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72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "gcs.h"
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#define GCSPUSHM "sys #3, c7, c7, #0, %[push]"
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#define GCSPOPM "sysl %[pop], #3, c7, c7, #1"
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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_sigsegv;
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__asm__("adr %0, inst_sigsegv" : "=r"(inst_sigsegv));
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assert(uc->uc_mcontext.pc == inst_sigsegv);
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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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uc->uc_mcontext.pc += 4;
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}
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static void test_sigill(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_sigill;
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__asm__("adr %0, inst_sigill" : "=r"(inst_sigill));
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assert(uc->uc_mcontext.pc == inst_sigill);
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assert(info->si_code == ILL_ILLOPC);
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uc->uc_mcontext.pc += 4;
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}
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int main()
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{
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struct sigaction sa = { .sa_flags = SA_SIGINFO };
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uint64_t old, new;
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sa.sa_sigaction = test_sigsegv;
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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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sa.sa_sigaction = test_sigill;
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if (sigaction(SIGILL, &sa, NULL) < 0) {
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perror("sigaction");
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exit(1);
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}
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/* Pushm is disabled -- SIGILL via EC_SYSTEMREGISTERTRAP */
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asm volatile("inst_sigill:\t" GCSPUSHM
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: : [push] "r" (1));
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enable_gcs(PR_SHADOW_STACK_PUSH);
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/* Valid value -- low 2 bits clear */
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old = 0xdeadbeeffeedcaec;
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asm volatile(GCSPUSHM "\n\t" GCSPOPM
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: [pop] "=r" (new)
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: [push] "r" (old)
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: "memory");
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assert(old == new);
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/* Invalid value -- SIGSEGV via EC_GCS */
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asm volatile(GCSPUSHM "\n"
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"inst_sigsegv:\t" GCSPOPM
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: [pop] "=r" (new)
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: [push] "r" (1)
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: "memory");
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exit(0);
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}
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