diff options
Diffstat (limited to 'tools/testing/selftests/powerpc/signal')
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/.gitignore | 8 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/Makefile | 15 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/settings | 1 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c | 174 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/sigfuz.c | 325 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/signal.S | 46 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/signal.c | 107 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/signal_tm.c | 107 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/sigreturn_kernel.c | 132 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c | 43 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/signal/sigreturn_vdso.c | 127 |
11 files changed, 1085 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/signal/.gitignore b/tools/testing/selftests/powerpc/signal/.gitignore new file mode 100644 index 000000000..9d0915777 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/.gitignore @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only +signal +signal_tm +sigfuz +sigreturn_vdso +sig_sc_double_restart +sigreturn_kernel +sigreturn_unaligned diff --git a/tools/testing/selftests/powerpc/signal/Makefile b/tools/testing/selftests/powerpc/signal/Makefile new file mode 100644 index 000000000..f679d260a --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/Makefile @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 +TEST_GEN_PROGS := signal signal_tm sigfuz sigreturn_vdso sig_sc_double_restart +TEST_GEN_PROGS += sigreturn_kernel +TEST_GEN_PROGS += sigreturn_unaligned + +CFLAGS += -maltivec +$(OUTPUT)/signal_tm: CFLAGS += -mhtm +$(OUTPUT)/sigfuz: CFLAGS += -pthread -m64 + +TEST_FILES := settings + +top_srcdir = ../../../../.. +include ../../lib.mk + +$(TEST_GEN_PROGS): ../harness.c ../utils.c signal.S diff --git a/tools/testing/selftests/powerpc/signal/settings b/tools/testing/selftests/powerpc/signal/settings new file mode 100644 index 000000000..e7b941753 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/settings @@ -0,0 +1 @@ +timeout=0 diff --git a/tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c b/tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c new file mode 100644 index 000000000..e39722646 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Test that a syscall does not get restarted twice, handled by trap_norestart() + * + * Based on Al's description, and a test for the bug fixed in this commit: + * + * commit 9a81c16b527528ad307843be5571111aa8d35a80 + * Author: Al Viro <viro@zeniv.linux.org.uk> + * Date: Mon Sep 20 21:48:57 2010 +0100 + * + * powerpc: fix double syscall restarts + * + * Make sigreturn zero regs->trap, make do_signal() do the same on all + * paths. As it is, signal interrupting e.g. read() from fd 512 (== + * ERESTARTSYS) with another signal getting unblocked when the first + * handler finishes will lead to restart one insn earlier than it ought + * to. Same for multiple signals with in-kernel handlers interrupting + * that sucker at the same time. Same for multiple signals of any kind + * interrupting that sucker on 64bit... + */ +#define _GNU_SOURCE +#include <sys/types.h> +#include <sys/wait.h> +#include <sys/syscall.h> +#include <unistd.h> +#include <signal.h> +#include <errno.