Max Kellermann f4dce08ba1 fs/kernfs/dir: obey S_ISGID ... [ Upstream commit 5133bee62f ] Handling of S_ISGID is usually done by inode_init_owner() in all other filesystems, but kernfs doesn't use that function. In kernfs, struct kernfs_node is the primary data structure, and struct inode is only created from it on demand. Therefore, inode_init_owner() can't be used and we need to imitate its behavior. S_ISGID support is useful for the cgroup filesystem; it allows subtrees managed by an unprivileged process to retain a certain owner gid, which then enables sharing access to the subtree with another unprivileged process. -- v1 -> v2: minor coding style fix (comment) Signed-off-by: Max Kellermann <max.kellermann@ionos.com> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20231208093310.297233-2-max.kellermann@ionos.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-02-23 08:54:51 +01:00
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Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
dir.c	fs/kernfs/dir: obey S_ISGID	2024-02-23 08:54:51 +01:00
file.c	kernfs: switch kernfs to use an rwsem	2021-07-27 09:29:15 +02:00
inode.c	kernfs: use i_lock to protect concurrent inode updates	2021-07-27 09:29:15 +02:00
kernfs-internal.h	kernfs: switch kernfs to use an rwsem	2021-07-27 09:29:15 +02:00
mount.c	kernfs: use i_lock to protect concurrent inode updates	2021-07-27 09:29:15 +02:00
symlink.c	kernfs: switch kernfs to use an rwsem	2021-07-27 09:29:15 +02:00