Date: Tue, 9 Jun 2020 06:48:26 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r361961 - user/pho/stress2/misc Message-ID: <202006090648.0596mQbA036806@repo.freebsd.org>
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Author: pho Date: Tue Jun 9 06:48:25 2020 New Revision: 361961 URL: https://svnweb.freebsd.org/changeset/base/361961 Log: Added a syzkaller reproducer. Added: user/pho/stress2/misc/syzkaller14.sh (contents, props changed) Added: user/pho/stress2/misc/syzkaller14.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller14.sh Tue Jun 9 06:48:25 2020 (r361961) @@ -0,0 +1,297 @@ +#!/bin/sh + +# panic: mtx_lock() of spin mutex (null) @ ../../../kern/uipc_ktls.c:1034 +# cpuid = 5 +# time = 1591684934 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe013a91b6c0 +# vpanic() at vpanic+0x182/frame 0xfffffe013a91b710 +# panic() at panic+0x43/frame 0xfffffe013a91b770 +# __mtx_lock_flags() at __mtx_lock_flags+0x13c/frame 0xfffffe013a91b7c0 +# ktls_get_rx_mode() at ktls_get_rx_mode+0x4e/frame 0xfffffe013a91b7f0 +# tcp_default_ctloutput() at tcp_default_ctloutput+0x800/frame 0xfffffe013a91b960 +# tcp_ctloutput() at tcp_ctloutput+0x1f5/frame 0xfffffe013a91b9d0 +# sogetopt() at sogetopt+0x101/frame 0xfffffe013a91ba40 +# kern_getsockopt() at kern_getsockopt+0xb4/frame 0xfffffe013a91baa0 +# sys_getsockopt() at sys_getsockopt+0x52/frame 0xfffffe013a91bad0 +# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe013a91bbf0 +# fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe013a91bbf0 +# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x80045446a, rsp = 0x7fffdffdcf88, rbp = 0x7fffdffdcfc0 --- +# KDB: enter: panic +# [ thread pid 5313 tid 101679 ] +# Stopped at kdb_enter+0x37: movq $0,0x10c7fa6(%rip) +# db> x/s version +# version: FreeBSD 13.0-CURRENT #0 r361886: Tue Jun 9 08:32:24 CEST 2020\012 pho@t2.osted.lan:/usr/src/sys/amd64/compile/KTLS\012 +# db> + +# $FreeBSD$ + +# Reproduced on r361886 with "options KERN_TLS" + +[ `uname -p` = "i386" ] && exit 0 + +. ../default.cfg +cat > /tmp/syzkaller14.c <<EOF +// https://syzkaller.appspot.com/bug?id=d50164ce557a20a785510aac5d6f104d8a62e779 +// autogenerated by syzkaller (https://github.com/google/syzkaller) +// Reported-by: syzbot+a8829e888a93a4a04619@syzkaller.appspotmail.com + +#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 unsigned long long procid; + +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 < 3; 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[1] = {0xffffffffffffffff}; + +void execute_call(int call) +{ + intptr_t res = 0; + switch (call) { + case 0: + res = syscall(SYS_socket, 0x1cul, 1ul, 0); + if (res != -1) + r[0] = res; + break; + case 1: + syscall(SYS_getsockopt, r[0], 6, 0x2a, 0ul, 0ul); + break; + case 2: + syscall(SYS_listen, r[0], 1); + break; + } +} +int main(void) +{ + syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); + for (procid = 0; procid < 4; procid++) { + if (fork() == 0) { + loop(); + } + } + sleep(1000000); + return 0; +} +EOF +mycc -o /tmp/syzkaller14 -Wall -Wextra -O2 /tmp/syzkaller14.c -lpthread || + exit 1 + +(cd /tmp; ./syzkaller14) & +sleep 60 +pkill -9 syzkaller14 +wait + +rm -f /tmp/syzkaller14 /tmp/syzkaller14.c /tmp/syzkaller14.core +exit 0
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