On Tue, Dec 22, 2020 at 05:53:12PM -0800, Chang S. Bae wrote:
> +static int setup_altstack(void *start, unsigned long size)
> +{
> + stack_t ss;
> +
> + memset(&ss, 0, sizeof(ss));
> + ss.ss_size = size;
> + ss.ss_sp = start;
> +
> + return sigaltstack(&ss, NULL);
> +}
> +
> +static jmp_buf jmpbuf;
> +
> +static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
> +{
> + if (sigalrm_expected) {
> + printf("[FAIL]\tSIGSEGV signal delivery is wrong.\n");
"Wrong signal delivered: SIGSEGV (expected
SIGALRM)."
> + nerrs++;
> + } else {
> + printf("[OK]\tSIGSEGV signal is delivered.\n");
s/is //
> + }
> +
> + siglongjmp(jmpbuf, 1);
> +}
> +
> +static void sigalrm(int sig, siginfo_t *info, void *ctx_void)
> +{
> + if (!sigalrm_expected) {
> + printf("[FAIL]\tSIGALRM sigal delivery is wrong.\n");
See above.
> + nerrs++;
> + } else {
> + printf("[OK]\tSIGALRM signal is delivered.\n");
Ditto.
> + }
> +}
> +
> +static void test_sigaltstack(void *altstack, unsigned long size)
> +{
> + if (setup_altstack(altstack, size))
> + err(1, "sigaltstack()");
> +
> + sigalrm_expected = (size > at_minstack_size) ? true : false;
> +
> + sethandler(SIGSEGV, sigsegv, 0);
> + sethandler(SIGALRM, sigalrm, SA_ONSTACK);
> +
> + if (sigsetjmp(jmpbuf, 1) == 0) {
if (!sigsetjmp...)
> + printf("[RUN]\tTest an (%s) alternate signal stack\n",
"Test an alternate signal stack of %ssufficient size.\n"
> + sigalrm_expected ? "enough" : "too-small");
"" : "in");
> + printf("\tRaise SIGALRM. %s is expected to be delivered.\n",
> + sigalrm_expected ? "It" : "But SIGSEGV");
"It" : "SIGSEGV"
Drop "But".
Ask if something's not clear.
--
Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG
Nürnberg
