From: Denis Efremov <efremov@linux.com>
To: Julia Lawall <julia.lawall@inria.fr>
Cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org
Subject: [Cocci] [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
Date: Mon, 20 Jul 2020 19:22:15 +0300 [thread overview]
Message-ID: <20200720162216.13248-3-efremov@linux.com> (raw)
In-Reply-To: <20200720162216.13248-1-efremov@linux.com>
Add vmemdup_user() transformations to the memdup_user.cocci rule.
Commit 50fd2f298bef ("new primitive: vmemdup_user()") introduced
vmemdup_user(). The function uses kvmalloc with GPF_USER flag.
Signed-off-by: Denis Efremov <efremov@linux.com>
---
scripts/coccinelle/api/memdup_user.cocci | 45 ++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 0e29d41ecab8..60027e21c5e6 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -39,6 +39,28 @@ identifier l1,l2;
- ...+>
- }
+@depends on patch@
+expression from,to,size;
+identifier l1,l2;
+@@
+
+- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
++ to = vmemdup_user(from,size);
+ if (
+- to==NULL
++ IS_ERR(to)
+ || ...) {
+ <+... when != goto l1;
+- -ENOMEM
++ PTR_ERR(to)
+ ...+>
+ }
+- if (copy_from_user(to, from, size) != 0) {
+- <+... when != goto l2;
+- -EFAULT
+- ...+>
+- }
+
@r depends on !patch@
expression from,to,size;
position p;
@@ -52,6 +74,17 @@ statement S1,S2;
if (copy_from_user(to, from, size) != 0)
S2
+@rv depends on !patch@
+expression from,to,size;
+position p;
+statement S1,S2;
+@@
+
+* to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
+ if (to==NULL || ...) S1
+ if (copy_from_user(to, from, size) != 0)
+ S2
+
@script:python depends on org@
p << r.p;
@@
@@ -63,3 +96,15 @@ p << r.p;
@@
coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")
+
+@script:python depends on org@
+p << rv.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")
+
+@script:python depends on report@
+p << rv.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
--
2.26.2
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next prev parent reply other threads:[~2020-07-20 16:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-20 16:22 [Cocci] [PATCH v3 0/3] Update memdup_user.cocci Denis Efremov
2020-07-20 16:22 ` [Cocci] [PATCH v3 1/3] coccinelle: api: extend memdup_user transformation with GFP_USER Denis Efremov
2020-07-20 16:22 ` Denis Efremov [this message]
2020-07-20 16:22 ` [Cocci] [PATCH v3 3/3] coccinelle: api: filter out memdup_user definitions Denis Efremov
2020-07-24 20:02 ` [Cocci] [PATCH v3 0/3] Update memdup_user.cocci Julia Lawall
[not found] <e3d2ffb9-2a47-3d77-0501-9d48845435bd@web.de>
2020-07-21 9:58 ` [Cocci] [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user() Julia Lawall
[not found] ` <0b326e2b-723c-3482-c0ef-5d6592a9c6cb@web.de>
2020-07-22 6:02 ` Julia Lawall
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