linux-kernel - Re: [syzbot] [keyrings?] [lsm?] [ext4?] possible deadlock in keyring

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Message-ID: <tencent_AC4A33669E2C1B724B1C1BCA2552BA67BB08@qq.com>
Date: Sun, 22 Sep 2024 19:28:13 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+1b2d1134e0b675176a15@...kaller.appspotmail.com
Cc: dhowells@...hat.com,
	jarkko@...nel.org,
	jmorris@...ei.org,
	keyrings@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	paul@...l-moore.com,
	serge@...lyn.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [keyrings?] [lsm?] [ext4?] possible deadlock in keyring_clear (2)

Use GFP_NOFS

#syz test

diff --git a/lib/assoc_array.c b/lib/assoc_array.c
index 388e656ac974..b6fd9e909b79 100644
--- a/lib/assoc_array.c
+++ b/lib/assoc_array.c
@@ -977,7 +977,7 @@ struct assoc_array_edit *assoc_array_insert(struct assoc_array *array,
 	 */
 	BUG_ON(assoc_array_ptr_is_meta(object));
 
-	edit = kzalloc(sizeof(struct assoc_array_edit), GFP_KERNEL);
+	edit = kzalloc(sizeof(struct assoc_array_edit), GFP_NOFS);
 	if (!edit)
 		return ERR_PTR(-ENOMEM);
 	edit->array = array;