89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2023 ARM Limited
|
|
*/
|
|
|
|
#include <signal.h>
|
|
#include <ucontext.h>
|
|
#include <sys/prctl.h>
|
|
|
|
#include "test_signals_utils.h"
|
|
#include "testcases.h"
|
|
|
|
static union {
|
|
ucontext_t uc;
|
|
char buf[1024 * 64];
|
|
} context;
|
|
|
|
static int gcs_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
|
|
{
|
|
size_t offset;
|
|
struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
|
|
struct gcs_context *gcs;
|
|
unsigned long expected, gcspr;
|
|
uint64_t *u64_val;
|
|
int ret;
|
|
|
|
ret = prctl(PR_GET_SHADOW_STACK_STATUS, &expected, 0, 0, 0);
|
|
if (ret != 0) {
|
|
fprintf(stderr, "Unable to query GCS status\n");
|
|
return 1;
|
|
}
|
|
|
|
/* We expect a cap to be added to the GCS in the signal frame */
|
|
gcspr = get_gcspr_el0();
|
|
gcspr -= 8;
|
|
fprintf(stderr, "Expecting GCSPR_EL0 %lx\n", gcspr);
|
|
|
|
if (!get_current_context(td, &context.uc, sizeof(context))) {
|
|
fprintf(stderr, "Failed getting context\n");
|
|
return 1;
|
|
}
|
|
|
|
/* Ensure that the signal restore token was consumed */
|
|
u64_val = (uint64_t *)get_gcspr_el0() + 1;
|
|
if (*u64_val) {
|
|
fprintf(stderr, "GCS value at %p is %lx not 0\n",
|
|
u64_val, *u64_val);
|
|
return 1;
|
|
}
|
|
|
|
fprintf(stderr, "Got context\n");
|
|
|
|
head = get_header(head, GCS_MAGIC, GET_BUF_RESV_SIZE(context),
|
|
&offset);
|
|
if (!head) {
|
|
fprintf(stderr, "No GCS context\n");
|
|
return 1;
|
|
}
|
|
|
|
gcs = (struct gcs_context *)head;
|
|
|
|
/* Basic size validation is done in get_current_context() */
|
|
|
|
if (gcs->features_enabled != expected) {
|
|
fprintf(stderr, "Features enabled %llx but expected %lx\n",
|
|
gcs->features_enabled, expected);
|
|
return 1;
|
|
}
|
|
|
|
if (gcs->gcspr != gcspr) {
|
|
fprintf(stderr, "Got GCSPR %llx but expected %lx\n",
|
|
gcs->gcspr, gcspr);
|
|
return 1;
|
|
}
|
|
|
|
fprintf(stderr, "GCS context validated\n");
|
|
td->pass = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct tdescr tde = {
|
|
.name = "GCS basics",
|
|
.descr = "Validate a GCS signal context",
|
|
.feats_required = FEAT_GCS,
|
|
.timeout = 3,
|
|
.run = gcs_regs,
|
|
};
|