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Coccinelle: add atomic_as_refcounter script

Browse Source 
atomic_as_refcounter.cocci script allows detecting
cases when refcount_t type and API should be used
instead of atomic_t.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Elena Reshetova 2017-09-01 12:40:20 +03:00 committed by Masahiro Yamada
parent 9d3cce1e8b
commit b56e535509
1 changed files with 129 additions and 0 deletions
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129
scripts/coccinelle/api/atomic_as_refcounter.cocci Normal file
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// Check if refcount_t type and API should be used
// instead of atomic_t type when dealing with refcounters
//
// Copyright (c) 2016-2017, Elena Reshetova, Intel Corporation
//
// Confidence: Moderate
// URL: http://coccinelle.lip6.fr/
// Options: --include-headers --very-quiet
virtual report
@r1 exists@
identifier a, x;
position p1, p2;
identifier fname =~ ".*free.*";
identifier fname2 =~ ".*destroy.*";
identifier fname3 =~ ".*del.*";
identifier fname4 =~ ".*queue_work.*";
identifier fname5 =~ ".*schedule_work.*";
identifier fname6 =~ ".*call_rcu.*";
@@
(
atomic_dec_and_test@p1(&(a)->x)
|
atomic_dec_and_lock@p1(&(a)->x, ...)
|
atomic_long_dec_and_lock@p1(&(a)->x, ...)
|
atomic_long_dec_and_test@p1(&(a)->x)
|
atomic64_dec_and_test@p1(&(a)->x)
|
local_dec_and_test@p1(&(a)->x)
)
...
(
fname@p2(a, ...);
|
fname2@p2(...);
|
fname3@p2(...);
|
fname4@p2(...);
|
fname5@p2(...);
|
fname6@p2(...);
)
@script:python depends on report@
p1 << r1.p1;
p2 << r1.p2;
@@
msg = "atomic_dec_and_test variation before object free at line %s."
coccilib.report.print_report(p1[0], msg % (p2[0].line))
@r4 exists@
identifier a, x, y;
position p1, p2;
identifier fname =~ ".*free.*";
@@
(
atomic_dec_and_test@p1(&(a)->x)
|
atomic_dec_and_lock@p1(&(a)->x, ...)
|
atomic_long_dec_and_lock@p1(&(a)->x, ...)
|
atomic_long_dec_and_test@p1(&(a)->x)
|
atomic64_dec_and_test@p1(&(a)->x)
|
local_dec_and_test@p1(&(a)->x)
)
...
y=a
...
fname@p2(y, ...);
@script:python depends on report@
p1 << r4.p1;
p2 << r4.p2;
@@
msg = "atomic_dec_and_test variation before object free at line %s."
coccilib.report.print_report(p1[0], msg % (p2[0].line))
@r2 exists@
identifier a, x;
position p1;
@@
(
atomic_add_unless(&(a)->x,-1,1)@p1
|
atomic_long_add_unless(&(a)->x,-1,1)@p1
|
atomic64_add_unless(&(a)->x,-1,1)@p1
)
@script:python depends on report@
p1 << r2.p1;
@@
msg = "atomic_add_unless"
coccilib.report.print_report(p1[0], msg)
@r3 exists@
identifier x;
position p1;
@@
(
x = atomic_add_return@p1(-1, ...);
|
x = atomic_long_add_return@p1(-1, ...);
|
x = atomic64_add_return@p1(-1, ...);
)
@script:python depends on report@
p1 << r3.p1;
@@
msg = "x = atomic_add_return(-1, ...)"
coccilib.report.print_report(p1[0], msg)