linux-kernel - Re: [PATCH] capability: test_deny_namespace breakage due to capability conversion to u64

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Date:   Fri, 24 Mar 2023 12:48:53 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Sasha Levin <sashal@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>, bpf <bpf@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] capability: test_deny_namespace breakage due to
 capability conversion to u64

On Fri, Mar 24, 2023 at 9:49 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Fri, Mar 24, 2023 at 5:36 AM Sasha Levin <sashal@...nel.org> wrote:
> >
> > Commit f122a08b197d ("capability: just use a 'u64' instead of a 'u32[2]'
> > array") attempts to use BIT_LL() but actually wanted to use BIT_ULL(),
> > fix it up to make the test compile and run again.

It would only fix the compilation error, but the test would still fail.

> This got fixed differently by e8c8361cfdbf ("selftests/bpf: Fix
> progs/test_deny_namespace.c issues").

exactly. It's not just the macro that had to be adjusted.

> I wonder what drugs made me think BIT_LL() was ok. Maybe my wife puts
> something in the coffee?

$ make C=2 kernel/bpf/core.o
kernel/bpf/core.c:1822:43: error: arithmetics on pointers to functions
kernel/bpf/core.c:1827:48: error: arithmetics on pointers to functions
kernel/bpf/core.c:2073:77: error: subtraction of functions? Share your drugs

:)