2017-01-18 13:54:20

by Rabin Vincent

Subject: [PATCH] crypto: tcrypt - Add debug prints

From: Rabin Vincent <[email protected]>

tcrypt is very tight-lipped when it succeeds, but a bit more feedback
would be useful when developing or debugging crypto drivers, especially
since even a successful run ends with the module failing to insert. Add
a couple of debug prints, which can be enabled with dynamic debug:

Before:

# insmod tcrypt.ko mode=10
insmod: can't insert 'tcrypt.ko': Resource temporarily unavailable

After:

# insmod tcrypt.ko mode=10 dyndbg
tcrypt: testing ecb(aes)
tcrypt: testing cbc(aes)
tcrypt: testing lrw(aes)
tcrypt: testing xts(aes)
tcrypt: testing ctr(aes)
tcrypt: testing rfc3686(ctr(aes))
tcrypt: all tests passed
insmod: can't insert 'tcrypt.ko': Resource temporarily unavailable

Signed-off-by: Rabin Vincent <[email protected]>
---
crypto/tcrypt.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index ae22f05..9a11f3c 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -22,6 +22,8 @@
*
*/

+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <crypto/aead.h>
#include <crypto/hash.h>
#include <crypto/skcipher.h>
@@ -1010,6 +1012,8 @@ static inline int tcrypt_test(const char *alg)
{
int ret;

+ pr_debug("testing %s\n", alg);
+
ret = alg_test(alg, alg, 0, 0);
/* non-fips algs return -EINVAL in fips mode */
if (fips_enabled && ret == -EINVAL)
@@ -2059,6 +2063,8 @@ static int __init tcrypt_mod_init(void)
if (err) {
printk(KERN_ERR "tcrypt: one or more tests failed!\n");
goto err_free_tv;
+ } else {
+ pr_debug("all tests passed\n");
}

/* We intentionaly return -EAGAIN to prevent keeping the module,
--
2.1.4

2017-01-23 14:59:20

by Herbert Xu

Subject: Re: [PATCH] crypto: tcrypt - Add debug prints

On Wed, Jan 18, 2017 at 02:54:05PM +0100, Rabin Vincent wrote:
> From: Rabin Vincent <[email protected]>
>
> tcrypt is very tight-lipped when it succeeds, but a bit more feedback
> would be useful when developing or debugging crypto drivers, especially
> since even a successful run ends with the module failing to insert. Add
> a couple of debug prints, which can be enabled with dynamic debug:
>
> Before:
>
> # insmod tcrypt.ko mode=10
> insmod: can't insert 'tcrypt.ko': Resource temporarily unavailable
>
> After:
>
> # insmod tcrypt.ko mode=10 dyndbg
> tcrypt: testing ecb(aes)
> tcrypt: testing cbc(aes)
> tcrypt: testing lrw(aes)
> tcrypt: testing xts(aes)
> tcrypt: testing ctr(aes)
> tcrypt: testing rfc3686(ctr(aes))
> tcrypt: all tests passed
> insmod: can't insert 'tcrypt.ko': Resource temporarily unavailable
>
> Signed-off-by: Rabin Vincent <[email protected]>

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