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fs: port acl to mnt_idmap

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Convert to struct mnt_idmap.

Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.

Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.

Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.

Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2023-01-13 12:49:24 +01:00
committed by Christian Brauner (Microsoft)
parent 39f60c1cce
commit 700b794052
28 changed files with 114 additions and 121 deletions
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10
include/linux/ima.h
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@@ -187,14 +187,14 @@ extern void ima_inode_post_setattr(struct mnt_idmap *idmap,
struct dentry *dentry);
extern int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
const void *xattr_value, size_t xattr_value_len);
extern int ima_inode_set_acl(struct user_namespace *mnt_userns,
extern int ima_inode_set_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name,
struct posix_acl *kacl);
static inline int ima_inode_remove_acl(struct user_namespace *mnt_userns,
static inline int ima_inode_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry,
const char *acl_name)
{
return ima_inode_set_acl(mnt_userns, dentry, acl_name, NULL);
return ima_inode_set_acl(idmap, dentry, acl_name, NULL);
}
extern int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name);
#else
@@ -217,7 +217,7 @@ static inline int ima_inode_setxattr(struct dentry *dentry,
return 0;
}
static inline int ima_inode_set_acl(struct user_namespace *mnt_userns,
static inline int ima_inode_set_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name,
struct posix_acl *kacl)
{
@@ -231,7 +231,7 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
return 0;
}
static inline int ima_inode_remove_acl(struct user_namespace *mnt_userns,
static inline int ima_inode_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry,
const char *acl_name)
{