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794b64ca56
Do some testing of the signal handling for GCS, checking that a GCS frame has the expected information in it and that the expected signals are delivered with invalid operations. Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> Tested-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-37-222b78d87eee@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2023 ARM Limited
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*/
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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#include "test_signals_utils.h"
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#include "testcases.h"
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static uint64_t *gcs_page;
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#ifndef __NR_map_shadow_stack
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#define __NR_map_shadow_stack 453
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#endif
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static bool alloc_gcs(struct tdescr *td)
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{
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long page_size = sysconf(_SC_PAGE_SIZE);
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gcs_page = (void *)syscall(__NR_map_shadow_stack, 0,
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page_size, 0);
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if (gcs_page == MAP_FAILED) {
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fprintf(stderr, "Failed to map %ld byte GCS: %d\n",
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page_size, errno);
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return false;
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}
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return true;
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}
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static int gcs_write_fault_trigger(struct tdescr *td)
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{
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/* Verify that the page is readable (ie, not completely unmapped) */
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fprintf(stderr, "Read value 0x%lx\n", gcs_page[0]);
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/* A regular write should trigger a fault */
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gcs_page[0] = EINVAL;
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return 0;
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}
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static int gcs_write_fault_signal(struct tdescr *td, siginfo_t *si,
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ucontext_t *uc)
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{
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ASSERT_GOOD_CONTEXT(uc);
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return 1;
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}
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struct tdescr tde = {
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.name = "GCS write fault",
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.descr = "Normal writes to a GCS segfault",
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.feats_required = FEAT_GCS,
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.timeout = 3,
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.sig_ok = SIGSEGV,
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.sanity_disabled = true,
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.init = alloc_gcs,
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.trigger = gcs_write_fault_trigger,
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.run = gcs_write_fault_signal,
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};
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