From: Max Kellermann <max.kellermann@ionos.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tejun Heo <tj@kernel.org>, Zefan Li <lizefan.x@bytedance.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org
Cc: Max Kellermann <max.kellermann@ionos.com>
Subject: [PATCH v2 1/2] kernel/cgroup: use kernfs_create_dir_ns()
Date: Fri, 8 Dec 2023 10:33:09 +0100 [thread overview]
Message-ID: <20231208093310.297233-1-max.kellermann@ionos.com> (raw)
By passing the fsugid to kernfs_create_dir_ns(), we don't need
cgroup_kn_set_ugid() any longer. That function was added for exactly
this purpose by commit 49957f8e2a43 ("cgroup: newly created dirs and
files should be owned by the creator").
Eliminating this piece of duplicate code means we benefit from future
improvements to kernfs_create_dir_ns(); for example, both are lacking
S_ISGID support currently, which my next patch will add to
kernfs_create_dir_ns(). It cannot (easily) be added to
cgroup_kn_set_ugid() because we can't dereference struct kernfs_iattrs
from there.
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Acked-by: Tejun Heo <tj@kernel.org>
--
v1 -> v2: 12-digit commit id
---
kernel/cgroup/cgroup.c | 31 ++++---------------------------
1 file changed, 4 insertions(+), 27 deletions(-)
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 4b9ff41ca603..a844b421fd83 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4169,20 +4169,6 @@ static struct kernfs_ops cgroup_kf_ops = {
.seq_show = cgroup_seqfile_show,
};
-/* set uid and gid of cgroup dirs and files to that of the creator */
-static int cgroup_kn_set_ugid(struct kernfs_node *kn)
-{
- struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
- .ia_uid = current_fsuid(),
- .ia_gid = current_fsgid(), };
-
- if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
- gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
- return 0;
-
- return kernfs_setattr(kn, &iattr);
-}
-
static void cgroup_file_notify_timer(struct timer_list *timer)
{
cgroup_file_notify(container_of(timer, struct cgroup_file,
@@ -4195,25 +4181,18 @@ static int cgroup_add_file(struct cgroup_subsys_state *css, struct cgroup *cgrp,
char name[CGROUP_FILE_NAME_MAX];
struct kernfs_node *kn;
struct lock_class_key *key = NULL;
- int ret;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
key = &cft->lockdep_key;
#endif
kn = __kernfs_create_file(cgrp->kn, cgroup_file_name(cgrp, cft, name),
cgroup_file_mode(cft),
- GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
+ current_fsuid(), current_fsgid(),
0, cft->kf_ops, cft,
NULL, key);
if (IS_ERR(kn))
return PTR_ERR(kn);
- ret = cgroup_kn_set_ugid(kn);
- if (ret) {
- kernfs_remove(kn);
- return ret;
- }
-
if (cft->file_offset) {
struct cgroup_file *cfile = (void *)css + cft->file_offset;
@@ -5616,7 +5595,9 @@ static struct cgroup *cgroup_create(struct cgroup *parent, const char *name,
goto out_cancel_ref;
/* create the directory */
- kn = kernfs_create_dir(parent->kn, name, mode, cgrp);
+ kn = kernfs_create_dir_ns(parent->kn, name, mode,
+ current_fsuid(), current_fsgid(),
+ cgrp, NULL);
if (IS_ERR(kn)) {
ret = PTR_ERR(kn);
goto out_stat_exit;
@@ -5761,10 +5742,6 @@ int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode)
*/
kernfs_get(cgrp->kn);
- ret = cgroup_kn_set_ugid(cgrp->kn);
- if (ret)
- goto out_destroy;
-
ret = css_populate_dir(&cgrp->self);
if (ret)
goto out_destroy;
--
2.39.2
next reply other threads:[~2023-12-08 9:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-08 9:33 Max Kellermann [this message]
2023-12-08 9:33 ` [PATCH v2 2/2] fs/kernfs/dir: obey S_ISGID Max Kellermann
2023-12-21 6:57 ` Bagas Sanjaya
2023-12-20 16:33 ` [PATCH v2 1/2] kernel/cgroup: use kernfs_create_dir_ns() Michal Koutný
2023-12-21 6:56 ` Bagas Sanjaya
2023-12-21 21:29 ` Tejun Heo
2023-12-22 6:15 ` Greg Kroah-Hartman
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