From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CB8A33CD0; Wed, 20 Mar 2024 08:20:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710922849; cv=none; b=tjR/kvtTttpQ5hnLRH+e8x16rPFXuy8lVokxADKx+CN+vjSYzERTUuSk3s28Y7cvMZekgnVKvPe5etTYS7bfdGwV7H2+t93icX7TDJxwLw2EnBFSNAwZU8u7rPHiWVTYTNx3ecSQkLqgGlECeMayZDmMksm27qIdIh4c4/PyDFY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710922849; c=relaxed/simple; bh=azsICJZ26uVyLu/xZxYBLurT38mAkc6uUCquI0A4F0k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=AKzbZrl+LZBNNaDQhGg7kMdJeisEonPIhRQVatr/RK9GW8kVVvs42k/m7zV1SQxY7LSlybzMPWq8zLQzHNMIhi8rzhV4jP4N571JpPb/1QnX5emmwpvBweQfqgkY7eDKDilbA7Knx70psiP0vvXg/48qEFHfgViQR8EcFYVlJRw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=eZLO8H6H; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="eZLO8H6H" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=azsICJZ26uVyLu/xZxYBLurT38mAkc6uUCquI0A4F0k=; b=eZLO8H6HdxjZL/u3sCYSfKeyGL Re118rHAWTjzs2WPbGV3QNRaFbvmbtjjWh3G35krMklSzApIIXa3r7ALvjjEaCGlRdnMFKE8EMwRM xp1Q0JTnoyBeTVRBLtJddGYNaKYNzsW73XDcovv0fxuvz2XHo98iCqeuh3SWHO4dhtUiWQ4LHF6HQ Ie0pQcjzVwCpjbSm/mZq87Nu0wIaIcm/0gsgbeAXCthLZP2Bya6l9RNmUvpDACvhBG+WXCebJl8LP sWD7L/X0sCT8Rsq0ay5JQOy5Qec8FOOpwQm6ThSrnYeSOM4WC/sPnD4jLlKOfDlDj0yFIp4jXn5tk b1B+uY9A==; Received: from [2001:8b0:10b:5:8879:b0f0:4282:ed8] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmrBl-00000003slP-0HG0; Wed, 20 Mar 2024 08:20:45 +0000 Message-ID: Subject: Re: [PATCH 2/3] KVM: Check validity of offset+length of gfn_to_pfn_cache prior to activation From: David Woodhouse To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+106a4f72b0474e1d1b33@syzkaller.appspotmail.com, Paul Durrant Date: Wed, 20 Mar 2024 08:20:44 +0000 In-Reply-To: <20240320001542.3203871-3-seanjc@google.com> References: <20240320001542.3203871-1-seanjc@google.com> <20240320001542.3203871-3-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-QEiVCk/haAVwdnCBACZm" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-QEiVCk/haAVwdnCBACZm Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-03-19 at 17:15 -0700, Sean Christopherson wrote: > When activating a gfn_to_pfn_cache, verify that the offset+length is sane > and usable before marking the cache active.=C2=A0 Letting __kvm_gpc_refre= sh() > detect the problem results in a cache being marked active without setting > the GPA (or any other fields), which in turn results in KVM trying to > refresh a cache with INVALID_GPA. >=20 > Attempting to refresh a cache with INVALID_GPA isn't functionally > problematic, but it runs afoul of the sanity check that exactly one of > GPA or userspace HVA is valid, i.e. that a cache is either GPA-based or > HVA-based. >=20 > Reported-by: syzbot+106a4f72b0474e1d1b33@syzkaller.appspotmail.com > Closes: https://lore.kernel.org/all/0000000000005fa5cc0613f1cebd@google.c= om > Fixes: 721f5b0dda78 ("KVM: pfncache: allow a cache to be activated with a= fixed (userspace) HVA") Reviewed-by: David Woodhouse --=-QEiVCk/haAVwdnCBACZm Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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