mm: don't allow executable ioremap mappings

There is no need to execute from iomem (and most platforms it is
impossible anyway), so add the pgprot_nx() call similar to vmap.

Link: https://lkml.kernel.org/r/20210824091259.1324527-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index e44983f..3055f04 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -316,7 +316,7 @@ int ioremap_page_range(unsigned long addr, unsigned long end,
 {
        int err;
 
-       err = vmap_range_noflush(addr, end, phys_addr, prot,
+       err = vmap_range_noflush(addr, end, phys_addr, pgprot_nx(prot),
                                 ioremap_max_page_shift);
        flush_cache_vmap(addr, end);
        return err;