KASAN: use-after-free Read in reiserfs_fill_super

// 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 <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.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>

#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static unsigned long long procid;

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 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;
}

struct fs_image_segment {
	void* data;
	uintptr_t size;
	uintptr_t offset;
};

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (129 << 20)

static unsigned long fs_image_segment_check(unsigned long size, unsigned long nsegs, struct fs_image_segment* segs)
{
	if (nsegs > IMAGE_MAX_SEGMENTS)
		nsegs = IMAGE_MAX_SEGMENTS;
	for (size_t i = 0; i < nsegs; i++) {
		if (segs[i].size > IMAGE_MAX_SIZE)
			segs[i].size = IMAGE_MAX_SIZE;
		segs[i].offset %= IMAGE_MAX_SIZE;
		if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
			segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
		if (size < segs[i].offset + segs[i].offset)
			size = segs[i].offset + segs[i].offset;
	}
	if (size > IMAGE_MAX_SIZE)
		size = IMAGE_MAX_SIZE;
	return size;
}
static int setup_loop_device(long unsigned size, long unsigned nsegs, struct fs_image_segment* segs, const char* loopname, int* memfd_p, int* loopfd_p)
{
	int err = 0, loopfd = -1;
	size = fs_image_segment_check(size, nsegs, segs);
	int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
	if (memfd == -1) {
		err = errno;
		goto error;
	}
	if (ftruncate(memfd, size)) {
		err = errno;
		goto error_close_memfd;
	}
	for (size_t i = 0; i < nsegs; i++) {
		if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
		}
	}
	loopfd = open(loopname, O_RDWR);
	if (loopfd == -1) {
		err = errno;
		goto error_close_memfd;
	}
	if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
		if (errno != EBUSY) {
			err = errno;
			goto error_close_loop;
		}
		ioctl(loopfd, LOOP_CLR_FD, 0);
		usleep(1000);
		if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
			err = errno;
			goto error_close_loop;
		}
	}
	*memfd_p = memfd;
	*loopfd_p = loopfd;
	return 0;

error_close_loop:
	close(loopfd);
error_close_memfd:
	close(memfd);
error:
	errno = err;
	return -1;
}

static long syz_mount_image(volatile long fsarg, volatile long dir, volatile unsigned long size, volatile unsigned long nsegs, volatile long segments, volatile long flags, volatile long optsarg)
{
	struct fs_image_segment* segs = (struct fs_image_segment*)segments;
	int res = -1, err = 0, loopfd = -1, memfd = -1, need_loop_device = !!segs;
	char* mount_opts = (char*)optsarg;
	char* target = (char*)dir;
	char* fs = (char*)fsarg;
	char* source = NULL;
	char loopname[64];
	if (need_loop_device) {
		memset(loopname, 0, sizeof(loopname));
		snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
		if (setup_loop_device(size, nsegs, segs, loopname, &memfd, &loopfd) == -1)
			return -1;
		source = loopname;
	}
	mkdir(target, 0777);
	char opts[256];
	memset(opts, 0, sizeof(opts));
	if (strlen(mount_opts) > (sizeof(opts) - 32)) {
	}
	strncpy(opts, mount_opts, sizeof(opts) - 32);
	if (strcmp(fs, "iso9660") == 0) {
		flags |= MS_RDONLY;
	} else if (strncmp(fs, "ext", 3) == 0) {
		if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
			strcat(opts, ",errors=continue");
	} else if (strcmp(fs, "xfs") == 0) {
		strcat(opts, ",nouuid");
	}
	res = mount(source, target, fs, flags, opts);
	if (res == -1) {
		err = errno;
		goto error_clear_loop;
	}
	res = open(target, O_RDONLY | O_DIRECTORY);
	if (res == -1) {
		err = errno;
	}

error_clear_loop:
	if (need_loop_device) {
		ioctl(loopfd, LOOP_CLR_FD, 0);
		close(loopfd);
		close(memfd);
	}
	errno = err;
	return res;
}

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 reset_loop()
{
	char buf[64];
	snprintf(buf, sizeof(buf), "/dev/loop%llu", procid);
	int loopfd = open(buf, O_RDWR);
	if (loopfd != -1) {
		ioctl(loopfd, LOOP_CLR_FD, 0);
		close(loopfd);
	}
}

