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authorElena Reshetova <elena.reshetova@intel.com>2017-09-01 12:40:20 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-07-17 19:18:05 +0300
commitb56e5355091d799d58ce8b40fdf62dc9c2159981 (patch)
treeecd536928f09f92521341531ad606d1592a0a7e7 /scripts/coccinelle/api
parent9d3cce1e8b8561fed5f383d22a4d6949db4eadbe (diff)
downloadlinux-b56e5355091d799d58ce8b40fdf62dc9c2159981.tar.xz
Coccinelle: add atomic_as_refcounter script
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>
Diffstat (limited to 'scripts/coccinelle/api')
-rw-r--r--scripts/coccinelle/api/atomic_as_refcounter.cocci129
1 files changed, 129 insertions, 0 deletions
diff --git a/scripts/coccinelle/api/atomic_as_refcounter.cocci b/scripts/coccinelle/api/atomic_as_refcounter.cocci
new file mode 100644
index 000000000000..988120e0fd67
--- /dev/null
+++ b/scripts/coccinelle/api/atomic_as_refcounter.cocci
@@ -0,0 +1,129 @@
+// 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)