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

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Message-ID: <20250622062844.1505-1-hdanton@sina.com>
Date: Sun, 22 Jun 2025 14:28:43 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+9b9124ae9b12d5af5d95@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl (3)

On Thu, 19 Jun 2025 16:57:26 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    08215f5486ec Merge tag 'kbuild-fixes-v6.16' of git://git.k..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=13f7fd70580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61539536677af51c
> dashboard link: https://syzkaller.appspot.com/bug?extid=9b9124ae9b12d5af5d95
> compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17f7fd70580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1485690c580000

#syz test

--- x/drivers/misc/vmw_vmci/vmci_context.c
+++ y/drivers/misc/vmw_vmci/vmci_context.c
@@ -245,7 +245,7 @@ static int ctx_fire_notification(u32 con
 	array_size = vmci_handle_arr_get_size(subscriber_array);
 	for (i = 0; i < array_size; i++) {
 		int result;
-		struct vmci_event_ctx ev;
+		struct vmci_event_ctx ev = {0};
 
 		ev.msg.hdr.dst = vmci_handle_arr_get_entry(subscriber_array, i);
 		ev.msg.hdr.src = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
--