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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a7dc9ec4875sm452370766b.191.2024.08.05.06.46.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Aug 2024 06:46:35 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 223aee22-5331-11ef-bc03-fd08da9f4363 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1722865596; x=1723470396; darn=lists.xenproject.org; h=content-transfer-encoding:autocrypt:subject:from:cc:to :content-language:user-agent:mime-version:date:message-id:from:to:cc :subject:date:message-id:reply-to; bh=He/VNCUucT/Fwk6jTYK47AImSamRG/7DWHnSj9sWCVw=; b=KDoeMq7vxjkajdYcWIsLfZnHzhauV2ORSZmhUOjcPkmwEQBObUPSmCFKAq4YwCn/wH x6+3M8+0gReSYVYP/POzmnLp5JZrTBk+ge0rwIJXofqC4emN/tq0Mv+oabejbGjfsZPt 5TaDxKaSBow2PPl3gxzSBfAcAJHRFYVcK0Xn1W9RYVIDcaTKKQuVMw1rzDEslzXzSUJN y9Zx0mVBOBzLY6MqR75hlRCmK8OwXrszWdddpjGOXqsKtguZOWj2tuWIhkdRnoyv/FvR k7KcQJo6OUZ37tbor5mDyoB/1izZe+sZdl4GyooEnkO+OZ6Q4epETP+3Hr2STRZwfzih Q4ag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722865596; x=1723470396; h=content-transfer-encoding:autocrypt:subject:from:cc:to :content-language:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=He/VNCUucT/Fwk6jTYK47AImSamRG/7DWHnSj9sWCVw=; b=vEIaGA7+NE+Is/ARG75fdx1k9zeKYDqe9eSVuf48rZt9VeCNJghRB0iD5+XNoYZmXV EOEaeR94UEynWcvPtKoDBOZpJ0nY/ROt0zjMwkQHbDUtz3lI68VG3W0PEPlYw7W5TlcP plGHrOLQYl2SEVqqs+N/PwG9d3rsoX1pzgDvhywEt8+Wqn0DJxXEGFgfyxwZH1bt9tDb ftAm/aYVc3hx7EQ+orK0TFT2NsMKv/Y64o9TKQ5pe65kKkUwHqCvyz7aCfHoZIbUjQS1 01KCcoZ1BGXS8smX6qecojcBtBPd46fcOSDluLPjy/ESdiT0eCKpS+5ITU28Env1PUTF ginw== X-Gm-Message-State: AOJu0Yya1s+1TKzNnI32y7KYGDdXva5JXvlR+geQX+uj/Fci+ffKrdkD 9wU7xtLK1DD9gtOx4Vv87vWsD8JHSHL6NPX752QMlzOtQic5x+AD31kaayd7NGCnohXuQupjAms = X-Google-Smtp-Source: AGHT+IGy9jZ7RLTGmvjzn0RBpgGWrPBiXl/l3d9ErdNVjjA70cR6cjXQkd6yFekvTpn3cmZdM8ccGQ== X-Received: by 2002:a05:6512:3a6:b0:530:d088:2348 with SMTP id 2adb3069b0e04-530d09aac9dmr1316004e87.54.1722865595714; Mon, 05 Aug 2024 06:46:35 -0700 (PDT) Message-ID: <9f73c7bd-4aa3-4a66-a12c-4bfda6aa233a@suse.com> Date: Mon, 5 Aug 2024 15:46:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= From: Jan Beulich Subject: [PATCH] x86emul: avoid UB shift in AVX512 VPMOV* handling Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1722865630795116600 Content-Type: text/plain; charset="utf-8" For widening and narrowing moves, operand (vector) size is calculated from a table. This calculation, for the AVX512 cases, lives ahead of validation of EVEX.L'L (which cannot be 3 without raising #UD). Account for the later checking by adjusting the constants in the expression such that even EVEX.L'L =3D=3D 3 will yield a non-UB shift (read: shift count reliably >=3D 0). Fixes: 3988beb08 ("x86emul: support AVX512{F,BW} zero- and sign-extending m= oves") Oss-fuzz: 70914 Signed-off-by: Jan Beulich Reviewed-by: Stefano Stabellini --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -5788,7 +5788,7 @@ x86_emulate( d =3D DstMem | SrcReg | TwoOp; } generate_exception_if(evex.brs, X86_EXC_UD); - op_bytes =3D 32 >> (pmov_convert_delta[b & 7] + 1 - evex.lr); + op_bytes =3D 64 >> (pmov_convert_delta[b & 7] + 2 - evex.lr); elem_bytes =3D (b & 7) < 3 ? 1 : (b & 7) !=3D 5 ? 2 : 4; goto avx512f_no_sae;