def test_file_o_direct():
# note:
# - `O_DIRECT` does not work if the file path is in memory, like "/dev/shm" or "/tmp"
# - currently only `MAP_PRIVATE` works with `io_uring_register_buffers`, `MAP_SHARED` will be fixed soon!
ring = io_uring()
cqes = io_uring_cqes()
if skip_os('5.14'): # was a bug < 5.14
read = mmap(-1, PAGESIZE, flags=MAP_PRIVATE)
write = mmap(-1, PAGESIZE, flags=MAP_PRIVATE)
else:
read = mmap(-1, PAGESIZE) # MAP_SHARED
write = mmap(-1, PAGESIZE)
write[0:11] = b'hello world'
iov = iovec(write, read)
try:
assert io_uring_queue_init(2, ring, 0) == 0
assert io_uring_register_buffers(ring, iov, len(iov)) == 0
# open - create local testing file.
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, b'.',
O_TMPFILE | O_RDWR | O_DIRECT, 0o700)
fd = submit_wait_result(ring, cqes)
# write
sqe = io_uring_get_sqe(ring)
io_uring_prep_write_fixed(sqe, fd, iov[0].iov_base, iov[0].iov_len, 0,
0)
assert submit_wait_result(ring, cqes) == PAGESIZE
# read
sqe = io_uring_get_sqe(ring)
io_uring_prep_read_fixed(sqe, fd, iov[1].iov_base, iov[1].iov_len, 0,
1)
assert submit_wait_result(ring, cqes) == PAGESIZE
# confirm
assert read[:20] == write[:20]
# close
sqe = io_uring_get_sqe(ring)
io_uring_prep_close(sqe, fd)
assert submit_wait_result(ring, cqes) == 0
finally:
read.close()
write.close()
io_uring_queue_exit(ring)
def test_register_fd_close():
ring = io_uring()
cqes = io_uring_cqes()
write = bytearray(b'hello world')
read = bytearray(11)
iov = iovec(write, read)
try:
assert io_uring_queue_init(2, ring, 0) == 0
# open - create local testing file.
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, b'.', O_TMPFILE | O_RDWR, 0o700)
fd = submit_wait_result(ring, cqes)
# register `fds`
fds = files(fd) # `int[fd]`
index = 0
assert io_uring_register_files(ring, fds, len(fds)) == 0
# close - right away after registering fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_close(sqe, fd)
assert submit_wait_result(ring, cqes) == 0
# write - using registered file index and closed fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_write(sqe, index, iov[0].iov_base, iov[0].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# read - using registered file index and closed fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_read(sqe, index, iov[1].iov_base, iov[1].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# confirm
assert write == read
# unregister - index
fds = files(-1)
assert io_uring_register_files_update(ring, index, fds, 1) == 1
# re-read - should not be able to since index was unregistered
with raises(OSError): # [Errno 9] Bad file descriptor
sqe = io_uring_get_sqe(ring)
io_uring_prep_read(sqe, index, iov[1].iov_base, iov[1].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
finally:
io_uring_queue_exit(ring)
def test_register_file_update():
ring = io_uring()
cqes = io_uring_cqes()
write = bytearray(b'hello world')
read = bytearray(11)
iov = iovec(write, read)
fds = files(-1, -1, -1, -1) # prep 4 fd spots
index = 2 # only use index ``2`` of the `fds`
try:
assert io_uring_queue_init(2, ring, 0) == 0
# register 4 `fds`
assert io_uring_register_files(ring, fds, len(fds)) == 0
# open - create local testing file.
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, b'.', O_TMPFILE | O_RDWR, 0o700)
fd = submit_wait_result(ring, cqes)
fds[index] = fd
fd2 = files(fd) # `int[fd]`
# register - update only the index ``2`` value
assert io_uring_register_files_update(ring, index, fd2, 1) == 1
# close
sqe = io_uring_get_sqe(ring)
io_uring_prep_close(sqe, fds[index])
assert submit_wait_result(ring, cqes) == 0
# write - using registered file index vs fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_write(sqe, index, iov[0].iov_base, iov[0].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# read - using registered file index vs fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_read(sqe, index, iov[1].iov_base, iov[1].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# confirm
assert write == read
# unregister
assert io_uring_unregister_files(ring) == 0
finally:
io_uring_queue_exit(ring)
def test_register_file():
ring = io_uring()
cqes = io_uring_cqes()
write = bytearray(b'hello world')
read = bytearray(11)
iov = iovec(write, read)
try:
assert io_uring_queue_init(2, ring, 0) == 0
# open - create local testing file.
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, b'.', O_TMPFILE | O_RDWR, 0o700)
fd = submit_wait_result(ring, cqes)
# register `fds`
fds = files(fd) # `int[fd]`
index = 0
assert io_uring_register_files(ring, fds, len(fds)) == 0
# close
sqe = io_uring_get_sqe(ring)
io_uring_prep_close(sqe, fd)
assert submit_wait_result(ring, cqes) == 0
# write - using registered file index vs fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_write(sqe, index, iov[0].iov_base, iov[0].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# read - using registered file index vs fd
sqe = io_uring_get_sqe(ring)
io_uring_prep_read(sqe, index, iov[1].iov_base, iov[1].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# confirm
assert write == read
finally:
# note: let exit also unregister fds
io_uring_queue_exit(ring)
def test_multiple_register_fd_mix(tmpdir):
ring = io_uring()
cqes = io_uring_cqes()
loop = randint(2, 5)
data = b'hello world'
write = [bytearray(data) for _ in range(loop)]
iov = iovec(*write)
fds = files(-1 for _ in range(loop)) # prep fds
try:
assert io_uring_queue_init(2, ring, 0) == 0
# initialize register
assert io_uring_register_files(ring, fds, len(fds)) == 0
for index in range(loop): # index = 0, 1, ...
