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_daif_bits.c (930B)

      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, mangling the
      6 * DAIF bits in an illegal manner: this attempt must be spotted by Kernel
      7 * and the test case is expected to be terminated via SEGV.
      8 *
      9 */
     10
     11#include "test_signals_utils.h"
     12#include "testcases.h"
     13
     14static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si,
     15				     ucontext_t *uc)
     16{
     17	ASSERT_GOOD_CONTEXT(uc);
     18
     19	/*
     20	 * This config should trigger a SIGSEGV by Kernel when it checks
     21	 * the sigframe consistency in valid_user_regs() routine.
     22	 */
     23	uc->uc_mcontext.pstate |= PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT;
     24
     25	return 1;
     26}
     27
     28struct tdescr tde = {
     29		.sanity_disabled = true,
     30		.name = "MANGLE_PSTATE_INVALID_DAIF_BITS",
     31		.descr = "Mangling uc_mcontext with INVALID DAIF_BITS",
     32		.sig_trig = SIGUSR1,
     33		.sig_ok = SIGSEGV,
     34		.run = mangle_invalid_pstate_run,
     35};