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Two earlier bug fixes have created a security problem in the hfi1 driver. One fix aimed to solve an issue where current->mm was not valid when closing the hfi1 cdev. It attempted to do this by saving a cached value of the current->mm pointer at file open time. This is a problem if another process with access to the FD calls in via write() or ioctl() to pin pages via the hfi driver. The other fix tried to solve a use after free by taking a reference on the mm. To fix this correctly we use the existing cached value of the mm in the mmu notifier. Now we can check in the insert, evict, etc. routines that current->mm matched what the notifier was registered for. If not, then don't allow access. The register of the mmu notifier will save the mm pointer. Since in do_exit() the exit_mm() is called before exit_files(), which would call our close routine a reference is needed on the mm. We rely on the mmgrab done by the registration of the notifier, whereas before it was explicit. The mmu notifier deregistration happens when the user context is torn down, the creation of which triggered the registration. Also of note is we do not do any explicit work to protect the interval tree notifier. It doesn't seem that this is going to be needed since we aren't actually doing anything with current->mm. The interval tree notifier stuff still has a FIXME noted from a previous commit that will be addressed in a follow on patch. Cc: <stable@vger.kernel.org> Fixes:e0cf75deab("IB/hfi1: Fix mm_struct use after free") Fixes:3faa3d9a30("IB/hfi1: Make use of mm consistent") Link: https://lore.kernel.org/r/20201125210112.104301.51331.stgit@awfm-01.aw.intel.com Suggested-by: Jann Horn <jannh@google.com> Reported-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
#ifndef _HFI1_USER_EXP_RCV_H
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#define _HFI1_USER_EXP_RCV_H
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/*
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* Copyright(c) 2020 - Cornelis Networks, Inc.
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* Copyright(c) 2015 - 2017 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "hfi.h"
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#include "exp_rcv.h"
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struct tid_pageset {
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u16 idx;
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u16 count;
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};
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struct tid_user_buf {
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unsigned long vaddr;
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unsigned long length;
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unsigned int npages;
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struct page **pages;
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struct tid_pageset *psets;
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unsigned int n_psets;
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};
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struct tid_rb_node {
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struct mmu_interval_notifier notifier;
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struct hfi1_filedata *fdata;
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unsigned long phys;
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struct tid_group *grp;
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u32 rcventry;
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dma_addr_t dma_addr;
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bool freed;
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unsigned int npages;
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struct page *pages[];
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};
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static inline int num_user_pages(unsigned long addr,
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unsigned long len)
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{
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const unsigned long spage = addr & PAGE_MASK;
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const unsigned long epage = (addr + len - 1) & PAGE_MASK;
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return 1 + ((epage - spage) >> PAGE_SHIFT);
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}
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int hfi1_user_exp_rcv_init(struct hfi1_filedata *fd,
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struct hfi1_ctxtdata *uctxt);
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void hfi1_user_exp_rcv_free(struct hfi1_filedata *fd);
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int hfi1_user_exp_rcv_setup(struct hfi1_filedata *fd,
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struct hfi1_tid_info *tinfo);
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int hfi1_user_exp_rcv_clear(struct hfi1_filedata *fd,
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struct hfi1_tid_info *tinfo);
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int hfi1_user_exp_rcv_invalid(struct hfi1_filedata *fd,
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struct hfi1_tid_info *tinfo);
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static inline struct mm_struct *mm_from_tid_node(struct tid_rb_node *node)
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{
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return node->notifier.mm;
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}
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#endif /* _HFI1_USER_EXP_RCV_H */
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