linux-kernel - Re: [PATCH] kasan, scs: collect stack traces from shadow stack

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Message-ID: <CA+fCnZekEu705yAX85wsCQeN21rk0tgS8ib6V8jrH_AscubbBA@mail.gmail.com>
Date:   Sun, 20 Mar 2022 22:09:37 +0100
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     andrey.konovalov@...ux.dev, Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH] kasan, scs: collect stack traces from shadow stack

On Mon, Mar 14, 2022 at 8:17 AM Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> > +static unsigned int save_shadow_stack(unsigned long *entries,
> > +                                     unsigned int nr_entries)
> > +{
> > +       unsigned long *scs_sp = task_scs_sp(current);
> > +       unsigned long *scs_base = task_scs(current);
>
> Just to double-check: interrupt frames are also appended to the the
> current task buffer, right?

Looked into this and found a few issues, will fix in v2. Interrupt
frames will be collected then.