[kernel-hardening] Re: [PATCH v7 2/2] security: tty: make TIOCSTI ioctl require CAP_SYS_ADMIN

[Nick Kralevich]

On Fri, Jun 2, 2017 at 1:05 PM, Alan Cox <gnomes at lxorguk.ukuu.org.uk> wrote:
> So I'd say it's all the generic tty ioctls except TIOCSTI and TIOCSETD
> but it would be good to see what Android is going with and why.

Android limits tty ioctls to the following whitelist:
  TIOCOUTQ
  FIOCLEX
  TCGETS
  TCSETS
  TIOCGWINSZ
  TIOCSWINSZ
  TIOCSCTTY
  TCSETSW
  TCFLSH
  TIOCSPGRP
  TIOCGPGRP

See unpriv_tty_ioctls at
https://android.googlesource.com/platform/system/sepolicy/+/34b4b73729b288b4109b2225c1445eb58393b8cb/public/ioctl_macros#51


-- 
Nick Kralevich | Android Security | nnk at google.com | 650.214.4037
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