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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>
This commit is contained in:
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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2
drivers/tty/vt/vt_ioctl.c
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@ -596,6 +596,8 @@ static int vt_setactivate(struct vt_setactivate __user *sa)
return -EFAULT;
if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
return -ENXIO;
if (vsa.mode.mode != VT_AUTO && vsa.mode.mode != VT_PROCESS)
return -EINVAL;
vsa.console--;
vsa.console = array_index_nospec(vsa.console, MAX_NR_CONSOLES);