| Message ID | 20230119100226.789506-2-hch@lst.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [01/10] vmalloc: reject vmap with VM_FLUSH_RESET_PERMS | expand |
On Thu, Jan 19, 2023 at 11:02:17AM +0100, Christoph Hellwig wrote: > 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@lst.de> > --- > 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 > Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com> -- Uladzislau Rezki
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.
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@lst.de> --- mm/vmalloc.c | 3 +++ 1 file changed, 3 insertions(+)