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repro.c
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repro.c
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// autogenerated by syzkaller (https://github.com/google/syzkaller)
#define _GNU_SOURCE
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#ifndef __NR_bpf
#define __NR_bpf 321
#endif
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;
}
#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \
*(type*)(addr) = \
htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \
(((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))
static bool write_file(const char* file, const char* what, ...)
{
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
int err = errno;
close(fd);
errno = err;
return false;
}
close(fd);
return true;
}
static void kill_and_wait(int pid, int* status)
{
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
for (int i = 0; i < 100; i++) {
if (waitpid(-1, status, WNOHANG | __WALL) == pid)
return;
usleep(1000);
}
DIR* dir = opendir("/sys/fs/fuse/connections");
if (dir) {
for (;;) {
struct dirent* ent = readdir(dir);
if (!ent)
break;
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
continue;
char abort[300];
snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
ent->d_name);
int fd = open(abort, O_WRONLY);
if (fd == -1) {
continue;
}
if (write(fd, abort, 1) < 0) {
}
close(fd);
}
closedir(dir);
} else {
}
while (waitpid(-1, status, __WALL) != pid) {
}
}
static void setup_test()
{
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
write_file("/proc/self/oom_score_adj", "1000");
}
static void execute_one(void);
#define WAIT_FLAGS __WALL
static void loop(void)
{
int iter = 0;
for (;; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
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 < 5000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}
uint64_t r[1] = {0xffffffffffffffff};
void execute_one(void)
{
intptr_t res = 0;
*(uint32_t*)0x20001580 = 0x11;
*(uint32_t*)0x20001584 = 3;
*(uint64_t*)0x20001588 = 0x20000080;
*(uint8_t*)0x20000080 = 0x18;
STORE_BY_BITMASK(uint8_t, , 0x20000081, 0, 0, 4);
STORE_BY_BITMASK(uint8_t, , 0x20000081, 0, 4, 4);
*(uint16_t*)0x20000082 = 0;
*(uint32_t*)0x20000084 = 0;
*(uint8_t*)0x20000088 = 0;
*(uint8_t*)0x20000089 = 0;
*(uint16_t*)0x2000008a = 0;
*(uint32_t*)0x2000008c = 0;
*(uint8_t*)0x20000090 = 0x95;
*(uint8_t*)0x20000091 = 0;
*(uint16_t*)0x20000092 = 0;
*(uint32_t*)0x20000094 = 0;
*(uint64_t*)0x20001590 = 0x20000140;
memcpy((void*)0x20000140, "syzkaller\000", 10);
*(uint32_t*)0x20001598 = 0;
*(uint32_t*)0x2000159c = 0;
*(uint64_t*)0x200015a0 = 0;
*(uint32_t*)0x200015a8 = 0;
*(uint32_t*)0x200015ac = 0;
memset((void*)0x200015b0, 0, 16);
*(uint32_t*)0x200015c0 = 0;
*(uint32_t*)0x200015c4 = 0;
*(uint32_t*)0x200015c8 = -1;
*(uint32_t*)0x200015cc = 8;
*(uint64_t*)0x200015d0 = 0;
*(uint32_t*)0x200015d8 = 0;
*(uint32_t*)0x200015dc = 0x10;
*(uint64_t*)0x200015e0 = 0;
*(uint32_t*)0x200015e8 = 0;
*(uint32_t*)0x200015ec = 0;
*(uint32_t*)0x200015f0 = 0;
*(uint32_t*)0x200015f4 = 0;
*(uint64_t*)0x200015f8 = 0;
*(uint64_t*)0x20001600 = 0;
*(uint32_t*)0x20001608 = 0x10;
*(uint32_t*)0x2000160c = 0;
res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20001580ul, /*size=*/0x80ul);
if (res != -1)
r[0] = res;
*(uint64_t*)0x20000040 = 0x20000000;
memcpy((void*)0x20000000, "sched_switch\000", 13);
*(uint32_t*)0x20000048 = r[0];
syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000040ul, /*size=*/0x10ul);
{
int i;
for (i = 0; i < 64; i++) {
syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000040ul, /*size=*/0x10ul);
}
}
}
int main(void)
{
syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
loop();
return 0;
}