linux-kernel - [PATCH 1/2] Coccinelle: extend memdup_user transformation with GFP

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Date:   Sat, 30 May 2020 23:53:47 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Julia Lawall <Julia.Lawall@...6.fr>, Joe Perches <joe@...ches.com>
Cc:     Denis Efremov <efremov@...ux.com>, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] Coccinelle: extend memdup_user transformation with GFP_USER

Match GFP_USER allocations with memdup_user.cocci rule.
Commit 6c2c97a24f09 ("memdup_user(): switch to GFP_USER") switched
memdup_user() from GFP_KERNEL to GFP_USER. In most cases it is still
a good idea to use memdup_user() for GFP_KERNEL allocations. The
motivation behind altering memdup_user() to GFP_USER is here:
https://lkml.org/lkml/2018/1/6/333

Signed-off-by: Denis Efremov <efremov@...ux.com>
---
 scripts/coccinelle/api/memdup_user.cocci | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index c809ab10bbce..49f487e6a5c8 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -20,7 +20,7 @@ expression from,to,size;
 identifier l1,l2;
 @@
 
--  to = \(kmalloc\|kzalloc\)(size,GFP_KERNEL);
+-  to = \(kmalloc\|kzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
 +  to = memdup_user(from,size);
    if (
 -      to==NULL
@@ -43,7 +43,7 @@ position p;
 statement S1,S2;
 @@
 
-*  to = \(kmalloc@p\|kzalloc@p\)(size,GFP_KERNEL);
+*  to = \(kmalloc@p\|kzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
    if (to==NULL || ...) S1
    if (copy_from_user(to, from, size) != 0)
    S2
-- 
2.26.2