Date: Wed, 17 Jun 2020 11:01:41 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r362266 - user/pho/stress2/misc Message-ID: <202006171101.05HB1fsG095654@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: pho Date: Wed Jun 17 11:01:40 2020 New Revision: 362266 URL: https://svnweb.freebsd.org/changeset/base/362266 Log: Added a syzkaller reproducer. Added: user/pho/stress2/misc/syzkaller15.sh (contents, props changed) Added: user/pho/stress2/misc/syzkaller15.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller15.sh Wed Jun 17 11:01:40 2020 (r362266) @@ -0,0 +1,191 @@ +#!/bin/sh + + +# panic: sbflush_internal: ccc 0 mb 0 mbcnt 256 +# cpuid = 4 +# time = 1592126385 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe012b22f8d0 +# vpanic() at vpanic+0x182/frame 0xfffffe012b22f920 +# panic() at panic+0x43/frame 0xfffffe012b22f980 +# sbrelease_internal() at sbrelease_internal+0xbd/frame 0xfffffe012b22f9a0 +# solisten_proto() at solisten_proto+0xab/frame 0xfffffe012b22fa00 +# sctp_listen() at sctp_listen+0x2f4/frame 0xfffffe012b22fa60 +# solisten() at solisten+0x42/frame 0xfffffe012b22fa80 +# kern_listen() at kern_listen+0x7c/frame 0xfffffe012b22fac0 +# ia32_syscall() at ia32_syscall+0x150/frame 0xfffffe012b22fbf0 +# int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0xffffdb10 +# KDB: enter: panic +# [ thread pid 93263 tid 100202 ] +# Stopped at kdb_enter+0x37: movq $0,0x10c5456(%rip) +# db> x/s version +# version: FreeBSD 13.0-CURRENT #0 r362171: Sun Jun 14 09:06:12 CEST 2020\012 pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO\012 +# db> + +# $FreeBSD$ + +[ `uname -p` != "amd64" ] && exit 0 + +. ../default.cfg +cat > /tmp/syzkaller15.c <<EOF +// https://syzkaller.appspot.com/bug?id=6b9cfdc1689b0adee1c6f75f56ab034a70500d93 +// autogenerated by syzkaller (https://github.com/google/syzkaller) +// Reported-by: syzbot+bca42a93f1254ca91e94@syzkaller.appspotmail.com + +#define _GNU_SOURCE + +#include <sys/types.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 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_one(void) +{ + intptr_t res = 0; + res = syscall(SYS_socket, 0x1c, 1, 0x84); + if (res != -1) + r[0] = res; + NONFAILING(*(uint8_t*)0x10000040 = 0xc8); + NONFAILING(*(uint8_t*)0x10000041 = 0x51); + NONFAILING(*(uint8_t*)0x10000042 = 0); + NONFAILING(*(uint8_t*)0x10000043 = 0); + NONFAILING(*(uint8_t*)0x10000044 = 0); + NONFAILING(*(uint8_t*)0x10000045 = 0); + NONFAILING(*(uint8_t*)0x10000046 = 0); + NONFAILING(*(uint8_t*)0x10000047 = 0); + NONFAILING(*(uint8_t*)0x10000048 = 0); + NONFAILING(*(uint8_t*)0x10000049 = 0); + NONFAILING(*(uint8_t*)0x1000004a = 0); + syscall(SYS_setsockopt, (intptr_t)r[0], 0x84, 0xc, 0x10000040, 0xb); + 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); + syscall(SYS_listen, (intptr_t)r[0], 7); +} +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/syzkaller15 -Wall -Wextra -O0 -m32 /tmp/syzkaller15.c || + exit 1 + +(cd /tmp; ./syzkaller15) & +sleep 60 +pkill -9 syzkaller15 +wait + +rm -f /tmp/syzkaller15 /tmp/syzkaller15.c /tmp/syzkaller15.core +exit 0
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202006171101.05HB1fsG095654>