From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Miklos Szeredi <mszeredi@redhat.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] call_with_creds()
Date: Wed, 18 Jul 2018 21:15:18 +0100 [thread overview]
Message-ID: <20180718201518.GX30522@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180718200411.GW30522@ZenIV.linux.org.uk>
On Wed, Jul 18, 2018 at 09:04:11PM +0100, Al Viro wrote:
> On Wed, Jul 18, 2018 at 12:53:48PM -0700, Linus Torvalds wrote:
> > On Wed, Jul 18, 2018 at 12:46 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
> > >
> > > Huh? Nevermind ->write(), what about open()?
> >
> > What about open?
> >
> > At open time, file->f_cred is the same as current_cred().
>
> int cachefiles_write_page(struct fscache_storage *op, struct page *page)
> {
> ...
> file = dentry_open(&path, O_RDWR | O_LARGEFILE, cache->cache_cred);
>
>
> int ecryptfs_privileged_open(struct file **lower_file,
> struct dentry *lower_dentry,
> struct vfsmount *lower_mnt,
> const struct cred *cred)
> ...
> (*lower_file) = dentry_open(&req.path, flags, cred);
Actually, scratch that one - in this case it is current_cred() (whether that's
the right value or not).
cachefile_write_page() case is for real, AFAICS.
next prev parent reply other threads:[~2018-07-18 20:15 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 0:17 linux-next: manual merge of the vfs tree with the overlayfs tree Stephen Rothwell
2018-07-10 15:04 ` Al Viro
2018-07-11 2:11 ` Al Viro
2018-07-11 2:21 ` [RFC][PATCH 01/42] drm_mode_create_lease_ioctl(): fix open-coded filp_clone_open() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 02/42] cxl_getfile(): fix double-iput() on alloc_file() failures Al Viro
2018-07-11 2:21 ` [RFC][PATCH 03/42] ocxlflash_getfile(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 04/42] make get_empty_filp() to call file_free_rcu() directly Al Viro
2018-07-11 2:35 ` Linus Torvalds
2018-07-11 2:43 ` Al Viro
2018-07-11 2:21 ` [RFC][PATCH 05/42] fold security_file_free() into file_free() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 06/42] turn filp_clone_open() into inline wrapper for dentry_open() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 07/42] create_pipe_files(): use fput() if allocation of the second file fails Al Viro
2018-07-11 2:21 ` [RFC][PATCH 08/42] make sure do_dentry_open() won't return positive as an error Al Viro
2018-07-11 2:39 ` Linus Torvalds
2018-07-11 2:41 ` Al Viro
2018-07-11 2:21 ` [RFC][PATCH 09/42] pass creds to get_empty_filp(), make sure dentry_open() passes the right creds Al Viro
2018-07-11 2:21 ` [RFC][PATCH 10/42] get rid of cred argument of vfs_open() and do_dentry_open() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 11/42] security_file_open(): lose cred argument Al Viro
2018-07-11 2:21 ` [RFC][PATCH 12/42] ->file_open(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 13/42] introduce FMODE_OPENED Al Viro
2018-07-11 2:21 ` [RFC][PATCH 14/42] fold put_filp() into fput() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 15/42] lift fput() on late failures into path_openat() Al Viro
2018-07-11 5:43 ` Amir Goldstein
2018-07-11 2:21 ` [RFC][PATCH 16/42] now we can fold open_check_o_direct() into do_dentry_open() Al Viro
2018-07-11 2:44 ` Linus Torvalds
2018-07-11 2:59 ` Al Viro
2018-07-11 3:13 ` Linus Torvalds
2018-07-11 2:21 ` [RFC][PATCH 17/42] switch all remaining checks for FILE_OPENED to FMODE_OPENED Al Viro
