1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2019 ARM Limited
4 *
5 * Place a fake sigframe on the stack including a badly sized terminator
6 * record: on sigreturn Kernel must spot this attempt and the test case
7 * is expected to be terminated via SEGV.
8 */
9
10 #include <signal.h>
11 #include <ucontext.h>
12
13 #include "test_signals_utils.h"
14 #include "testcases.h"
15
16 struct fake_sigframe sf;
17
fake_sigreturn_bad_size_for_magic0_run(struct tdescr * td,siginfo_t * si,ucontext_t * uc)18 static int fake_sigreturn_bad_size_for_magic0_run(struct tdescr *td,
19 siginfo_t *si, ucontext_t *uc)
20 {
21 struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
22
23 /* just to fill the ucontext_t with something real */
24 if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
25 return 1;
26
27 /* at least HDR_SZ for the badly sized terminator. */
28 head = get_starting_head(shead, HDR_SZ, GET_SF_RESV_SIZE(sf), NULL);
29 if (!head)
30 return 0;
31
32 head->magic = 0;
33 head->size = HDR_SZ;
34 ASSERT_BAD_CONTEXT(&sf.uc);
35 fake_sigreturn(&sf, sizeof(sf), 0);
36
37 return 1;
38 }
39
40 struct tdescr tde = {
41 .name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
42 .descr = "Trigger a sigreturn using non-zero size terminator",
43 .sig_ok = SIGSEGV,
44 .timeout = 3,
45 .run = fake_sigreturn_bad_size_for_magic0_run,
46 };
47