Hi, I reported a bug found by syzkaller fuzzer with custom modifications. reproduce it in 5.12.0-rc3+ and crash log is as fellow:
================================================================== BUG: KASAN: use-after-free in f2fs_test_bit fs/f2fs/f2fs.h:2572 [inline] BUG: KASAN: use-after-free in current_nat_addr fs/f2fs/node.h:213 [inline] BUG: KASAN: use-after-free in get_next_nat_page fs/f2fs/node.c:123 [inline] BUG: KASAN: use-after-free in __flush_nat_entry_set fs/f2fs/node.c:2888 [inline] BUG: KASAN: use-after-free in f2fs_flush_nat_entries+0x258e/0x2960 fs/f2fs/node.c:2991 Read of size 1 at addr ffff88804a180e05 by task syz-executor191/8437 CPU: 0 PID: 8437 Comm: syz-executor191 Not tainted 5.12.0-rc3+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x82/0x32c mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 f2fs_test_bit fs/f2fs/f2fs.h:2572 [inline] current_nat_addr fs/f2fs/node.h:213 [inline] get_next_nat_page fs/f2fs/node.c:123 [inline] __flush_nat_entry_set fs/f2fs/node.c:2888 [inline] f2fs_flush_nat_entries+0x258e/0x2960 fs/f2fs/node.c:2991 f2fs_write_checkpoint+0x1372/0x6a70 fs/f2fs/checkpoint.c:1640 f2fs_issue_checkpoint+0x149/0x410 fs/f2fs/checkpoint.c:1807 f2fs_sync_fs+0x20f/0x420 fs/f2fs/super.c:1454 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x1b5/0x260 fs/sync.c:48 generic_shutdown_super+0x70/0x370 fs/super.c:448 kill_block_super+0x97/0xf0 fs/super.c:1394 kill_f2fs_super+0x28c/0x370 fs/f2fs/super.c:4128 deactivate_locked_super+0x8c/0xf0 fs/super.c:335 deactivate_super fs/super.c:366 [inline] deactivate_super+0xad/0xd0 fs/super.c:362 cleanup_mnt+0x347/0x4b0 fs/namespace.c:1136 task_work_run+0xe0/0x1a0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x25c/0x270 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4527cb Code: 07 00 48 83 c4 08 5b 5d c3 66 0f 1f 44 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffed7ad9228 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00000000000020f6 RCX: 00000000004527cb RDX: 0000000000401ef8 RSI: 0000000000000002 RDI: 00007ffed7ad92e0 RBP: 00007ffed7ad92e0 R08: 000000000049c00c R09: 00007ffed7ad90b0 R10: 00000000fffffffd R11: 0000000000000206 R12: 00007ffed7ada350 R13: 0000000002287b70 R14: 00007ffed7ad9248 R15: 0000000000000001 Allocated by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] __kasan_slab_alloc+0x75/0x90 mm/kasan/common.c:460 kasan_slab_alloc include/linux/kasan.h:223 [inline] slab_post_alloc_hook mm/slab.h:516 [inline] slab_alloc_node mm/slub.c:2907 [inline] slab_alloc mm/slub.c:2915 [inline] kmem_cache_alloc+0x242/0x900 mm/slub.c:2920 getname_flags fs/namei.c:138 [inline] getname_flags+0xd2/0x5b0 fs/namei.c:128 user_path_at_empty+0x2a/0x50 fs/namei.c:2733 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x13c/0x370 fs/stat.c:195 vfs_fstatat fs/stat.c:217 [inline] vfs_lstat include/linux/fs.h:3240 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:372 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf6/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook mm/slub.c:1600 [inline] slab_free mm/slub.c:3161 [inline] kmem_cache_free+0xb4/0x450 mm/slub.c:3177 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x282/0x3e0 fs/namei.c:2463 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x13c/0x370 fs/stat.c:195 vfs_fstatat fs/stat.c:217 [inline] vfs_lstat include/linux/fs.h:3240 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:372 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88804a180000 which belongs to the cache names_cache of size 4096 The buggy address is located 3589 bytes inside of 4096-byte region [ffff88804a180000, ffff88804a181000) The buggy address belongs to the page: page:00000000b163d35e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4a180 head:00000000b163d35e order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4fff00000010200(slab|head) raw: 04fff00000010200 dead000000000100 dead000000000122 ffff888040005140 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804a180d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804a180d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804a180e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804a180e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804a180f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== The attachment is a reproduce. Regards, butt3rflyh4ck.
