Re: [PATCH] ptrace: use fsuid, fsgid, effective creds for fs access checks

[Andrew Morton]

On Mon, 9 Nov 2015 22:12:09 +0100 Jann Horn <jann@xxxxxxxxx> wrote:
> 
> > Can we do
> > 
> > #define PTRACE_foo (PTRACE_MODE_READ|PTRACE_MODE_FSCREDS)
> > 
> > to avoid all that?
> 
> Hm. All combinations of the PTRACE_MODE_*CREDS flags with
> PTRACE_MODE_{READ,ATTACH} plus optionally PTRACE_MODE_NOAUDIT
> make sense, I think. So your suggestion would be to create
> four new #defines
> PTRACE_MODE_{READ,ATTACH}_{FSCREDS,REALCREDS} and then let
> callers OR in the PTRACE_MODE_NOAUDIT flag if needed?

If these flag combinations have an identifiable concept behind them then
sure, it makes sense to capture that via a well-chosen identifier.


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