lkml.org 
[lkml]   [2020]   [May]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
Date
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 | 49 +++++++++++++++++++++++-
1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 49f487e6a5c8..a50def35136e 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -37,6 +37,28 @@ 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;
@@ -48,14 +70,37 @@ statement S1,S2;
if (copy_from_user(to, from, size) != 0)
S2

-@script:python depends on org@
+@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 && r@
p << r.p;
@@

coccilib.org.print_todo(p[0], "WARNING opportunity for memdup_user")

-@script:python depends on report@
+@script:python depends on report && r@
p << r.p;
@@

coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")
+
+@script:python depends on org && rv@
+p << rv.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")
+
+@script:python depends on report && rv@
+p << rv.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
--
2.26.2
\
 
 \ /
  Last update: 2020-05-30 22:55    [W:0.108 / U:1.672 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site