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vt_ioctl: add array_index_nospec to VT_ACTIVATE

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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>
This commit is contained in:
Jakob Koschel 2022-01-27 15:44:05 +01:00 committed by Greg Kroah-Hartman
parent ae3d574115
commit 0e31f914d7
1 changed files with 1 additions and 0 deletions
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drivers/tty/vt/vt_ioctl.c
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@ -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();