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++) {
		reset_loop();
		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;
		}
	}
}

void execute_one(void)
{
memcpy((void*)0x20000040, "reiserfs\000", 9);
memcpy((void*)0x20000100, "./file0\000", 8);
*(uint64_t*)0x20000200 = 0x20010000;
memcpy((void*)0x20010000, "\x00\x40\x00\x00\x68\x02\x00\x00\x97\x3d\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x84\x3d\x00\x00\x00\x01\x00\x00\x61\x1c\xad\x49\xe1\x00\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x10\xec\x03\x02\x00\x01\x00\x52\x65\x49\x73\x45\x72\x33\x46\x73\x00\x00\x00\x02\x00\x00\x00\x02", 69);
*(uint64_t*)0x20000208 = 0x45;
*(uint64_t*)0x20000210 = 0x10000;
*(uint64_t*)0x20000218 = 0x20011100;
memcpy((void*)0x20011100, "\x80\x00\x00\x03\x00\x20\x00\x00\x00\x00\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x84\x3d\x00\x00\x00\x01\x00\x00\x61\x1c\xad\x49\xe1", 33);
*(uint64_t*)0x20000220 = 0x21;
*(uint64_t*)0x20000228 = 0x3d96000;
*(uint64_t*)0x20000230 = 0x20000280;
memcpy((void*)0x20000280, "\x01\x00\x02\x00\x75\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\x00\xe0\x0f\x10\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\xf4\x01\x00\x00\x02\x00\x23\x00\xbd\x0f\xf9\x0b\x71\x85\xf1\x1a\xc8\x09\x10\x8c\x77\x8d\x51\xe3\xe0\x43\xcb\x42\x20\x23\x61\x74\xc7\x8c\x42\xb1\x79\x5b\x37\x3c\xcf\x55\x37\xfa\x6c\x8b\x4c\x1b\xab\xd7\xf1\xcc\xf3\x48\x07\x55\x75\x1b\xc5\x30\xc9\xa7\xfb\x72\x41\xbd\x73\xcc\x02\x82\xae\x33\xdc\x1e\x8d\x35\xe3\xb3\x0f\x5b\xff\xf3\x3e\x0c\x10\xbd\xc3\x34\x11\x6f\xb3\x19\x36\x26\x6d\x74\x93\x69\xef\x5f\x46\x28\x66\x32\xae\xdd\xa8\x68\x21\x79\xd4\xd2\x90\x00\x00\x00\x00\x8d\xbd\x44\xdd\xc4\xa1\xc7\x5a\xb7\x9b\x5b\x94\xd6\x5c\xd1\x95\x88\x55\x40\xd1\xc0\x3d\x68\x40\x23\x2d\xdd\xa8\x3d\xd6\x70\xb6\x37\x78\x74\xd0\xf1\x51\xa2\x1b\x68\x27\x77\x9b\xf7\xb1\x0f\xf8\x60\x7a\x65\x83\x77\xd9\x00\x00\x0c\xcb\xba\xa7\xc5\xe7\x1b\xf2\x1d\x89\xe1\xe2\x46\xec\x1c\x98\x96\x67\x26\x04\x0b\x31\xac\x7f\x54\xc9\x7a\x67\x1b\x53\xf9\x99\x0d\xac\x11\xf0\x79\xbd\xa4\xdb\x57\xc9\x3f\xa1\x01\xd9\xd5\x33\x17\x40\xef\x9b\x9d\x69\xc3\x28\xa0\xea\xdf\x29\xc8\xc6\x3d\xe2\x48\xc7\x95\x93\x28\x15\x0f\x17\xb9\xcf\x72", 308);
*(uint64_t*)0x20000238 = 0x134;
*(uint64_t*)0x20000240 = 0x3d97000;
*(uint8_t*)0x20011400 = 0;
syz_mount_image(0x20000040, 0x20000100, 0, 3, 0x20000200, 0, 0x20011400);

}
int main(void)
{
		syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
	syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
	syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
			loop();
	return 0;
}