mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-01-04 04:04:19 +00:00
Merge branch 'for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux
Pull coccinelle updates from Julia Lawall: "New semantic patches and semantic patch improvements from Denis Efremov" * 'for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux: coccinelle: api: filter out memdup_user definitions coccinelle: api: extend memdup_user rule with vmemdup_user() coccinelle: api: extend memdup_user transformation with GFP_USER coccinelle: api: add kzfree script coccinelle: misc: add array_size_dup script to detect missed overflow checks coccinelle: api/kstrdup: fix coccinelle position coccinelle: api: add device_attr_show script
This commit is contained in:
Linus Torvalds
commit
e3243e2a27
55
scripts/coccinelle/api/device_attr_show.cocci
Normal file
55
scripts/coccinelle/api/device_attr_show.cocci
Normal file
@ -0,0 +1,55 @@
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// SPDX-License-Identifier: GPL-2.0-only
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///
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/// From Documentation/filesystems/sysfs.txt:
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/// show() must not use snprintf() when formatting the value to be
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/// returned to user space. If you can guarantee that an overflow
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/// will never happen you can use sprintf() otherwise you must use
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/// scnprintf().
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///
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// Confidence: High
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// Copyright: (C) 2020 Denis Efremov ISPRAS
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// Options: --no-includes --include-headers
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//
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virtual report
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virtual org
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virtual context
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virtual patch
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@r depends on !patch@
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identifier show, dev, attr, buf;
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position p;
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@@
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ssize_t show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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<...
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* return snprintf@p(...);
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...>
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}
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@rp depends on patch@
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identifier show, dev, attr, buf;
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@@
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ssize_t show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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<...
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return
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- snprintf
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+ scnprintf
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(...);
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...>
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}
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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: use scnprintf or sprintf")
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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: use scnprintf or sprintf")
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@ -66,7 +66,7 @@ position p1,p2;
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* x = strlen(from) + 1;
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... when != \( x = E1 \| from = E1 \)
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* to = \(kmalloc@p1\|kzalloc@p2\)(x,flag);
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* to = \(kmalloc@p1\|kzalloc@p1\)(x,flag);
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... when != \(x = E2 \| from = E2 \| to = E2 \)
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if (to==NULL || ...) S
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... when != \(x = E3 \| from = E3 \| to = E3 \)
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101
scripts/coccinelle/api/kzfree.cocci
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101
scripts/coccinelle/api/kzfree.cocci
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@ -0,0 +1,101 @@
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// SPDX-License-Identifier: GPL-2.0-only
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///
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/// Use kzfree, kvfree_sensitive rather than memset or
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/// memzero_explicit followed by kfree
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///
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// Confidence: High
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// Copyright: (C) 2020 Denis Efremov ISPRAS
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// Options: --no-includes --include-headers
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//
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// Keywords: kzfree, kvfree_sensitive
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//
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virtual context
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virtual patch
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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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# kmalloc_oob_in_memset uses memset to explicitly trigger out-of-bounds access
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filter = frozenset(['kmalloc_oob_in_memset', 'kzfree', 'kvfree_sensitive'])
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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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@cond@
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position ok;
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@@
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if (...)
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\(memset@ok\|memzero_explicit@ok\)(...);
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@r depends on !patch forall@
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expression E;
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position p : script:python() { relevant(p) };
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position m != cond.ok;
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type T;
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@@
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(
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* memset@m((T)E, 0, ...);
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* memzero_explicit@m((T)E, ...);
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)
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... when != E
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when strict
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* \(kfree\|vfree\|kvfree\)(E)@p;
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@rp_memzero depends on patch@
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expression E, size;
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position p : script:python() { relevant(p) };
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position m != cond.ok;
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type T;
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@@
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- memzero_explicit@m((T)E, size);
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... when != E
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when strict
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// TODO: uncomment when kfree_sensitive will be merged.
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// Only this case is commented out because developers
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// may not like patches like this since kzfree uses memset
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// internally (not memzero_explicit).
