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| author | Jeongjun Park <aha310510@gmail.com> | 2024-10-10 19:46:19 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-11 08:27:36 +0200 |
| commit | f956052e00de211b5c9ebaa1958366c23f82ee9e (patch) | |
| tree | 9c78fea51fb9e1d2ecf0c6401d37c1bd95773e90 | |
| parent | Linux 6.12-rc2 (diff) | |
| download | linux-f956052e00de211b5c9ebaa1958366c23f82ee9e.tar.xz linux-f956052e00de211b5c9ebaa1958366c23f82ee9e.zip | |
vt: prevent kernel-infoleak in con_font_get()
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: 05e2600cb0a4 ("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>
| -rw-r--r-- | drivers/tty/vt/vt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index cd87e3d1291e..96842ce817af 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -4726,7 +4726,7 @@ 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 |