[PATCH v5 03/11] kselftest: arm64: mangle_pstate_invalid_daif_bits
From: Cristian Marussi <cristian.marussi@arm.com>
Date: 2019-09-02 11:30:44
Also in:
linux-kselftest
Subsystem:
arm64 port (aarch64 architecture), kernel selftest framework, the rest · Maintainers:
Catalin Marinas, Will Deacon, Shuah Khan, Linus Torvalds
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> --- 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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