Date: Mon, 22 Jun 2020 06:58:36 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r362485 - user/pho/stress2/misc Message-ID: <202006220658.05M6waol098172@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: pho Date: Mon Jun 22 06:58:36 2020 New Revision: 362485 URL: https://svnweb.freebsd.org/changeset/base/362485 Log: Added a syzkaller reproducer. Added: user/pho/stress2/misc/syzkaller16.sh (contents, props changed) Added: user/pho/stress2/misc/syzkaller16.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller16.sh Mon Jun 22 06:58:36 2020 (r362485) @@ -0,0 +1,418 @@ +#!/bin/sh + +# Fatal trap 9: general protection fault while in kernel mode +# cpuid = 10; apic id = 0a +# instruction pointer = 0x20:0xffffffff80db1fd9 +# stack pointer = 0x0:0xfffffe00e2240660 +# frame pointer = 0x0:0xfffffe00e2240830 +# code segment = base 0x0, limit 0xfffff, type 0x1b +# = DPL 0, pres 1, long 1, def32 0, gran 1 +# processor eflags = interrupt enabled, resume, IOPL = 0 +# current process = 29524 (syzkaller16) +# trap number = 9 +# panic: general protection fault +# cpuid = 10 +# time = 1592652215 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e2240370 +# vpanic() at vpanic+0x182/frame 0xfffffe00e22403c0 +# panic() at panic+0x43/frame 0xfffffe00e2240420 +# trap_fatal() at trap_fatal+0x387/frame 0xfffffe00e2240480 +# trap() at trap+0x80/frame 0xfffffe00e2240590 +# calltrap() at calltrap+0x8/frame 0xfffffe00e2240590 +# --- trap 0x9, rip = 0xffffffff80db1fd9, rsp = 0xfffffe00e2240660, rbp = 0xfffffe00e2240830 --- +# sctp_lower_sosend() at sctp_lower_sosend+0x21b9/frame 0xfffffe00e2240830 +# sctp_sosend() at sctp_sosend+0x346/frame 0xfffffe00e2240950 +# sosend() at sosend+0x66/frame 0xfffffe00e2240980 +# kern_sendit() at kern_sendit+0x246/frame 0xfffffe00e2240a20 +# sendit() at sendit+0x1d8/frame 0xfffffe00e2240a70 +# sys_sendto() at sys_sendto+0x4d/frame 0xfffffe00e2240ac0 +# ia32_syscall() at ia32_syscall+0x150/frame 0xfffffe00e2240bf0 +# int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0xfbffcf8c +# db> x/s version +# version: FreeBSD 13.0-CURRENT #0 r362431: Sat Jun 20 09:52:53 CEST 2020 +# pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO +# db> + +# $FreeBSD$ + +[ `uname -p` != "amd64" ] && exit 0 + +. ../default.cfg +cat > /tmp/syzkaller16.c <<EOF +// https://syzkaller.appspot.com/bug?id=4b11a1abc41d0a67736ef9a7506ab3ec7e378102 +// autogenerated by syzkaller (https://github.com/google/syzkaller) +// Reported-by: syzbot+bc02585076c3cc977f9b@syzkaller.appspotmail.com + +#define _GNU_SOURCE + +#include <sys/types.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/syscall.h> +#include <sys/wait.h> +#include <time.h> +#include <unistd.h> + +static unsigned long long procid; + +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 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 < 6; 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, 0x1c, 1, 0x84); + if (res != -1) + r[0] = res; + break; + case 1: + NONFAILING(*(uint8_t*)0x10000000 = 0x1c); + NONFAILING(*(uint8_t*)0x10000001 = 0x1c); + NONFAILING(*(uint16_t*)0x10000002 = htobe16(0x4e22 + procid * 4)); + NONFAILING(*(uint32_t*)0x10000004 = 0); + NONFAILING(*(uint8_t*)0x10000008 = 0); + NONFAILING(*(uint8_t*)0x10000009 = 0); + NONFAILING(*(uint8_t*)0x1000000a = 0); + NONFAILING(*(uint8_t*)0x1000000b = 0); + NONFAILING(*(uint8_t*)0x1000000c = 0); + NONFAILING(*(uint8_t*)0x1000000d = 0); + NONFAILING(*(uint8_t*)0x1000000e = 0); + NONFAILING(*(uint8_t*)0x1000000f = 0); + NONFAILING(*(uint8_t*)0x10000010 = 0); + NONFAILING(*(uint8_t*)0x10000011 = 0); + NONFAILING(*(uint8_t*)0x10000012 = 