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https://github.com/freebsd/freebsd-src
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stress2: Added a syzkaller reproducer
This commit is contained in:
Peter Holm
parent
e039b38d46
commit
f322816aaf
302
tools/test/stress2/misc/syzkaller70.sh
Executable file
302
tools/test/stress2/misc/syzkaller70.sh
Executable file
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@ -0,0 +1,302 @@
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#!/bin/sh
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# db:1:pho1> bt
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# Tracing pid 5640 tid 102468 td 0xfffffe00e4d26ac0
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# kdb_enter() at kdb_enter+0x32/frame 0xfffffe010dbcf260
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# vpanic() at vpanic+0x163/frame 0xfffffe010dbcf390
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# panic() at panic+0x43/frame 0xfffffe010dbcf3f0
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# vm_map_insert1() at vm_map_insert1+0x147/frame 0xfffffe010dbcf4a0
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# vm_map_insert() at vm_map_insert+0x69/frame 0xfffffe010dbcf510
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# vm_map_growstack() at vm_map_growstack+0x90e/frame 0xfffffe010dbcf650
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# vm_map_lookup() at vm_map_lookup+0x15f/frame 0xfffffe010dbcf6e0
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# vm_fault() at vm_fault+0x12f/frame 0xfffffe010dbcf820
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# vm_fault_trap() at vm_fault_trap+0x6f/frame 0xfffffe010dbcf860
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# trap_pfault() at trap_pfault+0x24a/frame 0xfffffe010dbcf8d0
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# calltrap() at calltrap+0x8/frame 0xfffffe010dbcf8d0
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# --- trap 0xc, rip = 0xffffffff81057a06, rsp = 0xfffffe010dbcf9a0, rbp = 0xfffffe010dbcf9a0 ---
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# copyin_nosmap_erms() at copyin_nosmap_erms+0x156/frame 0xfffffe010dbcf9a0
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# uiomove_fromphys() at uiomove_fromphys+0x145/frame 0xfffffe010dbcfa10
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# uiomove_object_page() at uiomove_object_page+0x1dc/frame 0xfffffe010dbcfa70
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# uiomove_object() at uiomove_object+0xa4/frame 0xfffffe010dbcfac0
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# tmpfs_write() at tmpfs_write+0xe4/frame 0xfffffe010dbcfb10
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# VOP_WRITE_APV() at VOP_WRITE_APV+0xcf/frame 0xfffffe010dbcfc20
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# vn_write() at vn_write+0x2f4/frame 0xfffffe010dbcfcb0
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# vn_io_fault() at vn_io_fault+0x1e2/frame 0xfffffe010dbcfd40
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# dofilewrite() at dofilewrite+0x82/frame 0xfffffe010dbcfd90
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# kern_pwritev() at kern_pwritev+0x64/frame 0xfffffe010dbcfdd0
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# sys_pwritev() at sys_pwritev+0x3a/frame 0xfffffe010dbcfe00
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# amd64_syscall() at amd64_syscall+0x14f/frame 0xfffffe010dbcff30
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# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe010dbcff30
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# --- syscall (0, FreeBSD ELF64, syscall), rip = 0x822d56fca, rsp = 0x824255f58, rbp = 0x824255f90 ---
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# FreeBSD 14.0-ALPHA1 #1 main-n264742-81b41b2ef5bfd5-dirty: Tue Aug 15 19:52:50 CEST 2023
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uname -p | grep -Eq "amd64" || exit 0
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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. ../default.cfg
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prog=$(basename "$0" .sh)
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cat > /tmp/$prog.c <<EOF
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// https://syzkaller.appspot.com/bug?id=4c33ed3d5a9072d2ccaec3b2ef7a129f0997f477
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// autogenerated by syzkaller (https://github.com/google/syzkaller)
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// Reported-by: syzbot+c325d6a75e4fd0a68714@syzkaller.appspotmail.com
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <errno.h>
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#include <pthread.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/endian.h>
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#include <sys/syscall.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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static void kill_and_wait(int pid, int* status)
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{
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kill(pid, SIGKILL);
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while (waitpid(-1, status, 0) != pid) {
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}
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}
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static void sleep_ms(uint64_t ms)
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{
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usleep(ms * 1000);
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}
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static uint64_t current_time_ms(void)
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{
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts))
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exit(1);
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return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
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}
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static void thread_start(void* (*fn)(void*), void* arg)
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{
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pthread_t th;
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_attr_setstacksize(&attr, 128 << 10);
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int i = 0;
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for (; i < 100; i++) {
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if (pthread_create(&th, &attr, fn, arg) == 0) {
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pthread_attr_destroy(&attr);
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return;
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}
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if (errno == EAGAIN) {
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usleep(50);
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continue;
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}
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break;
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}
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exit(1);
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}
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typedef struct {
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pthread_mutex_t mu;
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pthread_cond_t cv;
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int state;
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} event_t;
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static void event_init(event_t* ev)
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{
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if (pthread_mutex_init(&ev->mu, 0))
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exit(1);
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if (pthread_cond_init(&ev->cv, 0))
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exit(1);
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ev->state = 0;
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}
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static void event_reset(event_t* ev)
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{
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ev->state = 0;
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}
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static void event_set(event_t* ev)
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{
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pthread_mutex_lock(&ev->mu);
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if (ev->state)
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exit(1);
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ev->state = 1;
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pthread_mutex_unlock(&ev->mu);
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pthread_cond_broadcast(&ev->cv);
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}
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static void event_wait(event_t* ev)
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{
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pthread_mutex_lock(&ev->mu);
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while (!ev->state)
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pthread_cond_wait(&ev->cv, &ev->mu);
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pthread_mutex_unlock(&ev->mu);
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}
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static int event_isset(event_t* ev)
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{
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pthread_mutex_lock(&ev->mu);
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int res = ev->state;
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pthread_mutex_unlock(&ev->mu);
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return res;
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}
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static int event_timedwait(event_t* ev, uint64_t timeout)
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{
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uint64_t start = current_time_ms();
