From: Nicolai Stange <nstange@suse.de>
Date: Tue, 30 Nov 2021 14:10:08 +0000 (+0100)
Subject: crypto: jitter - don't limit ->health_failure check to FIPS mode
X-Git-Tag: v6.6.17~8477^2~73
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b454fb702515276041b701a4eda468b6cd6b384d;p=platform%2Fkernel%2Flinux-rpi.git

crypto: jitter - don't limit ->health_failure check to FIPS mode

The jitterentropy's Repetition Count Test (RCT) as well as the Adaptive
Proportion Test (APT) are run unconditionally on any collected samples.
However, their result, i.e. ->health_failure, will only get checked if
fips_enabled is set, c.f. the jent_health_failure() wrapper.

I would argue that a RCT or APT failure indicates that something's
seriously off and that this should always be reported as an error,
independently of whether FIPS mode is enabled or not: it should be up to
callers whether or not and how to handle jitterentropy failures.

Make jent_health_failure() to unconditionally return ->health_failure,
independent of whether fips_enabled is set.

Note that fips_enabled isn't accessed from the jitterentropy code anymore
now. Remove the linux/fips.h include as well as the jent_fips_enabled()
wrapper.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Reviewed-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/jitterentropy-kcapi.c b/crypto/jitterentropy-kcapi.c
index e8a4165..2d115be 100644
--- a/crypto/jitterentropy-kcapi.c
+++ b/crypto/jitterentropy-kcapi.c
@@ -40,7 +40,6 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/fips.h>
 #include <linux/time.h>
 #include <crypto/internal/rng.h>
 
@@ -60,11 +59,6 @@ void jent_zfree(void *ptr)
 	kfree_sensitive(ptr);
 }
 
-int jent_fips_enabled(void)
-{
-	return fips_enabled;
-}
-
 void jent_panic(char *s)
 {
 	panic("%s", s);
diff --git a/crypto/jitterentropy.c b/crypto/jitterentropy.c
index 788d907..24e087c 100644
--- a/crypto/jitterentropy.c
+++ b/crypto/jitterentropy.c
@@ -298,10 +298,6 @@ static int jent_stuck(struct rand_data *ec, __u64 current_delta)
  */
 static int jent_health_failure(struct rand_data *ec)
 {
-	/* Test is only enabled in FIPS mode */
-	if (!jent_fips_enabled())
-		return 0;
-
 	return ec->health_failure;
 }
 
diff --git a/crypto/jitterentropy.h b/crypto/jitterentropy.h
index c83fff3..b7397b6 100644
--- a/crypto/jitterentropy.h
+++ b/crypto/jitterentropy.h
@@ -2,7 +2,6 @@
 
 extern void *jent_zalloc(unsigned int len);
 extern void jent_zfree(void *ptr);
-extern int jent_fips_enabled(void);
 extern void jent_panic(char *s);
 extern void jent_memcpy(void *dest, const void *src, unsigned int n);
 extern void jent_get_nstime(__u64 *out);