diff options
| author | Christoph Hellwig <hch@lst.de> | 2023-01-21 08:10:42 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:33:30 -0800 |
| commit | 37f3605e5e7af7de12aeb670c5b94e5a3c8dbf74 (patch) | |
| tree | 0b804ea9d5b3449fb35114c97548eed1984ec78e /mm/vmalloc.c | |
| parent | cfccd2e63e7e0c84c514676cffa755dd71a3b2bc (diff) | |
mm: reject vmap with VM_FLUSH_RESET_PERMS
Patch series "cleanup vfree and vunmap".
This little series untangles the vfree and vunmap code path a bit.
This patch (of 10):
VM_FLUSH_RESET_PERMS is just for use with vmalloc as it is tied to freeing
the underlying pages.
Link: https://lkml.kernel.org/r/20230121071051.1143058-1-hch@lst.de
Link: https://lkml.kernel.org/r/20230121071051.1143058-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/vmalloc.c')
| -rw-r--r-- | mm/vmalloc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 428e0bee5c9c..3f3cb4875966 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2868,6 +2868,9 @@ 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. |