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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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27
Kernel/Process.cpp
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@ -22,6 +22,7 @@
#include <Kernel/ELF/exec_elf.h>
#include <AK/StringBuilder.h>
#include <Kernel/SharedMemory.h>
#include <Kernel/ProcessTracer.h>
//#define DEBUG_IO
//#define TASK_DEBUG
@ -1894,6 +1895,9 @@ void Process::finalize()
void Process::die()
{
if (m_tracer)
m_tracer->set_dead();
{
InterruptDisabler disabler;
for_each_thread([] (Thread& thread) {
@ -2482,3 +2486,26 @@ int Process::sys$ftruncate(int fd, off_t length)
return -EINVAL;
return descriptor->truncate(length);
}
int Process::sys$systrace(pid_t pid)
{
InterruptDisabler disabler;
auto* peer = Process::from_pid(pid);
if (!peer)
return -ESRCH;
if (peer->uid() != m_euid)
return -EACCES;
int fd = alloc_fd();
if (fd < 0)
return fd;
auto descriptor = FileDescriptor::create(peer->ensure_tracer());
m_fds[fd].set(move(descriptor), 0);
return fd;
}
ProcessTracer& Process::ensure_tracer()
{
if (!m_tracer)
m_tracer = ProcessTracer::create(m_pid);
return *m_tracer;
}