* [LTP] [PATCH v1] crypto/af_alg02: fixed read() being stuck
@ 2019-05-07 6:55 Christian Amann
2019-05-07 8:07 ` Li Wang
0 siblings, 1 reply; 4+ messages in thread
From: Christian Amann @ 2019-05-07 6:55 UTC (permalink / raw)
To: ltp
On kernels < 4.14 (missing commit 2d97591ef43d) reading from
the request socket does not return and the testcase does not
finish.
This fix moves the logic to a child thread in order for the
parent to handle the timeout and report a message to the user.
Signed-off-by: Christian Amann <camann@suse.com>
---
testcases/kernel/crypto/Makefile | 2 ++
testcases/kernel/crypto/af_alg02.c | 36 +++++++++++++++++++++++++++++++++++-
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/testcases/kernel/crypto/Makefile b/testcases/kernel/crypto/Makefile
index 76f9308c2..6547e1cb6 100644
--- a/testcases/kernel/crypto/Makefile
+++ b/testcases/kernel/crypto/Makefile
@@ -20,3 +20,5 @@ include $(top_srcdir)/include/mk/testcases.mk
CFLAGS += -D_GNU_SOURCE
include $(top_srcdir)/include/mk/generic_leaf_target.mk
+
+af_alg02: CFLAGS += -pthread
diff --git a/testcases/kernel/crypto/af_alg02.c b/testcases/kernel/crypto/af_alg02.c
index a9e820423..056511993 100644
--- a/testcases/kernel/crypto/af_alg02.c
+++ b/testcases/kernel/crypto/af_alg02.c
@@ -7,12 +7,23 @@
* Regression test for commit ecaaab564978 ("crypto: salsa20 - fix
* blkcipher_walk API usage"), or CVE-2017-17805. This test verifies that an
* empty message can be encrypted with Salsa20 without crashing the kernel.
+ *
+ * read() fix:
+ * Calls read() in child thread in order to manually kill it after timeout.
+ * With kernels missing commit 2d97591ef43d ("crypto: af_alg - consolidation
+ * of duplicate code") read() does not return.
*/
#include "tst_test.h"
#include "tst_af_alg.h"
+#include "tst_safe_pthread.h"
+#include <pthread.h>
+#include <time.h>
+#include <errno.h>
-static void run(void)
+#define VERIFY_TIMEOUT (time(NULL) + 5)
+
+void *verify_encrypt(void *arg)
{
char buf[16];
int reqfd = tst_alg_setup_reqfd("skcipher", "salsa20", NULL, 16);
@@ -22,6 +33,29 @@ static void run(void)
tst_res(TPASS, "Successfully \"encrypted\" an empty message");
else
tst_res(TBROK, "read() didn't return 0");
+ return arg;
+}
+
+static void run(void)
+{
+ pthread_t thr;
+ int join_ret;
+ struct timespec read_timeout;
+
+ read_timeout.tv_sec = VERIFY_TIMEOUT;
+ read_timeout.tv_nsec = 0;
+
+ SAFE_PTHREAD_CREATE(&thr, NULL, verify_encrypt, NULL);
+ join_ret = pthread_timedjoin_np(thr, NULL, &read_timeout);
+
+ if (join_ret != 0) {
+ if (join_ret == ETIMEDOUT)
+ tst_brk(TBROK,
+ "Timed out while reading from request socket.");
+ else
+ tst_brk(TBROK | TTERRNO,
+ "Error while joining child thread");
+ }
}
static struct tst_test test = {
--
2.16.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [LTP] [PATCH v1] crypto/af_alg02: fixed read() being stuck
2019-05-07 6:55 [LTP] [PATCH v1] crypto/af_alg02: fixed read() being stuck Christian Amann
@ 2019-05-07 8:07 ` Li Wang
2019-05-07 8:59 ` Christian Amann
0 siblings, 1 reply; 4+ messages in thread
From: Li Wang @ 2019-05-07 8:07 UTC (permalink / raw)
To: ltp
Hi Christian,
On Tue, May 7, 2019 at 2:56 PM Christian Amann <camann@suse.com> wrote:
> On kernels < 4.14 (missing commit 2d97591ef43d) reading from
> the request socket does not return and the testcase does not
> finish.
>
> This fix moves the logic to a child thread in order for the
> parent to handle the timeout and report a message to the user.
>
> Signed-off-by: Christian Amann <camann@suse.com>
> ---
> testcases/kernel/crypto/Makefile | 2 ++
> testcases/kernel/crypto/af_alg02.c | 36
> +++++++++++++++++++++++++++++++++++-
> 2 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/testcases/kernel/crypto/Makefile
> b/testcases/kernel/crypto/Makefile
> index 76f9308c2..6547e1cb6 100644
> --- a/testcases/kernel/crypto/Makefile
> +++ b/testcases/kernel/crypto/Makefile
> @@ -20,3 +20,5 @@ include $(top_srcdir)/include/mk/testcases.mk
> CFLAGS += -D_GNU_SOURCE
>
> include $(top_srcdir)/include/mk/generic_leaf_target.mk
> +
> +af_alg02: CFLAGS += -pthread
> diff --git a/testcases/kernel/crypto/af_alg02.c
> b/testcases/kernel/crypto/af_alg02.c
> index a9e820423..056511993 100644
> --- a/testcases/kernel/crypto/af_alg02.c
> +++ b/testcases/kernel/crypto/af_alg02.c
> @@ -7,12 +7,23 @@
> * Regression test for commit ecaaab564978 ("crypto: salsa20 - fix
> * blkcipher_walk API usage"), or CVE-2017-17805. This test verifies
> that an
> * empty message can be encrypted with Salsa20 without crashing the
> kernel.
> + *
> + * read() fix:
> + * Calls read() in child thread in order to manually kill it after
> timeout.
> + * With kernels missing commit 2d97591ef43d ("crypto: af_alg -
> consolidation
> + * of duplicate code") read() does not return.
> */
>
> #include "tst_test.h"
> #include "tst_af_alg.h"
> +#include "tst_safe_pthread.h"
> +#include <pthread.h>
> +#include <time.h>
> +#include <errno.h>
>
> -static void run(void)
> +#define VERIFY_TIMEOUT (time(NULL) + 5)
>
It is very neccessary to take some action before process being killed in
timeout. In LTP, we have an tst_timeout_remaining() function. Have a look?
> +
> +void *verify_encrypt(void *arg)
> {
> char buf[16];
> int reqfd = tst_alg_setup_reqfd("skcipher", "salsa20", NULL, 16);
> @@ -22,6 +33,29 @@ static void run(void)
> tst_res(TPASS, "Successfully \"encrypted\" an empty
> message");
> else
> tst_res(TBROK, "read() didn't return 0");
> + return arg;
> +}
> +
> +static void run(void)
> +{
> + pthread_t thr;
> + int join_ret;
> + struct timespec read_timeout;
> +
> + read_timeout.tv_sec = VERIFY_TIMEOUT;
> + read_timeout.tv_nsec = 0;
> +
> + SAFE_PTHREAD_CREATE(&thr, NULL, verify_encrypt, NULL);
> + join_ret = pthread_timedjoin_np(thr, NULL, &read_timeout);
> +
> + if (join_ret != 0) {
> + if (join_ret == ETIMEDOUT)
> + tst_brk(TBROK,
> + "Timed out while reading from request
> socket.");
> + else
> + tst_brk(TBROK | TTERRNO,
> + "Error while joining child thread");
> + }
> }
>
> static struct tst_test test = {
> --
> 2.16.4
>
>
> --
> Mailing list info: https://lists.linux.it/listinfo/ltp
>
--
Regards,
Li Wang
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* [LTP] [PATCH v1] crypto/af_alg02: fixed read() being stuck
2019-05-07 8:07 ` Li Wang
@ 2019-05-07 8:59 ` Christian Amann
2019-05-07 10:06 ` Li Wang
0 siblings, 1 reply; 4+ messages in thread
From: Christian Amann @ 2019-05-07 8:59 UTC (permalink / raw)
To: ltp
Hi Li,
Thanks for having a look at my patch. To my knowledge
/pthread_timedjoin_np/ does not kill the thread if it times out. It
returns ETIMEDOUT which, in this case, leads to the whole testcase
terminating.
I chose this method over setting test.timeout because this way an
informative error-message can be printed.
I may be missing the problem here. Can you point me in the right
direction why this is bad practice?
Kind regards,
Christian
On 07/05/2019 10:07, Li Wang wrote:
> Hi Christian,
>
> On Tue, May 7, 2019 at 2:56 PM Christian Amann <camann@suse.com
> <mailto:camann@suse.com>> wrote:
>
> On kernels < 4.14 (missing commit 2d97591ef43d) reading from
> the request socket does not return and the testcase does not
> finish.
>
> This fix moves the logic to a child thread in order for the
> parent to handle the timeout and report a message to the user.
