143 lines
3.9 KiB
Bash
Executable File
143 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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# Fatal trap 18: integer divide fault while in kernel mode
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# cpuid = 0; apic id = 00
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# instruction pointer = 0x20:0xffffffff80c310ee
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# stack pointer = 0x28:0xfffffe0131a629e0
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# frame pointer = 0x28:0xfffffe0131a62a30
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# code segment = base 0x0, limit 0xfffff, type 0x1b
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# = DPL 0, pres 1, long 1, def32 0, gran 1
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# processor eflags = interrupt enabled, resume, IOPL = 0
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# current process = 12 (swi4: clock (0))
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# trap number = 18
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# panic: integer divide fault
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# cpuid = 0
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# time = 1618722013
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# KDB: stack backtrace:
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# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0131a626f0
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# vpanic() at vpanic+0x181/frame 0xfffffe0131a62740
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# panic() at panic+0x43/frame 0xfffffe0131a627a0
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# trap_fatal() at trap_fatal+0x387/frame 0xfffffe0131a62800
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# trap() at trap+0xa4/frame 0xfffffe0131a62910
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# calltrap() at calltrap+0x8/frame 0xfffffe0131a62910
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# --- trap 0x12, rip = 0xffffffff80c310ee, rsp = 0xfffffe0131a629e0, rbp = 0xfffffe0131a62a30 ---
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# realtimer_expire_l() at realtimer_expire_l+0xee/frame 0xfffffe0131a62a30
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# softclock_call_cc() at softclock_call_cc+0x15d/frame 0xfffffe0131a62b00
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# softclock() at softclock+0x66/frame 0xfffffe0131a62b20
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# ithread_loop() at ithread_loop+0x279/frame 0xfffffe0131a62bb0
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# fork_exit() at fork_exit+0x80/frame 0xfffffe0131a62bf0
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# fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0131a62bf0
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# --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
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# KDB: enter: panic
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# [ thread pid 12 tid 100161 ]
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# Stopped at kdb_enter+0x37: movq $0,0x1283f9e(%rip)
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# db> x/s version
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# version: FreeBSD 14.0-CURRENT #0 main-n246123-21afed4b1d1-dirty: Sat Apr 17 07:39:42 CEST 2021
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# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO
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# db>
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[ `uname -p` != "amd64" ] && exit 0
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../default.cfg
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cat > /tmp/syzkaller33.c <<EOF
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// https://syzkaller.appspot.com/bug?id=38b58493445d524070d1a7cd73612f8cc9d01f39
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// autogenerated by syzkaller (https://github.com/google/syzkaller)
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// Reported-by: syzbot+5ab360bd3d3e3c5a6e0e@syzkaller.appspotmail.com
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/endian.h>
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#include <sys/syscall.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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static void kill_and_wait(int pid, int* status)
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{
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kill(pid, SIGKILL);
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while (waitpid(-1, status, 0) != pid) {
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}
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}
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static void sleep_ms(uint64_t ms)
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{
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usleep(ms * 1000);
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}
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static uint64_t current_time_ms(void)
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{
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts))
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exit(1);
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return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
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}
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static void execute_one(void);
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#define WAIT_FLAGS 0
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static void loop(void)
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{
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int iter = 0;
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for (;; iter++) {
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int pid = fork();
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if (pid < 0)
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exit(1);
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if (pid == 0) {
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execute_one();
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exit(0);
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}
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int status = 0;
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uint64_t start = current_time_ms();
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for (;;) {
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if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
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break;
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sleep_ms(1);
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if (current_time_ms() - start < 5000) {
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continue;
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}
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kill_and_wait(pid, &status);
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break;
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}
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}
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}
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uint64_t r[1] = {0x0};
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void execute_one(void)
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{
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intptr_t res = 0;
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res = syscall(SYS_ktimer_create, 0ul, 0ul, 0x200011c0ul);
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if (res != -1)
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r[0] = *(uint32_t*)0x200011c0;
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*(uint64_t*)0x20001200 = 0x800000000000000;
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*(uint64_t*)0x20001208 = 0;
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*(uint64_t*)0x20001210 = 0;
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*(uint64_t*)0x20001218 = 0xa2b;
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syscall(SYS_ktimer_settime, r[0], 1ul, 0x20001200ul, 0ul);
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}
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int main(void)
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{
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syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
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loop();
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return 0;
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}
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EOF
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mycc -o /tmp/syzkaller33 -Wall -Wextra -O0 /tmp/syzkaller33.c ||
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exit 1
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(cd /tmp; timeout 3m ./syzkaller33)
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rm -rf /tmp/syzkaller33 syzkaller33.c /tmp/syzkaller.*
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exit 0
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