path = join(tmpdir, f'register-fd-mix-{index}.txt').encode()
# open
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, path, O_CREAT | O_RDWR, 0o700)
fd = submit_wait_result(ring, cqes)
# register update
if index == 1: # skip registering middle one!
fd1 = fd
else:
fds = files(fd)
assert io_uring_register_files_update(ring, index, fds, 1) == 1
# close registered fd only
sqe = io_uring_get_sqe(ring)
io_uring_prep_close(sqe, fd)
assert submit_wait_result(ring, cqes) == 0
# write
for index in range(loop):
sqe = io_uring_get_sqe(ring)
if index == 1: # write using fd
io_uring_prep_write(sqe, fd1, iov[index].iov_base, iov[index].iov_len, 0)
else: # write using registered file index
io_uring_prep_write(sqe, index, iov[index].iov_base, iov[index].iov_len, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
# read
for index in range(loop):
path = join(tmpdir, f'register-fd-mix-{index}.txt').encode()
stat = statx()
sqe = io_uring_get_sqe(ring)
io_uring_prep_statx(sqe, AT_FDCWD, path, 0, 0, stat)
assert submit_wait_result(ring, cqes) == 0
length = stat[0].stx_size # get written file size
# note: even though size is known, get it using statx
read = bytearray(length)
buffer = from_buffer(read)
sqe = io_uring_get_sqe(ring)
if index == 1:
io_uring_prep_read(sqe, fd1, buffer, length, 0)
else: # read using registered file index
io_uring_prep_read(sqe, index, buffer, length, 0)
sqe.flags |= IOSQE_FIXED_FILE
assert submit_wait_result(ring, cqes) == 11
assert read == data
# close
for index in range(loop):
if index == 1:
sqe = io_uring_get_sqe(ring)
io_uring_prep_close(sqe, fd1)
assert submit_wait_result(ring, cqes) == 0
else: # unregister file index
fds = files(-1)
assert io_uring_register_files_update(ring, index, fds, 1) == 1
finally:
io_uring_queue_exit(ring)
def open_file(ring, cqes, file_path, cred_id):
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, file_path, O_RDONLY, 0)
if cred_id is not None:
sqe.personality = cred_id
return submit_wait_result(ring, cqes) # fd
def test_personality(tmpdir):
# note: `sqe.personality` has limited use-case like its restricts to opening `fd`
# but not for read, write, close, ...
ring = io_uring()
cqes = io_uring_cqes()
file_path = join(tmpdir, 'test_personality_root_file.txt').encode()
try:
assert io_uring_queue_init(2, ring, 0) == 0
# create & open file only root can access!
sqe = io_uring_get_sqe(ring)
io_uring_prep_openat(sqe, AT_FDCWD, file_path, O_CREAT, 0o700)
fd = submit_wait_result(ring, cqes)
close_file(ring, cqes, fd)
root_cred_id = io_uring_register_personality(ring)
assert root_cred_id == 1
# normal "user"
setegid(1000)
seteuid(1000)
user_cred_id = io_uring_register_personality(ring)
assert user_cred_id == 2
# try to open root file as normal user.
with raises(PermissionError):
open_file(ring, cqes, file_path, None)
# bad personality
with raises(OSError): # Invalid argument
open_file(ring, cqes, file_path, 2)
# what about default `0` for personality
with raises(PermissionError):
open_file(ring, cqes, file_path, 0)
# try again to open file with root credential
fd = open_file(ring, cqes, file_path, root_cred_id)
close_file(ring, cqes, fd)
# "root" again
setegid(0)
seteuid(0)
# try again to open file with root credential
fd = open_file(ring, cqes, file_path, root_cred_id)
close_file(ring, cqes, fd)
# try again to open file with no credential
fd = open_file(ring, cqes, file_path, None)
close_file(ring, cqes, fd)
# try again to open file with "user" credential
with raises(PermissionError):
open_file(ring, cqes, file_path, user_cred_id)
# "user" again
setegid(1000)
seteuid(1000)
# try to unregister "root" personality
assert io_uring_unregister_personality(ring, root_cred_id) == 0
# try to unregister "user" personality
assert io_uring_unregister_personality(ring, user_cred_id) == 0
# try to open file with unregistered old "root" credential
with raises(OSError): # Invalid argument
open_file(ring, cqes, file_path, root_cred_id)
finally:
# make sure its "root" again to allow proper cleanup
seteuid(0)
setegid(0)
if exists(file_path):
unlink(file_path)
io_uring_queue_exit(ring)
def submit_open_entry(self, fpath, flags, mode, dir_fd):
sqe = self._get_sqe()
path = os.path.abspath(fpath).encode()
liburing.io_uring_prep_openat(sqe, dir_fd, path, flags, mode)
return self._submit(RequestType.OPEN, sqe, path)
