| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 35/49] vt_ioctl: add array_index_nospec to VT_ACTIVATE | Date | Mon, 14 Feb 2022 10:26:01 +0100 |
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From: Jakob Koschel <jakobkoschel@gmail.com>
commit 28cb138f559f8c1a1395f5564f86b8bbee83631b upstream.
in vt_setactivate an almost identical code path has been patched with array_index_nospec. In the VT_ACTIVATE path the user input is from a system call argument instead of a usercopy. For consistency both code paths should have the same mitigations applied.
Kasper Acknowledgements: Jakob Koschel, Brian Johannesmeyer, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida from the VUSec group at VU Amsterdam.
Co-developed-by: Brian Johannesmeyer <bjohannesmeyer@gmail.com> Signed-off-by: Brian Johannesmeyer <bjohannesmeyer@gmail.com> Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com> Link: https://lore.kernel.org/r/20220127144406.3589293-2-jakobkoschel@gmail.com Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/tty/vt/vt_ioctl.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -691,6 +691,7 @@ int vt_ioctl(struct tty_struct *tty, ret = -ENXIO; else { arg--; + arg = array_index_nospec(arg, MAX_NR_CONSOLES); console_lock(); ret = vc_allocate(arg); console_unlock();
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