SEFS depends on version 0.9 of bitvec crate, which has been yanked on crates.io
by the crate author for some reasons. To fix this, we upgrade to the latest
version of bitvec crate.
This commit introduces a unified logging strategy, summarized as below:
1. Use `error!` to mark errors or unexpected conditions, e.g., a
`Result::Err` returned from a system call.
2. Use `warn!` to warn about potentially problematic issues, e.g.,
executing a workaround or fake implementation.
3. Use `info!` to show important events (from users' perspective) in
normal execution, e.g., creating/exiting a process/thread.
4. Use `debug!` to track major events in normal execution, e.g., the
high-level arguments of a system call.
5. Use `trace!` to record the most detailed info, e.g., when a system
call enters and exits the LibOS.
Now one can specify the log level of the LibOS by setting `OCCLUM_LOG_LEVEL`
environment variable. The possible values are "off", "error", "warn",
"info", and "trace".
However, for the sake of security, the log level of a release enclave
(DisableDebug = 1 in Enclave.xml) is always "off" (i.e., no log) regardless of
the log level specified by the untrusted environment.
This commit introduces a system call table, which brings several benefits:
1. The table is a centralized info hub that one can find an answer for every
question about system calls, e.g., what is the number and arguments of a
system call, is it implemented or supported, and if so, what is the
function that actual implements it.
2. System call-related code can be automatically derived from the system call
table through a clever use of macros. In this way, the code avoids repeating
itself.
Before this commit, there are two strange bugs:
1. No backtraces are displayed on panic by Rust; and,
2. Thread local storage in Rust sometimes causes panics.
It turns out that the the root cause of the two bugs are the same: Occlum's
patch to Intel SGX SDK that informs SDK about the stack range of the currnet
LibOS user-level thread. The problem about this patch is that it modifies some
fundamental data structures and Rust SGX SDK does not know the modification.
This causes Rust SGX SDK to panic in certain conditions.
To resolve the conflict for good, this commit gets rid of the patch to Intel
SGX SDK by updating SDK's stack ranges upon user/kernel switch.
1. Use arch_prctl to replace RDFSBASE/WRFSBASE
Ptrace can't get right value if WRFSBASE is called which
will make debugger fail in simulation mode. Use arch_prctl
to replace these instructions in simulation mode.
2. Disable the busy thread in exit_group test
exit_group doesn't have a real implementation yet but test
under SGX simulation mode give core dump for exit_group test.
Disable the busy loop thread and the core dump disappear.
3. Add SDK lib path to LD_LIBRARY_PATH
Linker sometims can't find urts_sim and uae_service_sim when
running. Explicitly add path to LD_LIBRARY_PATH when running
occlum command.
Signed-off-by: sanqian.hcy <sanqian.hcy@antfin.com>
This commits is a dummy implementation of file advisory locks.
Specifically, for regular files, fcntl `F_SETLK` (i.e., acquiring
or releasing locks) always succeeds and fcntl `F_GETLK` (i.e., testing locks)
always returns no locks.
1. Move the system call handling functions into the "syscalls.rs"
2. Split syscall memory safe implementations into small sub-modules
3. Move the unix_socket and io_multiplexing into "net"
4. Remove some unnecessary code
It is slow to allocate big buffers using SGX SDK's malloc. Even worse, it
consumes a large amount of precious trusted memory inside enclaves. This
commit avoids using trusted buffers and allocates untrusted buffers for
sendmsg/recvmsg directly via OCall, thus improving the performance of
sendmsg/recvmsg. Note that this optimization does not affect the security of
network data as it has to be sent/received via OCalls.
Before this commit, using custom C types in ECalls/OCalls defined in Occlum's
EDL is cumbersme. Now this issue is resolved by providing `occlum_edl_types.h`
header file. There are two versions of this file: one is under
`src/libos/include/edl/` for LibOS, the other is under
`src/pal/include/edl/` for PAL. So now to define a new custom C type, just
edit the two versions of `occlum_edl_types.h` to define the type.
SGX SDK's sgx_init_quote may return SGX_ERROR_BUSY, which is previously not
handled. The implementation of ioctl for /dev/sgx is now fixed to handle this
error.
