linux-kernel - Re: [PATCH v2 14/19] lib/stackdepot, kasan: add flags to __stack_depot

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Date:   Sat, 16 Sep 2023 01:42:19 +0200
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     andrey.konovalov@...ux.dev,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v2 14/19] lib/stackdepot, kasan: add flags to
 __stack_depot_save and rename

On Fri, Sep 15, 2023 at 10:32 PM Marco Elver <elver@...gle.com> wrote:
> > +depot_stack_handle_t stack_depot_save_flags(unsigned long *entries,
> > +                                           unsigned int nr_entries,
> > +                                           gfp_t alloc_flags,
> > +                                           depot_flags_t depot_flags)
> >  {
> >         struct list_head *bucket;
> >         struct stack_record *found = NULL;
> >         depot_stack_handle_t handle = 0;
> >         struct page *page = NULL;
> >         void *prealloc = NULL;
> > +       bool can_alloc = depot_flags & STACK_DEPOT_FLAG_CAN_ALLOC;
> >         bool need_alloc = false;
> >         unsigned long flags;
> >         u32 hash;
> >
> > +       if (depot_flags & ~STACK_DEPOT_FLAGS_MASK)
> > +               return 0;
> > +
>
> Shouldn't this be a WARN due to invalid flags?

Good idea! Will fix. Thanks!