kselftest: arm64: fake_sigreturn_bad_size_for_magic0
Add a simple fake_sigreturn testcase which builds a ucontext_t with a badly sized terminator record and place it onto the stack. Expects a SIGSEGV on test PASS. Reviewed-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 ARM Limited
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*
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* Place a fake sigframe on the stack including a badly sized terminator
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* record: on sigreturn Kernel must spot this attempt and the test case
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* is expected to be terminated via SEGV.
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*/
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#include <signal.h>
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#include <ucontext.h>
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#include "test_signals_utils.h"
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#include "testcases.h"
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struct fake_sigframe sf;
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static int fake_sigreturn_bad_size_for_magic0_run(struct tdescr *td,
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siginfo_t *si, ucontext_t *uc)
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{
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struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
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/* just to fill the ucontext_t with something real */
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if (!get_current_context(td, &sf.uc))
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return 1;
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/* at least HDR_SZ for the badly sized terminator. */
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head = get_starting_head(shead, HDR_SZ, GET_SF_RESV_SIZE(sf), NULL);
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if (!head)
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return 0;
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head->magic = 0;
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head->size = HDR_SZ;
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ASSERT_BAD_CONTEXT(&sf.uc);
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fake_sigreturn(&sf, sizeof(sf), 0);
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return 1;
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}
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struct tdescr tde = {
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.name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
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.descr = "Trigger a sigreturn using non-zero size terminator",
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.sig_ok = SIGSEGV,
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.timeout = 3,
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.run = fake_sigreturn_bad_size_for_magic0_run,
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};
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