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kernfs: allow creating kernfs objects with arbitrary uid/gid

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This change allows creating kernfs files and directories with arbitrary
uid/gid instead of always using GLOBAL_ROOT_UID/GID by extending
kernfs_create_dir_ns() and kernfs_create_file_ns() with uid/gid arguments.
The "simple" kernfs_create_file() and kernfs_create_dir() are left alone
and always create objects belonging to the global root.

When creating symlinks ownership (uid/gid) is taken from the target kernfs
object.

Co-Developed-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Torokhov
2018-07-20 21:56:47 +00:00
committed by David S. Miller
parent 7c4ec749a3
commit 488dee96bb
10 changed files with 76 additions and 21 deletions
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4
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
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@@ -146,6 +146,7 @@ static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
int ret;
kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
0, rft->kf_ops, rft, NULL, NULL);
if (IS_ERR(kn))
return PTR_ERR(kn);
@@ -1503,7 +1504,8 @@ static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
struct kernfs_node *kn;
int ret = 0;
kn = __kernfs_create_file(parent_kn, name, 0444, 0,
kn = __kernfs_create_file(parent_kn, name, 0444,
GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
&kf_mondata_ops, priv, NULL, NULL);
if (IS_ERR(kn))
return PTR_ERR(kn);