Re: [RFC PATCH 2/2] SELinux: cache inode checks inside structinode

From: Linus Torvalds
Date: Mon Jun 03 2013 - 17:32:27 EST

On Mon, 3 Jun 2013, Eric Paris wrote:
> + seqcount_t i_security_seqcount;
> + u32 i_last_task_sid;
> + u32 i_last_granting;
> + u32 i_last_perms;
> + u32 i_audit_allow;
> void *i_security;
> #endif

This is much too big. I was really hoping for "another word that the
security layer can use" or similar.

Something this big would be acceptable if it would be a *generic* security
cache, and others could use it too, and would avoid ever actually calling
into any security layer at all (ie we could do the checks entirely at the
VFS layer). Then it would be fine. But for just the fact that SELinux is
too slow? No.

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