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| author | Nicolas Lacasse <nlacasse@google.com> | 2019-02-14 15:46:25 -0800 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2019-02-14 15:47:31 -0800 |
| commit | 0a41ea72c1f70916bdbb68d9fdfa6c438e28b5b2 (patch) | |
| tree | ce2fdd6bb92036481ea2a44fb091b355b9bfae77 /pkg/sentry/fs/sys | |
| parent | d60ce17a21a28ab32607b195ae42692442322ff8 (diff) | |
Don't allow writing or reading to TTY unless process group is in foreground.
If a background process tries to read from a TTY, linux sends it a SIGTTIN
unless the signal is blocked or ignored, or the process group is an orphan, in
which case the syscall returns EIO.
See drivers/tty/n_tty.c:n_tty_read()=>job_control().
If a background process tries to write a TTY, set the termios, or set the
foreground process group, linux then sends a SIGTTOU. If the signal is ignored
or blocked, linux allows the write. If the process group is an orphan, the
syscall returns EIO.
See drivers/tty/tty_io.c:tty_check_change().
PiperOrigin-RevId: 234044367
Change-Id: I009461352ac4f3f11c5d42c43ac36bb0caa580f9
Diffstat (limited to 'pkg/sentry/fs/sys')
0 files changed, 0 insertions, 0 deletions