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vt: prevent kernel-infoleak in con_font_get()

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commit f956052e00 upstream.

font.data may not initialize all memory spaces depending on the implementation
of vc->vc_sw->con_font_get. This may cause info-leak, so to prevent this, it
is safest to modify it to initialize the allocated memory space to 0, and it
generally does not affect the overall performance of the system.

Cc: stable@vger.kernel.org
Reported-by: syzbot+955da2d57931604ee691@syzkaller.appspotmail.com
Fixes: 05e2600cb0 ("VT: Bump font size limitation to 64x128 pixels")
Signed-off-by: Jeongjun Park <aha310510@gmail.com>
Link: https://lore.kernel.org/r/20241010174619.59662-1-aha310510@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeongjun Park 2024-10-11 02:46:19 +09:00 committed by Greg Kroah-Hartman
parent 885f8c873f
commit dc2d5f0263
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/vt/vt.c
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@ -4550,7 +4550,7 @@ static int con_font_get(struct vc_data *vc, struct console_font_op *op)
return -EINVAL;
if (op->data) {
font.data = kvmalloc(max_font_size, GFP_KERNEL);
font.data = kvzalloc(max_font_size, GFP_KERNEL);
if (!font.data)
return -ENOMEM;
} else