From patchwork Wed Jun 7 16:30:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ekansh Gupta X-Patchwork-Id: 691477 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27473C7EE23 for ; Wed, 7 Jun 2023 16:31:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231624AbjFGQbQ (ORCPT ); Wed, 7 Jun 2023 12:31:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232152AbjFGQbH (ORCPT ); Wed, 7 Jun 2023 12:31:07 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B2B2526A4; Wed, 7 Jun 2023 09:30:46 -0700 (PDT) Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 357Eral2014182; Wed, 7 Jun 2023 16:30:27 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=crJnwFdMcicgcZCckmfie44U2n+CsIGh9YorMoL7IOw=; b=VvKP1gIAym3rnbPkIfAQCrhG8PeS4vbJ6oGDRR71XMhWT5Pkxb8D9oAd4d/pS8YNtS6d Ai/+zZOx+oJjNJYErDEZcl4hTt9e5+Hpl9mcdX8Ui0pDg8wXFcBZM0hJ3T8AnQTtVStp JnUWdkZfEh3shRYohhX12wjF5RLVOmdpkX3g60TfBm+X0TTC+g4SD9klTQu3TtYtLV7e KQAI8+TzMLxS57FGBxQSTb8vw0BduTxfogsKM3dc1nE8mkgVgWWtzcig4LhPQMHlDOlo qFByE9cT+RNplplpQazPAtYOzXyFenrIwIWhuFP+KBjwfEmsDSc23MlN/KFQOjEt9Oe7 5w== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3r2a9tjas1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 07 Jun 2023 16:30:27 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 357GUQHQ032238 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 7 Jun 2023 16:30:26 GMT Received: from ekangupt-linux.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.42; Wed, 7 Jun 2023 09:30:21 -0700 From: Ekansh Gupta To: , CC: Ekansh Gupta , , , , , , , , , , , Subject: [RESEND PATCH v1 2/2] misc: fastrpc: detect privileged processes based on group ID Date: Wed, 7 Jun 2023 22:00:07 +0530 Message-ID: <1686155407-20054-3-git-send-email-quic_ekangupt@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1686155407-20054-1-git-send-email-quic_ekangupt@quicinc.com> References: <1686155407-20054-1-git-send-email-quic_ekangupt@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: ZVoFn-k8-6jhZ0U6NmmNALIUbJ1M2Vmb X-Proofpoint-ORIG-GUID: ZVoFn-k8-6jhZ0U6NmmNALIUbJ1M2Vmb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-07_07,2023-06-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 adultscore=0 impostorscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 phishscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306070140 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Get the information on privileged group IDs during rpmsg probing based on DT property. Check if the process requesting an offload to remote subsystem is privileged by comparing it's group ID with privileged group ID. Initialization process attributes are updated for a privileged process which is sent to remote process for resource management. Signed-off-by: Ekansh Gupta --- drivers/misc/fastrpc.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 30d4d04..6c7db0b 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -21,6 +21,7 @@ #include #include #include +#include #define ADSP_DOMAIN_ID (0) #define MDSP_DOMAIN_ID (1) @@ -166,6 +167,11 @@ struct fastrpc_mem_unmap_req_msg { u64 len; }; +struct gid_list { + u32 *gids; + u32 gidcount; +}; + struct fastrpc_msg { int pid; /* process group id */ int tid; /* thread id */ @@ -277,6 +283,7 @@ struct fastrpc_channel_ctx { struct fastrpc_device *fdevice; struct fastrpc_buf *remote_heap; struct list_head invoke_interrupted_mmaps; + struct gid_list gidlist; bool secure; bool unsigned_support; u64 dma_mask; @@ -305,6 +312,7 @@ struct fastrpc_user { spinlock_t lock; /* lock for allocations */ struct mutex mutex; + struct gid_list gidlist; }; static void fastrpc_free_map(struct kref *ref) @@ -522,6 +530,31 @@ static void fastrpc_context_put_wq(struct work_struct *work) } #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1) + +static u32 sorted_lists_intersection(u32 *listA, + u32 lenA, u32 *listB, u32 lenB) +{ + u32 i = 0, j = 0; + + while (i < lenA && j < lenB) { + if (listA[i] < listB[j]) + i++; + else if (listA[i] > listB[j]) + j++; + else + return listA[i]; + } + return 0; +} + +static