linux-kernel - Re: [PATCH v6 2/4] x86/tests: Add tests for AMD SEV-ES #VC handling Add KUnit based tests to validate Linux's VC handling for instructions cpuid and wbinvd. These tests: 1. install a kretprobe on the #VC handler (sev_es_ghcb_hv_call, to access GHCB before/after the resulting VMGEXIT). 2. trigger an NAE by executing either cpuid or wbinvd. 3. check that the kretprobe was hit with the right exit

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 for Android: free password hash cracker in your pocket

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

Date:   Wed, 8 Jun 2022 10:50:06 +0200
From:   Vasant Karasulli <vkarasulli@...e.de>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, jroedel@...e.de, kvm@...r.kernel.org,
        bp@...en8.de, x86@...nel.org, thomas.lendacky@....com
Subject: Re: [PATCH v6 2/4] x86/tests: Add tests for AMD SEV-ES #VC handling
 Add KUnit based tests to validate Linux's VC handling for instructions cpuid
 and wbinvd. These tests: 1. install a kretprobe on the #VC handler
 (sev_es_ghcb_hv_call, to access GHCB before/after the resulting VMGEXIT). 2.
 trigger an NAE by executing either cpuid or wbinvd. 3. check that the
 kretprobe was hit with the right exit_code available in GHCB.

On Mi 06-04-22 01:22:55, Sean Christopherson wrote:
> > +	if (ret) {
> > +		kunit_info(test, "Could not register kretprobe. Skipping.");
> > +		goto out;
> > +	}
> > +
> > +	test->priv = kunit_kzalloc(test, sizeof(u64), GFP_KERNEL);
>
> Allocating 8 bytes and storing the pointer an 8-byte field is rather pointless :-)
>

Actually it's necessary to allocate memory to test->priv before using according to
https://www.kernel.org/doc/html/latest/dev-tools/kunit/tips.html

> > +	if (!test->priv) {
> > +		ret = -ENOMEM;
> > +		kunit_info(test, "Could not allocate. Skipping.");
> > +		goto out;
> > +	}
> > +

--
Vasant Karasulli
Kernel generalist
www.suse.com<http://www.suse.com>
[https://www.suse.com/assets/img/social-platforms-suse-logo.png]<http://www.suse.com/>
SUSE - Open Source Solutions for Enterprise Servers & Cloud<http://www.suse.com/>
Modernize your infrastructure with SUSE Linux Enterprise servers, cloud technology for IaaS, and SUSE's software-defined storage.
www.suse.com