linux-kernel - [PATCH 3.4 81/92] crypto: api - Only abort operations on fatal signal

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Date:	Mon, 18 Apr 2016 18:46:26 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 81/92] crypto: api - Only abort operations on fatal signal

From: Herbert Xu <herbert@...dor.apana.org.au>

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 3fc89adb9fa4beff31374a4bf50b3d099d88ae83 upstream.

Currently a number of Crypto API operations may fail when a signal
occurs.  This causes nasty problems as the caller of those operations
are often not in a good position to restart the operation.

In fact there is currently no need for those operations to be
interrupted by user signals at all.  All we need is for them to
be killable.

This patch replaces the relevant calls of signal_pending with
fatal_signal_pending, and wait_for_completion_interruptible with
wait_for_completion_killable, respectively.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 crypto/ablkcipher.c  | 2 +-
 crypto/algapi.c      | 2 +-
 crypto/api.c         | 6 +++---
 crypto/crypto_user.c | 2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 45fe410..4a9c499 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -700,7 +700,7 @@ struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
 err:
 		if (err != -EAGAIN)
 			break;
-		if (signal_pending(current)) {
+		if (fatal_signal_pending(current)) {
 			err = -EINTR;
 			break;
 		}
diff --git a/crypto/algapi.c b/crypto/algapi.c
index b4c046c..7bae610 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -342,7 +342,7 @@ static void crypto_wait_for_test(struct crypto_larval *larval)
 		crypto_alg_tested(larval->alg.cra_driver_name, 0);
 	}
 
-	err = wait_for_completion_interruptible(&larval->completion);
+	err = wait_for_completion_killable(&larval->completion);
 	WARN_ON(err);
 
 out:
diff --git a/crypto/api.c b/crypto/api.c
index 4f98dd5..c9c2f47 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -178,7 +178,7 @@ static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
 	struct crypto_larval *larval = (void *)alg;
 	long timeout;
 
-	timeout = wait_for_completion_interruptible_timeout(
+	timeout = wait_for_completion_killable_timeout(
 		&larval->completion, 60 * HZ);
 
 	alg = larval->adult;
@@ -441,7 +441,7 @@ struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
 err:
 		if (err != -EAGAIN)
 			break;
-		if (signal_pending(current)) {
+		if (fatal_signal_pending(current)) {
 			err = -EINTR;
 			break;
 		}
@@ -558,7 +558,7 @@ void *crypto_alloc_tfm(const char *alg_name,
 err:
 		if (err != -EAGAIN)
 			break;
-		if (signal_pending(current)) {
+		if (fatal_signal_pending(current)) {
 			err = -EINTR;
 			break;
 		}
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 910497b..0c19d03 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -350,7 +350,7 @@ static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type,
 		err = PTR_ERR(alg);
 		if (err != -EAGAIN)
 			break;
-		if (signal_pending(current)) {
+		if (fatal_signal_pending(current)) {
 			err = -EINTR;
 			break;
 		}
-- 
1.9.1