linux-kernel - Re: [PATCH] module: always complete idempotent loads

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Message-ID: <CAHk-=wgy2q9viwq-bAqaq8X_WQHNqDsu1AzfeYXAcDQRZmCoAw@mail.gmail.com>
Date:   Tue, 4 Jul 2023 06:37:32 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Vegard Nossum <vegard.nossum@...cle.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        George Kennedy <george.kennedy@...cle.com>,
        linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        syzbot+9c2bdc9d24e4a7abe741@...kaller.appspotmail.com,
        Johan Hovold <johan@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Rudi Heitbaum <rudi@...tbaum.com>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH] module: always complete idempotent loads

On Tue, 4 Jul 2023 at 03:09, Vegard Nossum <vegard.nossum@...cle.com> wrote:
>
> Commit 9b9879fc0327 added a hashtable storing lists of concurrent module
> loads. However, it didn't fix up all the error paths in
> init_module_from_file(); this would lead to leaving the function while an
> on-stack 'struct idempotent' element is still in the hash table, which
> leads to all sorts of badness as spotted by syzkaller:

You are of course 100% right.

However, I'd rather just use a wrapper function and make this thing
much clearer. Like I should have done originally.

So I'd be inclined towards a patch like the attached instead. Works for you?

                   Linus

View attachment "patch.diff" of type "text/x-patch" (2367 bytes)