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Copy pathCorpseProcess.cpp
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110 lines (95 loc) · 3.93 KB
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/*
* Copyright (C) 2026 Apple Inc. 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "CorpseProcess.h"
#if (OS(MACOS) || USE(APPLE_INTERNAL_SDK)) && !PLATFORM(MACCATALYST) && !PLATFORM(IOS_FAMILY_SIMULATOR)
#include "CorpseError.h"
#include <errno.h>
#include <mach/mach.h>
#include <mach/mach_error.h>
#include <mach/mach_traps.h>
#include <signal.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
namespace Corpse {
// A task port name outlives the task it named: when the target exits, the right we
// hold becomes a dead name while the name itself is unchanged. MACH_PORT_VALID only
// looks at the name, so it keeps reporting the port as good. Asking the kernel which
// pid the port names is what tells a still-attached process apart from one that has
// since exited -- and, because the answer is compared against m_pid, from a later
// process that inherited the same pid.
bool Process::holdsLiveTask() const
{
if (!MACH_PORT_VALID(m_taskPort))
return false;
int pid = -1;
return pid_for_task(m_taskPort, &pid) == KERN_SUCCESS && pid == m_pid;
}
bool Process::isTranslated() const
{
struct kinfo_proc info;
size_t length = sizeof info;
int selector[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, m_pid };
// A pid that no longer exists is not an error here: sysctl succeeds and reports
// that it wrote nothing, so the size has to be checked rather than the result.
if (sysctl(selector, 4, &info, &length, nullptr, 0) || length < sizeof info)
return false;
return info.kp_proc.p_flag & P_TRANSLATED;
}
bool Process::attach()
{
if (isAttached()) {
if (holdsLiveTask())
return true;
// The target exited while we held its port.
detach();
}
mach_port_t taskPort = MACH_PORT_NULL;
kern_return_t kr = task_for_pid(mach_task_self(), m_pid, &taskPort);
if (kr == KERN_SUCCESS) {
m_taskPort = taskPort;
return true;
}
if (kill(m_pid, 0) && errno == ESRCH)
Error::report("No process with PID %d", static_cast<int>(m_pid));
else {
Error::report("Could not attach to PID %u: %s (0x%x) -- may need to run as root "
"or add the appropriate debugger entitlement",
static_cast<unsigned>(m_pid), mach_error_string(kr), kr);
}
return false;
}
void Process::detach()
{
if (MACH_PORT_VALID(m_taskPort))
mach_port_deallocate(mach_task_self(), m_taskPort);
m_taskPort = MACH_PORT_NULL;
}
} // namespace Corpse
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // (OS(MACOS) || USE(APPLE_INTERNAL_SDK)) && !PLATFORM(MACCATALYST) && !PLATFORM(IOS_FAMILY_SIMULATOR)