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NetBSD/doc/TODO.ptrace

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Remove the filesystem tracing feature This is a legacy interface from 4.4BSD, and it was introduced to overcome shortcomings of ptrace(2) at that time, which are no longer relevant (performance). Today /proc/#/ctl offers a narrow subset of ptrace(2) commands and is not applicable for modern applications use beyond simplistic tracing scenarios. This removal will simplify kernel internals. Users will still be able to use all the other /proc files. This change won't affect other procfs files neither Linux compat features within mount_procfs(8). /proc/#/ctl isn't available on Linux. Remove: - /proc/#/ctl from mount_procfs(8) - P_FSTRACE note from the documentation of ps(1) - /proc/#/ctl and filesystem tracing documentation from mount_procfs(8) - KAUTH_REQ_PROCESS_PROCFS_CTL documentation from kauth(9) - source code file miscfs/procfs/procfs_ctl.c - PFSctl and procfs_doctl() from sys/miscfs/procfs/procfs.h - KAUTH_REQ_PROCESS_PROCFS_CTL from sys/sys/kauth.h - PSL_FSTRACE (0x00010000) from sys/sys/proc.h - P_FSTRACE (0x00010000) from sys/sys/sysctl.h Reduce code complexity after removal of this functionality. Update TODO.ptrace accordingly: remove two entries about /proc tracing. Do not keep legacy notes as comments in the headers about removed PSL_FSTRACE / P_FSTRACE, as this interface had little number of users (close or equal to zero). Proposed on tech-kern@. All filesystem tracing utility users are encouraged to switch to ptrace(2). Sponsored by <The NetBSD Foundation>
2017-08-28 03:46:06 +03:00
$NetBSD: TODO.ptrace,v 1.29 2017/08/28 00:46:07 kamil Exp $
Add initial TODO list for the ptrace(2) (and procfs) interface. Sponsored by <The NetBSD Foundation>
2016-12-13 12:44:35 +03:00
Items we (currently) plan to finish in the ptrace(2) field:
- verify ppid of core dump generated with PT_DUMPCORE
it must point to the real parent, not tracer
- adapt OpenBSD regress test (regress/sys/ptrace/ptrace.c) for the ATF context
Update TODO.ptrace Added: - reiterate over FreeBSD tests and add missing ones if applicable Sponsored by <The NetBSD Foundation>
2017-01-26 04:12:13 +03:00
- reiterate over FreeBSD tests and add missing ones if applicable
Add initial TODO list for the ptrace(2) (and procfs) interface. Sponsored by <The NetBSD Foundation>
2016-12-13 12:44:35 +03:00
- add PT_DUMPCORE tests in the ATF framework
- add ATF tests for PT_WRITE_I and PIOD_WRITE_I - test mprotect restrictions
Update TODO.ptrace Note BSD4.4-like /proc debugging removal Explain kevent(2)-based debugging proposal Sponsored by <The NetBSD Foundation>
2017-02-13 18:29:18 +03:00
- research kevent support for tracing a process over a file descriptor,
this means alternative to wait(2)-based events with passing events over the
kqueue API - signal handlers are global per application and they clash with
GUI toolkits (and perhaps other libraries) - this is long term wishlist in
GDB for Linux - the current approach is to fork and debug through GDB remote
protocol (this is how it is done in LLDB)
Update TODO.ptrace Add new entries: - add support for PT_STEP, PT_GETREGS, PT_SETREGS, PT_GETFPREGS, PT_SETFPREGS in all ports - integrate all ptrace(2) features in gdb - add ptrace(2) NetBSD support in LLDB Sponsored by <The NetBSD Foundation>
2016-12-14 09:26:04 +03:00
- add support for PT_STEP, PT_GETREGS, PT_SETREGS, PT_GETFPREGS, PT_SETFPREGS
in all ports
Update TODO.ptrace Removed: - evaluate equivalent for PTRACE_O_TRACECLONE from Linux clone(2)-like calls are traced with PTRACE_FORK, PTRACE_VFORK and PTRACE_VFORK_DONE. VFORK ones block parent till termination or execve(2) of its child. Added: - add proper implementation of PTRACE_VFORK for vfork(2)-like events Currently PTRACE_VFORK is a stub. Sponsored by <The NetBSD Foundation>
2017-01-14 04:36:28 +03:00
- add proper implementation of PTRACE_VFORK for vfork(2)-like events
Add new entry in TODO.ptrace New entry: - add ATF tests for SIGCHLD
2016-12-24 08:43:31 +03:00
- add ATF tests for SIGCHLD
Update TODO.ptrace with new entries Added entries: - add support to read debugger events via a file descriptor in procfs (kevent(2)), it's still useful in cases when a parent traces tracee and has to call waitpid(2) for its child - as this clashes with GUI toolkits - fix more calls for netbsd32 compat Sponsored by <The NetBSD Foundation>
2017-02-12 08:21:34 +03:00
- fix more calls for netbsd32 compat
Add new entry to TODO.ptrace research ipkdb(4) Sponsored by <The NetBSD Foundation>
2017-02-14 21:38:07 +03:00
- research ipkdb(4)
Add new entry in TODO.ptrace Research kgdb. It should be supported by GDB and LLDB. Sponsored by <The NetBSD Foundation>
2017-02-18 00:22:02 +03:00
- research kgdb(4)
Add new entry to TODO.ptrace check 64-bit debugger on 64-bit kernel tracing capabilities of 32-bit tracee Sponsored by <The NetBSD Foundation>
2017-02-20 06:37:24 +03:00
- check 64-bit debugger on 64-bit kernel tracing capabilities of 32-bit tracee
Add initial TODO list for the ptrace(2) (and procfs) interface. Sponsored by <The NetBSD Foundation>
2016-12-13 12:44:35 +03:00
and of course: fix as many bugs as possible.
Features in ELF, DWARF, CTF, DTrace are out of scope of the above list.