0); + NONFAILING(*(uint8_t*)0x10000013 = 0); + NONFAILING(*(uint8_t*)0x10000014 = 0); + NONFAILING(*(uint8_t*)0x10000015 = 0); + NONFAILING(*(uint8_t*)0x10000016 = 0); + NONFAILING(*(uint8_t*)0x10000017 = 0); + NONFAILING(*(uint32_t*)0x10000018 = 0); + syscall(SYS_bind, (intptr_t)r[0], 0x10000000, 0x1c); + break; + case 2: + NONFAILING(*(uint8_t*)0x10000180 = 0x5f); + NONFAILING(*(uint8_t*)0x10000181 = 0x1c); + NONFAILING(*(uint16_t*)0x10000182 = htobe16(0x4e22 + procid * 4)); + NONFAILING(*(uint32_t*)0x10000184 = 0); + NONFAILING(*(uint64_t*)0x10000188 = htobe64(0)); + NONFAILING(*(uint64_t*)0x10000190 = htobe64(1)); + NONFAILING(*(uint32_t*)0x10000198 = 0); + syscall(SYS_connect, (intptr_t)r[0], 0x10000180, 0x1c); + break; + case 3: + NONFAILING(*(uint32_t*)0x100001c0 = 0x401); + syscall(SYS_setsockopt, (intptr_t)r[0], 0x84, 0x1b, 0x100001c0, 4); + break; + case 4: + NONFAILING(memcpy( + (void*)0x10000380, + "\xa3\x1b\xe1\x78\x8e\x58\x9b\x38\x59\xf3\xbb\xdd\x7e\xf7\x51\x23\x97" + "\x31\xb2\x90\x4a\xd0\x4e\xb7\xdc\x37\xc6\x95\xf6\x05\x5c\xa8\x36\x54" + "\x7e\x7b\x6c\xc3\x7d\xae\x2a\xe4\x77\x08\x94\x67\x3c\x89\x65\x93\x24" + "\x1c\x56\x3e\x08\x69\x05\x35\xeb\x3b\x7f\x19\x7d\xda\x44\x54\xb4\x42" + "\x4f\x7f\xf9\xf9\xfe\x4e\xac\xef\xa6\xd4\xb1\x61\x9d\xd9\x0b\x97\x7c" + "\xd9\x82\x16\xc9\x7b\x2e\xb3\x9f\x02\xde\x0f\xae\xe7\x0b\xec\xa3\x66" + "\x3c\x2e\x6c\xc5\x1d\xa2\xb4\x8b\x4b\x39\x49\xcc\x14\x5a\x50\x62\x0f" + "\xd5\x65\xb9\x7c\x5c\xa0\xea\xfc\xa4\xc9\x13\x73\x14\x16\xba\xcc\xae" + "\x89\xe2\x68\x01\x06\x94\x78\xa3\xee\xa8\x45\xf7\xc2\xcb\x48\x93\xe5" + "\x83\x52\x45\x26\xe3\xeb\x73\xa2\xe4\xf1\x11\xcf\x40\x5f\xef\x99\xc2" + "\xa1\xeb\x2c\x96\x70\x56\x88\xc8\xc7\x6b\xa1\x66\xd2\x23\x20\x07\x62" + "\x69\xd2\x1c\x52\xbb\x5e\x86\x43\x7d\x6c\x65\x44\x42\xf6\xd8\x45\xe2" + "\x00\x24\x00\x00\xf0\x1d\x29\xf6\xd3\x74\x83\x25\x40\x56\x50\x17\x7f" + "\xc3\x60\xd7\xed\xb1\xfb\x7a\x74\x38\x2b\x47\x34\x93\x9c\xee\xc9\xb0" + "\xbf\x7d\xc4\x19\xe2\x77\x4c\xa2\x71\x9c\x30", + 249)); + NONFAILING(*(uint8_t*)0x10000140 = 0x10); + NONFAILING(*(uint8_t*)0x10000141 = 2); + NONFAILING(*(uint16_t*)0x10000142 = htobe16(0x4e22 + procid * 4)); + NONFAILING(*(uint32_t*)0x10000144 = htobe32(-1)); + NONFAILING(*(uint8_t*)0x10000148 = 0); + NONFAILING(*(uint8_t*)0x10000149 = 0); + NONFAILING(*(uint8_t*)0x1000014a = 0); + NONFAILING(*(uint8_t*)0x1000014b = 0); + NONFAILING(*(uint8_t*)0x1000014c = 0); + NONFAILING(*(uint8_t*)0x1000014d = 0); + NONFAILING(*(uint8_t*)0x1000014e = 0); + NONFAILING(*(uint8_t*)0x1000014f = 0); + syscall(SYS_sendto, (intptr_t)r[0], 0x10000380, 0xfffffcaa, 0x20000, + 0x10000140, 0x10); + break; + case 5: + NONFAILING(*(uint32_t*)0x10000540 = 0); + NONFAILING(*(uint32_t*)0x10000544 = 0); + NONFAILING(*(uint32_t*)0x10000548 = 0); + NONFAILING(*(uint32_t*)0x1000054c = 0); + NONFAILING(*(uint32_t*)0x10000550 = 0); + NONFAILING(*(uint32_t*)0x10000554 = 0); + NONFAILING(*(uint32_t*)0x10000558 = 0x20008); + syscall(SYS_sendmsg, (intptr_t)r[0], 0x10000540, 0x100); + break; + } +} +int main(void) +{ + syscall(SYS_mmap, 0x10000000, 0x1000000, 7, 0x1012, -1, 0); + install_segv_handler(); + for (procid = 0; procid < 4; procid++) { + if (fork() == 0) { + loop(); + } + } + sleep(1000000); + return 0; +} +EOF +mycc -o /tmp/syzkaller16 -Wall -Wextra -O0 -m32 /tmp/syzkaller16.c -pthread || + exit 1 + +(cd ../testcases/swap; ./swap -t 1m -i 20 -h > /dev/null 2>&1) & +(cd /tmp; ./syzkaller16) & +sleep 60 +pkill -9 syzkaller16 swap +wait + +rm -f /tmp/syzkaller16 /tmp/syzkaller16.c /tmp/syzkaller16.core +exit 0
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202006220658.05M6waol098172>