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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date: Thu, 18 Jan 2024 08:45:48 -0800
From: syzbot <syzbot+09b349b3066c2e0b1e96@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [syzbot] [nfs?] KMSAN: kernel-infoleak in
 sys_name_to_handle_at (4)

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.

***

Subject: [syzbot] [nfs?] KMSAN: kernel-infoleak in sys_name_to_handle_at (4)
Author: n.zhandarovich@...tech.ru

Try using kzalloc() instead of kmalloc() in do_sys_name_to_handle()

#syz test: https://github.com/google/kmsan.git master

---
 fs/fhandle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fhandle.c b/fs/fhandle.c
index 18b3ba8dc8ea..57a12614addf 100644
--- a/fs/fhandle.c
+++ b/fs/fhandle.c
@@ -36,7 +36,7 @@ static long do_sys_name_to_handle(const struct path *path,
 	if (f_handle.handle_bytes > MAX_HANDLE_SZ)
 		return -EINVAL;
 
-	handle = kmalloc(sizeof(struct file_handle) + f_handle.handle_bytes,
+	handle = kzalloc(sizeof(struct file_handle) + f_handle.handle_bytes,
 			 GFP_KERNEL);
 	if (!handle)
 		return -ENOMEM;
-- 
2.25.1