cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mangle_pstate_invalid_compat_toggle.c (811B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2019 ARM Limited
      4 *
      5 * Try to mangle the ucontext from inside a signal handler, toggling
      6 * the execution state bit: this attempt must be spotted by Kernel and
      7 * the test case is expected to be terminated via SEGV.
      8 */
      9
     10#include "test_signals_utils.h"
     11#include "testcases.h"
     12
     13static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si,
     14				     ucontext_t *uc)
     15{
     16	ASSERT_GOOD_CONTEXT(uc);
     17
     18	/* This config should trigger a SIGSEGV by Kernel */
     19	uc->uc_mcontext.pstate ^= PSR_MODE32_BIT;
     20
     21	return 1;
     22}
     23
     24struct tdescr tde = {
     25		.sanity_disabled = true,
     26		.name = "MANGLE_PSTATE_INVALID_STATE_TOGGLE",
     27		.descr = "Mangling uc_mcontext with INVALID STATE_TOGGLE",
     28		.sig_trig = SIGUSR1,
     29		.sig_ok = SIGSEGV,
     30		.run = mangle_invalid_pstate_run,
     31};