[PATCH] crypto: testmgr - WARN on test failure

[PATCH] crypto: testmgr - WARN on test failure

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Currently, by default crypto self-test failures only result in a
pr_warn() message and an "unknown" status in /proc/crypto.  Both of
these are easy to miss.  There is also an option to panic the kernel
when a test fails, but that can't be the default behavior.

A crypto self-test failure always indicates a kernel bug, however, and
there's already a standard way to report (recoverable) kernel bugs --
the WARN() family of macros.  WARNs are noisier and harder to miss, and
existing test systems already know to look for them in dmesg or via
/proc/sys/kernel/tainted.

Therefore, call WARN() when an algorithm fails its self-tests.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 crypto/testmgr.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index a64a639eddfa4..403d27c3e5165 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -5677,15 +5677,21 @@ int alg_test(const char *driver, const char *alg, u32 type, u32 mask)
 					     type, mask);
 
 test_done:
-	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 (rc) {
+		if (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");
+		}
+		WARN(1, "alg: self-tests for %s (%s) failed (rc=%d)",
+		     driver, alg, rc);
+	} else {
+		if (fips_enabled)
+			pr_info("alg: self-tests for %s (%s) passed\n",
+				driver, alg);
 	}
 
-	if (fips_enabled && !rc)
-		pr_info("alg: self-tests for %s (%s) passed\n", driver, alg);
-
 	return rc;
 
 notest:

base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
-- 
2.29.1

Re: [PATCH] crypto: testmgr - WARN on test failure

[Herbert Xu]

Eric Biggers <ebiggers@kernel.org> wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> Currently, by default crypto self-test failures only result in a
> pr_warn() message and an "unknown" status in /proc/crypto.  Both of
> these are easy to miss.  There is also an option to panic the kernel
> when a test fails, but that can't be the default behavior.
> 
> A crypto self-test failure always indicates a kernel bug, however, and
> there's already a standard way to report (recoverable) kernel bugs --
> the WARN() family of macros.  WARNs are noisier and harder to miss, and
> existing test systems already know to look for them in dmesg or via
> /proc/sys/kernel/tainted.
> 
> Therefore, call WARN() when an algorithm fails its self-tests.
> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>
> ---
> crypto/testmgr.c | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt