diff mbox series

[v5,07/11] kselftest: arm64: fake_sigreturn_bad_size_for_magic0

Message ID 20190902112932.36129-8-cristian.marussi@arm.com (mailing list archive)
State New
Headers show
Series Add arm64/signal initial kselftest support | expand

Commit Message

Cristian Marussi Sept. 2, 2019, 11:29 a.m. UTC 
Add a simple fake_sigreturn testcase which builds a ucontext_t with a
badly sized terminator record and place it onto the stack.
Expects a SIGSEGV on test PASS.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
v3 --> v4
- fix commit
- add signal.h include
- using new get_starting_head() helper
- added test description
---
 .../fake_sigreturn_bad_size_for_magic0.c      | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c

Comments

Dave Martin Sept. 4, 2019, 11:49 a.m. UTC | #1 
On Mon, Sep 02, 2019 at 12:29:28pm +0100, Cristian Marussi wrote:
> Add a simple fake_sigreturn testcase which builds a ucontext_t with a
> badly sized terminator record and place it onto the stack.
> Expects a SIGSEGV on test PASS.
> 
> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
> ---
> v3 --> v4
> - fix commit
> - add signal.h include
> - using new get_starting_head() helper
> - added test description
> ---
>  .../fake_sigreturn_bad_size_for_magic0.c      | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
> 
> diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
> new file mode 100644
> index 000000000000..25017fe18214
> --- /dev/null
> +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
> @@ -0,0 +1,49 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019 ARM Limited
> + *
> + * Place a fake sigframe on the stack including a badly sized terminator
> + * record: on sigreturn Kernel must spot this attempt and the test case
> + * is expected to be terminated via SEGV.
> + */
> +
> +#include <signal.h>
> +#include <ucontext.h>
> +
> +#include "test_signals_utils.h"
> +#include "testcases.h"
> +
> +struct fake_sigframe sf;
> +
> +static int fake_sigreturn_bad_size_for_magic0_run(struct tdescr *td,
> +						  siginfo_t *si, ucontext_t *uc)
> +{
> +	size_t resv_sz, need_sz;
> +	struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
> +
> +	/* just to fill the ucontext_t with something real */
> +	if (!get_current_context(td, &sf.uc))
> +		return 1;
> +
> +	resv_sz = GET_SF_RESV_SIZE(sf);
> +	/* at least HDR_SZ for the badly sized terminator. */
> +	need_sz = HDR_SZ;

Nit: do we need the resv_sz and need_sz variables here?

> +	head = get_starting_head(shead, need_sz, resv_sz, NULL);
> +	if (head) {

Perhaps we could fail immediately rather than relying on timeout here?

Probably not a huge deal though.

> +		head->magic = 0;
> +		head->size = HDR_SZ;
> +
> +		ASSERT_BAD_CONTEXT(&sf.uc);
> +		fake_sigreturn(&sf, sizeof(sf), 0);
> +	}
> +
> +	return 1;
> +}
> +
> +struct tdescr tde = {
> +		.name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
> +		.descr = "Trigger a sigreturn using non-zero size terminator",
> +		.sig_ok = SIGSEGV,
> +		.timeout = 3,
> +		.run = fake_sigreturn_bad_size_for_magic0_run,
> +};

