From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794048562; b=fbOpdZtt4PpBZ4Si3oBgl14n4fg+hgCgwHrfcJllv6oQwCp3el2nZIDkRL3Mhps7FlO+ QxY0qoBS4y1xNAb9VomWGSSrHjuAgZK7x0lYei6zPD7+xmp0AZBRqkJfsAZXaGKQf7hU6 edpuXW9t9sE+iIwGkh98g+S09nGjOWIbiRQl+2V/WU63+M0/lipxvlBGhG5gnrrfIb3rl GFYOIqD/0cb0tr5a7Wk3lalTVyA0t9gm4GwfJ9kYS9my2VgcOGrF2DpURy7KI933he38j 8JzmknCiGkjaElHSxa5mvMDCGmbncMsQXODQnaZq1z/75rdH/zQmjhivZT8Wi3q8HhQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794048562; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=62z6FLjWI+r3DiNELpahqJhjTZiljT5Oyrt+Tlypoho=; b=3uh4m5oUhn5N5ErydeonvLpDNfWFBYp/i1BqPbgmQiULxe11tEjcgyJ3TmfWLJ4LCbbR 4IbB075hk9CkfRL7Rt7kXUPA81//znoirWWd0TuDhWSFgOZPlPF4Jv/s8nlQBpA8zM4Am /kYP40S5BJr2KJimoP8Mi3Vfi94qpGAxUQWqqYy/gDBMn9qtupp1elwkj7Dv0f4njrEHZ cR6FytsbjcR3DqtvaKjSTZdQzZjIxtZdP0rMmATGziuiwHxNPJw7iOvwMjrORL1L73foK akTqvM5uwT9oY8h7Ou+/P7R2YD5Jtk95RxCgYsT12v7Ta1ohxZoHqK65PUI1i6mSI6Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=bTS3OWBh; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE9E4606A33C for ; Sat, 7 Nov 2026 10:49:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=bTS3OWBh Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C6A61F008A4; Sat, 7 Nov 2026 10:49:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794048561; bh=62z6FLjWI+r3DiNELpahqJhjTZiljT5Oyrt+Tlypoho=; h=From:To:Cc:Subject:Date; b=bTS3OWBhekfg9n24ElmdqKfMWVh7bmyqf1iFcMs2m7SvARtzMSFErrr+Z73H1nmiT iLipBuPKSQlVib9/iavuTk0DxZZEI5Tn1Q9oR9wqPX5CdeM0ibgNhcRKtZ824Cu2aq 1e0NjLZ6GHROyVO5ouxautNSZH7S0vj2XGAsXs5tQVrrUVpaUe8zZBVRinQy1SWOqG qOGYW3sZs6l45KqFjkDuK0Xx4helSNjllY1KL8m6QeoqzjCdipk4l8aBF5riNfsqTD Mn8UExID7dptv3hiQA5LgfuEVdEKsf8xCxV6cWRx0g1tuXj4OwgN+TKkrKhtw849+p 02T7xiwRcEygA== From: Sasha Levin To: dungvn2345@gmail.com, luiz.von.dentz@intel.com Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] Bluetooth: selftest: Pin module for selftest debugfs file operations" failed to apply to 6.1-stable tree Date: Sat, 7 Nov 2026 05:49:20 -0500 Message-ID: <20261107054920-failed-6.1-64aabf94eccc@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 64aabf94ecccb1120a63b4ee5a6761871a181a41 # git commit -s git send-email --to '' --in-reply-to '20261107054920-failed-6.1-64aabf94eccc@kernel.org' --subject-prefix 'PATCH 6.1.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 64aabf94ecccb1120a63b4ee5a6761871a181a41 Mon Sep 17 00:00:00 2001 From: Bui Viet Dung Date: Thu, 8 Oct 2026 12:18:03 +0700 Subject: [PATCH] Bluetooth: selftest: Pin module for selftest debugfs file operations An open debugfs file retains its file_operations pointer in the debugfs proxy state. However, test_smp_fops in net/bluetooth/smp.c and test_ecdh_fops in net/bluetooth/selftest.c have no .owner set to THIS_MODULE. As a result, full_proxy_open_regular() calls fops_get() which succeeds without taking a reference to the bluetooth module. When CONFIG_BT=m and selftests are enabled, a userspace process can open either /sys/kernel/debug/bluetooth/selftest_smp or /sys/kernel/debug/bluetooth/selftest_ecdh and keep the file descriptor open while the module is unloaded (rmmod bluetooth). When the userspace process subsequently closes the descriptor, full_proxy_release() accesses the already unmapped file_operations structure, triggering a kernel oops in full_proxy_release(): BUG: unable to handle page fault for address: fffffbfff8056f03 #PF: supervisor read access in kernel mode Oops: 0000 [#1] SMP KASAN NOPTI RIP: 0010:full_proxy_release+0x8e/0x140 Call Trace: __fput+0x39f/0xa60 fput_close_sync+0xff/0x200 __x64_sys_close+0x8c/0xf0 do_syscall_64+0x115/0x6a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f The issue was discovered via manual code audit of net/bluetooth/smp.c and net/bluetooth/selftest.c. Set .owner = THIS_MODULE on test_smp_fops and test_ecdh_fops so that debugfs keeps the module pinned until the file descriptors are closed. Fixes: 64dd374eac15 ("Bluetooth: Export SMP selftest result in debugfs") Fixes: 6de50f9fdb60 ("Bluetooth: Export ECDH selftest result in debugfs") Cc: stable@vger.kernel.org Signed-off-by: Bui Viet Dung Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/selftest.c | 1 + net/bluetooth/smp.c | 1 + 2 files changed, 2 insertions(+) diff --git a/net/bluetooth/selftest.c b/net/bluetooth/selftest.c index ae5b44bb9d3d3..cdfc40e0016b4 100644 --- a/net/bluetooth/selftest.c +++ b/net/bluetooth/selftest.c @@ -188,6 +188,7 @@ static ssize_t test_ecdh_read(struct file *file, char __user *user_buf, } static const struct file_operations test_ecdh_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = test_ecdh_read, .llseek = default_llseek, diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 5c3bd42783860..5dac8b2eae42d 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -3698,6 +3698,7 @@ static ssize_t test_smp_read(struct file *file, char __user *user_buf, } static const struct file_operations test_smp_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = test_smp_read, .llseek = default_llseek, -- 2.53.0