Date: Fri, 27 May 2022 13:06:10 GMT From: Peter Holm <pho@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 4581e8e9a263 - main - stress2: Added a syzkaler reproducer Message-ID: <202205271306.24RD6AWk026549@gitrepo.freebsd.org>
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The branch main has been updated by pho: URL: https://cgit.FreeBSD.org/src/commit/?id=4581e8e9a263d9d17ad5b21f8a453b314b9edfe2 commit 4581e8e9a263d9d17ad5b21f8a453b314b9edfe2 Author: Peter Holm <pho@FreeBSD.org> AuthorDate: 2022-05-27 13:05:33 +0000 Commit: Peter Holm <pho@FreeBSD.org> CommitDate: 2022-05-27 13:05:33 +0000 stress2: Added a syzkaler reproducer --- tools/test/stress2/misc/syzkaller56.sh | 298 +++++++++++++++++++++++++++++++++ 1 file changed, 298 insertions(+) diff --git a/tools/test/stress2/misc/syzkaller56.sh b/tools/test/stress2/misc/syzkaller56.sh new file mode 100755 index 000000000000..f24dafa72823 --- /dev/null +++ b/tools/test/stress2/misc/syzkaller56.sh @@ -0,0 +1,298 @@ +#!/bin/sh + +# panic: Assertion clen >= sizeof(*cm) && clen <= cm->cmsg_len failed at ../../../kern/uipc_usrreq.c:2018 +# cpuid = 8 +# time = 1653654831 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0158aebaa0 +# vpanic() at vpanic+0x17f/frame 0xfffffe0158aebaf0 +# panic() at panic+0x43/frame 0xfffffe0158aebb50 +# unp_externalize() at unp_externalize+0x3b7/frame 0xfffffe0158aebbe0 +# soreceive_generic() at soreceive_generic+0x73d/frame 0xfffffe0158aebca0 +# soreceive() at soreceive+0x4b/frame 0xfffffe0158aebcc0 +# kern_recvit() at kern_recvit+0x1ba/frame 0xfffffe0158aebd70 +# sys_recvfrom() at sys_recvfrom+0x95/frame 0xfffffe0158aebe00 +# amd64_syscall() at amd64_syscall+0x145/frame 0xfffffe0158aebf30 +# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0158aebf30 +# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8230797da, rsp = 0x827bc4f48, rbp = 0x827bc4f70 --- +# KDB: enter: panic +# [ thread pid 32490 tid 141239 ] +# Stopped at 78043(%rip) +# db> x/s version +# FreeBSD 14.0-CURRENT #0 n255820-4682ac697ce9b: Fri May 27 07:06:21 CEST 2022 +# pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO +# db> + + +[ `uname -p` != "amd64" ] && exit 0 + +. ../default.cfg +cat > /tmp/syzkaller56.c <<EOF +// https://syzkaller.appspot.com/bug?id=10ad96d3c8f58f42ad73650e339a4952f9d82254 +// autogenerated by syzkaller (https://github.com/google/syzkaller) +// Reported-by: syzbot+c48c62e7fbd8ef327088@syzkaller.appspotmail.com + +#define _GNU_SOURCE + +#include <errno.h> +#include <pthread.h> +#include <pwd.