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +#include "utils.h" + +static void SIGUSR1_handler(int sig) +{ + kill(getpid(), SIGUSR2); + /* + * SIGUSR2 is blocked until the handler exits, at which point it will + * be raised again and think there is a restart to be done because the + * pending restarted syscall has 512 (ERESTARTSYS) in r3. The second + * restart will retreat NIP another 4 bytes to fail case branch. + */ +} + +static void SIGUSR2_handler(int sig) +{ +} + +static ssize_t raw_read(int fd, void *buf, size_t count) +{ + register long nr asm("r0") = __NR_read; + register long _fd asm("r3") = fd; + register void *_buf asm("r4") = buf; + register size_t _count asm("r5") = count; + + asm volatile( +" b 0f \n" +" b 1f \n" +" 0: sc 0 \n" +" bns 2f \n" +" neg %0,%0 \n" +" b 2f \n" +" 1: \n" +" li %0,%4 \n" +" 2: \n" + : "+r"(_fd), "+r"(nr), "+r"(_buf), "+r"(_count) + : "i"(-ENOANO) + : "memory", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "ctr", "cr0"); + + if (_fd < 0) { + errno = -_fd; + _fd = -1; + } + + return _fd; +} + +#define DATA "test 123" +#define DLEN (strlen(DATA)+1) + +int test_restart(void) +{ + int pipefd[2]; + pid_t pid; + char buf[512]; + + if (pipe(pipefd) == -1) { + perror("pipe"); + exit(EXIT_FAILURE); + } + + pid = fork(); + if (pid == -1) { + perror("fork"); + exit(EXIT_FAILURE); + } + + if (pid == 0) { /* Child reads from pipe */ + struct sigaction act; + int fd; + + memset(&act, 0, sizeof(act)); + sigaddset(&act.sa_mask, SIGUSR2); + act.sa_handler = SIGUSR1_handler; + act.sa_flags = SA_RESTART; + if (sigaction(SIGUSR1, &act, NULL) == -1) { + perror("sigaction"); + exit(EXIT_FAILURE); + } + + memset(&act, 0, sizeof(act)); + act.sa_handler = SIGUSR2_handler; + act.sa_flags = SA_RESTART; + if (sigaction(SIGUSR2, &act, NULL) == -1) { + perror("sigaction"); + exit(EXIT_FAILURE); + } + + /* Let's get ERESTARTSYS into r3 */ + while ((fd = dup(pipefd[0])) != 512) { + if (fd == -1) { + perror("dup"); + exit(EXIT_FAILURE); + } + } + + if (raw_read(fd, buf, 512) == -1) { + if (errno == ENOANO) { + fprintf(stderr, "Double restart moved restart before sc instruction.\n"); + _exit(EXIT_FAILURE); + } + perror("read"); + exit(EXIT_FAILURE); + } + + if (strncmp(buf, DATA, DLEN)) { + fprintf(stderr, "bad test string %s\n", buf); + exit(EXIT_FAILURE); + } + + return 0; + + } else { + int wstatus; + + usleep(100000); /* Hack to get reader waiting */ + kill(pid, SIGUSR1); + usleep(100000); + if (write(pipefd[1], DATA, DLEN) != DLEN) { + perror("write"); + exit(EXIT_FAILURE); + } + close(pipefd[0]); + close(pipefd[1]); + if (wait(&wstatus) == -1) { + perror("wait"); + exit(EXIT_FAILURE); + } + if (!WIFEXITED(wstatus)) { + fprintf(stderr, "child exited abnormally\n"); + exit(EXIT_FAILURE); + } + + FAIL_IF(WEXITSTATUS(wstatus) != EXIT_SUCCESS); + + return 0; + } +} + +int main(void) +{ + test_harness_set_timeout(10); + return test_harness(test_restart, "sig sys restart"); +} diff --git a/tools/testing/selftests/powerpc/signal/sigfuz.c b/tools/testing/selftests/powerpc/signal/sigfuz.c new file mode 100644 index 000000000..08f9afe3b --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/sigfuz.c @@ -0,0 +1,325 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2018, Breno Leitao, IBM Corp. + * Licensed under GPLv2. + * + * Sigfuz(tm): A PowerPC TM-aware signal fuzzer. + * + * This is a new selftest that raises SIGUSR1 signals and handles it in a set + * of different ways, trying to create different scenario for testing + * purpose. + * + * This test works raising a signal and calling sigreturn interleaved with + * TM operations, as starting, suspending and terminating a transaction. The + * test depends on random numbers, and, based on them, it sets different TM + * states. + * + * Other than that, the test