mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 22:07:35 +00:00
Kernel: Reorganize ptrace implementation a bit
The generic parts of ptrace now live in Kernel/Syscalls/ptrace.cpp and the i386 specific parts are moved to Arch/i386/CPU.cpp
This commit is contained in:
parent
45231051e6
commit
f39c2b653e
8 changed files with 169 additions and 246 deletions
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@ -2264,6 +2264,40 @@ void Processor::set_thread_specific(u8* data, size_t len)
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descriptor.set_limit(len);
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}
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void copy_kernel_registers_into_ptrace_registers(PtraceRegisters& ptrace_regs, const RegisterState& kernel_regs)
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{
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ptrace_regs.eax = kernel_regs.eax,
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ptrace_regs.ecx = kernel_regs.ecx,
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ptrace_regs.edx = kernel_regs.edx,
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ptrace_regs.ebx = kernel_regs.ebx,
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ptrace_regs.esp = kernel_regs.userspace_esp,
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ptrace_regs.ebp = kernel_regs.ebp,
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ptrace_regs.esi = kernel_regs.esi,
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ptrace_regs.edi = kernel_regs.edi,
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ptrace_regs.eip = kernel_regs.eip,
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ptrace_regs.eflags = kernel_regs.eflags,
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ptrace_regs.cs = 0;
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ptrace_regs.ss = 0;
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ptrace_regs.ds = 0;
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ptrace_regs.es = 0;
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ptrace_regs.fs = 0;
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ptrace_regs.gs = 0;
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}
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void copy_ptrace_registers_into_kernel_registers(RegisterState& kernel_regs, const PtraceRegisters& ptrace_regs)
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{
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kernel_regs.eax = ptrace_regs.eax;
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kernel_regs.ecx = ptrace_regs.ecx;
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kernel_regs.edx = ptrace_regs.edx;
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kernel_regs.ebx = ptrace_regs.ebx;
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kernel_regs.esp = ptrace_regs.esp;
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kernel_regs.ebp = ptrace_regs.ebp;
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kernel_regs.esi = ptrace_regs.esi;
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kernel_regs.edi = ptrace_regs.edi;
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kernel_regs.eip = ptrace_regs.eip;
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kernel_regs.eflags = (kernel_regs.eflags & ~safe_eflags_mask) | (ptrace_regs.eflags & safe_eflags_mask);
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}
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}
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#ifdef DEBUG
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -32,6 +32,7 @@
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#include <AK/Vector.h>
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#include <Kernel/PhysicalAddress.h>
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#include <Kernel/VirtualAddress.h>
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#include <LibC/sys/arch/i386/regs.h>
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#define PAGE_SIZE 4096
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#define GENERIC_INTERRUPT_HANDLERS_COUNT (256 - IRQ_VECTOR_BASE)
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@ -494,6 +495,9 @@ struct [[gnu::packed]] RegisterState {
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#define REGISTER_STATE_SIZE (19 * 4)
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static_assert(REGISTER_STATE_SIZE == sizeof(RegisterState));
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void copy_kernel_registers_into_ptrace_registers(PtraceRegisters&, const RegisterState&);
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void copy_ptrace_registers_into_kernel_registers(RegisterState&, const PtraceRegisters&);
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struct [[gnu::aligned(16)]] FPUState
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{
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u8 buffer[512];
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@ -104,7 +104,6 @@ set(KERNEL_SOURCES
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PerformanceEventBuffer.cpp
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Process.cpp
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ProcessGroup.cpp
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Ptrace.cpp
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RTC.cpp
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Random.cpp
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Scheduler.cpp
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@ -34,7 +34,6 @@
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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#include <Kernel/Ptrace.h>
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#include <Kernel/RTC.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/VM/ProcessPagingScope.h>
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@ -246,7 +245,7 @@ ByteBuffer CoreDump::create_notes_threads_data() const
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ELF::Core::ThreadInfo info {};
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info.header.type = ELF::Core::NotesEntryHeader::Type::ThreadInfo;
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info.tid = thread.tid().value();
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Ptrace::copy_kernel_registers_into_ptrace_registers(info.regs, thread.get_register_dump_from_stack());
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copy_kernel_registers_into_ptrace_registers(info.regs, thread.get_register_dump_from_stack());
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entry_buff.append((void*)&info, sizeof(info));
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@ -1,194 +0,0 @@
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/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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#include <Kernel/Ptrace.h>
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#include <Kernel/Thread.h>
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#include <Kernel/ThreadTracer.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/ProcessPagingScope.h>
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namespace Ptrace {
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KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, Process& caller)
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{
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ScopedSpinLock scheduler_lock(g_scheduler_lock);
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if (params.request == PT_TRACE_ME) {
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if (Process::current()->tracer())
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return EBUSY;
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caller.set_wait_for_tracer_at_next_execve(true);
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return KSuccess;
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}
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// FIXME: PID/TID BUG
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// This bug allows to request PT_ATTACH (or anything else) the same process, as
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// long it is not the main thread. Alternatively, if this is desired, then the
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// bug is that this prevents PT_ATTACH to the main thread from another thread.
