^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Stas Sergeev <stsp@users.sourceforge.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * test sigaltstack(SS_ONSTACK | SS_AUTODISARM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * If that succeeds, then swapcontext() can be used inside sighandler safely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define _GNU_SOURCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <alloca.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "../kselftest.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #ifndef SS_AUTODISARM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define SS_AUTODISARM (1U << 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static void *sstack, *ustack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static ucontext_t uc, sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static const char *msg = "[OK]\tStack preserved";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static const char *msg2 = "[FAIL]\tStack corrupted";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct stk_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) char msg[128];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) void my_usr1(int sig, siginfo_t *si, void *u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) char *aa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) stack_t stk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct stk_data *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #if __s390x__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) register unsigned long sp asm("%15");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) register unsigned long sp asm("sp");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (sp < (unsigned long)sstack ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) sp >= (unsigned long)sstack + SIGSTKSZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) ksft_exit_fail_msg("SP is not on sigaltstack\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* put some data on stack. other sighandler will try to overwrite it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) aa = alloca(1024);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) assert(aa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) p = (struct stk_data *)(aa + 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) strcpy(p->msg, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) p->flag = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ksft_print_msg("[RUN]\tsignal USR1\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) err = sigaltstack(NULL, &stk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ksft_exit_fail_msg("sigaltstack() - %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (stk.ss_flags != SS_DISABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ksft_test_result_fail("tss_flags=%x, should be SS_DISABLE\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) stk.ss_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ksft_test_result_pass(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) "sigaltstack is disabled in sighandler\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) swapcontext(&sc, &uc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ksft_print_msg("%s\n", p->msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (!p->flag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ksft_exit_fail_msg("[RUN]\tAborting\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) void my_usr2(int sig, siginfo_t *si, void *u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) char *aa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct stk_data *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) ksft_print_msg("[RUN]\tsignal USR2\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) aa = alloca(1024);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* dont run valgrind on this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* try to find the data stored by previous sighandler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) p = memmem(aa, 1024, msg, strlen(msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ksft_test_result_fail("sigaltstack re-used\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* corrupt the data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) strcpy(p->msg, msg2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* tell other sighandler that his data is corrupted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) p->flag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static void switch_fn(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ksft_print_msg("[RUN]\tswitched to user ctx\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) raise(SIGUSR2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) setcontext(&sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct sigaction act;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) stack_t stk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) ksft_print_header();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ksft_set_plan(3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) sigemptyset(&act.sa_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) act.sa_flags = SA_ONSTACK | SA_SIGINFO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) act.sa_sigaction = my_usr1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) sigaction(SIGUSR1, &act, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) act.sa_sigaction = my_usr2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) sigaction(SIGUSR2, &act, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) sstack = mmap(NULL, SIGSTKSZ, PROT_READ | PROT_WRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (sstack == MAP_FAILED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ksft_exit_fail_msg("mmap() - %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return EXIT_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) err = sigaltstack(NULL, &stk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ksft_exit_fail_msg("sigaltstack() - %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (stk.ss_flags == SS_DISABLE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ksft_test_result_pass(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) "Initial sigaltstack state was SS_DISABLE\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ksft_exit_fail_msg("Initial sigaltstack state was %x; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) "should have been SS_DISABLE\n", stk.ss_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return EXIT_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) stk.ss_sp = sstack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) stk.ss_size = SIGSTKSZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) stk.ss_flags = SS_ONSTACK | SS_AUTODISARM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) err = sigaltstack(&stk, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (errno == EINVAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) ksft_test_result_skip(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) "[NOTE]\tThe running kernel doesn't support SS_AUTODISARM\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * If test cases for the !SS_AUTODISARM variant were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * added, we could still run them. We don't have any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * test cases like that yet, so just exit and report
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ksft_exit_fail_msg(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) "sigaltstack(SS_ONSTACK | SS_AUTODISARM) %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return EXIT_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ustack = mmap(NULL, SIGSTKSZ, PROT_READ | PROT_WRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (ustack == MAP_FAILED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) ksft_exit_fail_msg("mmap() - %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return EXIT_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) getcontext(&uc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) uc.uc_link = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) uc.uc_stack.ss_sp = ustack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) uc.uc_stack.ss_size = SIGSTKSZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) makecontext(&uc, switch_fn, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) raise(SIGUSR1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) err = sigaltstack(NULL, &stk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) ksft_exit_fail_msg("sigaltstack() - %s\n", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (stk.ss_flags != SS_AUTODISARM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ksft_exit_fail_msg("ss_flags=%x, should be SS_AUTODISARM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) stk.ss_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) ksft_test_result_pass(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) "sigaltstack is still SS_AUTODISARM after signal\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) ksft_exit_pass();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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