[PATCH 01/10] vmalloc: reject vmap with VM_FLUSH_RESET_PERMS

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VM_FLUSH_RESET_PERMS is just for use with vmalloc as it is tied to freeing
the underlying pages.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 mm/vmalloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 0781c5a8e0e73d..6957d15d526e46 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2883,6 +2883,9 @@ void *vmap(struct page **pages, unsigned int count,
 
 	might_sleep();
 
+	if (WARN_ON_ONCE(flags & VM_FLUSH_RESET_PERMS))
+		return NULL;
+
 	/*
 	 * Your top guard is someone else's bottom guard. Not having a top
 	 * guard compromises someone else's mappings too.
-- 
2.39.0





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