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kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht]

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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>
This commit is contained in:
Cristian Marussi 2019-10-25 18:57:09 +01:00 committed by Catalin Marinas
parent 0fc89f08df
commit c282098704
7 changed files with 118 additions and 0 deletions
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15
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1h.c Normal file
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// 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);

15
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1t.c Normal file
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// 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);

15
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2h.c Normal file
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// 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);

15
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2t.c Normal file
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// 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);

15
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3h.c Normal file
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// 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);

15
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3t.c Normal file
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// 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);

28
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_template.h Normal file
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/* 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, \
}