// 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> 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 void use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } 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) #define sys_memfd_create 319 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(sys_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; } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { int iter = 0; DIR* dp = 0; retry: while (umount2(dir, MNT_DETACH) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } struct dirent* ep = 0; while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, MNT_DETACH) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, MNT_DETACH)) exit(1); } } closedir(dp); for (int i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, MNT_DETACH)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } exit(1); } } 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++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); reset_loop(); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); 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; } remove_dir(cwdbuf); } } void execute_one(void) { memcpy((void*)0x20000000, "f2fs\000", 5); memcpy((void*)0x20000100, "./mnt\000", 6); *(uint64_t*)0x20000200 = 0x20010000; memcpy((void*)0x20010000, "\x10\x20\xf5\xf2\x01\x00\x0e\x00\x09\x00\x00\x00\x03\x00\x00\x00\x0c\x00\x00\x00\x09\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x18\x00\x00\x00\x1f\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x18\x00\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00\x06\x00\x00\x00\x0a\x00\x00\x00\x0e\x00\x00\x00\x10\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\xa3\xbd\x86\x5d\xa4\xe8\x4b\x25\x9c\xaa\xc9\x03\x30\x88\x87\xeb\x00\x00\x00\x00", 128); *(uint64_t*)0x20000208 = 0x80; *(uint64_t*)0x20000210 = 0x400; *(uint64_t*)0x20000218 = 0; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0x860; *(uint64_t*)0x20000230 = 0; *(uint64_t*)0x20000238 = 0; *(uint64_t*)0x20000240 = 0x57; *(uint64_t*)0x20000248 = 0; *(uint64_t*)0x20000250 = 0; *(uint64_t*)0x20000258 = 0xb80; *(uint64_t*)0x20000260 = 0; *(uint64_t*)0x20000268 = 0; *(uint64_t*)0x20000270 = 0xc80; *(uint64_t*)0x20000278 = 0; *(uint64_t*)0x20000280 = 0; *(uint64_t*)0x20000288 = 0xec0; *(uint64_t*)0x20000290 = 0; *(uint64_t*)0x20000298 = 0; *(uint64_t*)0x200002a0 = 0x1400; *(uint64_t*)0x200002a8 = 0; *(uint64_t*)0x200002b0 = 0; *(uint64_t*)0x200002b8 = 0x9797; *(uint64_t*)0x200002c0 = 0; *(uint64_t*)0x200002c8 = 0; *(uint64_t*)0x200002d0 = 0x1a80; *(uint64_t*)0x200002d8 = 0; *(uint64_t*)0x200002e0 = 0; *(uint64_t*)0x200002e8 = 0x1b80; *(uint64_t*)0x200002f0 = 0; *(uint64_t*)0x200002f8 = 0; *(uint64_t*)0x20000300 = 0x1c80; *(uint64_t*)0x20000308 = 0; *(uint64_t*)0x20000310 = 0; *(uint64_t*)0x20000318 = 0x1ec0; *(uint64_t*)0x20000320 = 0x200106c0; memcpy((void*)0x200106c0, "\x0b\xd0\x3b\x75\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x0d\x00\x00\x00\x10\x00\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x0b\x00\x00\x00\x05\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x01\x00\x00\x06\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x40\x00\x00\x00\x40\x00\x00\x00\xfc\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 192); *(uint64_t*)0x20000328 = 0xc0; *(uint64_t*)0x20000330 = 0x200000; *(uint64_t*)0x20000338 = 0x20010780; memcpy((void*)0x20010780, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd9\xfa\x28\xd5\x01\x00\x03\x00\x00\x05\x00\x03\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); *(uint64_t*)0x20000340 = 0x40; *(uint64_t*)0x20000348 = 0x200fe0; *(uint64_t*)0x20000350 = 0x200107c0; memcpy((void*)0x200107c0, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x00\x00\x00\x00\x00\x01\x0c\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); *(uint64_t*)0x20000358 = 0x40; *(uint64_t*)0x20000360 = 0x2011e0; *(uint64_t*)0x20000368 = 0x20010800; memcpy((void*)0x20010800, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x20000370 = 0x20; *(uint64_t*)0x20000378 = 0x201240; *(uint64_t*)0x20000380 = 0x20010820; memcpy((void*)0x20010820, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x14\x00", 32); *(uint64_t*)0x20000388 = 0x20; *(uint64_t*)0x20000390 = 0x201280; *(uint64_t*)0x20000398 = 0x20010840; memcpy((void*)0x20010840, "\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x01\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x200003a0 = 0x20; *(uint64_t*)0x200003a8 = 0x2012e0; *(uint64_t*)0x200003b0 = 0x20010860; memcpy((void*)0x20010860, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0b\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x200003b8 = 0x20; *(uint64_t*)0x200003c0 = 0x201320; *(uint64_t*)0x200003c8 = 0x20010880; memcpy((void*)0x20010880, "\x00\x00\x00\x05\x00\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x200003d0 = 0x20; *(uint64_t*)0x200003d8 = 0x201380; *(uint64_t*)0x200003e0 = 0; *(uint64_t*)0x200003e8 = 0; *(uint64_t*)0x200003f0 = 0x2013e0; *(uint64_t*)0x200003f8 = 0; *(uint64_t*)0x20000400 = 0; *(uint64_t*)0x20000408 = 0x202000; *(uint64_t*)0x20000410 = 0; *(uint64_t*)0x20000418 = 0; *(uint64_t*)0x20000420 = 0x202fe0; *(uint64_t*)0x20000428 = 0; *(uint64_t*)0x20000430 = 0; *(uint64_t*)0x20000438 = 0x203fde; *(uint64_t*)0x20000440 = 0x20010920; memcpy((void*)0x20010920, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x0b\xd0\x3b\x75\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x0d\x00\x00\x00\x10\x00\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x0b\x00\x00\x00\x05\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x01\x00\x00\x06\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x40\x00\x00\x00\x40\x00\x00\x00\xfc\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 224); *(uint64_t*)0x20000448 = 0xe0; *(uint64_t*)0x20000450 = 0x204fe0; *(uint64_t*)0x20000458 = 0x20010a00; memcpy((void*)0x20010a00, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd9\xfa\x28\xd5", 32); *(uint64_t*)0x20000460 = 0x20; *(uint64_t*)0x20000468 = 0x205fe0; *(uint64_t*)0x20000470 = 0x20010a20; memcpy((void*)0x20010a20, "\x0b\xd0\x3b\x75\xd9\xfa\x28\xd5\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x20000478 = 0x20; *(uint64_t*)0x20000480 = 0x3ff000; *(uint64_t*)0x20000488 = 0; *(uint64_t*)0x20000490 = 0; *(uint64_t*)0x20000498 = 0x3ff040; *(uint64_t*)0x200004a0 = 0; *(uint64_t*)0x200004a8 = 0; *(uint64_t*)0x200004b0 = 0x400000; *(uint64_t*)0x200004b8 = 0; *(uint64_t*)0x200004c0 = 0; *(uint64_t*)0x200004c8 = 0x400fe0; *(uint64_t*)0x200004d0 = 0; *(uint64_t*)0x200004d8 = 0; *(uint64_t*)0x200004e0 = 0x405000; *(uint64_t*)0x200004e8 = 0; *(uint64_t*)0x200004f0 = 0; *(uint64_t*)0x200004f8 = 0x405fe0; *(uint64_t*)0x20000500 = 0x20010c60; memcpy((void*)0x20010c60, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x00\x03\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); *(uint64_t*)0x20000508 = 0x40; *(uint64_t*)0x20000510 = 0xa00000; *(uint64_t*)0x20000518 = 0x20010ca0; memcpy((void*)0x20010ca0, "\xed\x41\x00\x00\xe8\x03\x00\x00\xe8\x03\x00\x00\x02\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x55\xff\xc6\x5f\x00\x00\x00\x00\x55\xff\xc6\x5f\x00\x00\x00\x00\x55\xff\xc6\x5f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 96); *(uint64_t*)0x20000520 = 0x60; *(uint64_t*)0x20000528 = 0x1000000; *(uint64_t*)0x20000530 = 0; *(uint64_t*)0x20000538 = 0; *(uint64_t*)0x20000540 = 0x1000160; *(uint64_t*)0x20000548 = 0x20010d20; memcpy((void*)0x20010d20, "\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x01\x10\x00\x00", 32); *(uint64_t*)0x20000550 = 0x20; *(uint64_t*)0x20000558 = 0x1000fe0; *(uint64_t*)0x20000560 = 0; *(uint64_t*)0x20000568 = 0; *(uint64_t*)0x20000570 = 0x1600000; *(uint64_t*)0x20000578 = 0; *(uint64_t*)0x20000580 = 0; *(uint64_t*)0x20000588 = 0x1600940; *(uint8_t*)0x20010da0 = 0; syz_mount_image(0x20000000, 0x20000100, 0x4000000, 0x26, 0x20000200, 0, 0x20010da0); } 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); use_temporary_dir(); loop(); return 0; }