If a resource is never used as an input, it is not useful.
It's effectively the same as using an integer.
Detect such cases, they are quite confusing.
Fix all existing errors in descriptions.
This uncovered some interesting bugs as well,
e.g. use of a completely unrelated fd subtype after copy-paste
(while the resource that was supposed to be used there is completely unused).
* sys/netbsd: Adding syscalls related to mount(2),uname(2) and sockets
* sys/netbsd: Adding missing flags for fstatat(2)
* sys/netbsd: reordering rlimit_type
* sys/netbsd: reordering flags for stat(2) and mount(2)
Regenerate const files on next-20200729.
Change conn handle to 200 because it also seems to be matches
against phy_handle fields which are int8 (current 256 does not fit into int8).
Use 200 for all handle's and all phy_handle's.
Remove hci_evt_le_cis_req, it does not seem to be used in the kernel.
Restrict some event types and statuses.
Add rssi field to hci_ev_le_advertising_info.
Use bytesize for some of the data length fields.
* all: initialize vhci in linux
* executor/common_linux.h: improve vhci initialization
* pkg/repro/repro.go: add missing vhci options
* executor/common_linux.h: fix type and add missing header
* executor, pkg: do it like NetInjection
* pkg/csource/csource.go: do not emit syz_emit_vhci if vhci is not enabled
* executor/common_linux.h: fix format string
* executor/common_linux.h: initialize with memset
For som reason {0} gets complains about missing braces...
* executor/common_linux.h: simplify vhci init
* executor/common_linux.h: try to bring all available hci devices up
* executor/common_linux.h: find which hci device has been registered
* executor/common_linux.h: use HCI_VENDOR_PKT response to retrieve device id
* sys/linux/dev_vhci.txt: fix structs of inquiry and report packets
* executor/common_linux.h: remove unnecessary return statement and check vendor_pkt read size
* executor/common_linux.h: remove unnecessary return statement and check vendor_pkt read size
* sys/linux/dev_vhci.txt: pack extended_inquiry_info_t
* sys/linux/l2cap.txt: add l2cap_conf_opt struct
* executor/common_linux.h: just fill bd addr will 0xaa
* executor/common_linux.h: just fill bd addr will 0xaa
It is hard for the fuzzer to generate correct programs using mmap calls
with fuzzer-provided mmap length. This wrapper ensures correct length
computation.
* sys/netbsd: adding ksem related syscalls
* sys/netbsd: adding missing header files to lwp.txt
* sys/netbsd: updating descriptions for ksem family syscalls
* sys/netbsd: updating descriptions for ksem family syscalls
* sys/linux: enhanced descs for io_uring
Introduced pseudo-call "syz_io_uring_put_sqes_on_ring()" for writing
submission queue entries (sqes) on sq_ring, which was obtained by
mmap'ping the offsets obtained from io_uring_setup().
Added descriptions for io_ring_register operations that were missing
earlier.
Did misc changes to adapt the descriptions for the updates on the
io_uring subsystem.
* pkg/host: add io_uring pseudo-syscall
* executor/common_linux.h: fix issues with io_uring pseudo-syscall
* executor: fixed io_uring offset computation
* executor: fixes and refactorings in syz_io_uring_submit()
* executor: added syz_io_uring_complete() pseudo-syscall for io_uring
* sys/linux: added descriptions for io_uring operations
Each operation requires a different struct io_uring_sqe set up. Those
are described to be submitted to the sq ring.
* executor: use uint32 instead of uint32_t
* executor: remove nonfailing from pseudo-calls
* sys/linux: fix io_uring epoll_ctl sqe
* prog: fix TestTransitivelyEnabledCallsLinux()
The newly introduced syscall, syz_io_uring_submit$IORING_OP_EPOLL_CTL,
uses fd_epoll. Adapt TestTransitivelyEnabledCallsLinux() to account for
this.
* sys/linux: add IORING_OP_PROVIDE_BUFFERS and IORING_OP_REMOVE_BUFFERS
* sys/linux: fix IORING_OP_WRITE_FIXED and IORING_OP_READ_FIXED
addr and len are for the buffer located at buf_index
* sys/linux: io_uring: use reg. bufs for READ, READV, RECV, RECVMSG
As a result, IOSQE_BUFFER_SELECT_BIT is included in the iosqe_flags.
* sys/linux: io_uring: misc fixes
* sys/linux: io_uring: add IORING_SETUP_ATTACH_WQ
* executor: refactorings on io_uring pseudo syscalls
* sys/linux: io_uring: fix desc for params.cq_entries
* executor: fix SQ_ARRAY_OFFSET computation
This is required with the fix in io_uring kernel code.
https://lore.kernel.org/io-uring/CACT4Y+bgTCMXi3eU7xV+W0ZZNceZFUWRTkngojdr0G_yuY8w9w@mail.gmail.com/T/#t
* executor: added pseudosyscall syz_io_uring_cq_eventfd_toggle()
The usage of cq_ring->flags is only for manipulating
IORING_CQ_EVENTFD_DISABLED bit. This is achieved by a pseudo-syscall,
which toggles the bit.
