cifs: Retain old ACEs when converting between mode bits and ACL.

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When cifsacl mount option is used, retain the ACEs which
should not be modified during chmod. Following is the approach taken:

1. Retain all explicit (non-inherited) ACEs, unless the SID is one
of owner/group/everyone/authenticated-users. We're going to set new
ACEs for these SIDs anyways.
2. At the end of the list of explicit ACEs, place the new list of
ACEs obtained by necessary conversion/encoding.
3. Once the converted/encoded ACEs are set, copy all the remaining
ACEs (inherited) into the new ACL.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

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Shyam Prasad N 2021-02-12 04:38:43 -08:00 • committed by Steve French

parent c12ead71e8

commit f506550889

1 changed files with 223 additions and 47 deletions

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fs/cifs/cifsacl.c

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