| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20230706102706.w7udmbmuwp7hhcry@quack3>
Date: Thu, 6 Jul 2023 12:27:06 +0200
From: Jan Kara <jack@...e.cz>
To: Jeff Layton <jlayton@...nel.org>
Cc: jk@...abs.org, arnd@...db.de, mpe@...erman.id.au, npiggin@...il.com,
christophe.leroy@...roup.eu, hca@...ux.ibm.com, gor@...ux.ibm.com,
agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
svens@...ux.ibm.com, gregkh@...uxfoundation.org, arve@...roid.com,
tkjos@...roid.com, maco@...roid.com, joel@...lfernandes.org,
brauner@...nel.org, cmllamas@...gle.com, surenb@...gle.com,
dennis.dalessandro@...nelisnetworks.com, jgg@...pe.ca,
leon@...nel.org, bwarrum@...ux.ibm.com, rituagar@...ux.ibm.com,
ericvh@...nel.org, lucho@...kov.net, asmadeus@...ewreck.org,
linux_oss@...debyte.com, dsterba@...e.com, dhowells@...hat.com,
marc.dionne@...istor.com, viro@...iv.linux.org.uk, raven@...maw.net,
luisbg@...nel.org, salah.triki@...il.com, aivazian.tigran@...il.com,
ebiederm@...ssion.com, keescook@...omium.org, clm@...com,
josef@...icpanda.com, xiubli@...hat.com, idryomov@...il.com,
jaharkes@...cmu.edu, coda@...cmu.edu, jlbec@...lplan.org,
hch@....de, nico@...xnic.net, rafael@...nel.org, code@...icks.com,
ardb@...nel.org, xiang@...nel.org, chao@...nel.org,
huyue2@...lpad.com, jefflexu@...ux.alibaba.com,
linkinjeon@...nel.org, sj1557.seo@...sung.com, jack@...e.com,
tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org,
hirofumi@...l.parknet.co.jp, miklos@...redi.hu, rpeterso@...hat.com,
agruenba@...hat.com, richard@....at,
anton.ivanov@...bridgegreys.com, johannes@...solutions.net,
mikulas@...ax.karlin.mff.cuni.cz, mike.kravetz@...cle.com,
muchun.song@...ux.dev, dwmw2@...radead.org, shaggy@...nel.org,
tj@...nel.org, trond.myklebust@...merspace.com, anna@...nel.org,
chuck.lever@...cle.com, neilb@...e.de, kolga@...app.com,
Dai.Ngo@...cle.com, tom@...pey.com, konishi.ryusuke@...il.com,
anton@...era.com, almaz.alexandrovich@...agon-software.com,
mark@...heh.com, joseph.qi@...ux.alibaba.com, me@...copeland.com,
hubcap@...ibond.com, martin@...ibond.com, amir73il@...il.com,
mcgrof@...nel.org, yzaikin@...gle.com, tony.luck@...el.com,
gpiccoli@...lia.com, al@...rsen.net, sfrench@...ba.org,
pc@...guebit.com, lsahlber@...hat.com, sprasad@...rosoft.com,
senozhatsky@...omium.org, phillip@...ashfs.org.uk,
rostedt@...dmis.org, mhiramat@...nel.org, dushistov@...l.ru,
hdegoede@...hat.com, djwong@...nel.org, dlemoal@...nel.org,
naohiro.aota@....com, jth@...nel.org, ast@...nel.org,
daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev,
song@...nel.org, yhs@...com, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
jolsa@...nel.org, hughd@...gle.com, akpm@...ux-foundation.org,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, john.johansen@...onical.com, paul@...l-moore.com,
jmorris@...ei.org, serge@...lyn.com, stephen.smalley.work@...il.com,
eparis@...isplace.org, jgross@...e.com, stern@...land.harvard.edu,
lrh2000@....edu.cn, sebastian.reichel@...labora.com,
wsa+renesas@...g-engineering.com, quic_ugoswami@...cinc.com,
quic_linyyuan@...cinc.com, john@...ping.me.uk, error27@...il.com,
quic_uaggarwa@...cinc.com, hayama@...eo.co.jp, jomajm@...il.com,
axboe@...nel.dk, dhavale@...gle.com, dchinner@...hat.com,
hannes@...xchg.org, zhangpeng362@...wei.com, slava@...eyko.com,
gargaditya08@...e.com, penguin-kernel@...ove.SAKURA.ne.jp,
yifeliu@...stonybrook.edu, madkar@...stonybrook.edu,
ezk@...stonybrook.edu, yuzhe@...china.com, willy@...radead.org,
okanatov@...il.com, jeffxu@...omium.org, linux@...blig.org,
mirimmad17@...il.com, yijiangshan@...inos.cn,
yang.yang29@....com.cn, xu.xin16@....com.cn,
chengzhihao1@...wei.com, shr@...kernel.io, Liam.Howlett@...cle.com,
adobriyan@...il.com, chi.minghao@....com.cn,
roberto.sassu@...wei.com, linuszeng@...cent.com, bvanassche@....org,
zohar@...ux.ibm.com, yi.zhang@...wei.com, trix@...hat.com,
fmdefrancesco@...il.com, ebiggers@...gle.com,
princekumarmaurya06@...il.com, chenzhongjin@...wei.com,
riel@...riel.com, shaozhengchao@...wei.com, jingyuwang_vip@....com,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
linux-usb@...r.kernel.org, v9fs@...ts.linux.dev,
linux-fsdevel@...r.kernel.org, linux-afs@...ts.infradead.org,
autofs@...r.kernel.org, linux-mm@...ck.org,
linux-btrfs@...r.kernel.org, ceph-devel@...r.kernel.org,
codalist@...a.cs.cmu.edu, ecryptfs@...r.kernel.org,
linux-efi@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
cluster-devel@...hat.com, linux-um@...ts.infradead.org,
linux-mtd@...ts.infradead.org, jfs-discussion@...ts.sourceforge.net,
linux-nfs@...r.kernel.org, linux-nilfs@...r.kernel.org,
linux-ntfs-dev@...ts.sourceforge.net, ntfs3@...ts.linux.dev,
ocfs2-devel@...ts.linux.dev,
linux-karma-devel@...ts.sourceforge.net, devel@...ts.orangefs.org,
linux-unionfs@...r.kernel.org, linux-hardening@...r.kernel.org,
reiserfs-devel@...r.kernel.org, linux-cifs@...r.kernel.org,
samba-technical@...ts.samba.org, linux-trace-kernel@...r.kernel.org,
linux-xfs@...r.kernel.org, bpf@...r.kernel.org,
netdev@...r.kernel.org, apparmor@...ts.ubuntu.com,
linux-security-module@...r.kernel.org, selinux@...r.kernel.org
Subject: Re: [PATCH v2 08/92] fs: new helper: simple_rename_timestamp
On Wed 05-07-23 14:58:11, Jeff Layton wrote:
> A rename potentially involves updating 4 different inode timestamps. Add
> a function that handles the details sanely, and convert the libfs.c
> callers to use it.