2018-07-11 2:21 ` [RFC][PATCH 18/42] introduce FMODE_CREATED and switch to it Al Viro
2018-07-11 2:21 ` [RFC][PATCH 19/42] IMA: don't propagate opened through the entire thing Al Viro
2018-07-11 2:21 ` [RFC][PATCH 20/42] getting rid of 'opened' argument of ->atomic_open() - step 1 Al Viro
2018-07-11 2:21 ` [RFC][PATCH 21/42] getting rid of 'opened' argument of ->atomic_open() - part 2 Al Viro
2018-07-11 2:21 ` [RFC][PATCH 22/42] get rid of 'opened' argument of ->atomic_open() - part 3 Al Viro
2018-07-11 2:21 ` [RFC][PATCH 23/42] get rid of 'opened' in path_openat() and the helpers downstream Al Viro
2018-07-11 2:21 ` [RFC][PATCH 24/42] ->atomic_open(): return 0 in all success cases Al Viro
2018-07-11 2:21 ` [RFC][PATCH 25/42] document ->atomic_open() changes Al Viro
2018-07-11 2:21 ` [RFC][PATCH 26/42] switch atomic_open() and lookup_open() to returning 0 in all success cases Al Viro
2018-07-11 2:21 ` [RFC][PATCH 27/42] kill FILE_{CREATED,OPENED} Al Viro
2018-07-11 2:21 ` [RFC][PATCH 28/42] new wrapper: alloc_file_pseudo() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 29/42] __shmem_file_setup(): reorder allocations Al Viro
2018-07-11 2:21 ` [RFC][PATCH 30/42] ... and switch shmem_file_setup() to alloc_file_pseudo() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 31/42] cxl_getfile(): switch " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 32/42] ocxlflash_getfile(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 33/42] hugetlb_file_setup(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 34/42] anon_inode_getfile(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 35/42] create_pipe_files(): switch the first allocation " Al Viro
2018-07-11 2:22 ` [RFC][PATCH 36/42] new helper: alloc_file_clone() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 37/42] do_shmat(): grab shp->shm_file earlier, switch to alloc_file_clone() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 38/42] make alloc_file() static Al Viro
2018-07-11 2:22 ` [RFC][PATCH 39/42] document alloc_file() changes Al Viro
2018-07-11 2:22 ` [RFC][PATCH 40/42] make path_init() unconditionally paired with terminate_walk() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 41/42] allow link_path_walk() to take ERR_PTR() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 42/42] few more cleanups of link_path_walk() callers Al Viro
2018-07-11 2:56 ` [RFC][PATCH 01/42] drm_mode_create_lease_ioctl(): fix open-coded filp_clone_open() Linus Torvalds
2018-07-11 15:25 ` Al Viro
2018-07-11 16:15 ` Al Viro
2018-07-12 12:43 ` Al Viro
2018-07-12 15:05 ` Linus Torvalds
2018-07-12 15:53 ` vfs / overlayfs conflict resolution for linux-next Al Viro
2018-07-18 2:56 ` Al Viro
2018-07-18 3:29 ` Stephen Rothwell
2018-07-18 7:25 ` Miklos Szeredi
2018-07-18 12:10 ` Miklos Szeredi
2018-07-18 12:43 ` Al Viro
2018-07-18 13:46 ` Al Viro
2018-07-18 15:46 ` Miklos Szeredi
2018-07-18 18:12 ` [RFC] call_with_creds() Al Viro
2018-07-18 18:19 ` Linus Torvalds
2018-07-18 19:46 ` Al Viro
2018-07-18 19:53 ` Linus Torvalds
2018-07-18 20:04 ` Al Viro
2018-07-18 20:15 ` Al Viro [this message]
2018-07-18 20:43 ` Linus Torvalds
2018-07-18 21:22 ` Al Viro
2018-07-18 23:06 ` Linus Torvalds
2018-07-18 21:27 ` David Howells
2018-07-18 23:16 ` Linus Torvalds
2018-07-18 21:28 ` David Howells
2018-07-18 23:13 ` Linus Torvalds
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