Re: [PATCH v3 4/4] selftest/x86/signal: Include test cases for validating sigaltstack
From: Borislav Petkov <hidden>
Date: 2021-01-08 18:08:19
Also in:
linux-api, linux-kselftest, lkml
On Tue, Dec 22, 2020 at 05:53:12PM -0800, Chang S. Bae wrote:
quoted hunk ↗ jump to hunk
+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)."
quoted hunk ↗ jump to hunk
+ nerrs++; + } else { + printf("[OK]\tSIGSEGV signal is delivered.\n");
s/is //
quoted hunk ↗ jump to hunk
+ } + + 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.
quoted hunk ↗ jump to hunk
+ nerrs++; + } else { + printf("[OK]\tSIGALRM signal is delivered.\n");
Ditto.
quoted hunk ↗ jump to hunk
+ } +} + +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