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//(
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//- kfree(E)@p;
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//+ kfree_sensitive(E);
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//|
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- \(vfree\|kvfree\)(E)@p;
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+ kvfree_sensitive(E, size);
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//)
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@rp_memset depends on patch@
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expression E, size;
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position p : script:python() { relevant(p) };
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position m != cond.ok;
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type T;
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@@
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- memset@m((T)E, 0, size);
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... when != E
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when strict
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(
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- kfree(E)@p;
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+ kzfree(E);
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|
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- \(vfree\|kvfree\)(E)@p;
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+ kvfree_sensitive(E, size);
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)
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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],
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"WARNING: opportunity for kzfree/kvfree_sensitive")
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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],
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"WARNING: opportunity for kzfree/kvfree_sensitive")
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@ -15,12 +15,22 @@ 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 = \(kmalloc\|kzalloc\)(size,GFP_KERNEL);
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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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@ -37,13 +47,49 @@ identifier l1,l2;
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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;
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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 = \(kmalloc@p\|kzalloc@p\)(size,GFP_KERNEL);
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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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@ -59,3 +105,15 @@ 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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209
scripts/coccinelle/misc/array_size_dup.cocci
Normal file
209
scripts/coccinelle/misc/array_size_dup.cocci
Normal file
@ -0,0 +1,209 @@
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// SPDX-License-Identifier: GPL-2.0-only
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///
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/// Check for array_size(), array3_size(), struct_size() duplicates.
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/// These patterns are detected:
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/// 1. An opencoded expression is used before array_size() to compute the same size
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/// 2. An opencoded expression is used after array_size() to compute the same size
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/// From security point of view only first case is relevant. These functions
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/// perform arithmetic overflow check. Thus, if we use an opencoded expression
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/// before a call to the *_size() function we can miss an overflow.
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///
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// Confidence: High
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// Copyright: (C) 2020 Denis Efremov ISPRAS
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||||
// Options: --no-includes --include-headers --no-loops
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virtual context
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virtual report
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virtual org
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@as@
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expression E1, E2;
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@@
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array_size(E1, E2)
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@as_next@
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expression subE1 <= as.E1;
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expression subE2 <= as.E2;
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expression as.E1, as.E2, E3;
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||||
assignment operator aop;
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||||
position p1, p2;
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@@
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||||
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* E1 * E2@p1
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||||
... when != \(subE1\|subE2\) aop E3
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||||
when != &\(subE1\|subE2\)
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* array_size(E1, E2)@p2
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@script:python depends on report@
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p1 << as_next.p1;
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p2 << as_next.p2;
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@@
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||||
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msg = "WARNING: array_size is used later (line %s) to compute the same size" % (p2[0].line)
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coccilib.report.print_report(p1[0], msg)
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|
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@script:python depends on org@
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p1 << as_next.p1;
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p2 << as_next.p2;
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@@
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||||
