[PATCH v9 16/25] security: Introduce inode_post_set_acl hook
Paul Moore
paul at paul-moore.com
Thu Feb 8 03:18:47 UTC 2024
On Jan 15, 2024 Roberto Sassu <roberto.sassu at huaweicloud.com> wrote:
>
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the inode_post_set_acl hook.
>
> At inode_set_acl hook, EVM verifies the file's existing HMAC value. At
> inode_post_set_acl, EVM re-calculates the file's HMAC based on the modified
> POSIX ACL and other file metadata.
>
> Other LSMs could similarly take some action after successful POSIX ACL
> change.
>
> The new hook cannot return an error and cannot cause the operation to be
> reverted.
>
> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
> Reviewed-by: Stefan Berger <stefanb at linux.ibm.com>
> Acked-by: Casey Schaufler <casey at schaufler-ca.com>
> Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>
> ---
> fs/posix_acl.c | 1 +
> include/linux/lsm_hook_defs.h | 2 ++
> include/linux/security.h | 7 +++++++
> security/security.c | 17 +++++++++++++++++
> 4 files changed, 27 insertions(+)
Acked-by: Paul Moore <paul at paul-moore.com>
--
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