>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
Looks good to me. Feel free to add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/libfs.c | 36 +++++++++++++++++++++++++++---------
> include/linux/fs.h | 2 ++
> 2 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/fs/libfs.c b/fs/libfs.c
> index a7e56baf8bbd..9ee79668c909 100644
> --- a/fs/libfs.c
> +++ b/fs/libfs.c
> @@ -692,6 +692,31 @@ int simple_rmdir(struct inode *dir, struct dentry *dentry)
> }
> EXPORT_SYMBOL(simple_rmdir);
>
> +/**
> + * simple_rename_timestamp - update the various inode timestamps for rename
> + * @old_dir: old parent directory
> + * @old_dentry: dentry that is being renamed
> + * @new_dir: new parent directory
> + * @new_dentry: target for rename
> + *
> + * POSIX mandates that the old and new parent directories have their ctime and
> + * mtime updated, and that inodes of @old_dentry and @new_dentry (if any), have
> + * their ctime updated.
> + */
> +void simple_rename_timestamp(struct inode *old_dir, struct dentry *old_dentry,
> + struct inode *new_dir, struct dentry *new_dentry)
> +{
> + struct inode *newino = d_inode(new_dentry);
> +
> + old_dir->i_mtime = inode_set_ctime_current(old_dir);
> + if (new_dir != old_dir)
> + new_dir->i_mtime = inode_set_ctime_current(new_dir);
> + inode_set_ctime_current(d_inode(old_dentry));
> + if (newino)
> + inode_set_ctime_current(newino);
> +}
> +EXPORT_SYMBOL_GPL(simple_rename_timestamp);
> +
> int simple_rename_exchange(struct inode *old_dir, struct dentry *old_dentry,
> struct inode *new_dir, struct dentry *new_dentry)
> {
> @@ -707,11 +732,7 @@ int simple_rename_exchange(struct inode *old_dir, struct dentry *old_dentry,
> inc_nlink(old_dir);
> }
> }
> - old_dir->i_ctime = old_dir->i_mtime =
> - new_dir->i_ctime = new_dir->i_mtime =
> - d_inode(old_dentry)->i_ctime =
> - d_inode(new_dentry)->i_ctime = current_time(old_dir);
> -
> + simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
> return 0;
> }
> EXPORT_SYMBOL_GPL(simple_rename_exchange);
> @@ -720,7 +741,6 @@ int simple_rename(struct mnt_idmap *idmap, struct inode *old_dir,
> struct dentry *old_dentry, struct inode *new_dir,
> struct dentry *new_dentry, unsigned int flags)
> {
> - struct inode *inode = d_inode(old_dentry);
> int they_are_dirs = d_is_dir(old_dentry);
>
> if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
> @@ -743,9 +763,7 @@ int simple_rename(struct mnt_idmap *idmap, struct inode *old_dir,
> inc_nlink(new_dir);
> }
>
> - old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
> - new_dir->i_mtime = inode->i_ctime = current_time(old_dir);
> -
> + simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
> return 0;
> }
> EXPORT_SYMBOL(simple_rename);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index bdfbd11a5811..14e38bd900f1 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2979,6 +2979,8 @@ extern int simple_open(struct inode *inode, struct file *file);
> extern int simple_link(struct dentry *, struct inode *, struct dentry *);
> extern int simple_unlink(struct inode *, struct dentry *);
> extern int simple_rmdir(struct inode *, struct dentry *);
> +void simple_rename_timestamp(struct inode *old_dir, struct dentry *old_dentry,
> + struct inode *new_dir, struct dentry *new_dentry);
> extern int simple_rename_exchange(struct inode *old_dir, struct dentry *old_dentry,
> struct inode *new_dir, struct dentry *new_dentry);
> extern int simple_rename(struct mnt_idmap *, struct inode *,
> --
> 2.41.0
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
Powered by blists - more mailing lists