Re: [PATCH v3 15/25] security: Introduce file_pre_free_security hook

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On 9/4/23 09:34, Roberto Sassu wrote:
From: Roberto Sassu <roberto.sassu@xxxxxxxxxx>

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

It is useful for IMA to calculate the digest of the file content, just
before a file descriptor is closed, and update the security.ima xattr with
the new value.

LSMs should use this hook instead of file_free_security, if they still need
to access the opened file, before it is closed. The new hook cannot return
an error and cannot cause the operation to be canceled.

Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>

Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>





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