From: Jeff Xu <jeffxu@xxxxxxxxxxxx>
mmap(MAP_FIXED) should return EPERM when memory is sealed.
Fixes: 4205a39e06da ("mm/munmap: replace can_modify_mm with can_modify_vma")
Signed-off-by: Jeff Xu <jeffxu@xxxxxxxxxxxx>
---
mm/mmap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 80d70ed099cf..0cd0c0ef03c7 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1386,7 +1386,10 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
mt_on_stack(mt_detach);
mas_init(&mas_detach, &mt_detach, /* addr = */ 0);
/* Prepare to unmap any existing mapping in the area */
- if (vms_gather_munmap_vmas(&vms, &mas_detach))
+ error = vms_gather_munmap_vmas(&vms, &mas_detach);
+ if (error == -EPERM)
+ return -EPERM;
+ if (error)
return -ENOMEM;
vmg.next = vms.next;
--
2.46.0.295.g3b9ea8a38a-goog
