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They deliver the logic of bypassing selected signals directly to the
debuggee, without informing the debugger.
This can be used to implement the QPassSignals GDB/LLDB protocol.
This call can be useful to avoid signal races in ATF ptrace tests.
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Remove mentions of obsolete PT_LWPINFO.
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Formatting by <mgorny>
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Reviewed by kamil.
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Reviewed by kamil.
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Add/remove some articles or other missing words.
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Introduce two new ptrace() requests: PT_GETXSTATE and PT_SETXSTATE,
that provide access to the extended (and extensible) set of FPU
registers on amd64 and i386. At the moment, this covers AVX (YMM)
and AVX-512 (ZMM, opmask) registers. It can be easily extended
to cover further register types without breaking backwards
compatibility.
PT_GETXSTATE issues the XSAVE instruction with all kernel-supported
extended components enabled. The data is copied into 'struct xstate'
(which -- unlike the XSAVE area itself -- has stable format
and offsets).
PT_SETXSTATE issues the XRSTOR instruction to restore the register
values from user-provided 'struct xstate'. The function replaces only
the specific XSAVE components that are listed in 'xs_rfbm' field,
making it possible to issue partial updates.
Both syscalls take a 'struct iovec' pointer rather than a direct
argument. This requires the caller to explicitly specify the buffer
size. As a result, existing code will continue to work correctly
when the structure is extended (performing partial reads/updates).
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Document that TRAP_EXEC can be returned for PT_SYSCALL.
Document truncated byte transfers.
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Add support for tracing vfork(2) events in the context of ptrace(2).
This API covers other frontends to fork1(9) like posix_spawn(2) or clone(2),
if they cause parent to wait for exec(2) or exit(2) of the child.
Changes:
- Add new argument to sigswitch() determining whether we need to acquire
the proc_lock or whether it's already held.
- Refactor fork1(9) for fork(2) and vfork(2)-like events.
Call sigswitch() from fork(1) for forking or vforking parent, instead of
emitting kpsignal(9). We need to emit the signal and suspend the parent,
returning to user and relock proc_lock.
- Add missing prototype for proc_stop_done() in kern_sig.c.
- Make sigswitch a public function accessible from other kernel code
including <sys/signalvar.h>.
- Remove an entry about unimplemented PTRACE_VFORK in the ptrace(2) man page.
- Permin PTRACE_VFORK in the ptrace(2) frontend for userland.
- Remove expected failure for unimplemented PTRACE_VFORK tests in the ATF
ptrace(2) test-suite.
- Relax signal routing constraints under a debugger for a vfork(2)ed child.
This intended to protect from signaling a parent of a vfork(2)ed child that
called PT_TRACE_ME, but wrongly misrouted other signals in vfork(2)
use-cases.
Add XXX comments about still existing problems and future enhancements:
- correct vfork(2) + PT_TRACE_ME handling.
- fork1(2) handling of scenarios when a process is collected in valid but
rare cases.
All ATF ptrace(2) fork[1-8] and vfork[1-8] tests pass.
Fix PR kern/51630 by Kamil Rytarowski (myself).
Sponsored by <The NetBSD Foundation>
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These operations cloned Linux's specific PTRACE_GETSIGMASK / PTRACE_SETSIGMASK.
This feature was useful in applications like rr/criu/reptyr-like, where
the ptrace(2) interface is abused for the purpose of constructing an arbitrary
process. It's not reliable and not portable. For the NetBSD case it will be
better to invent something dedicated for serializing and deserializing a
process with threads.
Noted on tech-toolchain@ and blog entry
"LLDB restoration and return to ptrace(2)"
https://blog.netbsd.org/tnf/entry/lldb_restoration_and_return_to
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Document PT_SETSTEP and PT_CLEARSTEP in ptrace(2).
Try to explain more details of PT_SYSCALL and PT_SYSCALLEMU.
The description of PT_*STEP has been obtained from FreeBSD.
Sponsored by <The NetBSD Foundation>
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PT_STEP and PT_DETACH cannot emit signals
PT_CONTINUE and PT_SYSCALL can emit signals
Pointed out by <chs>
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Not this interface in MD part.
Explain design choices.
Sponsored by <The NetBSD Foundation>
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Introduce new API for debuggers to allow/prevent execution of the specified
thread.
New ptrace(2) operations:
PT_RESUME Allow execution of a specified thread, change its state
from suspended to continued. The addr argument is unused.
The data argument specifies the LWP ID.
This call is equivalent to _lwp_continue(2) called by a
traced process. This call does not change the general
process state from stopped to continued.
PT_SUSPEND Prevent execution of a specified thread, change its state
from continued to suspended. The addr argument is unused.
