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119 lines
2.6 KiB
Text
119 lines
2.6 KiB
Text
// SPDX-License-Identifier: GPL-2.0-only
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/// Use memdup_user rather than duplicating its implementation
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/// This is a little bit restricted to reduce false positives
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///
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// Confidence: High
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// Copyright: (C) 2010-2012 Nicolas Palix.
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// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.
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// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.
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// URL: https://coccinelle.gitlabpages.inria.fr/website
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// Comments:
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// Options: --no-includes --include-headers
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virtual patch
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virtual context
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virtual org
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virtual report
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@initialize:python@
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@@
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filter = frozenset(['memdup_user', 'vmemdup_user'])
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def relevant(p):
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return not (filter & {el.current_element for el in p})
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@depends on patch@
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expression from,to,size;
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identifier l1,l2;
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position p : script:python() { relevant(p) };
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@@
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- to = \(kmalloc@p\|kzalloc@p\)
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- (size,\(GFP_KERNEL\|GFP_USER\|
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- \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
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+ to = memdup_user(from,size);
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if (
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- to==NULL
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+ IS_ERR(to)
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|| ...) {
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<+... when != goto l1;
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- -ENOMEM
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+ PTR_ERR(to)
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...+>
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}
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- if (copy_from_user(to, from, size) != 0) {
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- <+... when != goto l2;
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- -EFAULT
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- ...+>
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- }
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@depends on patch@
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expression from,to,size;
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identifier l1,l2;
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position p : script:python() { relevant(p) };
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@@
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- to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
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+ to = vmemdup_user(from,size);
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if (
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- to==NULL
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+ IS_ERR(to)
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|| ...) {
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<+... when != goto l1;
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- -ENOMEM
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+ PTR_ERR(to)
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...+>
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}
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- if (copy_from_user(to, from, size) != 0) {
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- <+... when != goto l2;
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- -EFAULT
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- ...+>
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- }
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@r depends on !patch@
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expression from,to,size;
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position p : script:python() { relevant(p) };
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statement S1,S2;
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@@
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* to = \(kmalloc@p\|kzalloc@p\)
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(size,\(GFP_KERNEL\|GFP_USER\|
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\(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
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if (to==NULL || ...) S1
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if (copy_from_user(to, from, size) != 0)
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S2
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@rv depends on !patch@
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expression from,to,size;
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position p : script:python() { relevant(p) };
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statement S1,S2;
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@@
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* to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
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if (to==NULL || ...) S1
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if (copy_from_user(to, from, size) != 0)
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S2
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@script:python depends on org@
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p << r.p;
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@@
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coccilib.org.print_todo(p[0], "WARNING opportunity for memdup_user")
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@script:python depends on report@
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p << r.p;
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@@
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coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")
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@script:python depends on org@
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p << rv.p;
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@@
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coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")
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@script:python depends on report@
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p << rv.p;
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@@
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coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
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