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Date: Tue, 18 Feb 2020 10:21:47 +0800
From: zerons <zeronsaxm@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: Alexander Popov <alex.popov@...ux.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
kernel-hardening@...ts.openwall.com, Shawn <citypw@...denedlinux.org>,
spender@...ecurity.net
Subject: Re: Maybe inappropriate use BUG_ON() in CONFIG_SLAB_FREELIST_HARDENED
>
>>> In my opinion, this patch can somehow help attacker exploit this kind of bugs
>>> more reliable.
>
> Why do you think this makes races easier to win?
>
Sorry, not to make the races easier, but to make the exploitations
more reliable.
>> +Alexander Popov, who is the author of the double free check in
>> SLAB_FREELIST_HARDENED.
>>
>> Ah, so as long as the double free happens in a user process context,
>> you can retry triggering it until you succeed in winning the race to
>> reallocate the object (without causing slab freelist corruption, as it
>> would have had happened before SLAB_FREELIST_HARDENED). Nice idea!
>
> Do you see improvements that could be made here?
>
Could we use BUG_ON() only when panic_on_oops is set?
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