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| author | Christian Brauner <brauner@kernel.org> | 2022-06-21 16:14:51 +0200 |
|---|---|---|
| committer | Christian Brauner (Microsoft) <brauner@kernel.org> | 2022-06-26 18:18:55 +0200 |
| commit | 35faf3109a78516f60ca13f957083d5e5535fde0 (patch) | |
| tree | 50c3ddabd30c0007ea625af2368d38f962a7225a /security/integrity/evm/evm_main.c | |
| parent | 1f36146a5a3dc6098566d34a9886f9e97c88d93e (diff) | |
| download | lwn-35faf3109a78516f60ca13f957083d5e5535fde0.tar.gz lwn-35faf3109a78516f60ca13f957083d5e5535fde0.zip | |
fs: port to iattr ownership update helpers
Earlier we introduced new helpers to abstract ownership update and
remove code duplication. This converts all filesystems supporting
idmapped mounts to make use of these new helpers.
For now we always pass the initial idmapping which makes the idmapping
functions these helpers call nops.
This is done because we currently always pass the actual value to be
written to i_{g,u}id via struct iattr. While this allowed us to treat
the {g,u}id values in struct iattr as values that can be directly
written to inode->i_{g,u}id it also increases the potential for
confusion for filesystems.
Now that we are have dedicated types to prevent this confusion we will
ultimately only map the value from the idmapped mount into a filesystem
value that can be written to inode->i_{g,u}id when the filesystem
actually updates the inode. So pass down the initial idmapping until we
finished that conversion at which point we pass down the mount's
idmapping.
No functional changes intended.
Link: https://lore.kernel.org/r/20220621141454.2914719-6-brauner@kernel.org
Cc: Seth Forshee <sforshee@digitalocean.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
CC: linux-fsdevel@vger.kernel.org
Reviewed-by: Seth Forshee <sforshee@digitalocean.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Diffstat (limited to 'security/integrity/evm/evm_main.c')
| -rw-r--r-- | security/integrity/evm/evm_main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c index cc88f02c7562..bcde6bc2a2ce 100644 --- a/security/integrity/evm/evm_main.c +++ b/security/integrity/evm/evm_main.c @@ -760,8 +760,8 @@ static int evm_attr_change(struct dentry *dentry, struct iattr *attr) struct inode *inode = d_backing_inode(dentry); unsigned int ia_valid = attr->ia_valid; - if ((!(ia_valid & ATTR_UID) || uid_eq(attr->ia_uid, inode->i_uid)) && - (!(ia_valid & ATTR_GID) || gid_eq(attr->ia_gid, inode->i_gid)) && + if (!i_uid_needs_update(&init_user_ns, attr, inode) && + !i_gid_needs_update(&init_user_ns, attr, inode) && (!(ia_valid & ATTR_MODE) || attr->ia_mode == inode->i_mode)) return 0; |