Either way,

Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Cristian Marussi Sept. 9, 2019, 5:47 p.m. UTC | #2 
On 04/09/2019 12:49, Dave Martin wrote:
> On Mon, Sep 02, 2019 at 12:29:28pm +0100, Cristian Marussi wrote:
>> Add a simple fake_sigreturn testcase which builds a ucontext_t with a
>> badly sized terminator record and place it onto the stack.
>> Expects a SIGSEGV on test PASS.
>>
>> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
>> ---
>> v3 --> v4
>> - fix commit
>> - add signal.h include
>> - using new get_starting_head() helper
>> - added test description
>> ---
>>  .../fake_sigreturn_bad_size_for_magic0.c      | 49 +++++++++++++++++++
>>  1 file changed, 49 insertions(+)
>>  create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
>>
>> diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
>> new file mode 100644
>> index 000000000000..25017fe18214
>> --- /dev/null
>> +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
>> @@ -0,0 +1,49 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2019 ARM Limited
>> + *
>> + * Place a fake sigframe on the stack including a badly sized terminator
>> + * record: on sigreturn Kernel must spot this attempt and the test case
>> + * is expected to be terminated via SEGV.
>> + */
>> +
>> +#include <signal.h>
>> +#include <ucontext.h>
>> +
>> +#include "test_signals_utils.h"
>> +#include "testcases.h"
>> +
>> +struct fake_sigframe sf;
>> +
>> +static int fake_sigreturn_bad_size_for_magic0_run(struct tdescr *td,
>> +						  siginfo_t *si, ucontext_t *uc)
>> +{
>> +	size_t resv_sz, need_sz;
>> +	struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
>> +
>> +	/* just to fill the ucontext_t with something real */
>> +	if (!get_current_context(td, &sf.uc))
>> +		return 1;
>> +
>> +	resv_sz = GET_SF_RESV_SIZE(sf);
>> +	/* at least HDR_SZ for the badly sized terminator. */
>> +	need_sz = HDR_SZ;
> 
> Nit: do we need the resv_sz and need_sz variables here?
> 

No

>> +	head = get_starting_head(shead, need_sz, resv_sz, NULL);
>> +	if (head) {
> 
> Perhaps we could fail immediately rather than relying on timeout here?
> 
> Probably not a huge deal though.

Yes I'll do. (I'll review slightly the exit/termination strategy in main()
but it won't be a problem)

> 
>> +		head->magic = 0;
>> +		head->size = HDR_SZ;
>> +
>> +		ASSERT_BAD_CONTEXT(&sf.uc);
>> +		fake_sigreturn(&sf, sizeof(sf), 0);
>> +	}
>> +
>> +	return 1;
>> +}
>> +
>> +struct tdescr tde = {
>> +		.name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
>> +		.descr = "Trigger a sigreturn using non-zero size terminator",
>> +		.sig_ok = SIGSEGV,
>> +		.timeout = 3,
>> +		.run = fake_sigreturn_bad_size_for_magic0_run,
>> +};
> 
> Either way,
> 
> Reviewed-by: Dave Martin <Dave.Martin@arm.com>
> 

Thanks

Cheers

Cristian
diff mbox series

Patch

diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
new file mode 100644
index 000000000000..25017fe18214
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
@@ -0,0 +1,49 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 ARM Limited
+ *
+ * Place a fake sigframe on the stack including a badly sized terminator
+ * record: on sigreturn Kernel must spot this attempt and the test case
+ * is expected to be terminated via SEGV.
+ */
+
+#include <signal.h>
+#include <ucontext.h>
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+struct fake_sigframe sf;
+
+static int fake_sigreturn_bad_size_for_magic0_run(struct tdescr *td,
+						  siginfo_t *si, ucontext_t *uc)
+{
+	size_t resv_sz, need_sz;
+	struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
+
+	/* just to fill the ucontext_t with something real */
+	if (!get_current_context(td, &sf.uc))
+		return 1;
+
+	resv_sz = GET_SF_RESV_SIZE(sf);
+	/* at least HDR_SZ for the badly sized terminator. */
+	need_sz = HDR_SZ;
+	head = get_starting_head(shead, need_sz, resv_sz, NULL);
+	if (head) {
+		head->magic = 0;
+		head->size = HDR_SZ;
+
+		ASSERT_BAD_CONTEXT(&sf.uc);
+		fake_sigreturn(&sf, sizeof(sf), 0);
+	}
+
+	return 1;
+}
+
+struct tdescr tde = {
+		.name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
+		.descr = "Trigger a sigreturn using non-zero size terminator",
+		.sig_ok = SIGSEGV,
+		.timeout = 3,
+		.run = fake_sigreturn_bad_size_for_magic0_run,
+};