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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023 ARM Limited
*/
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include "test_signals_utils.h"
#include "testcases.h"
static uint64_t *gcs_page;
#ifndef __NR_map_shadow_stack
#define __NR_map_shadow_stack 453
#endif
static bool alloc_gcs(struct tdescr *td)
{
long page_size = sysconf(_SC_PAGE_SIZE);
gcs_page = (void *)syscall(__NR_map_shadow_stack, 0,
page_size, 0);
if (gcs_page == MAP_FAILED) {
fprintf(stderr, "Failed to map %ld byte GCS: %d\n",
page_size, errno);
return false;
}
return true;
}
static int gcs_write_fault_trigger(struct tdescr *td)
{
/* Verify that the page is readable (ie, not completely unmapped) */
fprintf(stderr, "Read value 0x%lx\n", gcs_page[0]);
/* A regular write should trigger a fault */
gcs_page[0] = EINVAL;
return 0;
}
static int gcs_write_fault_signal(struct tdescr *td, siginfo_t *si,
ucontext_t *uc)
{
ASSERT_GOOD_CONTEXT(uc);
return 1;
}
struct tdescr tde = {
.name = "GCS write fault",
.descr = "Normal writes to a GCS segfault",
.feats_required = FEAT_GCS,
.timeout = 3,
.sig_ok = SIGSEGV,
.sanity_disabled = true,
.init = alloc_gcs,
.trigger = gcs_write_fault_trigger,
.run = gcs_write_fault_signal,
};
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