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@xxxxxxx>
>> ---
>> 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@xxxxxxx>
>
Thanks
Cheers
Cristian
