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[v1,10/16] khwasan, mm: perform untagged pointers comparison in krealloc

Message ID 94f6719e7e696977de00354f8201581a8f9108d3.1525798754.git.andreyknvl@google.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrey Konovalov May 8, 2018, 5:20 p.m. UTC 
The krealloc function checks where the same buffer was reused or a new one
allocated by comparing kernel pointers. KHWASAN changes memory tag on the
krealloc'ed chunk of memory and therefore also changes the pointer tag of
the returned pointer. Therefore we need to perform comparison on untagged
(with tags reset) pointers to check whether it's the same memory region or
not.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 mm/slab_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 0582004351c4..451b094b8c5b 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1478,7 +1478,7 @@  void *krealloc(const void *p, size_t new_size, gfp_t flags)
 	}
 
 	ret = __do_krealloc(p, new_size, flags);
-	if (ret && p != ret)
+	if (ret && khwasan_reset_tag(p) != khwasan_reset_tag(ret))
 		kfree(p);
 
 	return ret;