name : double_lock.cocci // SPDX-License-Identifier: GPL-2.0-only /// Find double locks. False positives may occur when some paths cannot /// occur at execution, due to the values of variables, and when there is /// an intervening function call that releases the lock. /// // Confidence: Moderate // Copyright: (C) 2010 Nicolas Palix, DIKU. // Copyright: (C) 2010 Julia Lawall, DIKU. // Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. // URL: https://coccinelle.gitlabpages.inria.fr/website // Comments: // Options: --no-includes --include-headers virtual org virtual report @locked@ position p1; expression E1; position p; @@ ( mutex_lock@p1 | mutex_trylock@p1 | spin_lock@p1 | spin_trylock@p1 | read_lock@p1 | read_trylock@p1 | write_lock@p1 | write_trylock@p1 ) (E1@p,...); @balanced@ position p1 != locked.p1; position locked.p; identifier lock,unlock; expression x <= locked.E1; expression E,locked.E1; expression E2; @@ if (E) { <+... when != E1 lock(E1@p,...) ...+> } ... when != E1 when != \(x = E2\|&x\) when forall if (E) { <+... when != E1 unlock@p1(E1,...) ...+> } @r depends on !balanced exists@ expression x <= locked.E1; expression locked.E1; expression E2; identifier lock; position locked.p,p1,p2; @@ lock@p1 (E1@p,...); ... when != E1 when != \(x = E2\|&x\) lock@p2 (E1,...); @script:python depends on org@ p1 << r.p1; p2 << r.p2; lock << r.lock; @@ cocci.print_main(lock,p1) cocci.print_secs("second lock",p2) @script:python depends on report@ p1 << r.p1; p2 << r.p2; lock << r.lock; @@ msg = "second lock on line %s" % (p2[0].line) coccilib.report.print_report(p1[0],msg)