svn commit: r363901 - user/pho/stress2/misc
Peter Holm
pho at FreeBSD.org
Wed Aug 5 11:10:05 UTC 2020
Author: pho
Date: Wed Aug 5 11:10:05 2020
New Revision: 363901
URL: https://svnweb.freebsd.org/changeset/base/363901
Log:
Added a new syzkaller reproducer.
Obtained from: markj@
Added:
user/pho/stress2/misc/syzkaller21.sh (contents, props changed)
Added: user/pho/stress2/misc/syzkaller21.sh
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ user/pho/stress2/misc/syzkaller21.sh Wed Aug 5 11:10:05 2020 (r363901)
@@ -0,0 +1,405 @@
+#!/bin/sh
+
+# $ pgrep syzkaller21 | xargs ps -lHp
+# UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND
+# 0 3891 1 0 20 0 29828 2852 - T 0 0:00,14 ./syzkaller21
+# 0 3891 1 0 52 0 29828 2852 ufs T 0 0:00,00 ./syzkaller21
+# 0 3891 1 0 52 0 29828 2852 ufs T 0 0:00,00 ./syzkaller21
+# $ pgrep syzkaller21 | xargs procstat -k
+# PID TID COMM TDNAME KSTACK
+# 3891 100250 syzkaller21 - mi_switch thread_suspend_switch thread_single exit1 sys_sys_exit amd64_syscall fast_syscall_common
+# 3891 100777 syzkaller21 - mi_switch sleepq_switch sleeplk lockmgr_xlock_hard ffs_lock VOP_LOCK1_APV _vn_lock vget_finish vfs_hash_get ffs_vgetf softdep_sync_buf ffs_syncvnode ffs_fsync VOP_FSYNC_APV kern_fsync amd64_syscall fast_syscall_common
+# 3891 100778 syzkaller21 - mi_switch sleepq_switch sleeplk lockmgr_slock_hard ffs_lock VOP_LOCK1_APV _vn_lock vget_finish cache_lookup vfs_cache_lookup VOP_LOOKUP_APV lookup namei kern_chdir amd64_syscall fast_syscall_common
+# $ uname -a
+# FreeBSD t2.osted.lan 13.0-CURRENT FreeBSD 13.0-CURRENT #5 r363786M: Tue Aug 4 16:51:52 CEST 2020
+# pho at t2.osted.lan:/usr/src/sys/amd64/compile/PHO amd64
+# $
+
+# $FreeBSD$
+
+[ `uname -p` != "amd64" ] && exit 0
+
+. ../default.cfg
+cat > /tmp/syzkaller21.c <<EOF
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <pthread.h>
+#include <pwd.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/endian.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+static __thread int skip_segv;
+static __thread jmp_buf segv_env;
+
+static void segv_handler(int sig, siginfo_t* info, void* ctx __unused)
+{
+ uintptr_t addr = (uintptr_t)info->si_addr;
+ const uintptr_t prog_start = 1 << 20;
+ const uintptr_t prog_end = 100 << 20;
+ if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
+ (addr < prog_start || addr > prog_end)) {
+ _longjmp(segv_env, 1);
+ }
+ exit(sig);
+}
+
+static void install_segv_handler(void)
+{
+ struct sigaction sa;
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_sigaction = segv_handler;
+ sa.sa_flags = SA_NODEFER | SA_SIGINFO;
+ sigaction(SIGSEGV, &sa, NULL);
+ sigaction(SIGBUS, &sa, NULL);
+}
+
+#define NONFAILING(...) \
+ { \
+ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
+ if (_setjmp(segv_env) == 0) { \
+ __VA_ARGS__; \
+ } \
+ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
+ }
+
+static void kill_and_wait(int pid, int* status)
+{
+ kill(pid, SIGKILL);
+ while (waitpid(-1, status, 0) != pid) {
+ }
+}
+
+static void sleep_ms(uint64_t ms)
+{
+ usleep(ms * 1000);
+}
+
+static uint64_t current_time_ms(void)
+{
+ struct timespec ts;
+ if (clock_gettime(CLOCK_MONOTONIC, &ts))
+ exit(1);
+ return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