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msg = "WARNING: array_size is used later (line %s) to compute the same size" % (p2[0].line)
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coccilib.org.print_todo(p1[0], msg)
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|
||||
@as_prev@
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||||
expression subE1 <= as.E1;
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||||
expression subE2 <= as.E2;
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||||
expression as.E1, as.E2, E3;
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assignment operator aop;
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||||
position p1, p2;
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@@
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||||
|
||||
* array_size(E1, E2)@p1
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||||
... when != \(subE1\|subE2\) aop E3
|
||||
when != &\(subE1\|subE2\)
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||||
* E1 * E2@p2
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||||
|
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@script:python depends on report@
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p1 << as_prev.p1;
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p2 << as_prev.p2;
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@@
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|
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msg = "WARNING: array_size is already used (line %s) to compute the same size" % (p1[0].line)
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coccilib.report.print_report(p2[0], msg)
|
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|
||||
@script:python depends on org@
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p1 << as_prev.p1;
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p2 << as_prev.p2;
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@@
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|
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msg = "WARNING: array_size is already used (line %s) to compute the same size" % (p1[0].line)
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||||
coccilib.org.print_todo(p2[0], msg)
|
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|
||||
@as3@
|
||||
expression E1, E2, E3;
|
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@@
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||||
|
||||
array3_size(E1, E2, E3)
|
||||
|
||||
@as3_next@
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||||
expression subE1 <= as3.E1;
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||||
expression subE2 <= as3.E2;
|
||||
expression subE3 <= as3.E3;
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||||
expression as3.E1, as3.E2, as3.E3, E4;
|
||||
assignment operator aop;
|
||||
position p1, p2;
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||||
@@
|
||||
|
||||
* E1 * E2 * E3@p1
|
||||
... when != \(subE1\|subE2\|subE3\) aop E4
|
||||
when != &\(subE1\|subE2\|subE3\)
|
||||
* array3_size(E1, E2, E3)@p2
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||||
|
||||
@script:python depends on report@
|
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p1 << as3_next.p1;
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p2 << as3_next.p2;
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@@
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||||
|
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msg = "WARNING: array3_size is used later (line %s) to compute the same size" % (p2[0].line)
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||||
coccilib.report.print_report(p1[0], msg)
|
||||
|
||||
@script:python depends on org@
|
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p1 << as3_next.p1;
|
||||
p2 << as3_next.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: array3_size is used later (line %s) to compute the same size" % (p2[0].line)
|
||||
coccilib.org.print_todo(p1[0], msg)
|
||||
|
||||
@as3_prev@
|
||||
expression subE1 <= as3.E1;
|
||||
expression subE2 <= as3.E2;
|
||||
expression subE3 <= as3.E3;
|
||||
expression as3.E1, as3.E2, as3.E3, E4;
|
||||
assignment operator aop;
|
||||
position p1, p2;
|
||||
@@
|
||||
|
||||
* array3_size(E1, E2, E3)@p1
|
||||
... when != \(subE1\|subE2\|subE3\) aop E4
|
||||
when != &\(subE1\|subE2\|subE3\)
|
||||
* E1 * E2 * E3@p2
|
||||
|
||||
@script:python depends on report@
|
||||
p1 << as3_prev.p1;
|
||||
p2 << as3_prev.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: array3_size is already used (line %s) to compute the same size" % (p1[0].line)
|
||||
coccilib.report.print_report(p2[0], msg)
|
||||
|
||||
@script:python depends on org@
|
||||
p1 << as3_prev.p1;
|
||||
p2 << as3_prev.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: array3_size is already used (line %s) to compute the same size" % (p1[0].line)
|
||||
coccilib.org.print_todo(p2[0], msg)
|
||||
|
||||
@ss@
|
||||
expression E1, E2, E3;
|
||||
@@
|
||||
|
||||
struct_size(E1, E2, E3)
|
||||
|
||||
@ss_next@
|
||||
expression subE3 <= ss.E3;
|
||||
expression ss.E1, ss.E2, ss.E3, E4;
|
||||
assignment operator aop;
|
||||
position p1, p2;
|
||||
@@
|
||||
|
||||
* E1 * E2 + E3@p1
|
||||
... when != subE3 aop E4
|
||||
when != &subE3
|
||||
* struct_size(E1, E2, E3)@p2
|
||||
|
||||
@script:python depends on report@
|
||||
p1 << ss_next.p1;
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||||
p2 << ss_next.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: struct_size is used later (line %s) to compute the same size" % (p2[0].line)
|
||||
coccilib.report.print_report(p1[0], msg)
|
||||
|
||||
@script:python depends on org@
|
||||
p1 << ss_next.p1;
|
||||
p2 << ss_next.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: struct_size is used later (line %s) to compute the same size" % (p2[0].line)
|
||||
coccilib.org.print_todo(p1[0], msg)
|
||||
|
||||
@ss_prev@
|
||||
expression subE3 <= ss.E3;
|
||||
expression ss.E1, ss.E2, ss.E3, E4;
|
||||
assignment operator aop;
|
||||
position p1, p2;
|
||||
@@
|
||||
|
||||
* struct_size(E1, E2, E3)@p1
|
||||
... when != subE3 aop E4
|
||||
when != &subE3
|
||||
* E1 * E2 + E3@p2
|
||||
|
||||
@script:python depends on report@
|
||||
p1 << ss_prev.p1;
|
||||
p2 << ss_prev.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: struct_size is already used (line %s) to compute the same size" % (p1[0].line)
|
||||
coccilib.report.print_report(p2[0], msg)
|
||||
|
||||
@script:python depends on org@
|
||||
p1 << ss_prev.p1;
|
||||
p2 << ss_prev.p2;
|
||||
@@
|
||||
|
||||
msg = "WARNING: struct_size is already used (line %s) to compute the same size" % (p1[0].line)
|
||||
coccilib.org.print_todo(p2[0], msg)
|
||||
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