* executor: added pseudocall syz_io_uring_put_ring_metadata
Removed syz_io_uring_cq_eventfd_toggle() and introduced
syz_io_uring_put_ring_metadata() instead. We have many pieces of
metadata for both sq_ring and cq_ring, for which we are given the
offsets, and some of are not supposed to be manipulated by the
application. Among them, both sq and cq flags can be changed. Both valid
and invalid cases might cause interesting outcomes. Use the newly
introduced pseudo syscall to manipulate them randomly while also
manipulating the flags to their special values.
* executor: added pseudo-syscall syz_memcpy_off
Removed syz_io_uring_put_ring_metadata() and instead added a much more
generic pseudo systemcall to achieve the task. This should benefit other
subsystems as well.
* sys/linux: refactored io_uring descriptions
syz_io_uring_submit() is called with a union of sqes to reduce
duplication of other parameters of the function.
io_uring_sqe is templated with io_uring_sqe_t, and this template type is
used to describe sqes for different ops.
The organization of io_uring.txt is changed.
* sys/linux: io_uring: improved descs to utilize registered files
The files are registered using
io_uring_register$IORING_REGISTER_FILES(). When IOSQE_FIXED_FILE_BIT is
enabled in iosqe_flags in sqe, a variety of operations can use those
registered files using the index of the file instead of fd.
Changed the sqe descriptions for the eligible operations to utilize
this.
* sys/linux: io_uring: improved the descs to utilize personality_id in sqes
A personality_id can be registered for a io_uring fd using
io_uring_register$IORING_REGISTER_PERSONALITY(). This id can be utilized
within sqes. This commit improves the descs for io_uring to utilize it.
In addition, the descriptions for the misc field in io_uring_sqe_t is
refactored as most are shared among sqes.
* sys/linux: io_uring: utilized cqe.res
io_uring_cqe.res is used to carry the return value of operations
achieved through io_uring. The only operations with meaningful return
values (in terms of their possible usage) are openat and openat2. The
pseudo-syscall syz_io_uring_complete() is modified to account for this
and return those fds. The description for sqe_user_data is splitted into
two to identify openat and non-openat io_uring ops.
IORING_OP_IOCTL was suggested but never supported in io_uring. Thus, the
note on this is removed in the descriptions.
tee() expects pipefds, thus, IORING_OP_TEE. The descriptions for the
pipe r/w fds are written as ordinary fd. Thus, in the description for
IORING_OP_TEE, which is io_uring_sqe_tee, fd is used in the place where
pipefds are expected. The note on this is removed in the descriptions.
* sys/linux/test: added test for io_uring
This is not tested yet.
* sys/linux/test: fixed the test for io_uring
The changes successfully pass the sys/linux/test/io_uring test.
sys/linux/io_uring.txt: sq_ring_ptr and cq_ring_ptr are really the same.
Thus, they are replaced with ring_ptr.
executor/common_linux.h: thanks to io_uring test, a bug is found in
where the sq_array's address is computed in syz_io_uring_submit().
Fixed. In addition, similar to the descriptions, the naming for the
ring_ptr is changed from {sq,cq}_ring_ptr to ring_ptr.
* sys/linux: io_uring: misc fixes
* sys/linux: io_uring: changed the sqe_user_data enum
Used a smaller range to ease the collisions. Used comperatively unique
and magic numbers for openat user_data to avoid thinking as if the cqe
belongs to openat while the user_data is coming from some random
location.
* pkg/host: added checks for io_uring syscall
* pkg/host: fixed checks for io_uring syscall
* sys/linux: fixed io_uring test
The raw system calls have call signatures that differ slightly from
that of the corresponding GNU C library wrapper functions. The descriptions
are fixed to reflect the raw system calls, which unpacks the offset into
two args, off_l and off_h.
Add descriptions for OSS mixer devices, which includes `/dev/mixer` and
its proc file `/proc/asound/card*/oss_mixer`. These descriptions should
improve the coverage of `sound/core/oss/mixer_oss.c`.
Update #533.
Currently we sprinkle NONFAILING all over pseudo-syscall code,
around all individual accesses to fuzzer-generated pointers.
This is tedious manual work and subject to errors.
Wrap execute_syscall invocation with NONFAILING in execute_call once instead.
Then we can remove NONFAILING from all pseudo-syscalls and never get back to this.
Potential downsides: (1) this is coarser-grained and we will skip whole syscall
on invalid pointer, but this is how normal syscalls work as well,
so should not be a problem; (2) we will skip any clean up (closing of files, etc)
as well; but this may be fine as well (programs can perfectly leave open file
descriptors as well).
Update #1918
We set HostFuzzer for all test targets b/c in some contexts
they needed the same special behavior as real HostFuzzer targets
(e.g no checking enabled syscalls).
However, in some other contexts they don't the same special
behavior as real HostFuzzer targets. For example, pkg/ipc
does rate limiting for HostFuzzer and pkg/runtest don't run
C tests for HostFuzzer.
Add special case for test targets in pkg/host,
and don't set HostFuzzer for all test targets
(keep it for one target for better coverage).