+}
+
+static void use_temporary_dir(void)
+{
+ char tmpdir_template[] = "./syzkaller.XXXXXX";
+ char* tmpdir = mkdtemp(tmpdir_template);
+ if (!tmpdir)
+ exit(1);
+ if (chmod(tmpdir, 0777))
+ exit(1);
+ if (chdir(tmpdir))
+ exit(1);
+}
+
+static void remove_dir(const char* dir)
+{
+ DIR* dp;
+ struct dirent* ep;
+ dp = opendir(dir);
+ if (dp == NULL)
+ exit(1);
+ while ((ep = readdir(dp))) {
+ if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
+ continue;
+ char filename[FILENAME_MAX];
+ snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
+ struct stat st;
+ if (lstat(filename, &st))
+ exit(1);
+ if (S_ISDIR(st.st_mode)) {
+ remove_dir(filename);
+ continue;
+ }
+ if (unlink(filename))
+ exit(1);
+ }
+ closedir(dp);
+ if (rmdir(dir))
+ exit(1);
+}
+
+static void thread_start(void* (*fn)(void*), void* arg)
+{
+ pthread_t th;
+ pthread_attr_t attr;
+ pthread_attr_init(&attr);
+ pthread_attr_setstacksize(&attr, 128 << 10);
+ int i;
+ for (i = 0; i < 100; i++) {
+ if (pthread_create(&th, &attr, fn, arg) == 0) {
+ pthread_attr_destroy(&attr);
+ return;
+ }
+ if (errno == EAGAIN) {
+ usleep(50);
+ continue;
+ }
+ break;
+ }
+ exit(1);
+}
+
+typedef struct {
+ pthread_mutex_t mu;
+ pthread_cond_t cv;
+ int state;
+} event_t;
+
+static void event_init(event_t* ev)
+{
+ if (pthread_mutex_init(&ev->mu, 0))
+ exit(1);
+ if (pthread_cond_init(&ev->cv, 0))
+ exit(1);
+ ev->state = 0;
+}
+
+static void event_reset(event_t* ev)
+{
+ ev->state = 0;
+}
+
+static void event_set(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ if (ev->state)
+ exit(1);
+ ev->state = 1;
+ pthread_mutex_unlock(&ev->mu);
+ pthread_cond_broadcast(&ev->cv);
+}
+
+static void event_wait(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ while (!ev->state)
+ pthread_cond_wait(&ev->cv, &ev->mu);
+ pthread_mutex_unlock(&ev->mu);
+}
+
+static int event_isset(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ int res = ev->state;
+ pthread_mutex_unlock(&ev->mu);
+ return res;
+}
+
+static int event_timedwait(event_t* ev, uint64_t timeout)
+{
+ uint64_t start = current_time_ms();
+ uint64_t now = start;
+ pthread_mutex_lock(&ev->mu);
+ for (;;) {
+ if (ev->state)
+ break;
+ uint64_t remain = timeout - (now - start);
+ struct timespec ts;
+ ts.tv_sec = remain / 1000;
+ ts.tv_nsec = (remain % 1000) * 1000 * 1000;
+ pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
+ now = current_time_ms();
+ if (now - start > timeout)
+ break;
+ }
+ int res = ev->state;
+ pthread_mutex_unlock(&ev->mu);
+ return res;
+}
+
+struct thread_t {
+ int created, call;
+ event_t ready, done;
+};
+
+static struct thread_t threads[16];
+static void execute_call(int call);
+static int running;
+
+static void* thr(void* arg)
+{
+ struct thread_t* th = (struct thread_t*)arg;
+ for (;;) {
+ event_wait(&th->ready);
+ event_reset(&th->ready);
+ execute_call(th->call);
+ __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
+ event_set(&th->done);
+ }
+ return 0;
+}
+
+static void execute_one(void)
+{
+ int i, call, thread;
+ int collide = 0;
+again:
+ for (call = 0; call < 9; call++) {
+ for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
+ thread++) {
+ struct thread_t* th = &threads[thread];
+ if (!th->created) {
