[PATCH RFC 11/15] LSM: Infrastructure management of the mnt_opts security blob

[Paul Moore]

On Jun 21, 2025 Casey Schaufler <casey at schaufler-ca.com> wrote:
> 
> Move management of the mnt_opts->security blob out of the
> individual security modules and into the security
> infrastructure. Blobs are still allocated within the modules
> as they are only required when mount options are present.
> The modules tell the infrastructure how much space is required,
> and the space is allocated if needed. Modules can no longer
> count on the presence of a blob implying that mount options
> specific to that module are present, so flags are added
> to the module specific blobs to indicate that this module
> has options.
> 
> Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
> ---
>  security/security.c        | 14 ++++-----
>  security/selinux/hooks.c   | 58 +++++++++++++++++++++++-------------
>  security/smack/smack_lsm.c | 61 ++++++++++++++++++++++++++------------
>  3 files changed, 85 insertions(+), 48 deletions(-)

We discussed this patch in a separate patchset, lore link below.

https://lore.kernel.org/linux-security-module/20250925171208.5997-1-casey@schaufler-ca.com/

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