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authorChristoph Hellwig <hch@lst.de>2019-07-17 02:26:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-17 05:23:21 +0300
commit0bf5f9492389aa8df5c8e38fcb4488802d24504d (patch)
tree9c62b75ac595ca7dd1c0e25261c9a1ad08fb69f0 /mm
parentc633324e311243586675e732249339685e5d6faa (diff)
downloadlinux-0bf5f9492389aa8df5c8e38fcb4488802d24504d.tar.xz
mm: fix the MAP_UNINITIALIZED flag
We can't expose UAPI symbols differently based on CONFIG_ symbols, as userspace won't have them available. Instead always define the flag, but only respect it based on the config option. Link: http://lkml.kernel.org/r/20190703122359.18200-2-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/nommu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index eb3e2e558da1..fed1b6e9c89b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1261,7 +1261,9 @@ unsigned long do_mmap(struct file *file,
add_nommu_region(region);
/* clear anonymous mappings that don't ask for uninitialized data */
- if (!vma->vm_file && !(flags & MAP_UNINITIALIZED))
+ if (!vma->vm_file &&
+ (!IS_ENABLED(CONFIG_MMAP_ALLOW_UNINITIALIZED) ||
+ !(flags & MAP_UNINITIALIZED)))
memset((void *)region->vm_start, 0,
region->vm_end - region->vm_start);