From: Christoph Hellwig <hch@lst.de>
To: Andrew Morton <akpm@linux-foundation.org>,
Uladzislau Rezki <urezki@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Dmitry Vyukov <dvyukov@google.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
kasan-dev@googlegroups.com, linux-mm@kvack.org
Subject: [PATCH 01/10] mm: reject vmap with VM_FLUSH_RESET_PERMS
Date: Sat, 21 Jan 2023 08:10:42 +0100 [thread overview]
Message-ID: <20230121071051.1143058-2-hch@lst.de> (raw)
In-Reply-To: <20230121071051.1143058-1-hch@lst.de>
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>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
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
next prev parent reply other threads:[~2023-01-21 7:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-21 7:10 cleanup vfree and vunmap Christoph Hellwig
2023-01-21 7:10 ` Christoph Hellwig [this message]
2023-01-23 10:34 ` [PATCH 01/10] mm: reject vmap with VM_FLUSH_RESET_PERMS David Hildenbrand
2023-01-21 7:10 ` [PATCH 02/10] mm: remove __vfree Christoph Hellwig
2023-01-23 10:35 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 03/10] mm: remove __vfree_deferred Christoph Hellwig
2023-01-23 10:37 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 04/10] mm: move vmalloc_init and free_work down in vmalloc.c Christoph Hellwig
2023-01-23 10:37 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 05/10] mm: call vfree instead of __vunmap from delayed_vfree_work Christoph Hellwig
2023-01-23 10:38 ` David Hildenbrand
2023-01-23 14:43 ` Christoph Hellwig
2023-01-21 7:10 ` [PATCH 06/10] mm: move __remove_vm_area out of va_remove_mappings Christoph Hellwig
2023-01-23 10:40 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 07/10] mm: use remove_vm_area in __vunmap Christoph Hellwig
2023-01-23 10:42 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 08/10] mm: move debug checks from __vunmap to remove_vm_area Christoph Hellwig
2023-01-23 10:43 ` David Hildenbrand
2023-01-23 14:50 ` Christoph Hellwig
2023-01-23 14:52 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 09/10] mm: split __vunmap Christoph Hellwig
2023-01-23 10:47 ` David Hildenbrand
2023-01-21 7:10 ` [PATCH 10/10] mm: refactor va_remove_mappings Christoph Hellwig
2023-01-23 10:52 ` David Hildenbrand
2023-01-22 1:20 ` cleanup vfree and vunmap Andrew Morton
2023-01-22 7:20 ` Christoph Hellwig
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