>
> Signed-off-by: Christian Amann <camann@suse.com
> <mailto:camann@suse.com>>
> ---
> testcases/kernel/crypto/Makefile | 2 ++
> testcases/kernel/crypto/af_alg02.c | 36
> +++++++++++++++++++++++++++++++++++-
> 2 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/testcases/kernel/crypto/Makefile
> b/testcases/kernel/crypto/Makefile
> index 76f9308c2..6547e1cb6 100644
> --- a/testcases/kernel/crypto/Makefile
> +++ b/testcases/kernel/crypto/Makefile
> @@ -20,3 +20,5 @@ include $(top_srcdir)/include/mk/testcases.mk
> <http://testcases.mk>
> CFLAGS += -D_GNU_SOURCE
>
> include $(top_srcdir)/include/mk/generic_leaf_target.mk
> <http://generic_leaf_target.mk>
> +
> +af_alg02: CFLAGS += -pthread
> diff --git a/testcases/kernel/crypto/af_alg02.c
> b/testcases/kernel/crypto/af_alg02.c
> index a9e820423..056511993 100644
> --- a/testcases/kernel/crypto/af_alg02.c
> +++ b/testcases/kernel/crypto/af_alg02.c
> @@ -7,12 +7,23 @@
> * Regression test for commit ecaaab564978 ("crypto: salsa20 - fix
> * blkcipher_walk API usage"), or CVE-2017-17805. This test
> verifies that an
> * empty message can be encrypted with Salsa20 without crashing
> the kernel.
> + *
> + * read() fix:
> + * Calls read() in child thread in order to manually kill it
> after timeout.
> + * With kernels missing commit 2d97591ef43d ("crypto: af_alg -
> consolidation
> + * of duplicate code") read() does not return.
> */
>
> #include "tst_test.h"
> #include "tst_af_alg.h"
> +#include "tst_safe_pthread.h"
> +#include <pthread.h>
> +#include <time.h>
> +#include <errno.h>
>
> -static void run(void)
> +#define VERIFY_TIMEOUT (time(NULL) + 5)
>
>
> It is very neccessary to take some action before process being killed
> in timeout. In LTP, we have an tst_timeout_remaining() function. Have
> a look?
>
> +
> +void *verify_encrypt(void *arg)
> {
> char buf[16];
> int reqfd = tst_alg_setup_reqfd("skcipher", "salsa20",
> NULL, 16);
> @@ -22,6 +33,29 @@ static void run(void)
> tst_res(TPASS, "Successfully \"encrypted\" an
> empty message");
> else
> tst_res(TBROK, "read() didn't return 0");
> + return arg;
> +}
> +
> +static void run(void)
> +{
> + pthread_t thr;
> + int join_ret;
> + struct timespec read_timeout;
> +
> + read_timeout.tv_sec = VERIFY_TIMEOUT;
> + read_timeout.tv_nsec = 0;
> +
> + SAFE_PTHREAD_CREATE(&thr, NULL, verify_encrypt, NULL);
> + join_ret = pthread_timedjoin_np(thr, NULL, &read_timeout);
> +
> + if (join_ret != 0) {
> + if (join_ret == ETIMEDOUT)
> + tst_brk(TBROK,
> + "Timed out while reading from
> request socket.");
> + else
> + tst_brk(TBROK | TTERRNO,
> + "Error while joining child thread");
> + }
> }
>
> static struct tst_test test = {
> --
> 2.16.4
>
>
> --
> Mailing list info: https://lists.linux.it/listinfo/ltp
>
>
>
> --
> Regards,
> Li Wang
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* [LTP] [PATCH v1] crypto/af_alg02: fixed read() being stuck
2019-05-07 8:59 ` Christian Amann
@ 2019-05-07 10:06 ` Li Wang
0 siblings, 0 replies; 4+ messages in thread
From: Li Wang @ 2019-05-07 10:06 UTC (permalink / raw)
To: ltp
On Tue, May 7, 2019 at 4:59 PM Christian Amann <camann@suse.de> wrote:
> Hi Li,
>
> Thanks for having a look at my patch. To my knowledge
> *pthread_timedjoin_np* does not kill the thread if it times out. It
> returns ETIMEDOUT which, in this case, leads to the whole testcase
> terminating.
>
Yes, you method could be work but not elegant. AFAIK, pthread_timedjoin_np
is non-standard and first appeared in glibc in version 2.3.3
> I chose this method over setting test.timeout because this way an
> informative error-message can be printed.
>
> I may be missing the problem here. Can you point me in the right direction
> why this is bad practice?
>
Seems you misundertood my words:). I was not suggest to set timeout for the
test before. As I saw you define VERIFY_TIMEOUT by yourself and involves
many variables to revoke thread when it hits reading stuck. That looks a
bit redundant.
Maybe we can take use of tst_timeout_remaining() to make things simpler?
we could call:
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE)
at the start of parent, then creat thread to run test for a while of time,
until the tst_timeout_remaining() < 10sec, then call:
pthread_cancel(<thread_b_pid>)
At last, print something to declear if necessary.
--
Regards,
Li Wang
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2019-05-07 8:07 ` Li Wang
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2019-05-07 10:06 ` Li Wang
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