The data argument specifies the requested LWP ID.
This call is equivalent to _lwp_suspend(2) called by a
traced process. This call does not change the general
process state from continued to stopped.
This interface is modeled after FreeBSD, however with NetBSD specific arguments
passed to ptrace(2) -- FreeBSD passes only thread id, NetBSD passes process and
thread id.
Extend PT_LWPINFO operation in ptrace(2) to report suspended threads. In the
ptrace_lwpinfo structure in pl_event next to PL_EVENT_NONE and PL_EVENT_SIGNAL
add new value PL_EVENT_SUSPENDED.
Add new errno(2) value EDEADLK that might be returned by ptrace(2). It prevents
dead-locking in a scenario of resuming a process or thread that is prevented
from execution. This fixes bug that old API was vulnerable to this scenario.
Kernel bump delayed till introduction of PT_GETDBREGS/PT_SETDBREGS soon.
Add new ATF tests:
- resume1
Verify that a thread can be suspended by a debugger and later
resumed by the debugger
- suspend1
Verify that a thread can be suspended by a debugger and later
resumed by a tracee
- suspend2
Verify that the while the only thread within a process is
suspended, the whole process cannot be unstopped
Sponsored by <The NetBSD Foundation>
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Add new interface to add ability to get/set signal mask of a tracee.
It has been inspired by Linux PTRACE_GETSIGMASK and PTRACE_SETSIGMASK, but
adapted for NetBSD API.
This interface is used for checkpointing software to set/restore context
of a process including signal mask like criu or just to track this property
in reverse-execution software like Record and Replay Framework (rr).
Add new ATF tests for this interface
====================================
getsigmask1:
Verify that plain PT_SET_SIGMASK can be called
getsigmask2:
Verify that PT_SET_SIGMASK reports correct mask from tracee
setsigmask1:
Verify that plain PT_SET_SIGMASK can be called with empty mask
setsigmask2:
Verify that sigmask is preserved between PT_GET_SIGMASK and
PT_SET_SIGMASK
setsigmask3:
Verify that sigmask is preserved between PT_GET_SIGMASK, process
resumed and PT_SET_SIGMASK
setsigmask4:
Verify that new sigmask is visible in tracee
Kernel ABI bump delayed as there are more interfaces to come in ptrace(2).
Sponsored by <The NetBSD Foundation>
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Describe how to set piod_offs.
Sponsored by <The NetBSD Foundation>
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Import HISTORY notes from FreeBSD.
Sponsored by <The NetBSD Foundation>
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Sponsored by <The NetBSD Foundation>
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PTRACE_VFORK - report vfork(2)-like operations and trace child
PTRACE_VFORK_DONE - report unblocking the parent after vfork(2)-like call
Note that PTRACE_VFORK is currently unimplemented and returns ENOTSUP.
Sponsored by <The NetBSD Foundation>
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Document the current behavior of TRAP_CHILD in NetBSD.
Add more notes on PTRACE_FORK events.
Sponsored by <The NetBSD Foundation>
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Explain:
- execve(2) handling and behavior, SIGTRAP & TRAP_EXEC
- reference PaX MPROTECT restrictions for debuggers
- software breakpoints handling and behavior, SIGTRAP & TRAP_BKPT
- single step behavior, SIGTRAP & TRAP_TRACE
- list predefined MI symbols for help debuggers in port specific headers
- explain that PT_TRACE_ME does not send a SIGSTOP signal
Sponsored by <The NetBSD Foundation>
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PT_SET_SIGINFO - fake signal information emitted to tracee
PT_GET_SIGINFO - read signal information routed to tracee
Sponsored by <The NetBSD Foundation>
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Sponsored by <The NetBSD Foundation>
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The PT_GET_PROCESS_STATE call in ptrace(2) has the following usage of addr
and data:
A pointer to this structure is passed in addr. The data
argument should be set to sizeof(struct ptrace_event).
Sponsored by <The NetBSD Foundation>
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siginfo(2) describes appropriate signal specific information for SIGCHLD.
Sponsored by <The NetBSD Foundation>
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Sponsored by <The NetBSD Foundation>
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Sponsored by <The NetBSD Foundation>
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For example PT_READ_U/PT_WRITE_U has been removed by <mycroft> in 19950126.
Sponsored by <The NetBSD Foundation>
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Currently the PT_DUMPCORE call requires process to be stopped, therefore it
no longer need to warn about stoped tracee to generate consistent data.
Sponsored by <The NetBSD Foundation>
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This function is part of the general ptrace(2) interface.
Sponsored by <The NetBSD Foundation>
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These descriptions are imported from OpenBSD.
Approved by <christos>
Sponsored by <The NetBSD Foundation>
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