From c2820987047c08d813396b2b1d8ac2894ba0bd5f Mon Sep 17 00:00:00 2001 From: Cristian Marussi <cristian.marussi@arm.com> Date: Fri, 25 Oct 2019 18:57:09 +0100 Subject: [PATCH] kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht] Add 6 simple mangle testcases that mess with the ucontext_t from within the signal handler, trying to toggle PSTATE mode bits to trick the system into switching to EL1/EL2/EL3 using both SP_EL0(t) and SP_ELx(h). Expects SIGSEGV on test PASS. Reviewed-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> --- .../mangle_pstate_invalid_mode_el1h.c | 15 ++++++++++ .../mangle_pstate_invalid_mode_el1t.c | 15 ++++++++++ .../mangle_pstate_invalid_mode_el2h.c | 15 ++++++++++ .../mangle_pstate_invalid_mode_el2t.c | 15 ++++++++++ .../mangle_pstate_invalid_mode_el3h.c | 15 ++++++++++ .../mangle_pstate_invalid_mode_el3t.c | 15 ++++++++++ .../mangle_pstate_invalid_mode_template.h | 28 +++++++++++++++++++ 7 files changed, 118 insertions(+) create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1h.c create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1t.c create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2h.c create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2t.c create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3h.c create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3t.c create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_template.h diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1h.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1h.c new file mode 100644 index 000000000000..95f821abdf46 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1h.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Try to mangle the ucontext from inside a signal handler, toggling + * the mode bit to escalate exception level: this attempt must be spotted + * by Kernel and the test case is expected to be termninated via SEGV. + */ + +#include "test_signals_utils.h" +#include "testcases.h" + +#include "mangle_pstate_invalid_mode_template.h" + +DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(1h); diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1t.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1t.c new file mode 100644 index 000000000000..cc222d8a618a --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1t.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Try to mangle the ucontext from inside a signal handler, toggling + * the mode bit to escalate exception level: this attempt must be spotted + * by Kernel and the test case is expected to be termninated via SEGV. + */ + +#include "test_signals_utils.h" +#include "testcases.h" + +#include "mangle_pstate_invalid_mode_template.h" + +DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(1t); diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2h.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2h.c new file mode 100644 index 000000000000..2188add7d28c --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2h.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Try to mangle the ucontext from inside a signal handler, toggling + * the mode bit to escalate exception level: this attempt must be spotted + * by Kernel and the test case is expected to be termninated via SEGV. + */ + +#include "test_signals_utils.h" +#include "testcases.h" + +#include "mangle_pstate_invalid_mode_template.h" + +DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(2h); diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2t.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2t.c new file mode 100644 index 000000000000..df32dd5a479c --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2t.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Try to mangle the ucontext from inside a signal handler, toggling + * the mode bit to escalate exception level: this attempt must be spotted + * by Kernel and the test case is expected to be termninated via SEGV. + */ + +#include "test_signals_utils.h" +#include "testcases.h" + +#include "mangle_pstate_invalid_mode_template.h" + +DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(2t); diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3h.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3h.c new file mode 100644 index 000000000000..9e6829b7e5db --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3h.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Try to mangle the ucontext from inside a signal handler, toggling + * the mode bit to escalate exception level: this attempt must be spotted + * by Kernel and the test case is expected to be termninated via SEGV. + */ + +#include "test_signals_utils.h" +#include "testcases.h" + +#include "mangle_pstate_invalid_mode_template.h" + +DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(3h); diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3t.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3t.c new file mode 100644 index 000000000000..5685a4f10d06 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3t.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Try to mangle the ucontext from inside a signal handler, toggling + * the mode bit to escalate exception level: this attempt must be spotted + * by Kernel and the test case is expected to be termninated via SEGV. + */ + +#include "test_signals_utils.h" +#include "testcases.h" + +#include "mangle_pstate_invalid_mode_template.h" + +DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(3t); diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_template.h b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_template.h new file mode 100644 index 000000000000..f5bf1804d858 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_template.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2019 ARM Limited + * + * Utility macro to ease definition of testcases toggling mode EL + */ + +#define DEFINE_TESTCASE_MANGLE_PSTATE_INVALID_MODE(_mode) \ + \ +static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si, \ + ucontext_t *uc) \ +{ \ + ASSERT_GOOD_CONTEXT(uc); \ + \ + uc->uc_mcontext.pstate &= ~PSR_MODE_MASK; \ + uc->uc_mcontext.pstate |= PSR_MODE_EL ## _mode; \ + \ + return 1; \ +} \ + \ +struct tdescr tde = { \ + .sanity_disabled = true, \ + .name = "MANGLE_PSTATE_INVALID_MODE_EL"#_mode, \ + .descr = "Mangling uc_mcontext INVALID MODE EL"#_mode, \ + .sig_trig = SIGUSR1, \ + .sig_ok = SIGSEGV, \ + .run = mangle_invalid_pstate_run, \ +}