From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B74F43905F4; Fri, 4 Sep 2026 05:47:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788500828; cv=none; b=TVk4VEhX8KR/lHIMQxdV8HiguEcaXJgUGqwTQ0FYr5A4KaPWxpIQCeqr6Vg4g/9IYVJWGq5TUdMvaG99YfYf2m0cjXNN9l9WWdk02bQrmXYLDggMWAiAthnac2ZEZ9z4Jk+CoIZqmdylp7qv1Ql+EIfx29oq2NaZbwu3JvktIgA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788500828; c=relaxed/simple; bh=Co/SGqHHoKxhlg+OIkCqXOXASlWv53TO9pzyKXmPhS0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JnrNunKZH6VUsrQGAVfnACm1zxSClmg5tsRSDWrHy5LSmqqsj0N0HXNSriFEPMnJ1EKLm6OHJ0olVQiSWfuc8LLdYPAwOYsq4Un6tjvnuNAjyK7G45DL1oltRG2xeVyfcUwustL1av/qhFkBmSC8IBVlPe6AnP5TJWbIF0ajGIY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OVdLRkXG; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="OVdLRkXG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C7111F00A3D; Fri, 4 Sep 2026 05:47:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788500827; bh=SgkYkzHYz2WzIrTQ0OM4h6Oz94SrqA0kWiKnrqklumg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OVdLRkXGRooRswJXnds87T6lbxOIricrjzSEHHnX5BXMcWazu5oUxyKrNlpCYfDHn tiu/sPnyIaqfs6LnhLLxx7jP4cqTZeqdjmb9gph5CbGjrRjXq7sP/lUdKmk9YuR6Zd Xzr4VhnaWq6utt9UJpUwcg6evA9McSwFV6YhWM1w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yichong Chen , Tyler Hicks Subject: [PATCH 6.18 193/552] ecryptfs: hold msg ctx list lock when cleaning daemon queue Date: Fri, 4 Sep 2026 06:55:50 +0200 Message-ID: <20260904045753.391515443@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045747.813364717@linuxfoundation.org> References: <20260904045747.813364717@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yichong Chen commit 779972513c2fa8c7938e54976f686091dafff22f upstream. ecryptfs_exorcise_daemon() drops queued messages from a dying daemon without holding ecryptfs_msg_ctx_lists_mux, but ecryptfs_msg_ctx_alloc_to_free() requires that lock. Take the list lock while moving the queued contexts back to the free list to avoid racing with other global msg ctx list users. Fixes: f66e883eb618 ("eCryptfs: integrate eCryptfs device handle into the module.") Cc: Signed-off-by: Yichong Chen Signed-off-by: Tyler Hicks Signed-off-by: Greg Kroah-Hartman --- fs/ecryptfs/messaging.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/ecryptfs/messaging.c +++ b/fs/ecryptfs/messaging.c @@ -165,6 +165,7 @@ int ecryptfs_exorcise_daemon(struct ecry mutex_unlock(&daemon->mux); goto out; } + mutex_lock(&ecryptfs_msg_ctx_lists_mux); list_for_each_entry_safe(msg_ctx, msg_ctx_tmp, &daemon->msg_ctx_out_queue, daemon_out_list) { list_del(&msg_ctx->daemon_out_list); @@ -173,6 +174,7 @@ int ecryptfs_exorcise_daemon(struct ecry "the out queue of a dying daemon\n", __func__); ecryptfs_msg_ctx_alloc_to_free(msg_ctx); } + mutex_unlock(&ecryptfs_msg_ctx_lists_mux); hlist_del(&daemon->euid_chain); mutex_unlock(&daemon->mux); kfree_sensitive(daemon);