fills out the user context struct that is passed + * to the sigreturn system call with random data, in order to make sure that + * the signal handler syscall can handle different and invalid states + * properly. + * + * This selftest has command line parameters to control what kind of tests the + * user wants to run, as for example, if a transaction should be started prior + * to signal being raised, or, after the signal being raised and before the + * sigreturn. If no parameter is given, the default is enabling all options. + * + * This test does not check if the user context is being read and set + * properly by the kernel. Its purpose, at this time, is basically + * guaranteeing that the kernel does not crash on invalid scenarios. + */ + +#include <stdio.h> +#include <limits.h> +#include <sys/wait.h> +#include <unistd.h> +#include <stdlib.h> +#include <signal.h> +#include <string.h> +#include <ucontext.h> +#include <sys/mman.h> +#include <pthread.h> +#include "utils.h" + +/* Selftest defaults */ +#define COUNT_MAX 600 /* Number of interactions */ +#define THREADS 16 /* Number of threads */ + +/* Arguments options */ +#define ARG_MESS_WITH_TM_AT 0x1 +#define ARG_MESS_WITH_TM_BEFORE 0x2 +#define ARG_MESS_WITH_MSR_AT 0x4 +#define ARG_FOREVER 0x10 +#define ARG_COMPLETE (ARG_MESS_WITH_TM_AT | \ + ARG_MESS_WITH_TM_BEFORE | \ + ARG_MESS_WITH_MSR_AT) + +static int args; +static int nthread = THREADS; +static int count_max = COUNT_MAX; + +/* checkpoint context */ +static ucontext_t *tmp_uc; + +/* Return true with 1/x probability */ +static int one_in_chance(int x) +{ + return rand() % x == 0; +} + +/* Change TM states */ +static void mess_with_tm(void) +{ + /* Starts a transaction 33% of the time */ + if (one_in_chance(3)) { + asm ("tbegin. ;" + "beq 8 ;"); + + /* And suspended half of them */ + if (one_in_chance(2)) + asm("tsuspend. ;"); + } + + /* Call 'tend' in 5% of the runs */ + if (one_in_chance(20)) + asm("tend. ;"); +} + +/* Signal handler that will be invoked with raise() */ +static void trap_signal_handler(int signo, siginfo_t *si, void *uc) +{ + ucontext_t *ucp = uc; + + ucp->uc_link = tmp_uc; + + /* + * Set uc_link in three possible ways: + * - Setting a single 'int' in the whole chunk + * - Cloning ucp into uc_link + * - Allocating a new memory chunk + */ + if (one_in_chance(3)) { + memset(ucp->uc_link, rand(), sizeof(ucontext_t)); + } else if (one_in_chance(2)) { + memcpy(ucp->uc_link, uc, sizeof(ucontext_t)); + } else if (one_in_chance(2)) { + if (tmp_uc) { + free(tmp_uc); + tmp_uc = NULL; + } + tmp_uc = malloc(sizeof(ucontext_t)); + ucp->uc_link = tmp_uc; + /* Trying to cause a major page fault at Kernel level */ + madvise(ucp->uc_link, sizeof(ucontext_t), MADV_DONTNEED); + } + + if (args & ARG_MESS_WITH_MSR_AT) { + /* Changing the checkpointed registers */ + if (one_in_chance(4)) { + ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] |= MSR_TS_S; + } else { + if (one_in_chance(2)) { + ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] |= + MSR_TS_T; + } else if (one_in_chance(2)) { + ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] |= + MSR_TS_T | MSR_TS_S; + } + } + + /* Checking the current register context */ + if (one_in_chance(2)) { + ucp->uc_mcontext.gp_regs[PT_MSR] |= MSR_TS_S; + } else if (one_in_chance(2)) { + if (one_in_chance(2)) + ucp->uc_mcontext.gp_regs[PT_MSR] |= + MSR_TS_T; + else if (one_in_chance(2)) + ucp->uc_mcontext.gp_regs[PT_MSR] |= + MSR_TS_T | MSR_TS_S; + } + } + + if (one_in_chance(20)) { + /* Nested transaction start */ + if (one_in_chance(5)) + mess_with_tm(); + + /* Return without