linux-kernel - [PATCH v2 01/24] lib/test_vmalloc.c: use vmalloc

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Date:   Tue, 27 Jun 2023 16:43:16 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, keescook@...omium.org,
        christophe.jaillet@...adoo.fr, kuba@...nel.org
Subject: [PATCH v2 01/24] lib/test_vmalloc.c: use vmalloc_array and vcalloc

Use vmalloc_array and vcalloc to protect against
multiplication overflows.

The changes were done using the following Coccinelle
semantic patch:

// <smpl>
@initialize:ocaml@
@@

let rename alloc =
  match alloc with
    "vmalloc" -> "vmalloc_array"
  | "vzalloc" -> "vcalloc"
  | _ -> failwith "unknown"

@@
    size_t e1,e2;
    constant C1, C2;
    expression E1, E2, COUNT, x1, x2, x3;
    typedef u8;
    typedef __u8;
    type t = {u8,__u8,char,unsigned char};
    identifier alloc = {vmalloc,vzalloc};
    fresh identifier realloc = script:ocaml(alloc) { rename alloc };
@@

(
      alloc(x1*x2*x3)
|
      alloc(C1 * C2)
|
      alloc((sizeof(t)) * (COUNT), ...)
|
-     alloc((e1) * (e2))
+     realloc(e1, e2)
|
-     alloc((e1) * (COUNT))
+     realloc(COUNT, e1)
|
-     alloc((E1) * (E2))
+     realloc(E1, E2)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
v2: Use vmalloc_array and vcalloc instead of array_size.
This also leaves a multiplication of a constant by a sizeof
as is.  Two patches are thus dropped from the series.

 lib/test_vmalloc.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff -u -p a/lib/test_vmalloc.c b/lib/test_vmalloc.c
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -156,7 +156,7 @@ static int random_size_alloc_test(void)
 
 	for (i = 0; i < test_loop_count; i++) {
 		n = get_random_u32_inclusive(1, 100);
-		p = vmalloc(n * PAGE_SIZE);
+		p = vmalloc_array(n, PAGE_SIZE);
 
 		if (!p)
 			return -1;
@@ -221,11 +221,11 @@ static int full_fit_alloc_test(void)
 	junk_length = fls(num_online_cpus());
 	junk_length *= (32 * 1024 * 1024 / PAGE_SIZE);
 
-	ptr = vmalloc(sizeof(void *) * junk_length);
+	ptr = vmalloc_array(junk_length, sizeof(void *));
 	if (!ptr)
 		return rv;
 
-	junk_ptr = vmalloc(sizeof(void *) * junk_length);
+	junk_ptr = vmalloc_array(junk_length, sizeof(void *));
 	if (!junk_ptr) {
 		vfree(ptr);
 		return rv;
@@ -271,7 +271,8 @@ static int fix_size_alloc_test(void)
 		if (use_huge)
 			ptr = vmalloc_huge((nr_pages > 0 ? nr_pages:1) * PAGE_SIZE, GFP_KERNEL);
 		else
-			ptr = vmalloc((nr_pages > 0 ? nr_pages:1) * PAGE_SIZE);
+			ptr = vmalloc_array(nr_pages > 0 ? nr_pages : 1,
+					    PAGE_SIZE);
 
 		if (!ptr)
 			return -1;