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uint64_t now = start;
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pthread_mutex_lock(&ev->mu);
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for (;;) {
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if (ev->state)
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break;
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uint64_t remain = timeout - (now - start);
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struct timespec ts;
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ts.tv_sec = remain / 1000;
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ts.tv_nsec = (remain % 1000) * 1000 * 1000;
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pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
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now = current_time_ms();
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if (now - start > timeout)
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break;
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}
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int res = ev->state;
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pthread_mutex_unlock(&ev->mu);
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return res;
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}
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struct thread_t {
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int created, call;
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event_t ready, done;
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};
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static struct thread_t threads[16];
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static void execute_call(int call);
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static int running;
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static void* thr(void* arg)
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{
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struct thread_t* th = (struct thread_t*)arg;
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for (;;) {
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event_wait(&th->ready);
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event_reset(&th->ready);
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execute_call(th->call);
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__atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
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event_set(&th->done);
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}
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return 0;
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}
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static void execute_one(void)
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{
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int i, call, thread;
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for (call = 0; call < 4; call++) {
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for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
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thread++) {
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struct thread_t* th = &threads[thread];
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if (!th->created) {
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th->created = 1;
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event_init(&th->ready);
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event_init(&th->done);
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event_set(&th->done);
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thread_start(thr, th);
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}
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if (!event_isset(&th->done))
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continue;
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event_reset(&th->done);
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th->call = call;
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__atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
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event_set(&th->ready);
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event_timedwait(&th->done, 50);
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break;
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}
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}
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for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
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sleep_ms(1);
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}
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static void execute_one(void);
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#define WAIT_FLAGS 0
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static void loop(void)
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{
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int iter __unused = 0;
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for (;; iter++) {
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int pid = fork();
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if (pid < 0)
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exit(1);
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if (pid == 0) {
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execute_one();
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exit(0);
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}
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int status = 0;
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uint64_t start = current_time_ms();
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for (;;) {
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if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
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break;
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sleep_ms(1);
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if (current_time_ms() - start < 5000)
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continue;
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kill_and_wait(pid, &status);
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break;
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}
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}
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}
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uint64_t r[1] = {0xffffffffffffffff};
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void execute_call(int call)
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{
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intptr_t res = 0;
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switch (call) {
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case 0:
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memcpy((void*)0x20000240, "./file0\000", 8);
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res = syscall(SYS_open, /*file=*/0x20000240ul,
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/*flags=*/0x40000400000002c2ul, /*mode=*/0ul);
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if (res != -1)
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r[0] = res;
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break;
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case 1:
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*(uint64_t*)0x20000080 = 0x200006c0;
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*(uint64_t*)0x20000088 = 0x100000;
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syscall(SYS_pwritev, /*fd=*/r[0], /*vec=*/0x20000080ul, /*vlen=*/1ul,
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/*off=*/0ul);
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break;
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case 2:
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syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x200000ul, /*prot=*/3ul,
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/*flags=*/0x410ul, /*fd=*/-1, /*offset=*/0ul);
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break;
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case 3:
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syscall(SYS_mmap, /*addr=*/0x2000c000ul, /*len=*/0x4000ul, /*prot=*/0ul,
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/*flags=*/0x2010ul, /*fd=*/-1, /*offset=*/0ul);
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break;
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}
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}
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int main(void)
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{
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syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
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/*flags=*/0x1012ul, /*fd=*/-1, /*offset=*/0ul);
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loop();
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return 0;
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}
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EOF
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mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c -lpthread || exit 1
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mount | grep -q "on $mntpoint " && umount $mntpoint
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mount -o size=10m -t tmpfs dummy $mntpoint
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cd $mntpoint
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for i in `jot 20`; do
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timeout 3m /tmp/$prog &
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done
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wait
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cd -
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umount $mntpoint
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rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core
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exit 0
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