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Kernel: Store TTY's foreground process as a WeakPtr<Process>

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This ensures that we don't leave a stale PGID assigned to the TTY after
the process exits, which would make PID recycling attacks possible.
This commit is contained in:
Andreas Kling 2020-08-06 11:17:53 +02:00
parent ff01cfa08a
commit ddab7ab693
3 changed files with 22 additions and 12 deletions
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8
Kernel/TTY/TTY.h
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@ -27,14 +27,13 @@
#pragma once
#include <AK/CircularDeque.h>
#include <AK/WeakPtr.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/DoubleBuffer.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class Process;
class TTY : public CharacterDevice {
public:
virtual ~TTY() override;
@ -51,8 +50,7 @@ public:
unsigned short rows() const { return m_rows; }
unsigned short columns() const { return m_columns; }
void set_pgid(pid_t pgid) { m_pgid = pgid; }
pid_t pgid() const { return m_pgid; }
pid_t pgid() const;
void set_termios(const termios&);
bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
@ -93,7 +91,7 @@ private:
virtual bool is_tty() const final override { return true; }
CircularDeque<u8, 1024> m_input_buffer;
pid_t m_pgid { 0 };
WeakPtr<Process> m_process;
termios m_termios;
unsigned short m_rows { 0 };
unsigned short m_columns { 0 };