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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>
89 lines
1.9 KiB
C
89 lines
1.9 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 <signal.h>
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#include <ucontext.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 union {
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ucontext_t uc;
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char buf[1024 * 64];
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} context;
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static int gcs_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
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{
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size_t offset;
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struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
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struct gcs_context *gcs;
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unsigned long expected, gcspr;
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uint64_t *u64_val;
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int ret;
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ret = prctl(PR_GET_SHADOW_STACK_STATUS, &expected, 0, 0, 0);
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if (ret != 0) {
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fprintf(stderr, "Unable to query GCS status\n");
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return 1;
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}
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/* We expect a cap to be added to the GCS in the signal frame */
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gcspr = get_gcspr_el0();
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gcspr -= 8;
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fprintf(stderr, "Expecting GCSPR_EL0 %lx\n", gcspr);
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if (!get_current_context(td, &context.uc, sizeof(context))) {
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fprintf(stderr, "Failed getting context\n");
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return 1;
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}
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/* Ensure that the signal restore token was consumed */
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u64_val = (uint64_t *)get_gcspr_el0() + 1;
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if (*u64_val) {
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fprintf(stderr, "GCS value at %p is %lx not 0\n",
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u64_val, *u64_val);
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return 1;
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}
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fprintf(stderr, "Got context\n");
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head = get_header(head, GCS_MAGIC, GET_BUF_RESV_SIZE(context),
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&offset);
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if (!head) {
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fprintf(stderr, "No GCS context\n");
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return 1;
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}
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gcs = (struct gcs_context *)head;
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/* Basic size validation is done in get_current_context() */
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if (gcs->features_enabled != expected) {
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fprintf(stderr, "Features enabled %llx but expected %lx\n",
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gcs->features_enabled, expected);
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return 1;
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}
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if (gcs->gcspr != gcspr) {
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fprintf(stderr, "Got GCSPR %llx but expected %lx\n",
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gcs->gcspr, gcspr);
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return 1;
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}
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fprintf(stderr, "GCS context validated\n");
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td->pass = 1;
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return 0;
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}
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struct tdescr tde = {
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.name = "GCS basics",
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.descr = "Validate a GCS signal context",
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.feats_required = FEAT_GCS,
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.timeout = 3,
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.run = gcs_regs,
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};
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