changing any other context info */ + return; + } + + if (one_in_chance(10)) + ucp->uc_mcontext.gp_regs[PT_MSR] = random(); + if (one_in_chance(10)) + ucp->uc_mcontext.gp_regs[PT_NIP] = random(); + if (one_in_chance(10)) + ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] = random(); + if (one_in_chance(10)) + ucp->uc_link->uc_mcontext.gp_regs[PT_NIP] = random(); + + ucp->uc_mcontext.gp_regs[PT_TRAP] = random(); + ucp->uc_mcontext.gp_regs[PT_DSISR] = random(); + ucp->uc_mcontext.gp_regs[PT_DAR] = random(); + ucp->uc_mcontext.gp_regs[PT_ORIG_R3] = random(); + ucp->uc_mcontext.gp_regs[PT_XER] = random(); + ucp->uc_mcontext.gp_regs[PT_RESULT] = random(); + ucp->uc_mcontext.gp_regs[PT_SOFTE] = random(); + ucp->uc_mcontext.gp_regs[PT_DSCR] = random(); + ucp->uc_mcontext.gp_regs[PT_CTR] = random(); + ucp->uc_mcontext.gp_regs[PT_LNK] = random(); + ucp->uc_mcontext.gp_regs[PT_CCR] = random(); + ucp->uc_mcontext.gp_regs[PT_REGS_COUNT] = random(); + + ucp->uc_link->uc_mcontext.gp_regs[PT_TRAP] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_DSISR] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_DAR] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_ORIG_R3] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_XER] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_RESULT] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_SOFTE] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_DSCR] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_CTR] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_LNK] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_CCR] = random(); + ucp->uc_link->uc_mcontext.gp_regs[PT_REGS_COUNT] = random(); + + if (args & ARG_MESS_WITH_TM_BEFORE) { + if (one_in_chance(2)) + mess_with_tm(); + } +} + +static void seg_signal_handler(int signo, siginfo_t *si, void *uc) +{ + /* Clear exit for process that segfaults */ + exit(0); +} + +static void *sigfuz_test(void *thrid) +{ + struct sigaction trap_sa, seg_sa; + int ret, i = 0; + pid_t t; + + tmp_uc = malloc(sizeof(ucontext_t)); + + /* Main signal handler */ + trap_sa.sa_flags = SA_SIGINFO; + trap_sa.sa_sigaction = trap_signal_handler; + + /* SIGSEGV signal handler */ + seg_sa.sa_flags = SA_SIGINFO; + seg_sa.sa_sigaction = seg_signal_handler; + + /* The signal handler will enable MSR_TS */ + sigaction(SIGUSR1, &trap_sa, NULL); + + /* If it does not crash, it will segfault, avoid it to retest */ + sigaction(SIGSEGV, &seg_sa, NULL); + + while (i < count_max) { + t = fork(); + + if (t == 0) { + /* Once seed per process */ + srand(time(NULL) + getpid()); + if (args & ARG_MESS_WITH_TM_AT) { + if (one_in_chance(2)) + mess_with_tm(); + } + raise(SIGUSR1); + exit(0); + } else { + waitpid(t, &ret, 0); + } + if (!(args & ARG_FOREVER)) + i++; + } + + /* If not freed already, free now */ + if (tmp_uc) { + free(tmp_uc); + tmp_uc = NULL; + } + + return NULL; +} + +static int signal_fuzzer(void) +{ + int t, rc; + pthread_t *threads; + + threads = malloc(nthread * sizeof(pthread_t)); + + for (t = 0; t < nthread; t++) { + rc = pthread_create(&threads[t], NULL, sigfuz_test, + (void *)&t); + if (rc) + perror("Thread creation error\n"); + } + + for (t = 0; t < nthread; t++) { + rc = pthread_join(threads[t], NULL); + if (rc) + perror("Thread join error\n"); + } + + free(threads); + + return EXIT_SUCCESS; +} + +static void show_help(char *name) +{ + printf("%s: Sigfuzzer for powerpc\n", name); + printf("Usage:\n"); + printf("\t-b\t Mess with TM before raising a SIGUSR1 signal\n"); + printf("\t-a\t Mess with TM after raising a SIGUSR1 signal\n"); + printf("\t-m\t Mess with