| // WARNING: kobject bug in gfs2_sys_fs_add |
| // https://syzkaller.appspot.com/bug?id=057673a56dab61b3a447989b67f10b205111c8f4 |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <linux/loop.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| extern unsigned long long procid; |
| |
| struct fs_image_segment { |
| void* data; |
| uintptr_t size; |
| uintptr_t offset; |
| }; |
| |
| #define IMAGE_MAX_SEGMENTS 4096 |
| #define IMAGE_MAX_SIZE (32 << 20) |
| |
| #define SYZ_memfd_create 319 |
| |
| static uintptr_t syz_mount_image(uintptr_t fs, uintptr_t dir, uintptr_t size, |
| uintptr_t nsegs, uintptr_t segments, |
| uintptr_t flags, uintptr_t opts) |
| { |
| char loopname[64]; |
| int loopfd, err = 0, res = -1; |
| uintptr_t i; |
| struct fs_image_segment* segs = (struct fs_image_segment*)segments; |
| |
| if (nsegs > IMAGE_MAX_SEGMENTS) |
| nsegs = IMAGE_MAX_SEGMENTS; |
| for (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; |
| int memfd = syscall(SYZ_memfd_create, "syz_mount_image", 0); |
| if (memfd == -1) { |
| err = errno; |
| goto error; |
| } |
| if (ftruncate(memfd, size)) { |
| err = errno; |
| goto error_close_memfd; |
| } |
| for (i = 0; i < nsegs; i++) { |
| if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) { |
| } |
| } |
| snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); |
| 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; |
| } |
| } |
| mkdir((char*)dir, 0777); |
| if (strcmp((char*)fs, "iso9660") == 0) |
| flags |= MS_RDONLY; |
| if (mount(loopname, (char*)dir, (char*)fs, flags, (char*)opts)) { |
| err = errno; |
| goto error_clear_loop; |
| } |
| res = 0; |
| error_clear_loop: |
| ioctl(loopfd, LOOP_CLR_FD, 0); |
| error_close_loop: |
| close(loopfd); |
| error_close_memfd: |
| close(memfd); |
| error: |
| errno = err; |
| return res; |
| } |
| |
| static void execute_one(); |
| extern unsigned long long procid; |
| |
| void loop() |
| { |
| while (1) { |
| execute_one(); |
| } |
| } |
| |
| unsigned long long procid; |
| void execute_one() |
| { |
| memcpy((void*)0x200000c0, "gfs2", 5); |
| memcpy((void*)0x20000100, "./file0", 8); |
| *(uint64_t*)0x20000140 = 0x20000280; |
| *(uint64_t*)0x20000148 = 0; |
| *(uint64_t*)0x20000150 = 6; |
| *(uint64_t*)0x20000158 = 0x20000380; |
| *(uint64_t*)0x20000160 = 0; |
| *(uint64_t*)0x20000168 = 0x1f; |
| *(uint64_t*)0x20000170 = 0x20000480; |
| *(uint64_t*)0x20000178 = 0; |
| *(uint64_t*)0x20000180 = 0xd71; |
| memcpy((void*)0x20001480, "noquota", 7); |
| *(uint8_t*)0x20001487 = 0x2c; |
| memcpy((void*)0x20001488, "locktable", 9); |
| *(uint8_t*)0x20001491 = 0x3d; |
| memcpy((void*)0x20001492, "user.", 5); |
| *(uint8_t*)0x20001497 = 0x2c; |
| memcpy((void*)0x20001498, "locktable", 9); |
| *(uint8_t*)0x200014a1 = 0x3d; |
| memcpy((void*)0x200014a2, "user.", 5); |
| *(uint8_t*)0x200014a7 = 0x2c; |
| memcpy((void*)0x200014a8, "lockproto=lock_nolock", 21); |
| *(uint8_t*)0x200014bd = 0x2c; |
| *(uint8_t*)0x200014be = 0; |
| syz_mount_image(0x200000c0, 0x20000100, 5, 3, 0x20000140, 0x800000, |
| 0x20001480); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| for (procid = 0; procid < 8; procid++) { |
| if (fork() == 0) { |
| for (;;) { |
| loop(); |
| } |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |