2010-10-09 03:27:39 +08:00
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/// Find a use after free.
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//# Values of variables may imply that some
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//# execution paths are not possible, resulting in false positives.
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//# Another source of false positives are macros such as
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//# SCTP_DBG_OBJCNT_DEC that do not actually evaluate their argument
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2010-08-24 23:39:04 +08:00
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///
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// Confidence: Moderate
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// Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2.
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// Copyright: (C) 2010 Julia Lawall, DIKU. GPLv2.
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// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. GPLv2.
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// URL: http://coccinelle.lip6.fr/
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// Comments:
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// Options: -no_includes -include_headers
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virtual org
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virtual report
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@free@
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expression E;
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position p1;
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@@
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kfree@p1(E)
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@print expression@
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constant char *c;
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expression free.E,E2;
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type T;
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position p;
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identifier f;
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@@
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(
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f(...,c,...,(T)E@p,...)
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E@p == E2
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E@p != E2
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!E@p
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E@p || ...
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)
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@sz@
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expression free.E;
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position p;
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@@
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sizeof(<+...E@p...+>)
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@loop exists@
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expression E;
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identifier l;
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position ok;
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@@
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while (1) { ...
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kfree@ok(E)
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... when != break;
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when != goto l;
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when forall
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}
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@r exists@
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expression free.E, subE<=free.E, E2;
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expression E1;
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iterator iter;
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statement S;
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position free.p1!=loop.ok,p2!={print.p,sz.p};
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@@
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kfree@p1(E,...)
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...
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(
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iter(...,subE,...) S // no use
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list_remove_head(E1,subE,...)
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subE = E2
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subE++
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++subE
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--subE
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subE--
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&subE
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BUG(...)
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BUG_ON(...)
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return_VALUE(...)
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return_ACPI_STATUS(...)
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E@p2 // bad use
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)
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@script:python depends on org@
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p1 << free.p1;
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p2 << r.p2;
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@@
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cocci.print_main("kfree",p1)
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cocci.print_secs("ref",p2)
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@script:python depends on report@
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p1 << free.p1;
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p2 << r.p2;
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@@
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msg = "reference preceded by free on line %s" % (p1[0].line)
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coccilib.report.print_report(p2[0],msg)
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