[PATCH 5.15 63/73] nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert
From: Greg Kroah-Hartman
Date: Mon Jan 03 2022 - 09:39:02 EST
From: Andra Paraschiv <andraprs@xxxxxxxxxx>
commit 3a0152b219523227c2a62a0a122cf99608287176 upstream.
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*()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Andra Paraschiv <andraprs@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211220195856.6549-1-andraprs@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/virt/nitro_enclaves/ne_misc_dev.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- 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_ioc
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;