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if (params.tid == caller.pid().value())
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return EINVAL;
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auto peer = Thread::from_tid(params.tid);
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if (!peer)
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return ESRCH;
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if ((peer->process().uid() != caller.euid())
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|| (peer->process().uid() != peer->process().euid())) // Disallow tracing setuid processes
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return EACCES;
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if (!peer->process().is_dumpable())
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return EACCES;
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auto& peer_process = peer->process();
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if (params.request == PT_ATTACH) {
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if (peer_process.tracer()) {
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return EBUSY;
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}
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peer_process.start_tracing_from(caller.pid());
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ScopedSpinLock lock(peer->get_lock());
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if (peer->state() != Thread::State::Stopped) {
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peer->send_signal(SIGSTOP, &caller);
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}
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return KSuccess;
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}
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auto* tracer = peer_process.tracer();
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if (!tracer)
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return EPERM;
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if (tracer->tracer_pid() != caller.pid())
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return EBUSY;
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if (peer->state() == Thread::State::Running)
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return EBUSY;
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scheduler_lock.unlock();
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switch (params.request) {
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case PT_CONTINUE:
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peer->send_signal(SIGCONT, &caller);
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break;
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case PT_DETACH:
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peer_process.stop_tracing();
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peer->send_signal(SIGCONT, &caller);
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break;
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case PT_SYSCALL:
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tracer->set_trace_syscalls(true);
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peer->send_signal(SIGCONT, &caller);
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break;
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case PT_GETREGS: {
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if (!tracer->has_regs())
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return EINVAL;
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auto* regs = reinterpret_cast<PtraceRegisters*>(params.addr);
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if (!copy_to_user(regs, &tracer->regs()))
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return EFAULT;
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break;
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}
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case PT_SETREGS: {
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if (!tracer->has_regs())
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return EINVAL;
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PtraceRegisters regs;
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if (!copy_from_user(®s, (const PtraceRegisters*)params.addr))
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return EFAULT;
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auto& peer_saved_registers = peer->get_register_dump_from_stack();
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// Verify that the saved registers are in usermode context
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if ((peer_saved_registers.cs & 0x03) != 3)
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return EFAULT;
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tracer->set_regs(regs);
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copy_ptrace_registers_into_kernel_registers(peer_saved_registers, regs);
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break;
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}
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case PT_PEEK: {
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Kernel::Syscall::SC_ptrace_peek_params peek_params;
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if (!copy_from_user(&peek_params, reinterpret_cast<Kernel::Syscall::SC_ptrace_peek_params*>(params.addr)))
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return EFAULT;
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if (!is_user_address(VirtualAddress { peek_params.address }))
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return EFAULT;
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auto result = peer->process().peek_user_data(Userspace<const u32*> { (FlatPtr)peek_params.address });
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if (result.is_error())
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return result.error();
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if (!copy_to_user(peek_params.out_data, &result.value()))
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return EFAULT;
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break;
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}
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case PT_POKE:
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if (!is_user_address(VirtualAddress { params.addr }))
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return EFAULT;
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return peer->process().poke_user_data(Userspace<u32*> { (FlatPtr)params.addr }, params.data);
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default:
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return EINVAL;
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}
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return KSuccess;
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}
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void copy_kernel_registers_into_ptrace_registers(PtraceRegisters& ptrace_regs, const RegisterState& kernel_regs)
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{
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ptrace_regs.eax = kernel_regs.eax,
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ptrace_regs.ecx = kernel_regs.ecx,
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ptrace_regs.edx = kernel_regs.edx,
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ptrace_regs.ebx = kernel_regs.ebx,
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ptrace_regs.esp = kernel_regs.userspace_esp,
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ptrace_regs.ebp = kernel_regs.ebp,
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ptrace_regs.esi = kernel_regs.esi,
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ptrace_regs.edi = kernel_regs.edi,
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ptrace_regs.eip = kernel_regs.eip,
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ptrace_regs.eflags = kernel_regs.eflags,
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ptrace_regs.cs = 0;
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ptrace_regs.ss = 0;
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ptrace_regs.ds = 0;
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ptrace_regs.es = 0;
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ptrace_regs.fs = 0;
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ptrace_regs.gs = 0;
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}
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void copy_ptrace_registers_into_kernel_registers(RegisterState& kernel_regs, const PtraceRegisters& ptrace_regs)
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{
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kernel_regs.eax = ptrace_regs.eax;
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kernel_regs.ecx = ptrace_regs.ecx;
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kernel_regs.edx = ptrace_regs.edx;
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kernel_regs.ebx = ptrace_regs.ebx;
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kernel_regs.esp = ptrace_regs.esp;
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kernel_regs.ebp = ptrace_regs.ebp;
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kernel_regs.esi = ptrace_regs.esi;
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kernel_regs.edi = ptrace_regs.edi;
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kernel_regs.eip = ptrace_regs.eip;
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kernel_regs.eflags = (kernel_regs.eflags & ~safe_eflags_mask) | (ptrace_regs.eflags & safe_eflags_mask);
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}
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}
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@ -1,41 +0,0 @@
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/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <Kernel/API/Syscall.h>
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#include <Kernel/KResult.h>
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#include <Kernel/Process.h>
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#include <LibC/sys/arch/i386/regs.h>
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namespace Ptrace {
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KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, Process& caller);
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void copy_kernel_registers_into_ptrace_registers(PtraceRegisters&, const RegisterState&);
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void copy_ptrace_registers_into_kernel_registers(RegisterState&, const PtraceRegisters&);
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}
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -26,7 +27,6 @@
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#include <AK/ScopeGuard.h>
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#include <Kernel/Process.h>
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#include <Kernel/Ptrace.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PrivateInodeVMObject.h>
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#include <Kernel/VM/ProcessPagingScope.h>
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@ -35,13 +35,136 @@
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namespace Kernel {
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static KResultOr<u32> handle_ptrace(const Kernel::Syscall::SC_ptrace_params& params, Process& caller)
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{
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ScopedSpinLock scheduler_lock(g_scheduler_lock);
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if (params.request == PT_TRACE_ME) {
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if (Process::current()->tracer())
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return EBUSY;
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caller.set_wait_for_tracer_at_next_execve(true);
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return KSuccess;
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}
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// FIXME: PID/TID BUG
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// This bug allows to request PT_ATTACH (or anything else) the same process, as
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// long it is not the main thread. Alternatively, if this is desired, then the
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// bug is that this prevents PT_ATTACH to the main thread from another thread.