MSR[TS] bits at mcontext\n"); + printf("\t-x\t Mess with everything above\n"); + printf("\t-f\t Run forever (Press ^C to Quit)\n"); + printf("\t-i\t Amount of interactions. (Default = %d)\n", COUNT_MAX); + printf("\t-t\t Amount of threads. (Default = %d)\n", THREADS); + exit(-1); +} + +int main(int argc, char **argv) +{ + int opt; + + while ((opt = getopt(argc, argv, "bamxt:fi:h")) != -1) { + if (opt == 'b') { + printf("Mess with TM before signal\n"); + args |= ARG_MESS_WITH_TM_BEFORE; + } else if (opt == 'a') { + printf("Mess with TM at signal handler\n"); + args |= ARG_MESS_WITH_TM_AT; + } else if (opt == 'm') { + printf("Mess with MSR[TS] bits in mcontext\n"); + args |= ARG_MESS_WITH_MSR_AT; + } else if (opt == 'x') { + printf("Running with all options enabled\n"); + args |= ARG_COMPLETE; + } else if (opt == 't') { + nthread = atoi(optarg); + printf("Threads = %d\n", nthread); + } else if (opt == 'f') { + args |= ARG_FOREVER; + printf("Press ^C to stop\n"); + test_harness_set_timeout(-1); + } else if (opt == 'i') { + count_max = atoi(optarg); + printf("Running for %d interactions\n", count_max); + } else if (opt == 'h') { + show_help(argv[0]); + } + } + + /* Default test suite */ + if (!args) + args = ARG_COMPLETE; + + test_harness(signal_fuzzer, "signal_fuzzer"); +} diff --git a/tools/testing/selftests/powerpc/signal/signal.S b/tools/testing/selftests/powerpc/signal/signal.S new file mode 100644 index 000000000..228fba499 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/signal.S @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright 2015, Cyril Bur, IBM Corp. + */ + +#include "basic_asm.h" + +/* long signal_self(pid_t pid, int sig); */ +FUNC_START(signal_self) + li r0,37 /* sys_kill */ + /* r3 already has our pid in it */ + /* r4 already has signal type in it */ + sc + bc 4,3,1f + subfze r3,r3 +1: blr +FUNC_END(signal_self) + +/* long tm_signal_self(pid_t pid, int sig, int *ret); */ +FUNC_START(tm_signal_self) + PUSH_BASIC_STACK(8) + std r5,STACK_FRAME_PARAM(0)(sp) /* ret */ + tbegin. + beq 1f + tsuspend. + li r0,37 /* sys_kill */ + /* r3 already has our pid in it */ + /* r4 already has signal type in it */ + sc + ld r5,STACK_FRAME_PARAM(0)(sp) /* ret */ + bc 4,3,2f + subfze r3,r3 +2: std r3,0(r5) + tabort. 0 + tresume. /* Be nice to some cleanup, jumps back to tbegin then to 1: */ + /* + * Transaction should be proper doomed and we should never get + * here + */ + li r3,1 + POP_BASIC_STACK(8) + blr +1: li r3,0 + POP_BASIC_STACK(8) + blr +FUNC_END(tm_signal_self) diff --git a/tools/testing/selftests/powerpc/signal/signal.c b/tools/testing/selftests/powerpc/signal/signal.c new file mode 100644 index 000000000..766e484d9 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/signal.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2016, Cyril Bur, IBM Corp. + * + * Sending one self a signal should always get delivered. + */ + +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> + +#include <altivec.h> + +#include "utils.h" + +#define MAX_ATTEMPT 500000 +#define TIMEOUT 5 + +extern long signal_self(pid_t pid, int sig); + +static sig_atomic_t signaled; +static sig_atomic_t fail; + +static void signal_handler(int sig) +{ + if (sig == SIGUSR1) + signaled = 1; + else + fail = 1; +} + +static int test_signal() +{ + int i; + struct sigaction act; + pid_t ppid = getpid(); + pid_t pid; + + act.sa_handler = signal_handler; + act.sa_flags = 0; + sigemptyset(&act.sa_mask); + if (sigaction(SIGUSR1, &act, NULL) < 0) { + perror("sigaction SIGUSR1"); + exit(1); + } + if (sigaction(SIGALRM, &act, NULL) < 0) { + perror("sigaction