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b56e535509
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>
130 lines
2.2 KiB
Plaintext
130 lines
2.2 KiB
Plaintext
// Check if refcount_t type and API should be used
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// instead of atomic_t type when dealing with refcounters
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//
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// Copyright (c) 2016-2017, Elena Reshetova, Intel Corporation
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//
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// Confidence: Moderate
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// URL: http://coccinelle.lip6.fr/
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// Options: --include-headers --very-quiet
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virtual report
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@r1 exists@
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identifier a, x;
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position p1, p2;
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identifier fname =~ ".*free.*";
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identifier fname2 =~ ".*destroy.*";
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identifier fname3 =~ ".*del.*";
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identifier fname4 =~ ".*queue_work.*";
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identifier fname5 =~ ".*schedule_work.*";
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identifier fname6 =~ ".*call_rcu.*";
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@@
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(
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atomic_dec_and_test@p1(&(a)->x)
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atomic_dec_and_lock@p1(&(a)->x, ...)
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atomic_long_dec_and_lock@p1(&(a)->x, ...)
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atomic_long_dec_and_test@p1(&(a)->x)
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atomic64_dec_and_test@p1(&(a)->x)
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local_dec_and_test@p1(&(a)->x)
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)
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...
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(
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fname@p2(a, ...);
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fname2@p2(...);
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fname3@p2(...);
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fname4@p2(...);
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fname5@p2(...);
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fname6@p2(...);
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)
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@script:python depends on report@
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p1 << r1.p1;
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p2 << r1.p2;
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@@
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msg = "atomic_dec_and_test variation before object free at line %s."
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coccilib.report.print_report(p1[0], msg % (p2[0].line))
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@r4 exists@
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identifier a, x, y;
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position p1, p2;
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identifier fname =~ ".*free.*";
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@@
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(
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atomic_dec_and_test@p1(&(a)->x)
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atomic_dec_and_lock@p1(&(a)->x, ...)
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atomic_long_dec_and_lock@p1(&(a)->x, ...)
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atomic_long_dec_and_test@p1(&(a)->x)
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atomic64_dec_and_test@p1(&(a)->x)
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local_dec_and_test@p1(&(a)->x)
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)
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...
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y=a
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...
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fname@p2(y, ...);
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@script:python depends on report@
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p1 << r4.p1;
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p2 << r4.p2;
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@@
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msg = "atomic_dec_and_test variation before object free at line %s."
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coccilib.report.print_report(p1[0], msg % (p2[0].line))
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@r2 exists@
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identifier a, x;
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position p1;
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@@
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(
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atomic_add_unless(&(a)->x,-1,1)@p1
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atomic_long_add_unless(&(a)->x,-1,1)@p1
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atomic64_add_unless(&(a)->x,-1,1)@p1
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)
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@script:python depends on report@
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p1 << r2.p1;
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@@
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msg = "atomic_add_unless"
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coccilib.report.print_report(p1[0], msg)
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@r3 exists@
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identifier x;
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position p1;
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@@
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(
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x = atomic_add_return@p1(-1, ...);
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x = atomic_long_add_return@p1(-1, ...);
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x = atomic64_add_return@p1(-1, ...);
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)
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@script:python depends on report@
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p1 << r3.p1;
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@@
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msg = "x = atomic_add_return(-1, ...)"
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coccilib.report.print_report(p1[0], msg)
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