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if (params.tid == caller.pid().value())
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return EINVAL;
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auto peer = Thread::from_tid(params.tid);
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if (!peer)
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return ESRCH;
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if ((peer->process().uid() != caller.euid())
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|| (peer->process().uid() != peer->process().euid())) // Disallow tracing setuid processes
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return EACCES;
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if (!peer->process().is_dumpable())
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return EACCES;
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auto& peer_process = peer->process();
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if (params.request == PT_ATTACH) {
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if (peer_process.tracer()) {
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return EBUSY;
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}
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peer_process.start_tracing_from(caller.pid());
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ScopedSpinLock lock(peer->get_lock());
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if (peer->state() != Thread::State::Stopped) {
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peer->send_signal(SIGSTOP, &caller);
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}
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return KSuccess;
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}
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auto* tracer = peer_process.tracer();
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if (!tracer)
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return EPERM;
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if (tracer->tracer_pid() != caller.pid())
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return EBUSY;
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if (peer->state() == Thread::State::Running)
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return EBUSY;
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scheduler_lock.unlock();
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switch (params.request) {
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case PT_CONTINUE:
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peer->send_signal(SIGCONT, &caller);
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break;
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case PT_DETACH:
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peer_process.stop_tracing();
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peer->send_signal(SIGCONT, &caller);
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break;
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case PT_SYSCALL:
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tracer->set_trace_syscalls(true);
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peer->send_signal(SIGCONT, &caller);
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break;
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case PT_GETREGS: {
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if (!tracer->has_regs())
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return EINVAL;
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auto* regs = reinterpret_cast<PtraceRegisters*>(params.addr);
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if (!copy_to_user(regs, &tracer->regs()))
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return EFAULT;
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break;
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}
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case PT_SETREGS: {
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if (!tracer->has_regs())
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return EINVAL;
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PtraceRegisters regs {};
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if (!copy_from_user(®s, (const PtraceRegisters*)params.addr))
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return EFAULT;
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auto& peer_saved_registers = peer->get_register_dump_from_stack();
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// Verify that the saved registers are in usermode context
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if ((peer_saved_registers.cs & 0x03) != 3)
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return EFAULT;
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tracer->set_regs(regs);
|
||||
copy_ptrace_registers_into_kernel_registers(peer_saved_registers, regs);
|
||||
break;
|
||||
}
|
||||
|
||||
case PT_PEEK: {
|
||||
Kernel::Syscall::SC_ptrace_peek_params peek_params {};
|
||||
if (!copy_from_user(&peek_params, reinterpret_cast<Kernel::Syscall::SC_ptrace_peek_params*>(params.addr)))
|
||||
return EFAULT;
|
||||
if (!is_user_address(VirtualAddress { peek_params.address }))
|
||||
return EFAULT;
|
||||
auto result = peer->process().peek_user_data(Userspace<const u32*> { (FlatPtr)peek_params.address });
|
||||
if (result.is_error())
|
||||
return result.error();
|
||||
if (!copy_to_user(peek_params.out_data, &result.value()))
|
||||
return EFAULT;
|
||||
break;
|
||||
}
|
||||
|
||||
case PT_POKE:
|
||||
if (!is_user_address(VirtualAddress { params.addr }))
|
||||
return EFAULT;
|
||||
return peer->process().poke_user_data(Userspace<u32*> { (FlatPtr)params.addr }, params.data);
|
||||
|
||||
default:
|
||||
return EINVAL;
|
||||
}
|
||||
|
||||
return KSuccess;
|
||||
}
|
||||
|
||||
int Process::sys$ptrace(Userspace<const Syscall::SC_ptrace_params*> user_params)
|
||||
{
|
||||
REQUIRE_PROMISE(ptrace);
|
||||
Syscall::SC_ptrace_params params;
|
||||
Syscall::SC_ptrace_params params {};
|
||||
if (!copy_from_user(¶ms, user_params))
|
||||
return -EFAULT;
|
||||
auto result = Ptrace::handle_syscall(params, *this);
|
||||
auto result = handle_ptrace(params, *this);
|
||||
return result.is_error() ? result.error().error() : result.value();
|
||||
}
|
||||
|
||||
|
|
|
@ -27,7 +27,6 @@
|
|||
#include <AK/Memory.h>
|
||||
#include <AK/kmalloc.h>
|
||||
#include <Kernel/Arch/i386/CPU.h>
|
||||
#include <Kernel/Ptrace.h>
|
||||
#include <Kernel/ThreadTracer.h>
|
||||
|
||||
namespace Kernel {
|
||||
|
@ -39,8 +38,8 @@ ThreadTracer::ThreadTracer(ProcessID tracer_pid)
|
|||
|
||||
void ThreadTracer::set_regs(const RegisterState& regs)
|
||||
{
|
||||
PtraceRegisters r;
|
||||
Ptrace::copy_kernel_registers_into_ptrace_registers(r, regs);
|
||||
PtraceRegisters r {};
|
||||
copy_kernel_registers_into_ptrace_registers(r, regs);
|
||||
m_regs = r;
|
||||
}
|
||||
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue