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security: Introduce inode_post_remove_acl hook

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In preparation for moving IMA and EVM to the LSM infrastructure, introduce
the inode_post_remove_acl hook.

At inode_remove_acl hook, EVM verifies the file's existing HMAC value. At
inode_post_remove_acl, EVM re-calculates the file's HMAC with the passed
POSIX ACL removed and other file metadata.

Other LSMs could similarly take some action after successful POSIX ACL
removal.

The new hook cannot return an error and cannot cause the operation to be
reverted.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Roberto Sassu 2024-02-15 11:31:05 +01:00 committed by Paul Moore
parent 8b9d0b825c
commit 2d705d8024
4 changed files with 28 additions and 0 deletions
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1
fs/posix_acl.c
View file

@ -1246,6 +1246,7 @@ int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry,
error = -EIO;
if (!error) {
fsnotify_xattr(dentry);
security_inode_post_remove_acl(idmap, dentry, acl_name);
evm_inode_post_remove_acl(idmap, dentry, acl_name);
}

2
include/linux/lsm_hook_defs.h
View file

@ -163,6 +163,8 @@ LSM_HOOK(int, 0, inode_get_acl, struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
LSM_HOOK(int, 0, inode_remove_acl, struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
LSM_HOOK(void, LSM_RET_VOID, inode_post_remove_acl, struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
LSM_HOOK(int, 0, inode_need_killpriv, struct dentry *dentry)
LSM_HOOK(int, 0, inode_killpriv, struct mnt_idmap *idmap,
struct dentry *dentry)

8
include/linux/security.h
View file

@ -378,6 +378,9 @@ int security_inode_get_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name);
int security_inode_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name);
void security_inode_post_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry,
const char *acl_name);
void security_inode_post_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
int security_inode_getxattr(struct dentry *dentry, const char *name);
@ -936,6 +939,11 @@ static inline int security_inode_remove_acl(struct mnt_idmap *idmap,
return 0;
}
static inline void security_inode_post_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry,
const char *acl_name)
{ }
static inline void security_inode_post_setxattr(struct dentry *dentry,
const char *name, const void *value, size_t size, int flags)
{ }

17
security/security.c
View file

@ -2413,6 +2413,23 @@ int security_inode_remove_acl(struct mnt_idmap *idmap,
return evm_inode_remove_acl(idmap, dentry, acl_name);
}
/**
* security_inode_post_remove_acl() - Update inode security after rm posix acls
* @idmap: idmap of the mount
* @dentry: file
* @acl_name: acl name
*
* Update inode security data after successfully removing posix acls on
* @dentry in @idmap. The posix acls are identified by @acl_name.
*/
void security_inode_post_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(inode_post_remove_acl, idmap, dentry, acl_name);
}
/**
* security_inode_post_setxattr() - Update the inode after a setxattr operation
* @dentry: file