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authorPeter Zijlstra <peterz@infradead.org>2021-11-05 13:39:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-06 13:30:36 -0700
commitbd1a8fb2d43f7c293383f76691d7a55f7f89d9da (patch)
treefeb4ca9f9bfcb52dcba1a30a009ec0fb8479f2b8
parent228f778e973035185232ae745be0e3bc57dacea6 (diff)
mm/vmalloc: don't allow VM_NO_GUARD on vmap()
The vmalloc guard pages are added on top of each allocation, thereby isolating any two allocations from one another. The top guard of the lower allocation is the bottom guard guard of the higher allocation etc. Therefore VM_NO_GUARD is dangerous; it breaks the basic premise of isolating separate allocations. There are only two in-tree users of this flag, neither of which use it through the exported interface. Ensure it stays this way. Link: https://lkml.kernel.org/r/YUMfdA36fuyZ+/xt@hirez.programming.kicks-ass.net Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Will Deacon <will@kernel.org> Acked-by: Kees Cook <keescook@chromium.org> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/vmalloc.h2
-rw-r--r--mm/vmalloc.c7
2 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 0ed56fc10c11..6e022cc712e6 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -22,7 +22,7 @@ struct notifier_block; /* in notifier.h */
#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
#define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */
#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
-#define VM_NO_GUARD 0x00000040 /* don't add guard page */
+#define VM_NO_GUARD 0x00000040 /* ***DANGEROUS*** don't add guard page */
#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
#define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */
#define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index f43c88fa08cf..4a11abd9e70f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2743,6 +2743,13 @@ void *vmap(struct page **pages, unsigned int count,
might_sleep();
+ /*
+ * Your top guard is someone else's bottom guard. Not having a top
+ * guard compromises someone else's mappings too.
+ */
+ if (WARN_ON_ONCE(flags & VM_NO_GUARD))
+ flags &= ~VM_NO_GUARD;
+
if (count > totalram_pages())
return NULL;