vt: add mode validation in vt_setactivate

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The vt_setactivate() function accepts any mode value without validation,
while VT_SETMODE correctly rejects invalid values (only VT_AUTO and
VT_PROCESS are valid).

This allows users to set invalid mode values (e.g., 0xFF) which bypasses
VT_PROCESS signal handling and causes undefined VT switching behavior.

Fix this by adding the same validation as VT_SETMODE.

Signed-off-by: Wang Zihan <jiyu03@qq.com>
Link: https://patch.msgid.link/tencent_6A7DAE2E1288663D23AACBE2950D6E535007@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Wang Zihan 2026-05-03 03:46:15 +08:00 • committed by Greg Kroah-Hartman

parent 8200871327

commit e62745dd11

1 changed files with 2 additions and 0 deletions

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drivers/tty/vt/vt_ioctl.c

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