From nobody Sun Nov 24 05:37:58 2024 Received: from forward203d.mail.yandex.net (forward203d.mail.yandex.net [178.154.239.218]) (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 963A22185A4; Thu, 7 Nov 2024 22:07:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.154.239.218 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731017252; cv=none; b=Vx2FE8e4A9QNfwjMsHUnE57/uJh5uZaKRZGOCnd4QVHT5varz6kK42+WW855wLHK8BKb0LFKEHyfUwGkTssiGyAUQk/4prW2xpy28LGaVBAbs+I+FAgZrQvkKmWNTPAFEOGMtXKbRU8K50nz0hRr0FB/5Z5R+7lzcDZj29CYuG8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731017252; c=relaxed/simple; bh=3gAyTEqxFtmMpZPi1zPqaPR2NeXUoPDziLupWC3mfZs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jjDJnH9E8XYJWlGppEDnr9u4i6uf65Mn0Qz5uYYlMZ3AskTpczxiYPlpFvPpOMMrlUCxVhh+N3QFEbFoF5Eyn1QtWjDL/lwTuMIGXII1wxRiMUP87tnXVgqWewUgf8WZ3fEM/wau1lk7rBFb+VhW1hdG/SWh5wvYdu4NMWYzxH4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yandex.ru; spf=pass smtp.mailfrom=yandex.ru; dkim=pass (1024-bit key) header.d=yandex.ru header.i=@yandex.ru header.b=dVl8EWm5; arc=none smtp.client-ip=178.154.239.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yandex.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yandex.ru Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=yandex.ru header.i=@yandex.ru header.b="dVl8EWm5" Received: from forward100d.mail.yandex.net (forward100d.mail.yandex.net [IPv6:2a02:6b8:c41:1300:1:45:d181:d100]) by forward203d.mail.yandex.net (Yandex) with ESMTPS id AFAB564172; Fri, 8 Nov 2024 00:59:20 +0300 (MSK) Received: from mail-nwsmtp-smtp-production-main-36.iva.yp-c.yandex.net (mail-nwsmtp-smtp-production-main-36.iva.yp-c.yandex.net [IPv6:2a02:6b8:c0c:716:0:640:819a:0]) by forward100d.mail.yandex.net (Yandex) with ESMTPS id F2C7260970; Fri, 8 Nov 2024 00:59:11 +0300 (MSK) Received: by mail-nwsmtp-smtp-production-main-36.iva.yp-c.yandex.net (smtp/Yandex) with ESMTPSA id 7xqTJcE2G4Y0-mB20fefE; Fri, 08 Nov 2024 00:59:10 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1731016750; bh=VDkWedm9Sk/c5U5QFEEE0SHcMCmiwfWy8Tyea+SoOlc=; h=Message-ID:Date:In-Reply-To:Cc:Subject:References:To:From; b=dVl8EWm59d+Mcg6z6Oo42XVJQeqdNYxdTn2lJjZ+udQJm2yG8IJoyxOBAN5hEaB5Q e+MiIJO8Ioexl4Ks8VTb7MhZjh4dUwDIBLjeUhGcIpmRmr4l1NPMQurfjAw5Gs3NwS kWk38vmvPSzhqOxtBcNiFIvPbWH9R9JVU5dHIlQQ= Authentication-Results: mail-nwsmtp-smtp-production-main-36.iva.yp-c.yandex.net; dkim=pass header.i=@yandex.ru From: Stas Sergeev To: linux-kernel@vger.kernel.org Cc: Stas Sergeev , Eric Biederman , Andy Lutomirski , Aleksa Sarai , Alexander Viro , Christian Brauner , Jan Kara , Thomas Gleixner , Jeff Layton , John Johansen , Chengming Zhou , Casey Schaufler , Adrian Ratiu , Felix Moessbauer , Jens Axboe , Oleg Nesterov , "Serge E. Hallyn" , linux-fsdevel@vger.kernel.org, Kees Cook , "Peter Zijlstra (Intel)" Subject: [PATCH 1/2] procfs: avoid some usages of seq_file private data Date: Fri, 8 Nov 2024 00:58:20 +0300 Message-ID: <20241107215821.1514623-2-stsp2@yandex.ru> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241107215821.1514623-1-stsp2@yandex.ru> References: <20241107215821.1514623-1-stsp2@yandex.ru> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" seq_file private data carries the inode pointer here. Replace `struct inode *inode =3D m->private;` with: `struct inode *inode =3D file_inode(m->file);` to avoid the reliance on private data. This is needed so that `proc_single_show()` can be used by custom fops that utilize seq_file private data for other things. This is used in the next patch. Signed-off-by: Stas Sergeev CC: Eric Biederman CC: Andy Lutomirski CC: Aleksa Sarai CC: Christian Brauner CC: Thomas Gleixner CC: Jeff Layton CC: Kees Cook CC: "Peter Zijlstra (Intel)" CC: Al Viro CC: Felix Moessbauer CC: Adrian Ratiu CC: Casey Schaufler CC: linux-kernel@vger.kernel.org CC: linux-fsdevel@vger.kernel.org CC: Jan Kara CC: Chengming Zhou CC: Jens Axboe CC: Oleg Nesterov Cc: "Serge E. Hallyn" --- fs/proc/base.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index b31283d81c52..015db8752a99 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -528,7 +528,7 @@ static int proc_pid_schedstat(struct seq_file *m, struc= t pid_namespace *ns, static int lstats_show_proc(struct seq_file *m, void *v) { int i; - struct inode *inode =3D m->private; + struct inode *inode =3D file_inode(m->file); struct task_struct *task =3D get_proc_task(inode); =20 if (!task) @@ -800,7 +800,7 @@ static const struct inode_operations proc_def_inode_ope= rations =3D { =20 static int proc_single_show(struct seq_file *m, void *v) { - struct inode *inode =3D m->private; + struct inode *inode =3D file_inode(m->file); struct pid_namespace *ns =3D proc_pid_ns(inode->i_sb); struct pid *pid =3D proc_pid(inode); struct task_struct *task; @@ -1494,7 +1494,7 @@ static const struct file_operations proc_fail_nth_ope= rations =3D { */ static int sched_show(struct seq_file *m, void *v) { - struct inode *inode =3D m->private; + struct inode *inode =3D file_inode(m->file); struct pid_namespace *ns =3D proc_pid_ns(inode->i_sb); struct task_struct *p; =20 @@ -1546,7 +1546,7 @@ static const struct file_operations proc_pid_sched_op= erations =3D { */ static int sched_autogroup_show(struct seq_file *m, void *v) { - struct inode *inode =3D m->private; + struct inode *inode =3D file_inode(m->file); struct task_struct *p; =20 p =3D get_proc_task(inode); @@ -1745,7 +1745,7 @@ static ssize_t comm_write(struct file *file, const ch= ar __user *buf, =20 static int comm_show(struct seq_file *m, void *v) { - struct inode *inode =3D m->private; + struct inode *inode =3D file_inode(m->file); struct task_struct *p; =20 p =3D get_proc_task(inode); @@ -2641,7 +2641,7 @@ static ssize_t timerslack_ns_write(struct file *file,= const char __user *buf, =20 static int timerslack_ns_show(struct seq_file *m, void *v) { - struct inode *inode =3D m->private; + struct inode *inode =3D file_inode(m->file); struct task_struct *p; int err =3D 0; =20 --=20 2.47.0