From nobody Sun Feb 8 06:05:30 2026 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (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 CD9522BEC44 for ; Wed, 8 Oct 2025 04:09:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759896578; cv=none; b=OVTgFobBrPPjsmENsQUXRmJZmflr81tdXTYo/gOUd/JD+5Ovo35PHwgtFXNwOY/wOcmoDn9BVFv0F/1Fviv6OhSQG9WseHuRsGHMoay3PFnHPKmvbTJuF357TKB25MXj5ULlZbBXTLmffglngrd1LPnj9ObBTg76JPz1muFOwGo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759896578; c=relaxed/simple; bh=BFgmjXhlqUfV9g5aZf0Fpbp8t42vT5eiICIa6HmsPns=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=dN5elcuneUD7GAB7kRzAis/amDHau/RhQAZrflAGSw1iB9NcmGDfsiUDyHLkA5EZuk1KcGA5vDDgxo5IjBuoHf8lpQbBV7Nx/KkXPtUuc6YzriJ1aOkdhvCUmnMH7wmEK1b5vmOVBhXvesui+pzkCbI0WfRpjcZK9RZuqIbjXKk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fb.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=fb.com header.i=@fb.com header.b=BtfM/lav; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fb.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fb.com header.i=@fb.com header.b="BtfM/lav" Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 5982rAJU2065805 for ; Tue, 7 Oct 2025 21:09:35 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=s2048-2025-q2; bh=Zp9koOgnd/LMXr9KpmioHND3MH+op8celO7bHBPPISE=; b=BtfM/lavktxy 6ByZiGRWpmHIaO06iWfyRY6UvPGSactOPkpexKHZckBg+wgQHzwo9nXcfcqrWakG cTRH5oliHyzoqlycwf+DJSrpg6CDgUur0oIZ3YPcu29AT0mq+hfdD2fai8ovr3zj Vak1mZY4pR2+Bpr+QdKevnaJlqyB0o//JYWRS4bjHzOkbLgsgmwxrX898qanDWku w+priJpn16EOsj5dqz0ngln67WrxiheLxWjflVpLT69RrX3/qTabEAtPFYtyNS1+ zEFh6QfrxOf7NJbxMXbsgZ2B+NB3Sfx0bsdQuVPS6hf3y81w+uCsRwPqyJ/vg6Bv FTAuyaj99A== Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 49n7jxuhyy-7 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 07 Oct 2025 21:09:35 -0700 (PDT) Received: from twshared76339.05.prn6.facebook.com (2620:10d:c0a8:1b::30) by mail.thefacebook.com (2620:10d:c0a9:6f::8fd4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.20; Wed, 8 Oct 2025 04:09:33 +0000 Received: by devgpu015.cco6.facebook.com (Postfix, from userid 199522) id B17FAD26CCE; Tue, 7 Oct 2025 21:09:19 -0700 (PDT) From: Alex Mastro Date: Tue, 7 Oct 2025 21:08:46 -0700 Subject: [PATCH v2 1/3] vfio/type1: sanitize for overflow using check_*_overflow Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20251007-fix-unmap-v2-1-759bceb9792e@fb.com> References: <20251007-fix-unmap-v2-0-759bceb9792e@fb.com> In-Reply-To: <20251007-fix-unmap-v2-0-759bceb9792e@fb.com> To: Alex Williamson CC: Jason Gunthorpe , Alejandro Jimenez , , , Alex Mastro X-Mailer: b4 0.13.0 X-FB-Internal: Safe X-Proofpoint-GUID: Ty2nKLoC4ohYlIApsS98xSffNbZpbICH X-Proofpoint-ORIG-GUID: Ty2nKLoC4ohYlIApsS98xSffNbZpbICH X-Authority-Analysis: v=2.4 cv=LJdrgZW9 c=1 sm=1 tr=0 ts=68e5e3ff cx=c_pps a=MfjaFnPeirRr97d5FC5oHw==:117 a=MfjaFnPeirRr97d5FC5oHw==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=FOH2dFAWAAAA:8 a=J-xk3WMZyPGmlAw7FewA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDA4MDAyNCBTYWx0ZWRfX2l4JMp6rG8sl CSB2CGfncIWIcX3MrQHvJvV27fEI8zwaiegNdF0wVOTNLHlbGdJAR72BKqr9JxDM2Ck8JK8zgyr ByZaFaVQ4wh1C0cR6KMjFB7juT0BMNibUZb/FYoVgmOPN9tjEJ/H2IfiI4BoizKSyHrxHN2Dug/ UuVgSgFwHBtZ4xcPgc8hHlSYiA9c7huHcS2JhUAOPNE53SVKQ44FldTaFaA7FQdcCczrB7THCMM XS/uVSxQiece8GgaNCk2rjErb364gG7TokyUehSw2FsqUK2B17HlSNxS6SS2Cr3e4TpT5iwLeMz yTTKM0kgp58Vx3DiIyiKPcmxtKd3fFQJ/GwlfUdYPVHYesF9L4/Av6ZryQr1PM+2JCco+E92iZs C28aS/AHCoRjIlSrhagasT7GZjmdWw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-07_02,2025-10-06_01,2025-03-28_01 Adopt check_*_overflow functions to clearly express overflow check intent. Signed-off-by: Alex Mastro --- drivers/vfio/vfio_iommu_type1.c | 54 ++++++++++++++++++++++++++++++++-----= ---- 1 file changed, 43 insertions(+), 11 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type= 1.c index f8d68fe77b41..b510ef3f397b 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -37,6 +37,7 @@ #include #include #include +#include #include "vfio.h" =20 #define DRIVER_VERSION "0.2" @@ -825,14 +826,25 @@ static int