int uint_cmp_func(const void *p1, const void *p2) +{ + u32 a1 = *((u32 *)p1); + u32 a2 = *((u32 *)p2); + + return CMP(a1, a2); +} + static int olaps_cmp(const void *a, const void *b) { struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a; @@ -1230,6 +1263,50 @@ static bool is_session_rejected(struct fastrpc_user *fl, bool unsigned_pd_reques return false; } +static int fastrpc_get_process_gids(struct gid_list *gidlist) +{ + struct group_info *group_info = get_current_groups(); + int i, num_gids; + u32 *gids = NULL; + + if (!group_info) + return -EFAULT; + + num_gids = group_info->ngroups + 1; + gids = kcalloc(num_gids, sizeof(u32), GFP_KERNEL); + if (!gids) + return -ENOMEM; + + /* Get the real GID */ + gids[0] = __kgid_val(current_gid()); + + /* Get the supplemental GIDs */ + for (i = 1; i < num_gids; i++) + gids[i] = __kgid_val(group_info->gid[i - 1]); + + sort(gids, num_gids, sizeof(*gids), uint_cmp_func, NULL); + gidlist->gids = gids; + gidlist->gidcount = num_gids; + + return 0; +} + +static void fastrpc_check_privileged_process(struct fastrpc_user *fl, + struct fastrpc_init_create *init) +{ + u32 gid = sorted_lists_intersection(fl->gidlist.gids, + fl->gidlist.gidcount, fl->cctx->gidlist.gids, + fl->cctx->gidlist.gidcount); + + /* disregard any privilege bits from userspace */ + init->attrs &= (~FASTRPC_MODE_PRIVILEGED); + if (gid) { + dev_info(&fl->cctx->rpdev->dev, "%s: %s (PID %d, GID %u) is a privileged process\n", + __func__, current->comm, fl->tgid, gid); + init->attrs |= FASTRPC_MODE_PRIVILEGED; + } +} + static int fastrpc_init_create_static_process(struct fastrpc_user *fl, char __user *argp) { @@ -1386,6 +1463,8 @@ static int fastrpc_init_create_process(struct fastrpc_user *fl, goto err; } + fastrpc_get_process_gids(&fl->gidlist); + inbuf.pgid = fl->tgid; inbuf.namelen = strlen(current->comm) + 1; inbuf.filelen = init.filelen; @@ -1400,6 +1479,8 @@ static int fastrpc_init_create_process(struct fastrpc_user *fl, goto err; } + fastrpc_check_privileged_process(fl, &init); + memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4), 1024 * 1024); err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen, @@ -1519,6 +1600,7 @@ static int fastrpc_device_release(struct inode *inode, struct file *file) spin_lock_irqsave(&cctx->lock, flags); list_del(&fl->user); spin_unlock_irqrestore(&cctx->lock, flags); + kfree(fl->gidlist.gids); if (fl->init_mem) fastrpc_buf_free(fl->init_mem); @@ -2118,6 +2200,43 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd, return err; } +static int fastrpc_init_privileged_gids(struct device *dev, char *prop_name, + struct gid_list *gidlist) +{ + int err = 0; + u32 len = 0, i; + u32 *gids = NULL; + + if (!of_find_property(dev->of_node, prop_name, &len)) + return 0; + if (len == 0) + return 0; + + len /= sizeof(u32); + gids = kcalloc(len, sizeof(u32), GFP_KERNEL); + if (!gids) + return -ENOMEM; + + for (i = 0; i < len; i++) { + err = of_property_read_u32_index(dev->of_node, prop_name, + i, &gids[i]); + if (err) { + dev_err(dev, "%s: failed to read GID %u\n", + __func__, i); + goto read_error; + } + dev_info(dev, "adsprpc: %s: privileged GID: %u\n", __func__, gids[i]); + } + sort(gids, len, sizeof(*gids), uint_cmp_func, NULL); + gidlist->gids = gids; + gidlist->gidcount = len; + + return 0; +read_error: + kfree(gids); + return err; +} + static const struct file_operations fastrpc_fops = { .open = fastrpc_device_open, .release = fastrpc_device_release, @@ -2277,6 +2396,10 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) if (!data) return -ENOMEM; + err = fastrpc_init_privileged_gids(rdev, "qcom,fastrpc-gids", &data->gidlist); + if (err) + dev_err(rdev, "Privileged gids init failed.\n"); + if (vmcount) { data->vmcount = vmcount; data->perms = BIT(QCOM_SCM_VMID_HLOS); @@ -2382,6 +2505,7 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) if (cctx->remote_heap) fastrpc_buf_free(cctx->remote_heap); + kfree(cctx->gidlist.gids); of_platform_depopulate(&rpdev->dev); fastrpc_channel_ctx_put(cctx);