Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "gcs.h"
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/*
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* A single garbage store to the gcs stack.
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* The asm inside must be unique, so disallow inlining.
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*/
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void __attribute__((noinline))
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test_gcsstr(void)
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{
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register uint64_t *ptr __asm__("x0") = gcspr();
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/* GCSSTR x1, x0 */
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__asm__("inst_gcsstr: .inst 0xd91f1c01" : : "r"(--ptr));
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}
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static void test_sigsegv(int sig, siginfo_t *info, void *vuc)
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{
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ucontext_t *uc = vuc;
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uint64_t inst_gcsstr;
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__asm__("adr %0, inst_gcsstr" : "=r"(inst_gcsstr));
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assert(uc->uc_mcontext.pc == inst_gcsstr);
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assert(info->si_code == SEGV_CPERR);
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/* TODO: Dig for ESR and verify syndrome. */
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exit(0);
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}
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int main()
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{
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struct sigaction sa = {
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.sa_sigaction = test_sigsegv,
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.sa_flags = SA_SIGINFO,
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};
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/* Enable GCSSTR and test the store succeeds. */
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enable_gcs(PR_SHADOW_STACK_WRITE);
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test_gcsstr();
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/* Disable GCSSTR and test the resulting sigsegv. */
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enable_gcs(0);
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if (sigaction(SIGSEGV, &sa, NULL) < 0) {
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perror("sigaction");
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exit(1);
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}
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test_gcsstr();
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abort();
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}
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