linux-kernel - Re: [syzbot] Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked

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Message-ID: <685505ac.a00a0220.137b3.0035.GAE@google.com>
Date: Thu, 19 Jun 2025 23:54:36 -0700
From: syzbot <syzbot+9b9124ae9b12d5af5d95@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in
 vmci_host_unlocked_ioctl (3)

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Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl (3)
Author: lizhi.xu@...driver.com

#syz test

diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c
index b64944367ac5..e67e6ae48e83 100644
--- a/drivers/misc/vmw_vmci/vmci_host.c
+++ b/drivers/misc/vmw_vmci/vmci_host.c
@@ -398,6 +398,7 @@ static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
 		kfree(dg);
 		return -EINVAL;
 	}
+	memset((char*)dg + 27, 0, 4);
 
 	pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
 		 dg->dst.context, dg->dst.resource,