On Sat, Sep 05, 2015 at 12:27:18PM +0200, Andreas Gruenbacher wrote:
> Change the acl so that owner@ is granted the permissions set in the
> owner mask.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
> ---
> fs/richacl_compat.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
> index 9b76fc0..14a1b4b 100644
> --- a/fs/richacl_compat.c
> +++ b/fs/richacl_compat.c
> @@ -413,3 +413,49 @@ richacl_propagate_everyone(struct richacl_alloc *alloc)
> }
> return 0;
> }
> +
> +/**
> + * richacl_set_owner_permissions - set the owner permissions to the owner mask
> + *
> + * Change the acl so that owner@ is granted the permissions set in the owner
> + * mask. This leaves at most one efective owner@ allow entry at the beginning
> + * of the acl.
Perhaps also worth nothing here that it's a no-op in the !MASKED or
!WRITE_THROUGH cases and that this does not change the permissions that
the ACL grants. (The latter wasn't obvious to me at first.... But
this only modifies OWNER@ aces, and in the MASKED & WRITE_THROUGH case
modification of OWNER@ aces doesn't affect permissions.)
Anyway, code looks right to me:
Reviewed-by: J. Bruce Fields <bfields@xxxxxxxxxx>
--b.
> + */
> +static int
> +richacl_set_owner_permissions(struct richacl_alloc *alloc)
> +{
> + unsigned int x = RICHACE_POSIX_ALWAYS_ALLOWED;
> + unsigned int owner_mask = alloc->acl->a_owner_mask & ~x;
> + unsigned int denied = 0;
> + struct richace *ace;
> +
> + if (!((alloc->acl->a_flags & RICHACL_WRITE_THROUGH) &&
> + (alloc->acl->a_flags & RICHACL_MASKED)))
> + return 0;
> +
> + richacl_for_each_entry(ace, alloc->acl) {
> + if (richace_is_owner(ace)) {
> + if (richace_is_allow(ace) && !(owner_mask & denied)) {
> + richace_change_mask(alloc, &ace, owner_mask);
> + owner_mask = 0;
> + } else
> + richace_change_mask(alloc, &ace, 0);
> + } else {
> + if (richace_is_deny(ace))
> + denied |= ace->e_mask;
> + }
> + }
> +
> + if (owner_mask & (denied |
> + ~alloc->acl->a_other_mask |
> + ~alloc->acl->a_group_mask)) {
> + ace = alloc->acl->a_entries;
> + if (richacl_insert_entry(alloc, &ace))
> + return -1;
> + ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
> + ace->e_flags = RICHACE_SPECIAL_WHO;
> + ace->e_mask = owner_mask;
> + ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
> + }
> + return 0;
> +}
> --
> 2.4.3
>
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