Date: Mon, 2 Mar 2020 06:25:43 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r358519 - user/pho/stress2/misc Message-ID: <202003020625.0226Phis048878@repo.freebsd.org>
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Author: pho Date: Mon Mar 2 06:25:42 2020 New Revision: 358519 URL: https://svnweb.freebsd.org/changeset/base/358519 Log: Added a syzkaller "C reproducer". Added: user/pho/stress2/misc/syzkaller4.sh (contents, props changed) Added: user/pho/stress2/misc/syzkaller4.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller4.sh Mon Mar 2 06:25:42 2020 (r358519) @@ -0,0 +1,384 @@ +#!/bin/sh + +# panic: Assertion mtx_unowned(m) failed at ../../../kern/kern_mutex.c:1179 +# cpuid = 2 +# time = 1581180711 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e57958c0 +# vpanic() at vpanic+0x185/frame 0xfffffe00e5795920 +# panic() at panic+0x43/frame 0xfffffe00e5795980 +# _mtx_destroy() at _mtx_destroy+0x4c/frame 0xfffffe00e57959a0 +# solisten_proto() at solisten_proto+0xdb/frame 0xfffffe00e5795a00 +# tcp6_usr_listen() at tcp6_usr_listen+0x16d/frame 0xfffffe00e5795a60 +# solisten() at solisten+0x42/frame 0xfffffe00e5795a80 +# kern_listen() at kern_listen+0x80/frame 0xfffffe00e5795ac0 +# amd64_syscall() at amd64_syscall+0x2f1/frame 0xfffffe00e5795bf0 +# fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00e5795bf0 + +# $FreeBSD$ + +[ `uname -p` = "i386" ] && exit 0 + +. ../default.cfg +cat > /tmp/syzkaller4.c <<EOF +// https://syzkaller.appspot.com/bug?id=db195d1b0b8ca408a46f301eba33f9457bd2d429 +// autogenerated by syzkaller (https://github.com/google/syzkaller) + +#define _GNU_SOURCE + +#include <sys/types.h> + +#include <errno.h> +#include <pthread.h> +#include <pwd.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/syscall.h> +#include <sys/wait.h> +#include <time.h> +#include <unistd.h> + +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 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 < 19; 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++) { + int pid = fork(); + if (pid < 0) + exit(1); + if (pid == 0) { + 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; + } + } +} + +uint64_t r[6] = {0x0, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, + 0x0, 0xffffffffffffffff}; + +void execute_call(int call) +{ + intptr_t res; + switch (call) { + case 0: + *(uint32_t*)0x20000040 = 0x284002b0; + *(uint32_t*)0x20000044 = 0; + *(uint32_t*)0x20000048 = 0; + *(uint32_t*)0x2000004c = 0; + *(uint32_t*)0x20000050 = 0; + *(uint32_t*)0x20000054 = 0; + *(uint16_t*)0x20000058 = 0; + *(uint16_t*)0x2000005a = 0; + *(uint64_t*)0x20000060 = 0; + *(uint64_t*)0x20000068 = 0; + *(uint64_t*)0x20000070 = 0; + *(uint64_t*)0x20000078 = 0; + *(uint64_t*)0x20000080 = 0; + *(uint64_t*)0x20000088 = 0; + *(uint64_t*)0x20000090 = 0; + syscall(SYS___semctl, 0, 0ul, 0xaul, 0x20000040ul); + break; + case 1: + memcpy( + (void*)0x20000340, + "\x82\x02\xf3\x89\x9c\x53\x3e\x9e\x79\x9b\xd7\xc7\x3c\xcc\x8e\xf9\xba" + "\xb3\x80\xca\x99\xbc\x30\xf1\x8e\x7c\xb0\xc5\x3f\xd6\xa9\xe6\xc6\xa8" + "\xa8\x85\x82\x5b\xdf\x69\xb0\xb9\xed\x55\x59\xd8\x3d\x18\x64\x0d\x49" + "\xdd\x0c\x5b\xba\x14\x0e\xe4\x61\xce\xcf\x6c\x04\x6a\xa1\xda\xa6\x9a" + "\x50\xf8\xa5\xbf\x52\xc2\x63\xf1\x48\xad\xb2\x3e\x5b\x74\xd4\xd3\xe2" + "\x77\x4e\xe8\xef\x92\x6d\x3e\xf6\x35\x76\x60\x9b\x83\xfd\xbc\x00\x45" + "\xd8\x01\x38\x8b\x7b\x9f\x82\x1e\xf2\xe6\x42\xd3\x73\x00\x00\xc4\x05" + "\xc0\xc2\x1a\x82\xc5\x8e\x64\x2d\x07\x86\x09\x4f\xb0\x60\x2a\x5b\xfd" + "\x33\x73\x24\x41\xb5\xaa\x99\xd6\xdf\xbe\x06\xc7\x27\x48\x7e\x13\xfb" + "\x57\xd6\x2f\xcb\x0c\xda\x92\xcc\xc7\x0f\xb4\x6f\x95\xcb\x5d\x0c\x28" + "\x93\x70\xbc\x25\x88\x76\x2f\xd7\x86\x9e\x5e\x03\xfa\x9c\x68\xde\x52" + "\x23\xc5\xae\xa1\x1c\x58\x79\x1a\x6f\xfa\x52\x31\xfc\x2b\xd5\x33\x3d" + "\x49\x60\x80\xa0\x31\x16\x7e\xa5\xd5\x09\x94\x53\x1e\x3b\x56\x3f\x1e" + "\x4d\x95\x76\x44\x9d\x59\x7a\x2d\xbc\xea\xe3\x26\x0d\xf6\x68\xee\xba" + "\xc3\xbb\x9f\xb6\xf1\xa2\x44\xc2\x96\xd5\xdc\xc4\x1c\xa2\xaf\xeb\x92" + "\x4e\xaf\xfc\x1d\x5d\xaf\x30\x9b\x0b\xfd\x19\x1c\x40\xf9\xd0\x0d\xf5" + "\x15\x94\xb7\xe9", + 276); + syscall(SYS_connect, -1, 0x20000340ul, 0x10ul); + break; + case 2: + res = syscall(SYS_semget, 0ul, 0ul, 0x284ul); + if (res != -1) + r[0] = res; + break; + case 3: + res = syscall(SYS_socket, 0x1cul, 1ul, 0ul); + if (res != -1) + r[1] = res; + break; + case 4: + syscall(SYS_listen, r[1], 0); + break; + case 5: + res = syscall(SYS_fstat, r[1], 0x20000080ul); + if (res != -1) + r[2] = *(uint32_t*)0x200000a0; + break; + case 6: + *(uint32_t*)0x20000180 = 0x2840029c; + *(uint32_t*)0x20000184 = 0; + *(uint32_t*)0x20000188 = 0; + *(uint32_t*)0x2000018c = 0; + *(uint32_t*)0x20000190 = r[2]; + *(uint32_t*)0x20000194 = 0; + *(uint16_t*)0x20000198 = 0; + *(uint16_t*)0x2000019a = 0; + *(uint64_t*)0x200001a0 = 0; + *(uint64_t*)0x200001a8 = 0; + *(uint64_t*)0x200001b0 = 0; + *(uint64_t*)0x200001b8 = 0; + *(uint64_t*)0x200001c0 = 0; + *(uint64_t*)0x200001c8 = 0; + *(uint64_t*)0x200001d0 = 0; + syscall(SYS___semctl, r[0], 0ul, 0xaul, 0x20000180ul); + break; + case 7: + res = syscall(SYS_socket, 0x1cul, 1ul, 0x84ul); + if (res != -1) + r[3] = res; + break; + case 8: + syscall(SYS_connect, r[3], 0ul, 0ul); + break; + case 9: + syscall(SYS_fcntl, r[3], 5ul, 0); + break; + case 10: + syscall(SYS_getresuid, 0x20000040ul, 0ul, 0ul); + break; + case 11: + syscall(SYS___semctl, 0, 0ul, 0xaul, 0ul); + break; + case 12: + syscall(SYS___semctl, 0, 0ul, 1ul, 0ul); + break; + case 13: + res = syscall(SYS_semget, 0ul, 0ul, 0x284ul); + if (res != -1) + r[4] = res; + break; + case 14: + syscall(SYS_freebsd11_fstat, -1, 0ul); + break; + case 15: + syscall(SYS___semctl, r[4], 0ul, 1ul, 0ul); + break; + case 16: + res = syscall(SYS_socket, 0x1cul, 1ul, 0ul); + if (res != -1) + r[5] = res; + break; + case 17: + syscall(SYS_listen, r[5], 0); + break; + case 18: + syscall(SYS_fstat, r[5], 0ul); + break; + } +} +int main(void) +{ + syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul); + loop(); + return 0; +} +EOF +mycc -o /tmp/syzkaller4 -Wall -Wextra -O2 /tmp/syzkaller4.c -lpthread || + exit 1 + +(cd /tmp; ./syzkaller4) + +rm /tmp/syzkaller4 /tmp/syzkaller4.c +exit 0
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