From: Jeongjun Park aha310510@gmail.com

stable inclusion from stable-v6.6.58 commit dc2d5f02636c7587bdd6d1f60fc59c55860b00a4 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB0ENE CVE: CVE-2024-50076

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit f956052e00de211b5c9ebaa1958366c23f82ee9e 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: 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 Signed-off-by: Gu Bowen gubowen5@huawei.com --- drivers/tty/vt/vt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index a22da757ca6d..6bd1a7785e88 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -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