linux-kernel - [PATCH v2 ] nitro_enclaves: Use get_user_pages

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Date:   Mon, 20 Dec 2021 19:58:56 +0000
From:   Andra Paraschiv <andraprs@...zon.com>
To:     linux-kernel <linux-kernel@...r.kernel.org>
CC:     Alexandru Ciobotaru <alcioa@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        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>,
        "Andra Paraschiv" <andraprs@...zon.com>
Subject: [PATCH v2 ] nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert

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

Use get_user_pages_unlocked() when setting the enclave memory regions.
That's a similar pattern as mmap_read_lock() used together with
get_user_pages().

Fixes: 5b78ed24e8ec ("mm/pagemap: add mmap_assert_locked() annotations to find_vma*()")
Signed-off-by: Andra Paraschiv <andraprs@...zon.com>
Cc: stable@...r.kernel.org
---
Changelog

v1 -> v2

* Update the commit message to include the reference to the commit
  that added the mmap_assert_locked() annotations to find_vma*().
* Use get_user_pages_unlocked() instead of get_user_pages(), that has
  a similar pattern as mmap_read_lock() + get_user_pages().
---
 drivers/virt/nitro_enclaves/ne_misc_dev.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c
index 8939612ee0e0..6894ccb868a6 100644
--- a/drivers/virt/nitro_enclaves/ne_misc_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
@@ -886,8 +886,9 @@ static int ne_set_user_memory_region_ioctl(struct ne_enclave *ne_enclave,
 			goto put_pages;
 		}
 
-		gup_rc = get_user_pages(mem_region.userspace_addr + memory_size, 1, FOLL_GET,
-					ne_mem_region->pages + i, NULL);
+		gup_rc = get_user_pages_unlocked(mem_region.userspace_addr + memory_size, 1,
+						 ne_mem_region->pages + i, FOLL_GET);
+
 		if (gup_rc < 0) {
 			rc = gup_rc;
 
-- 
2.32.0




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