SIGALRM"); + exit(1); + } + + /* Don't do this for MAX_ATTEMPT, its simply too long */ + for(i = 0; i < 1000; i++) { + pid = fork(); + if (pid == -1) { + perror("fork"); + exit(1); + } + if (pid == 0) { + signal_self(ppid, SIGUSR1); + exit(1); + } else { + alarm(0); /* Disable any pending */ + alarm(2); + while (!signaled && !fail) + asm volatile("": : :"memory"); + if (!signaled) { + fprintf(stderr, "Didn't get signal from child\n"); + FAIL_IF(1); /* For the line number */ + } + /* Otherwise we'll loop too fast and fork() will eventually fail */ + waitpid(pid, NULL, 0); + } + } + + for (i = 0; i < MAX_ATTEMPT; i++) { + long rc; + + alarm(0); /* Disable any pending */ + signaled = 0; + alarm(TIMEOUT); + rc = signal_self(ppid, SIGUSR1); + if (rc) { + fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx", + i, fail, rc); + FAIL_IF(1); /* For the line number */ + } + while (!signaled && !fail) + asm volatile("": : :"memory"); + if (!signaled) { + fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx", + i, fail, rc); + FAIL_IF(1); /* For the line number */ + } + } + + return 0; +} + +int main(void) +{ + test_harness_set_timeout(300); + return test_harness(test_signal, "signal"); +} diff --git a/tools/testing/selftests/powerpc/signal/signal_tm.c b/tools/testing/selftests/powerpc/signal/signal_tm.c new file mode 100644 index 000000000..c9cf66a3d --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/signal_tm.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2016, Cyril Bur, IBM Corp. + * + * Sending one self a signal should always get delivered. + */ + +#include <errno.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <signal.h> +#include <unistd.h> + +#include <altivec.h> + +#include "utils.h" +#include "../tm/tm.h" + +#define MAX_ATTEMPT 500000 +#define TIMEOUT 10 + +extern long tm_signal_self(pid_t pid, int sig, long *ret); + +static sig_atomic_t signaled; +static sig_atomic_t fail; + +static void signal_handler(int sig) +{ + if (tcheck_active()) { + fail = 2; + return; + } + + if (sig == SIGUSR1) + signaled = 1; + else + fail = 1; +} + +static int test_signal_tm() +{ + int i; + struct sigaction act; + + act.sa_handler = signal_handler; + act.sa_flags = 0; + sigemptyset(&act.sa_mask); + if (sigaction(SIGUSR1, &act, NULL) < 0) { + perror("sigaction SIGUSR1"); + exit(1); + } + if (sigaction(SIGALRM, &act, NULL) < 0) { + perror("sigaction SIGALRM"); + exit(1); + } + + SKIP_IF(!have_htm()); + SKIP_IF(htm_is_synthetic()); + + for (i = 0; i < MAX_ATTEMPT; i++) { + /* + * If anything bad happens in ASM and we fail to set ret + * because *handwave* TM this will cause failure + */ + long ret = 0xdead; + long rc = 0xbeef; + + alarm(0); /* Disable any pending */ + signaled = 0; + alarm(TIMEOUT); + FAIL_IF(tcheck_transactional()); + rc = tm_signal_self(getpid(), SIGUSR1, &ret); + if (ret == 0xdead) + /* + * This basically means the transaction aborted before we + * even got to the suspend... this is crazy but it + * happens. + * Yes this also means we might never make forward + * progress... the alarm() will trip eventually... + */ + continue; + + if (rc || ret) { + /* Ret is actually an errno */ + printf("TEXASR 0x%016lx, TFIAR 0x%016lx\n", + __builtin_get_texasr(), __builtin_get_tfiar()); + fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n", + i, fail, rc, ret); + FAIL_IF(ret); + } + while(!signaled && !fail) + asm volatile("": : :"memory"); + if (!signaled) { + fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n", + i, fail, rc, ret); + FAIL_IF(fail); /* For the line number */ + } + } + + return 0; +} + +int main(void) +{ + return test_harness(test_signal_tm, "signal_tm"); +} diff --git a/tools/testing/selftests/powerpc/signal/sigreturn_kernel.c b/tools/testing/selftests/powerpc/signal/sigreturn_kernel.c new file mode 100644 index 000000000..0a1b6e591 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/sigreturn_kernel.