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kselftest: arm64: mangle_pstate_invalid_daif_bits

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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.

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 18:57:08 +01:00 committed by Catalin Marinas
parent f96bf43403
commit 0fc89f08df
1 changed files with 35 additions and 0 deletions
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35
tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.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, 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,
};