// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2019 ARM Limited
 *
 * Place a fake sigframe on the stack including a BAD Unknown magic
 * record: on sigreturn Kernel must spot this attempt and the test
 * case is expected to be terminated via SEGV.
 */

#include <signal.h>
#include <ucontext.h>

#include "test_signals_utils.h"
#include "testcases.h"

struct fake_sigframe sf;

static int fake_sigreturn_bad_magic_run(struct tdescr *td,
                                        siginfo_t *si, ucontext_t *uc)
{
        struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;

        /* just to fill the ucontext_t with something real */
        if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
                return 1;

        /* need at least 2*HDR_SZ space: KSFT_BAD_MAGIC + terminator. */
        head = get_starting_head(shead, HDR_SZ * 2, GET_SF_RESV_SIZE(sf), NULL);
        if (!head)
                return 0;

        /*
         * use a well known NON existent bad magic...something
         * we should pretty sure won't be ever defined in Kernel
         */
        head->magic = KSFT_BAD_MAGIC;
        head->size = HDR_SZ;
        write_terminator_record(GET_RESV_NEXT_HEAD(head));

        ASSERT_BAD_CONTEXT(&sf.uc);
        fake_sigreturn(&sf, sizeof(sf), 0);

        return 1;
}

struct tdescr tde = {
                .name = "FAKE_SIGRETURN_BAD_MAGIC",
                .descr = "Trigger a sigreturn with a sigframe with a bad magic",
                .sig_ok = SIGSEGV,
                .timeout = 3,
                .run = fake_sigreturn_bad_magic_run,
};