linux-kernel - Re: [PATCH v12 07/22] selftests/vm: fixed bugs in pkey_disable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Wed, 28 Mar 2018 20:51:42 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Ram Pai <linuxram@...ibm.com>, shuahkh@....samsung.com,
        linux-kselftest@...r.kernel.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org, x86@...nel.org,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        akpm@...ux-foundation.org, benh@...nel.crashing.org,
        paulus@...ba.org, khandual@...ux.vnet.ibm.com,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com,
        hbabu@...ibm.com, mhocko@...nel.org, ebiederm@...ssion.com,
        arnd@...db.de
Subject: Re: [PATCH v12 07/22] selftests/vm: fixed bugs in pkey_disable_clear()


Dave Hansen <dave.hansen@...el.com> writes:

> On 03/28/2018 01:47 PM, Thiago Jung Bauermann wrote:
>>>>  	if (flags)
>>>> -		assert(rdpkey_reg() > orig_pkey_reg);
>>>> +		assert(rdpkey_reg() < orig_pkey_reg);
>>>>  }
>>>>
>>>>  void pkey_write_allow(int pkey)
>>> This seems so horribly wrong that I wonder how it worked in the first
>>> place.  Any idea?
>> The code simply wasn't used. pkey_disable_clear() is called by
>> pkey_write_allow() and pkey_access_allow(), but before this patch series
>> nothing called either of these functions.
>> 
>
> Ahh, that explains it.  Can that get stuck in the changelog, please?

Yes, will be in the next version.

-- 
Thiago Jung Bauermann
IBM Linux Technology Center