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test that we can't sigreturn to kernel addresses, or to kernel mode. + */ + +#define _GNU_SOURCE + +#include <stdio.h> +#include <signal.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "utils.h" + +#define MSR_PR (1ul << 14) + +static volatile unsigned long long sigreturn_addr; +static volatile unsigned long long sigreturn_msr_mask; + +static void sigusr1_handler(int signo, siginfo_t *si, void *uc_ptr) +{ + ucontext_t *uc = (ucontext_t *)uc_ptr; + + if (sigreturn_addr) + UCONTEXT_NIA(uc) = sigreturn_addr; + + if (sigreturn_msr_mask) + UCONTEXT_MSR(uc) &= sigreturn_msr_mask; +} + +static pid_t fork_child(void) +{ + pid_t pid; + + pid = fork(); + if (pid == 0) { + raise(SIGUSR1); + exit(0); + } + + return pid; +} + +static int expect_segv(pid_t pid) +{ + int child_ret; + + waitpid(pid, &child_ret, 0); + FAIL_IF(WIFEXITED(child_ret)); + FAIL_IF(!WIFSIGNALED(child_ret)); + FAIL_IF(WTERMSIG(child_ret) != 11); + + return 0; +} + +int test_sigreturn_kernel(void) +{ + struct sigaction act; + int child_ret, i; + pid_t pid; + + act.sa_sigaction = sigusr1_handler; + act.sa_flags = SA_SIGINFO; + sigemptyset(&act.sa_mask); + + FAIL_IF(sigaction(SIGUSR1, &act, NULL)); + + for (i = 0; i < 2; i++) { + // Return to kernel + sigreturn_addr = 0xcull << 60; + pid = fork_child(); + expect_segv(pid); + + // Return to kernel virtual + sigreturn_addr = 0xc008ull << 48; + pid = fork_child(); + expect_segv(pid); + + // Return out of range + sigreturn_addr = 0xc010ull << 48; + pid = fork_child(); + expect_segv(pid); + + // Return to no-man's land, just below PAGE_OFFSET + sigreturn_addr = (0xcull << 60) - (64 * 1024); + pid = fork_child(); + expect_segv(pid); + + // Return to no-man's land, above TASK_SIZE_4PB + sigreturn_addr = 0x1ull << 52; + pid = fork_child(); + expect_segv(pid); + + // Return to 0xd space + sigreturn_addr = 0xdull << 60; + pid = fork_child(); + expect_segv(pid); + + // Return to 0xe space + sigreturn_addr = 0xeull << 60; + pid = fork_child(); + expect_segv(pid); + + // Return to 0xf space + sigreturn_addr = 0xfull << 60; + pid = fork_child(); + expect_segv(pid); + + // Attempt to set PR=0 for 2nd loop (should be blocked by kernel) + sigreturn_msr_mask = ~MSR_PR; + } + + printf("All children killed as expected\n"); + + // Don't change address, just MSR, should return to user as normal + sigreturn_addr = 0; + sigreturn_msr_mask = ~MSR_PR; + pid = fork_child(); + waitpid(pid, &child_ret, 0); + FAIL_IF(!WIFEXITED(child_ret)); + FAIL_IF(WIFSIGNALED(child_ret)); + FAIL_IF(WEXITSTATUS(child_ret) != 0); + + return 0; +} + +int main(void) +{ + return test_harness(test_sigreturn_kernel, "sigreturn_kernel"); +} diff --git a/tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c b/tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c new file mode 100644 index 000000000..6e58ee4f0 --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c @@ -0,0 +1,43 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test sigreturn to an unaligned address, ie. low 2 bits set. + * Nothing bad should happen. + * This was able to trigger warnings with CONFIG_PPC_RFI_SRR_DEBUG=y. + */ + +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ucontext.h> +#include <unistd.h> + +#include "utils.h" + + +static void sigusr1_handler(int signo, siginfo_t *info, void *ptr) +{ + ucontext_t *uc = ptr; + + UCONTEXT_NIA(uc) |= 3; +} + +static int test_sigreturn_unaligned(void) +{ + struct sigaction action; + + memset(&action, 0, sizeof(action)); + action.sa_sigaction = sigusr1_handler; + action.sa_flags = SA_SIGINFO; + + FAIL_IF(sigaction(SIGUSR1, &action, NULL) == -1); + + raise(SIGUSR1); + + return 0; +} + +int main(void) +{ + return test_harness(test_sigreturn_unaligned, "sigreturn_unaligned"); +} diff --git a/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c b/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c new file mode 100644 index 000000000..e282fff0f --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test that we can take signals with and without the VDSO mapped, which trigger + * different paths in the signal handling code. + * + * See handle_rt_signal64() and setup_trampoline() in signal_64.c + */ + +#define _GNU_SOURCE + +#include <errno.h> +#include <stdio.h> +#include <signal.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mman.h> +#include <sys/types.h> +#include <unistd.h> + +// Ensure assert() is not compiled out +#undef NDEBUG +#include <assert.h> + +#include "utils.h" + +static int search_proc_maps(char *needle, unsigned long *low, unsigned long *high) +{ + unsigned long start, end; + static char buf[4096]; + char name[128]; + FILE *f; + int rc = -1; + + f = fopen("/proc/self/maps", "r"); + if (!f) { + perror("fopen"); + return -1; + } + + while (fgets(buf, sizeof(buf), f)) { + rc = sscanf(buf, "%lx-%lx %*c%*c%*c%*c %*x %*d:%*d %*d %127s\n", + &start, &end, name); + if (rc == 2) + continue; + + if (rc != 3) { + printf("sscanf errored\n"); + rc = -1; + break; + } + + if (strstr(name, needle)) { + *low = start; + *high = end - 1; + rc = 0; + break; + } + } + + fclose(f); + + return rc; +} + +static volatile sig_atomic_t took_signal = 0; + +static void sigusr1_handler(int sig) +{ + took_signal++; +} + +int test_sigreturn_vdso(void) +{ + unsigned long low, high, size; + struct sigaction act; + char *p; + + act.sa_handler = sigusr1_handler; + act.sa_flags = 0; + sigemptyset(&act.sa_mask); + + assert(sigaction(SIGUSR1, &act, NULL) == 0); + + // Confirm the VDSO is mapped, and work out where it is + assert(search_proc_maps("[vdso]", &low, &high) == 0); + size = high - low + 1; + printf("VDSO is at 0x%lx-0x%lx (%lu bytes)\n", low, high, size); + + kill(getpid(), SIGUSR1); + assert(took_signal == 1); + printf("Signal delivered OK with VDSO mapped\n"); + + // Remap the VDSO somewhere else + p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); + assert(p != MAP_FAILED); + assert(mremap((void *)low, size, size, MREMAP_MAYMOVE|MREMAP_FIXED, p) != MAP_FAILED); + assert(search_proc_maps("[vdso]", &low, &high) == 0); + size = high - low + 1; + printf("VDSO moved to 0x%lx-0x%lx (%lu bytes)\n", low, high, size); + + kill(getpid(), SIGUSR1); + assert(took_signal == 2); + printf("Signal delivered OK with VDSO moved\n"); + + assert(munmap((void *)low, size) == 0); + printf("Unmapped VDSO\n"); + + // Confirm the VDSO is not mapped anymore + assert(search_proc_maps("[vdso]", &low, &high) != 0); + + // Make the stack executable + assert(search_proc_maps("[stack]", &low, &high) == 0); + size = high - low + 1; + mprotect((void *)low, size, PROT_READ|PROT_WRITE|PROT_EXEC); + printf("Remapped the stack executable\n"); + + kill(getpid(), SIGUSR1); + assert(took_signal == 3); + printf("Signal delivered OK with VDSO unmapped\n"); + + return 0; +} + +int main(void) +{ + return test_harness(test_sigreturn_vdso, "sigreturn_vdso"); +} |