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Kernel: Add a systrace() syscall and implement /bin/strace using it.

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Calling systrace(pid) gives you a file descriptor with a stream of the
syscalls made by a peer process. The process must be owned by the same
UID who calls systrace(). :^)
This commit is contained in:
Andreas Kling 2019-04-22 18:44:45 +02:00
parent 6693cfb26a
commit 5c68929aa1
12 changed files with 188 additions and 1 deletions
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25
Kernel/FileSystem/FileDescriptor.cpp
View file

@ -12,6 +12,7 @@
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/SharedMemory.h>
#include <Kernel/ProcessTracer.h>
Retained<FileDescriptor> FileDescriptor::create(RetainPtr<Inode>&& inode)
{
@ -23,6 +24,11 @@ Retained<FileDescriptor> FileDescriptor::create(RetainPtr<Device>&& device)
return adopt(*new FileDescriptor(move(device)));
}
Retained<FileDescriptor> FileDescriptor::create(RetainPtr<ProcessTracer>&& tracer)
{
return adopt(*new FileDescriptor(move(tracer)));
}
Retained<FileDescriptor> FileDescriptor::create(RetainPtr<SharedMemory>&& shared_memory)
{
return adopt(*new FileDescriptor(move(shared_memory)));
@ -53,6 +59,11 @@ FileDescriptor::FileDescriptor(RetainPtr<Device>&& device)
{
}
FileDescriptor::FileDescriptor(RetainPtr<ProcessTracer>&& tracer)
: m_tracer(move(tracer))
{
}
FileDescriptor::FileDescriptor(RetainPtr<SharedMemory>&& shared_memory)
: m_shared_memory(move(shared_memory))
{
@ -199,6 +210,8 @@ off_t FileDescriptor::seek(off_t offset, int whence)
ssize_t FileDescriptor::read(Process& process, byte* buffer, ssize_t count)
{
if (m_tracer)
return m_tracer->read(buffer, count);
if (is_fifo()) {
ASSERT(fifo_direction() == FIFO::Reader);
return m_fifo->read(buffer, count);
@ -217,6 +230,10 @@ ssize_t FileDescriptor::read(Process& process, byte* buffer, ssize_t count)
ssize_t FileDescriptor::write(Process& process, const byte* data, ssize_t size)
{
if (m_tracer) {
// FIXME: Figure out what the right error code would be.
return -EIO;
}
if (is_fifo()) {
ASSERT(fifo_direction() == FIFO::Writer);
return m_fifo->write(data, size);
@ -235,6 +252,8 @@ ssize_t FileDescriptor::write(Process& process, const byte* data, ssize_t size)
bool FileDescriptor::can_write(Process& process)
{
if (m_tracer)
return true;
if (is_fifo()) {
ASSERT(fifo_direction() == FIFO::Writer);
return m_fifo->can_write();
@ -248,6 +267,8 @@ bool FileDescriptor::can_write(Process& process)
bool FileDescriptor::can_read(Process& process)
{
if (m_tracer)
return m_tracer->can_read();
if (is_fifo()) {
ASSERT(fifo_direction() == FIFO::Reader);
return m_fifo->can_read();
@ -376,6 +397,8 @@ bool FileDescriptor::is_file() const
KResultOr<String> FileDescriptor::absolute_path()
{
Stopwatch sw("absolute_path");
if (m_tracer)
return String::format("tracer:%d", m_tracer->pid());
if (is_tty())
return tty()->tty_name();
if (is_fifo())
@ -405,6 +428,8 @@ InodeMetadata FileDescriptor::metadata() const
bool FileDescriptor::supports_mmap() const
{
if (m_tracer)
return false;
if (m_inode)
return true;
if (m_shared_memory)