linux-kernel - Re: [PATCH v1 ] nitro_enclaves: Add mmap_read_lock() for the get_user

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Date:   Mon, 3 Jan 2022 17:03:37 +0200
From:   "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To:     linux-kernel <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     Alexandru Ciobotaru <alcioa@...zon.com>,
        Alexandru Vasile <lexnv@...zon.com>,
        Marcelo Cerri <marcelo.cerri@...onical.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Tim Gardner <tim.gardner@...onical.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        kvm <kvm@...r.kernel.org>,
        ne-devel-upstream <ne-devel-upstream@...zon.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH v1 ] nitro_enclaves: Add mmap_read_lock() for the get_user_pages() call



On 18.12.2021 12:43, Paraschiv, Andra-Irina wrote:
> 
> 
> On 18.12.2021 12:35, Andra Paraschiv wrote:
>> After commit 5b78ed24e8ec (mm/pagemap: add mmap_assert_locked()
>> annotations to find_vma*()), the call to get_user_pages() will trigger
>> the mmap assert.
>>
>> static inline void mmap_assert_locked(struct mm_struct *mm)
>> {
>>     lockdep_assert_held(&mm->mmap_lock);
>>     VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
>> }
>>
>> [   62.521410] kernel BUG at include/linux/mmap_lock.h:156!
>> ...........................................................
>> [   62.538938] RIP: 0010:find_vma+0x32/0x80
>> ...........................................................
>> [   62.605889] Call Trace:
>> [   62.608502]  <TASK>
>> [   62.610956]  ? lock_timer_base+0x61/0x80
>> [   62.614106]  find_extend_vma+0x19/0x80
>> [   62.617195]  __get_user_pages+0x9b/0x6a0
>> [   62.620356]  __gup_longterm_locked+0x42d/0x450
>> [   62.623721]  ? finish_wait+0x41/0x80
>> [   62.626748]  ? __kmalloc+0x178/0x2f0
>> [   62.629768]  ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 
>> [nitro_enclaves]
>> [   62.635776]  ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves]
>> [   62.639541]  __x64_sys_ioctl+0x82/0xb0
>> [   62.642620]  do_syscall_64+0x3b/0x90
>> [   62.645642]  entry_SYSCALL_64_after_hwframe+0x44/0xae
>>
>> Add mmap_read_lock() for the get_user_pages() call when setting the
>> enclave memory regions.
>>
>> Signed-off-by: Andra Paraschiv <andraprs@...zon.com>
>> Cc: stable@...r.kernel.org
>> ---
> 
> Greg, can you please include this fix in the queue for v5.16 and then in 
> the one for the v5.15 stable tree. Let me know if any updates are 
> necessary for the patch.
> 

Thank you, Greg, for helping with the merge of v2 for this patch.

Andra

> 
>>   drivers/virt/nitro_enclaves/ne_misc_dev.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c 
>> b/drivers/virt/nitro_enclaves/ne_misc_dev.c
>> index 8939612ee0e0..6c51ff024036 100644
>> --- a/drivers/virt/nitro_enclaves/ne_misc_dev.c
>> +++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
>> @@ -886,8 +886,13 @@ static int ne_set_user_memory_region_ioctl(struct 
>> ne_enclave *ne_enclave,
>>               goto put_pages;
>>           }
>> +        mmap_read_lock(current->mm);
>> +
>>           gup_rc = get_user_pages(mem_region.userspace_addr + 
>> memory_size, 1, FOLL_GET,
>>                       ne_mem_region->pages + i, NULL);
>> +
>> +        mmap_read_unlock(current->mm);
>> +
>>           if (gup_rc < 0) {
>>               rc = gup_rc;



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