vfio_iommu_type1_pin_pages(void *iommu_dat= a, unsigned long remote_vaddr; struct vfio_dma *dma; bool do_accounting; + dma_addr_t iova_end; + size_t iova_size; =20 - if (!iommu || !pages) + if (!iommu || !pages || npage < 0) return -EINVAL; =20 /* Supported for v2 version only */ if (!iommu->v2) return -EACCES; =20 + if (npage =3D=3D 0) + return 0; + + if (check_mul_overflow(npage, PAGE_SIZE, &iova_size)) + return -EINVAL; + + if (check_add_overflow(user_iova, iova_size - 1, &iova_end)) + return -EINVAL; + mutex_lock(&iommu->lock); =20 if (WARN_ONCE(iommu->vaddr_invalid_count, @@ -938,12 +950,23 @@ static void vfio_iommu_type1_unpin_pages(void *iommu_= data, { struct vfio_iommu *iommu =3D iommu_data; bool do_accounting; + dma_addr_t iova_end; + size_t iova_size; int i; =20 /* Supported for v2 version only */ if (WARN_ON(!iommu->v2)) return; =20 + if (WARN_ON(npage < 0) || npage =3D=3D 0) + return; + + if (WARN_ON(check_mul_overflow(npage, PAGE_SIZE, &iova_size))) + return; + + if (WARN_ON(check_add_overflow(user_iova, iova_size - 1, &iova_end))) + return; + mutex_lock(&iommu->lock); =20 do_accounting =3D list_empty(&iommu->domain_list); @@ -1304,6 +1327,7 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu, int ret =3D -EINVAL, retries =3D 0; unsigned long pgshift; dma_addr_t iova =3D unmap->iova; + dma_addr_t iova_end; u64 size =3D unmap->size; bool unmap_all =3D unmap->flags & VFIO_DMA_UNMAP_FLAG_ALL; bool invalidate_vaddr =3D unmap->flags & VFIO_DMA_UNMAP_FLAG_VADDR; @@ -1328,7 +1352,8 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu, goto unlock; size =3D U64_MAX; } else if (!size || size & (pgsize - 1) || - iova + size - 1 < iova || size > SIZE_MAX) { + check_add_overflow(iova, size - 1, &iova_end) || + size > SIZE_MAX) { goto unlock; } =20 @@ -1376,7 +1401,7 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu, if (dma && dma->iova !=3D iova) goto unlock; =20 - dma =3D vfio_find_dma(iommu, iova + size - 1, 0); + dma =3D vfio_find_dma(iommu, iova_end, 0); if (dma && dma->iova + dma->size !=3D iova + size) goto unlock; } @@ -1578,7 +1603,9 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, { bool set_vaddr =3D map->flags & VFIO_DMA_MAP_FLAG_VADDR; dma_addr_t iova =3D map->iova; + dma_addr_t iova_end; unsigned long vaddr =3D map->vaddr; + unsigned long vaddr_end; size_t size =3D map->size; int ret =3D 0, prot =3D 0; size_t pgsize; @@ -1588,6 +1615,12 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, if (map->size !=3D size || map->vaddr !=3D vaddr || map->iova !=3D iova) return -EINVAL; =20 + if (check_add_overflow(iova, size - 1, &iova_end)) + return -EINVAL; + + if (check_add_overflow(vaddr, size - 1, &vaddr_end)) + return -EINVAL; + /* READ/WRITE from device perspective */ if (map->flags & VFIO_DMA_MAP_FLAG_WRITE) prot |=3D IOMMU_WRITE; @@ -1608,12 +1641,6 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, goto out_unlock; } =20 - /* Don't allow IOVA or virtual address wrap */ - if (iova + size - 1 < iova || vaddr + size - 1 < vaddr) { - ret =3D -EINVAL; - goto out_unlock; - } - dma =3D vfio_find_dma(iommu, iova, size); if (set_vaddr) { if (!dma) { @@ -1640,7 +1667,7 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, goto out_unlock; } =20 - if (!vfio_iommu_iova_dma_valid(iommu, iova, iova + size - 1)) { + if (!vfio_iommu_iova_dma_valid(iommu, iova, iova_end)) { ret =3D -EINVAL; goto out_unlock; } @@ -2908,6 +2935,7 @@ static int vfio_iommu_type1_dirty_pages(struct vfio_i= ommu *iommu, unsigned long pgshift; size_t data_size =3D dirty.argsz - minsz; size_t iommu_pgsize; + dma_addr_t range_end; =20 if (!data_size || data_size < sizeof(range)) return -EINVAL; @@ -2916,8 +2944,12 @@ static int vfio_iommu_type1_dirty_pages(struct vfio_= iommu *iommu, sizeof(range))) return -EFAULT; =20 - if (range.iova + range.size < range.iova) + if (range.size =3D=3D 0) + return 0; + + if (check_add_overflow(range.iova, range.size - 1, &range_end)) return -EINVAL; + if (!access_ok((void __user *)range.bitmap.data, range.bitmap.size)) return -EINVAL; --=20 2.47.3