mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-13 11:42:38 +03:00
113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <Kernel/Process.h>
|
|
#include <Kernel/Ptrace.h>
|
|
#include <Kernel/VM/MemoryManager.h>
|
|
#include <Kernel/VM/PrivateInodeVMObject.h>
|
|
#include <Kernel/VM/ProcessPagingScope.h>
|
|
#include <Kernel/VM/Region.h>
|
|
#include <Kernel/VM/SharedInodeVMObject.h>
|
|
|
|
namespace Kernel {
|
|
|
|
int Process::sys$ptrace(Userspace<const Syscall::SC_ptrace_params*> user_params)
|
|
{
|
|
REQUIRE_PROMISE(proc);
|
|
Syscall::SC_ptrace_params params;
|
|
if (!validate_read_and_copy_typed(¶ms, user_params))
|
|
return -EFAULT;
|
|
auto result = Ptrace::handle_syscall(params, *this);
|
|
return result.is_error() ? result.error() : result.value();
|
|
}
|
|
|
|
bool Process::has_tracee_thread(int tracer_pid) const
|
|
{
|
|
bool has_tracee = false;
|
|
|
|
for_each_thread([&](Thread& t) {
|
|
if (t.tracer() && t.tracer()->tracer_pid() == tracer_pid) {
|
|
has_tracee = true;
|
|
return IterationDecision::Break;
|
|
}
|
|
return IterationDecision::Continue;
|
|
});
|
|
return has_tracee;
|
|
}
|
|
|
|
KResultOr<u32> Process::peek_user_data(Userspace<const u32*> address)
|
|
{
|
|
if (!MM.validate_user_read(*this, VirtualAddress(address), sizeof(u32))) {
|
|
dbg() << "Invalid address for peek_user_data: " << address.ptr();
|
|
return KResult(-EFAULT);
|
|
}
|
|
uint32_t result;
|
|
|
|
// This function can be called from the context of another
|
|
// process that called PT_PEEK
|
|
ProcessPagingScope scope(*this);
|
|
copy_from_user(&result, address);
|
|
|
|
return result;
|
|
}
|
|
|
|
KResult Process::poke_user_data(Userspace<u32*> address, u32 data)
|
|
{
|
|
// We validate for read (rather than write) because PT_POKE can write to readonly pages.
|
|
// So we effectively only care that the poke operation is trying to write to user pages.
|
|
if (!MM.validate_user_read(*this, VirtualAddress(address), sizeof(u32))) {
|
|
dbg() << "Invalid address for poke_user_data: " << address.ptr();
|
|
return KResult(-EFAULT);
|
|
}
|
|
ProcessPagingScope scope(*this);
|
|
Range range = { VirtualAddress(address), sizeof(u32) };
|
|
auto* region = find_region_containing(range);
|
|
ASSERT(region != nullptr);
|
|
if (region->is_shared()) {
|
|
// If the region is shared, we change its vmobject to a PrivateInodeVMObject
|
|
// to prevent the write operation from changing any shared inode data
|
|
ASSERT(region->vmobject().is_shared_inode());
|
|
region->set_vmobject(PrivateInodeVMObject::create_with_inode(static_cast<SharedInodeVMObject&>(region->vmobject()).inode()));
|
|
region->set_shared(false);
|
|
}
|
|
const bool was_writable = region->is_writable();
|
|
if (!was_writable) //TODO refactor into scopeguard
|
|
{
|
|
region->set_writable(true);
|
|
region->remap();
|
|
}
|
|
|
|
copy_to_user(address, &data);
|
|
|
|
if (!was_writable) {
|
|
region->set_writable(false);
|
|
region->remap();
|
|
}
|
|
return KResult(KSuccess);
|
|
}
|
|
|
|
}
|