+ th->created = 1;
+ event_init(&th->ready);
+ event_init(&th->done);
+ event_set(&th->done);
+ thread_start(thr, th);
+ }
+ if (!event_isset(&th->done))
+ continue;
+ event_reset(&th->done);
+ th->call = call;
+ __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
+ event_set(&th->ready);
+ if (collide && (call % 2) == 0)
+ break;
+ event_timedwait(&th->done, 45);
+ break;
+ }
+ }
+ for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
+ sleep_ms(1);
+ if (!collide) {
+ collide = 1;
+ goto again;
+ }
+}
+
+static void execute_one(void);
+
+#define WAIT_FLAGS 0
+
+static void loop(void)
+{
+ int iter;
+ for (iter = 0;; iter++) {
+ char cwdbuf[32];
+ sprintf(cwdbuf, "./%d", iter);
+ if (mkdir(cwdbuf, 0777))
+ exit(1);
+ int pid = fork();
+ if (pid < 0)
+ exit(1);
+ if (pid == 0) {
+ if (chdir(cwdbuf))
+ exit(1);
+ execute_one();
+ exit(0);
+ }
+ int status = 0;
+ uint64_t start = current_time_ms();
+ for (;;) {
+ if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
+ break;
+ sleep_ms(1);
+ if (current_time_ms() - start < 5 * 1000)
+ continue;
+ kill_and_wait(pid, &status);
+ break;
+ }
+ remove_dir(cwdbuf);
+ }
+}
+
+uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
+ 0xffffffffffffffff};
+
+void execute_call(int call)
+{
+ intptr_t res = 0;
+ switch (call) {
+ case 0:
+ NONFAILING(memcpy((void*)0x20000000, ".\000", 2));
+ res = syscall(SYS_open, 0x20000000ul, 0ul, 0ul);
+ if (res != -1)
+ r[0] = res;
+ break;
+ case 1:
+ NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
+ syscall(SYS_mkdirat, r[0], 0x20000040ul, 0ul);
+ break;
+ case 2:
+ NONFAILING(memcpy((void*)0x20000000, ".\000", 2));
+ res = syscall(SYS_open, 0x20000000ul, 0ul, 0ul);
+ if (res != -1)
+ r[1] = res;
+ break;
+ case 3:
+ NONFAILING(memcpy((void*)0x20000040, "./file1\000", 8));
+ syscall(SYS_mkdirat, r[1], 0x20000040ul, 0ul);
+ break;
+ case 4:
+ NONFAILING(memcpy((void*)0x20000000, ".\000", 2));
+ res = syscall(SYS_open, 0x20000000ul, 0ul, 0ul);
+ if (res != -1)
+ r[2] = res;
+ break;
+ case 5:
+ NONFAILING(memcpy((void*)0x20000080, "./file1\000", 8));
+ NONFAILING(memcpy((void*)0x200000c0, "./file0/file0\000", 14));
+ syscall(SYS_renameat, r[1], 0x20000080ul, r[2], 0x200000c0ul);
+ break;
+ case 6:
+ NONFAILING(memcpy((void*)0x20000100, "./file0/file0\000", 14));
+ res = syscall(SYS_open, 0x20000100ul, 0ul, 0ul);
+ if (res != -1)
+ r[3] = res;
+ break;
+ case 7:
+ syscall(SYS_fsync, r[3]);
+ break;
+ case 8:
+ NONFAILING(memcpy((void*)0x20000140, "./file0/file0\000", 14));
+ syscall(SYS_chdir, 0x20000140ul);
+ break;
+ }
+}
+int main(void)
+{
+ syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
+ install_segv_handler();
+ use_temporary_dir();
+ loop();
+ return 0;
+}
+EOF
+mycc -o /tmp/syzkaller21 -Wall -Wextra -O2 /tmp/syzkaller21.c -lpthread ||
+ exit 1
+
+(cd ../testcases/swap; ./swap -t 1m -i 20 -h > /dev/null 2>&1) &
+(cd /tmp; ./syzkaller21) &
+sleep 60
+while pkill swap; do sleep .2; done
+pkill -9 syzkaller21
+sleep .5
+if pgrep -q syzkaller21; then
+ pgrep syzkaller21 | xargs ps -lHp
+ pgrep syzkaller21 | xargs procstat -k
+ exit 1
+fi
+wait
+
+rm -rf /tmp/syzkaller21.*
+rm -f /tmp/syzkaller21
+exit 0
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