mirror of
https://github.com/SerenityOS/serenity
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113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, 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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* 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/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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#include <Kernel/VM/Region.h>
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#include <Kernel/VM/SharedInodeVMObject.h>
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namespace Kernel {
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int Process::sys$ptrace(const Syscall::SC_ptrace_params* user_params)
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{
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REQUIRE_PROMISE(proc);
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Syscall::SC_ptrace_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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auto result = Ptrace::handle_syscall(params, *this);
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return result.is_error() ? result.error() : result.value();
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}
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bool Process::has_tracee_thread(int tracer_pid) const
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{
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bool has_tracee = false;
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for_each_thread([&](Thread& t) {
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if (t.tracer() && t.tracer()->tracer_pid() == tracer_pid) {
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has_tracee = true;
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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return has_tracee;
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}
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KResultOr<u32> Process::peek_user_data(u32* address)
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{
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if (!MM.validate_user_read(*this, VirtualAddress(address), sizeof(u32))) {
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dbg() << "Invalid address for peek_user_data: " << address;
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return KResult(-EFAULT);
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}
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uint32_t result;
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// This function can be called from the context of another
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// process that called PT_PEEK
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ProcessPagingScope scope(*this);
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copy_from_user(&result, address);
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return result;
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}
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KResult Process::poke_user_data(u32* address, u32 data)
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{
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// We validate for read (rather than write) because PT_POKE can write to readonly pages.
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// So we effectively only care that the poke operation is trying to write to user pages.
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if (!MM.validate_user_read(*this, VirtualAddress(address), sizeof(u32))) {
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dbg() << "Invalid address for poke_user_data: " << address;
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return KResult(-EFAULT);
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}
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ProcessPagingScope scope(*this);
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Range range = { VirtualAddress(address), sizeof(u32) };
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auto* region = find_region_containing(range);
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ASSERT(region != nullptr);
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if (region->is_shared()) {
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// If the region is shared, we change its vmobject to a PrivateInodeVMObject
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// to prevent the write operation from chaning any shared inode data
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ASSERT(region->vmobject().is_shared_inode());
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region->set_vmobject(PrivateInodeVMObject::create_with_inode(static_cast<SharedInodeVMObject&>(region->vmobject()).inode()));
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region->set_shared(false);
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}
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const bool was_writable = region->is_writable();
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if (!was_writable) //TODO refactor into scopeguard
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{
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region->set_writable(true);
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region->remap();
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}
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copy_to_user(address, &data);
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if (!was_writable) {
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region->set_writable(false);
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region->remap();
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}
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return KResult(KSuccess);
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}
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}
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