[PATCH v1 ] nitro_enclaves: Add mmap_read_lock() for the get_user_pages() call

[Andra Paraschiv <andraprs@amazon.com>]

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@amazon.com>
Cc: stable@vger.kernel.org
---
 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;
 
-- 
2.32.0




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