v12: split test into its own patch
change from padding a u8 to using a u64
casting issues
checkpatch.pl
v11: backout complex compat code, change struct to more generic typing
(padding to ensure struct size is the same in 32 compat)
update selftest
tested selftest on 64 machine and in 32-bit compat mode
v10: move refactor code into patch ahead of change
add compat support
documentation change
v9: tglx feedback
whitespace
documentation of ptrace struct
shorten struct name
helper function for set_syscall_user_dispatch
use task variant of set/clear_syscall_work
use task variant of test_syscall_work in getter
selftest
[truncated version history]
Syscall user dispatch makes it possible to cleanly intercept system
calls from user-land. However, most transparent checkpoint software
presently leverages some combination of ptrace and system call
injection to place software in a ready-to-checkpoint state.
If Syscall User Dispatch is enabled at the time of being quiesced,
injected system calls will subsequently be interposed upon and
dispatched to the task's signal handler.
Patch summary:
- Refactor configuration setting interface to operate on a task
rather than current, so the set and error paths can be consolidated
- Implement a getter interface for Syscall User Dispatch config info.
To resume successfully, the checkpoint/resume software has to
save and restore this information. Presently this configuration
is write-only, with no way for C/R software to save it.
This was done in ptrace because syscall user dispatch is not part of
uapi. The syscall_user_dispatch_config structure was added to the
ptrace exports.
- Selftest for the new feature
Gregory Price (3):
syscall_user_dispatch: helper function to operate on given task
ptrace,syscall_user_dispatch: checkpoint/restore support for SUD
selftest,ptrace: Add selftest for syscall user dispatch config api
.../admin-guide/syscall-user-dispatch.rst | 4 ++
include/linux/syscall_user_dispatch.h | 18 +++++
include/uapi/linux/ptrace.h | 29 ++++++++
kernel/entry/syscall_user_dispatch.c | 65 ++++++++++++++---
kernel/ptrace.c | 9 +++
tools/testing/selftests/ptrace/.gitignore | 1 +
tools/testing/selftests/ptrace/Makefile | 2 +-
tools/testing/selftests/ptrace/get_set_sud.c | 72 +++++++++++++++++++
8 files changed, 191 insertions(+), 9 deletions(-)
create mode 100644 tools/testing/selftests/ptrace/get_set_sud.c
--
2.39.1