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 <time.h> +#include <unistd.h> + +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 = 0; + for (; 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 loop(void) +{ + int i, call, thread; + 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); + event_timedwait(&th->done, 50); + break; + } + } + for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) + sleep_ms(1); +} + +uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; + +void execute_call(int call) +{ + intptr_t res = 0; + switch (call) { + case 0: + res = syscall(SYS_socketpair, 1ul, 5ul, 0, 0x20000100ul); + if (res != -1) { + r[0] = *(uint32_t*)0x20000100; + r[1] = *(uint32_t*)0x20000104; + } + break; + case 1: + syscall(SYS_recvfrom, r[0], 0x20000140ul, 0x1000ul, 0ul, 0ul, 0ul); + break; + case 2: + *(uint64_t*)0x20001e40 = 0; + *(uint32_t*)0x20001e48 = 0; + *(uint64_t*)0x20001e50 = 0; + *(uint64_t*)0x20001e58 = 0; + *(uint64_t*)0x20001e60 = 0x20001f80; + memcpy((void*)0x20001f80, + "\x60\x00\x00\x00\xff\xff\x00\x00\x03\x00\x00\x00", 12); + *(uint32_t*)0x20001f8c = -1; + *(uint32_t*)0x20001f90 = 0; + *(uint32_t*)0x20001f94 = 0; + *(uint32_t*)0x20001f98 = 0; + memcpy((void*)0x20001f9c, "\x10\x00\x26\x00", 4); + *(uint32_t*)0x20001fa0 = 0; + *(uint32_t*)0x20001fa4 = 0; + *(uint32_t*)0x20001fa8 = 0; + *(uint32_t*)0x20001fac = 0; + *(uint32_t*)0x20001fb0 = 0; + *(uint32_t*)0x20001fb4 = 0; + *(uint32_t*)0x20001fb8 = -1; + *(uint32_t*)0x20001fbc = 0; + *(uint32_t*)0x20001fc0 = -1; + *(uint32_t*)0x20001fc4 = 0; + *(uint32_t*)0x20001fc8 = 0; + *(uint32_t*)0x20001fcc = 0; + *(uint32_t*)0x20001fd0 = 0; + *(uint32_t*)0x20001fd4 = 0; + *(uint32_t*)0x20001fd8 = 0; + *(uint32_t*)0x20001fdc = 0; + memcpy((void*)0x20001fe0, + "\x60\x00\x00\x00\xff\xff\x00\x00\x03\x00\x00\x00", 12); + *(uint32_t*)0x20001fec = 0; + *(uint32_t*)0x20001ff0 = 0; + *(uint32_t*)0x20001ff4 = 0; + *(uint32_t*)0x20001ff8 = -1; + memcpy((void*)0x20001ffc, "\x10\x00\x00\x00", 4); + *(uint32_t*)0x20002000 = -1; + *(uint32_t*)0x20002004 = 0; + *(uint32_t*)0x20002008 = 0; + *(uint32_t*)0x2000200c = 0; + *(uint32_t*)0x20002010 = 0; + *(uint32_t*)0x20002014 = 0; + *(uint32_t*)0x20002018 = -1; + *(uint32_t*)0x2000201c = 0; + *(uint32_t*)0x20002020 = -1; + *(uint32_t*)0x20002024 = 0; + *(uint32_t*)0x20002028 = 0; + *(uint32_t*)0x2000202c = 0; + *(uint32_t*)0x20002030 = 0; + *(uint32_t*)0x20002034 = 0; + *(uint32_t*)0x20002038 = 0; + *(uint32_t*)0x2000203c = -1; + memcpy((void*)0x20002040, + "\x14\x00\x00\x00\xff\xff\x00\x00\x01\x00\x00\x00", 12); + *(uint32_t*)0x2000204c = -1; + *(uint32_t*)0x20002050 = r[1]; + *(uint64_t*)0x20001e68 = 0xd4; + *(uint32_t*)0x20001e70 = 0; + syscall(SYS_sendmsg, r[1], 0x20001e40ul, 0ul); + break; + } +} +int main(void) +{ + syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); + loop(); + return 0; +} +EOF +mycc -o /tmp/syzkaller56 -Wall -Wextra -O0 /tmp/syzkaller56.c -lpthread || + exit 1 + +start=`date +%s` +while [ $((`date +%s` - start)) -lt 60 ]; do + (cd /tmp; timeout 3m ./syzkaller56) +done + +rm -rf /tmp/syzkaller56 /tmp/syzkaller56.c /tmp/syzkaller56.core \ + /tmp/syzkaller.?????? +exit 0
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