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=1794049587; b=atW/fqIelkVcX8FlquEZ+kJ/VWVBelieLd5xO7nb9qTOVbdfDG3WA8eYS7guSfHN9g2g vXlNTKn+P9qZQRqQFeyF7JOLjZ5O8wneNn6KoEK+XUMCRiq71eBSCwNcNUDb/wfScUKZa ytqhRRz14mOTbMtJXrYttsr4fYvxGVJ5IiUpnkX73Ep4XZ6egUqmlEBXsn6nfehiw4irO O7TM/060ta3ReQWYBemRM/yDkGfPKr+JoETKHGgK5RHHCcGEMVEAwf3+tIE/cXZ2eJ+k0 6Ckme6YtikM0x5RgLMMvKQ3GdOzSXzQ+nD9gie8HwiUSJVhV9U7EIPMfhIC8xHVCFOA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794049587; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=spzKwbDfyjvjF0JdD+fU0kHdE0SVZfg5ss3TvvlUZJE=; b=Ra9hwd8d6ptIv+QYGm/1P5vnjwFOVAAUQoJx1A97Uv3XZOn0BuHyrDNyiyqc8601oVMn fm1qpdpeM5DbAntMYJQxX9kbnUG4ufGjaeRHio84mo8ignaa+Ylc8zQ9ZdN7Gqcv+kjjn qiQyisNELJH2WT7TwV7s/cYVTb4a16stzcR2TPHy6YqjPV/b6ZX3lGwohoEeSwnpV/z4l pYsngXSjGyBu5RvUvwTxgYBhyK7dRrZRLFyw5jO9yZgZXNDVXaGaAgtdE7FMgDhPGEhPC njhTBcDjaP0zznZ4g8FEJS4U1hsXdo2DhK7p+LfZOUYlcLkV6ZiEE7Oo5omxvVDptYA== 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=NcliFN4b; 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 341C0606A326 for ; Sat, 7 Nov 2026 11:06:27 +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=NcliFN4b Received: by smtp.kernel.org (Postfix) with ESMTPSA id A238C1F0089F; Sat, 7 Nov 2026 11:06:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794049587; bh=spzKwbDfyjvjF0JdD+fU0kHdE0SVZfg5ss3TvvlUZJE=; h=From:To:Cc:Subject:Date; b=NcliFN4b+VqZhray4IoiuwPesfPefFvEQBLtHIJHiG7IlMiMzizuvsmQDFe+t5iKC gliiGDlJM/OCAcfoT8SKhZJ/QL3JNPZiIYdqaSQ58NlYMEJUJw4lFX4izIEOW7col9 ngx0rdkxhC/R4rWxuLEOA6Mjl7bQB+VA6W9HJlyqzLZqeDbOsTfobX+whNXjWPOPV9 IMjbV5i4tC+7r4mJZKUCXMvvc+ldAQivtaw+kcc1NQvV4ufZG6MWBg2qIJooZsLpc8 t1SQbQpfTTmAwCYlXqt1GX/+60LbgS1fATG3WsxnbRM46bttiwEy1NYAao8yH3G4uJ BUa/dX/xD/l3Q== From: Sasha Levin To: dungvn2345@gmail.com, luiz.von.dentz@intel.com Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] Bluetooth: hci_debugfs: Pin module for debugfs file operations" failed to apply to 5.15-stable tree Date: Sat, 7 Nov 2026 06:06:25 -0500 Message-ID: <20261107060625-failed-5.15-2a3e2287877b@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 5.15-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-5.15.y git checkout FETCH_HEAD git cherry-pick -x 2a3e2287877b1ee40ffb80b7d769b633866533f3 # git commit -s git send-email --to '' --in-reply-to '20261107060625-failed-5.15-2a3e2287877b@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 2a3e2287877b1ee40ffb80b7d769b633866533f3 Mon Sep 17 00:00:00 2001 From: Bui Viet Dung Date: Thu, 8 Oct 2026 12:01:40 +0700 Subject: [PATCH] Bluetooth: hci_debugfs: Pin module for debugfs file operations An open debugfs file retains its file_operations pointer in the debugfs proxy state. However, the file_operations defined in hci_debugfs.c (use_debug_keys_fops, sc_only_mode_fops, ssp_debug_mode_fops, force_bredr_smp_fops, force_static_address_fops, force_no_mitm_fops, dut_mode_fops, vendor_diag_fops, and the DEFINE_QUIRK_ATTRIBUTE macro) 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 a userspace process opens any of these debugfs files, a subsequent controller removal and module unload (rmmod bluetooth) can succeed while the file descriptor remains open. 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/hci_debugfs.c and verified on a Linux 7.3-rc6 test VM with CONFIG_BT=m. Set .owner = THIS_MODULE on all debugfs file_operations tables in hci_debugfs.c so that debugfs keeps the module loaded until close has finished. Fixes: 0886aea6acd2 ("Bluetooth: Expose debug keys usage setting via debugfs") Cc: stable@vger.kernel.org Signed-off-by: Bui Viet Dung Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/hci_debugfs.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c index 2559fb6324d63..cd5ef398f2382 100644 --- a/net/bluetooth/hci_debugfs.c +++ b/net/bluetooth/hci_debugfs.c @@ -65,6 +65,7 @@ static ssize_t __name ## _write(struct file *file, \ } \ \ static const struct file_operations __name ## _fops = { \ + .owner = THIS_MODULE, \ .open = simple_open, \ .read = __name ## _read, \ .write = __name ## _write, \ @@ -283,6 +284,7 @@ static ssize_t use_debug_keys_read(struct file *file, char __user *user_buf, } static const struct file_operations use_debug_keys_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = use_debug_keys_read, .llseek = default_llseek, @@ -301,6 +303,7 @@ static ssize_t sc_only_mode_read(struct file *file, char __user *user_buf, } static const struct file_operations sc_only_mode_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = sc_only_mode_read, .llseek = default_llseek, @@ -437,6 +440,7 @@ static ssize_t ssp_debug_mode_read(struct file *file, char __user *user_buf, } static const struct file_operations ssp_debug_mode_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = ssp_debug_mode_read, .llseek = default_llseek, @@ -529,6 +533,7 @@ static ssize_t force_bredr_smp_write(struct file *file, } static const struct file_operations force_bredr_smp_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = force_bredr_smp_read, .write = force_bredr_smp_write, @@ -778,6 +783,7 @@ static ssize_t force_static_address_write(struct file *file, } static const struct file_operations force_static_address_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = force_static_address_read, .write = force_static_address_write, @@ -1177,6 +1183,7 @@ static ssize_t force_no_mitm_write(struct file *file, } static const struct file_operations force_no_mitm_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = force_no_mitm_read, .write = force_no_mitm_write, @@ -1315,6 +1322,7 @@ static ssize_t dut_mode_write(struct file *file, const char __user *user_buf, } static const struct file_operations dut_mode_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = dut_mode_read, .write = dut_mode_write, @@ -1371,6 +1379,7 @@ static ssize_t vendor_diag_write(struct file *file, const char __user *user_buf, } static const struct file_operations vendor_diag_fops = { + .owner = THIS_MODULE, .open = simple_open, .read = vendor_diag_read, .write = vendor_diag_write, -- 2.53.0