From: Danilo Krummrich <dakr@kernel.org>
Date: Tue, 30 Jul 2024 18:49:41 +0000 (+0200)
Subject: mm: kvrealloc: disable KASAN when switching to vmalloc
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9ec3e87d94f8efd64f8181e44f6c3aec06557ee7;p=users%2Fjedix%2Flinux-maple.git

mm: kvrealloc: disable KASAN when switching to vmalloc

Disable KASAN accessibility checks when switching from a kmalloc buffer
to a vmalloc buffer.

Link: https://lkml.kernel.org/r/20240730185049.6244-2-dakr@kernel.org
Fixes: 923a26b4c679 ("mm: kvmalloc: align kvrealloc() with krealloc()")
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/util.c b/mm/util.c
index f4b1672e6b75f..d98833e45e7ca 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -753,7 +753,10 @@ void *kvrealloc_noprof(const void *p, size_t size, gfp_t flags)
 
 		if (p) {
 			/* We already know that `p` is not a vmalloc address. */
-			memcpy(n, p, ksize(p));
+			kasan_disable_current();
+			memcpy(n, kasan_reset_tag(p), ksize(p));
+			kasan_enable_current();
+
 			kfree(p);
 		}
 	}