1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2019 ARM Limited
4 *
5 * Place a fake sigframe on the stack missing the mandatory FPSIMD
6 * record: on sigreturn Kernel must spot this attempt and the test
7 * case is expected to be terminated via SEGV.
8 */
9
10 #include <stdio.h>
11 #include <signal.h>
12 #include <ucontext.h>
13
14 #include "test_signals_utils.h"
15 #include "testcases.h"
16
17 struct fake_sigframe sf;
18
19 static int fake_sigreturn_missing_fpsimd_run(struct tdescr *td,
20 siginfo_t *si, ucontext_t *uc)
21 {
22 size_t resv_sz, offset;
23 struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);
24
25 /* just to fill the ucontext_t with something real */
26 if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
27 return 1;
28
29 resv_sz = GET_SF_RESV_SIZE(sf);
30 head = get_header(head, FPSIMD_MAGIC, resv_sz, &offset);
31 if (head && resv_sz - offset >= HDR_SZ) {
32 fprintf(stderr, "Mangling template header. Spare space:%zd\n",
33 resv_sz - offset);
34 /* Just overwrite fpsmid_context */
35 write_terminator_record(head);
36
37 ASSERT_BAD_CONTEXT(&sf.uc);
38 fake_sigreturn(&sf, sizeof(sf), 0);
39 }
40
41 return 1;
42 }
43
44 struct tdescr tde = {
45 .name = "FAKE_SIGRETURN_MISSING_FPSIMD",
46 .descr = "Triggers a sigreturn with a missing fpsimd_context",
47 .sig_ok = SIGSEGV,
48 .timeout = 3,
49 .run = fake_sigreturn_missing_fpsimd_run,
50 };
51
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