Date: Sun, 12 Apr 2020 12:25:39 -0400 From: Mark Johnston <markj@freebsd.org> To: Peter Holm <pho@freebsd.org> Cc: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: Re: svn commit: r359820 - user/pho/stress2/misc Message-ID: <20200412162539.GA2519@raichu> In-Reply-To: <202004120559.03C5xKI3099770@repo.freebsd.org> References: <202004120559.03C5xKI3099770@repo.freebsd.org>
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On Sun, Apr 12, 2020 at 05:59:20AM +0000, Peter Holm wrote: > Author: pho > Date: Sun Apr 12 05:59:20 2020 > New Revision: 359820 > URL: https://svnweb.freebsd.org/changeset/base/359820 > > Log: > Added more syzkaller reproducers. > > Added: > user/pho/stress2/misc/syzkaller5.sh (contents, props changed) > user/pho/stress2/misc/syzkaller6.sh (contents, props changed) > user/pho/stress2/misc/syzkaller7.sh (contents, props changed) > [...] > Added: user/pho/stress2/misc/syzkaller7.sh > ============================================================================== > --- /dev/null 00:00:00 1970 (empty, because file is newly added) > +++ user/pho/stress2/misc/syzkaller7.sh Sun Apr 12 05:59:20 2020 (r359820) > @@ -0,0 +1,163 @@ > +#!/bin/sh > + > +# panic: Duplicate free of 0xfffff800049ad800 from zone > +# 0xfffff800041e82c0(mbuf) slab 0xfffff800049adf90(8) > +# > +# KDB: stack backtrace: > +# db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame > +# 0xfffffe0016b2c4a0 > +# vpanic() at vpanic+0x1e0/frame 0xfffffe0016b2c500 > +# panic() at panic+0x43/frame 0xfffffe0016b2c560 > +# uma_dbg_free() at uma_dbg_free+0x246/frame 0xfffffe0016b2c5b0 > +# uma_zfree_arg() at uma_zfree_arg+0x1aa/frame 0xfffffe0016b2c640 > +# uipc_ready() at uipc_ready+0x19f/frame 0xfffffe0016b2c690 > +# sendfile_iodone() at sendfile_iodone+0x342/frame 0xfffffe0016b2c6f0 > +# vnode_pager_generic_getpages_done_async() at > +# vnode_pager_generic_getpages_done_async+0x4a/frame 0xfffffe0016b2c720 > +# bufdone() at bufdone+0xa1/frame 0xfffffe0016b2c7a0 > +# g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c800 > +# g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c860 > +# g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c8c0 > +# g_disk_done() at g_disk_done+0x179/frame 0xfffffe0016b2c910 > +# dadone() at dadone+0x655/frame 0xfffffe0016b2c9a0 > +# xpt_done_process() at xpt_done_process+0x5b2/frame 0xfffffe0016b2ca00 > +# xpt_done_td() at xpt_done_td+0x175/frame 0xfffffe0016b2ca60 > +# fork_exit() at fork_exit+0xb0/frame 0xfffffe0016b2cab0 > +# fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0016b2cab0 > +# --- trap 0, rip = 0, rsp = 0, rbp = 0 --- > + > +# $FreeBSD$ > + > +# Not reproduced on r359769 There is a bug in old reproducers that causes them to fail. Specifically, the call: syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0); should be syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0ul); There is some discussion of the problem here: https://github.com/google/syzkaller/pull/1493 In general, when testing old reproducers, all you need to do is manually adjust SYS_mmap calls as above. > +# Fixed by r359779 > + > +[ `uname -p` = "i386" ] && exit 0 > + > +. ../default.cfg > +cat > /tmp/syzkaller7.c <<EOF > +// https://syzkaller.appspot.com/bug?id=3a27f6d4656356facc22a9329be797ef1143d0ad > +// autogenerated by syzkaller (https://github.com/google/syzkaller) > + > +#define _GNU_SOURCE > + > +#include <sys/types.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 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[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, > + 0xffffffffffffffff, 0xffffffffffffffff}; > + > +void execute_one(void) > +{ > + long res = 0; > + memcpy((void*)0x20001180, "./file0\000", 8); > + res = syscall(SYS_open, 0x20001180, 0x8240, 0); > + if (res != -1) > + r[0] = res; > + res = syscall(SYS_socketpair, 1, 1, 0, 0x20000100); > + if (res != -1) { > + r[1] = *(uint32_t*)0x20000100; > + r[2] = *(uint32_t*)0x20000104; > + } > + memcpy((void*)0x20000480, "./file0\000", 8); > + res = syscall(SYS_open, 0x20000480, 0x80000000000206, 0); > + if (res != -1) > + r[3] = res; > + res = syscall(SYS_dup, r[3]); > + if (res != -1) > + r[4] = res; > + *(uint64_t*)0x20000100 = 0x200002c0; > + memcpy((void*)0x200002c0, "\xdd", 1); > + *(uint64_t*)0x20000108 = 1; > + syscall(SYS_pwritev, r[4], 0x20000100, 1, 0); > + *(uint64_t*)0x20002e80 = 0x20000540; > + memcpy((void*)0x20000540, "\x7f", 1); > + *(uint64_t*)0x20002e88 = 1; > + syscall(SYS_pwritev, r[3], 0x20002e80, 1, 0xbf24); > + memcpy((void*)0x200004c0, > + "\x89\x88\xaa\x4a\xc3\x95\x23\x77\x54\xee\x66\xf3\x8d\xa4\xae\xf3\x47" > + "\x6d\x78\xb7\x1f\xe6\x0d\xb7\x4a\x9f\xb9\xc9\x99\x91\x6c\x98", > + 32); > + syscall(SYS_setsockopt, r[2], 0, 2, 0x200004c0, 0x20); > + syscall(SYS_fcntl, r[4], 4, 0x10044); > + syscall(SYS_read, r[4], 0x20000000, 0x6d999); > + syscall(SYS_sendfile, r[0], r[1], 0, 2); > +} > +int main(void) > +{ > + syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0); > + loop(); > + return 0; > +} > +EOF > +mycc -o /tmp/syzkaller7 -Wall -Wextra -O2 /tmp/syzkaller7.c -lpthread || > + exit 1 > + > +(cd /tmp; ./syzkaller7) & > +sleep 60 > +pkill -9 syzkaller7 > +wait > + > +rm -f /tmp/syzkaller7 /tmp/syzkaller7.c /tmp/syzkaller7.core /tmp/file0 > +exit 0
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