypto self-test failures by boot testing,
  e.g. on KernelCI.
- Get a bug report if syzkaller manages to use the template system to
  instantiate an algorithm that fails its self-tests.

The command-line option "fips=1" already does this, but it also makes
other changes not wanted for general testing, such as disabling
"unapproved" algorithms.  panic_on_fail just does what it says.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 2 deletions

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 2c2ddebb48d3..0f6bfb6ce6a4 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -45,6 +45,9 @@ static bool notests;
 module_param(notests, bool, 0644);
 MODULE_PARM_DESC(notests, "disable crypto self-tests");
 
+static bool panic_on_fail;
+module_param(panic_on_fail, bool, 0444);
+
 #ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
 static bool noextratests;
 module_param(noextratests, bool, 0644);
@@ -4109,8 +4112,9 @@ int alg_test(const char *driver, const char *alg, u32 type, u32 mask)
                                              type, mask);
 
 test_done:
-        if (fips_enabled && rc)
-                panic("%s: %s alg self test failed in fips mode!\n", driver, alg);
+        if (rc && (fips_enabled || panic_on_fail))
+                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);