On Mon, Sep 02, 2019 at 12:29:24pm +0100, Cristian Marussi wrote:
Add a simple mangle testcase which messes with the ucontext_t from within the signal handler, trying to set PSTATE DAIF bits to an invalid value (masking everything). Expects SIGSEGV on test PASS.
Signed-off-by: Cristian Marussi cristian.marussi@arm.com
Reviewed-by: Dave Martin Dave.Martin@arm.com
v3 --> v4
- fixed commit message
- added testcase comment description
.../mangle_pstate_invalid_daif_bits.c | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c new file mode 100644 index 000000000000..434b82597007 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +/*
- Copyright (C) 2019 ARM Limited
- Try to mangle the ucontext from inside a signal handler, mangling the
- DAIF bits in an illegal manner: this attempt must be spotted by Kernel
- and the test case is expected to be terminated via SEGV.
- */
+#include "test_signals_utils.h" +#include "testcases.h"
+static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si,
ucontext_t *uc)
+{
- ASSERT_GOOD_CONTEXT(uc);
- /*
* This config should trigger a SIGSEGV by Kernel when it checks
* the sigframe consistency in valid_user_regs() routine.
*/
- uc->uc_mcontext.pstate |= PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT;
- return 1;
+}
+struct tdescr tde = {
.sanity_disabled = true,
.name = "MANGLE_PSTATE_INVALID_DAIF_BITS",
.descr = "Mangling uc_mcontext with INVALID DAIF_BITS",
.sig_trig = SIGUSR1,
.sig_ok = SIGSEGV,
.run = mangle_invalid_pstate_run,
+};
2.17.1
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