| | 1 | /// Find a use after free. |
| | 2 | //# Values of variables may imply that some |
| | 3 | //# execution paths are not possible, resulting in false positives. |
| | 4 | //# Another source of false positives are macros |
| | 5 | //# that do not actually evaluate their argument |
| | 6 | /// |
| | 7 | // Confidence: Moderate |
| | 8 | // Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2. |
| | 9 | // Copyright: (C) 2010 Julia Lawall, DIKU. GPLv2. |
| | 10 | // Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. GPLv2. |
| | 11 | // URL: http://coccinelle.lip6.fr/ |
| | 12 | // Comments: |
| | 13 | // Options: -no_includes -include_headers -D report |
| | 14 | |
| | 15 | virtual org |
| | 16 | virtual report |
| | 17 | |
| | 18 | @free@ |
| | 19 | expression E; |
| | 20 | position p1; |
| | 21 | @@ |
| | 22 | |
| | 23 | \(contigfree@p1(E,...)\|kfree@p1(E,...)\|objcache_put@p1(...,E)\|mpipe_free@p1(...,E)\|zfree@p1(...,E)\) |
| | 24 | |
| | 25 | @print expression@ |
| | 26 | constant char *c; |
| | 27 | expression free.E,E2; |
| | 28 | type T; |
| | 29 | position p; |
| | 30 | identifier f; |
| | 31 | @@ |
| | 32 | |
| | 33 | ( |
| | 34 | f(...,c,...,(T)E@p,...) |
| | 35 | | |
| | 36 | E@p == E2 |
| | 37 | | |
| | 38 | E@p != E2 |
| | 39 | | |
| | 40 | !E@p |
| | 41 | | |
| | 42 | E@p || ... |
| | 43 | ) |
| | 44 | |
| | 45 | @sz@ |
| | 46 | expression free.E; |
| | 47 | position p; |
| | 48 | @@ |
| | 49 | |
| | 50 | sizeof(<+...E@p...+>) |
| | 51 | |
| | 52 | @loop exists@ |
| | 53 | expression E; |
| | 54 | identifier l; |
| | 55 | position ok; |
| | 56 | @@ |
| | 57 | |
| | 58 | while (1) { ... |
| | 59 | \(contigfree@ok(E,...)\|kfree@ok(E,...)\|objcache_put@ok(...,E)\|mpipe_free@ok(...,E)\|zfree@ok(...,E)\) |
| | 60 | ... when != break; |
| | 61 | when != goto l; |
| | 62 | when forall |
| | 63 | } |
| | 64 | |
| | 65 | @r exists@ |
| | 66 | expression free.E, subE<=free.E, E2; |
| | 67 | expression E1; |
| | 68 | iterator iter; |
| | 69 | statement S; |
| | 70 | position free.p1!=loop.ok,p2!={print.p,sz.p}; |
| | 71 | @@ |
| | 72 | |
| | 73 | \(contigfree@p1(E,...)\|kfree@p1(E,...)\|objcache_put@p1(...,E)\|mpipe_free@p1(...,E)\|zfree@p1(...,E)\) |
| | 74 | ... |
| | 75 | ( |
| | 76 | iter(...,subE,...) S // no use |
| | 77 | | |
| | 78 | list_remove_head(E1,subE,...) |
| | 79 | | |
| | 80 | subE = E2 |
| | 81 | | |
| | 82 | subE++ |
| | 83 | | |
| | 84 | ++subE |
| | 85 | | |
| | 86 | --subE |
| | 87 | | |
| | 88 | subE-- |
| | 89 | | |
| | 90 | &subE |
| | 91 | | |
| | 92 | return_VALUE(...) |
| | 93 | | |
| | 94 | return_ACPI_STATUS(...) |
| | 95 | | |
| | 96 | E@p2 // bad use |
| | 97 | ) |
| | 98 | |
| | 99 | @script:python depends on org@ |
| | 100 | p1 << free.p1; |
| | 101 | p2 << r.p2; |
| | 102 | @@ |
| | 103 | |
| | 104 | cocci.print_main("kfree",p1) |
| | 105 | cocci.print_secs("ref",p2) |
| | 106 | |
| | 107 | @script:python depends on report@ |
| | 108 | p1 << free.p1; |
| | 109 | p2 << r.p2; |
| | 110 | @@ |
| | 111 | |
| | 112 | msg = "reference preceded by free on line %s" % (p1[0].line) |
| | 113 | coccilib.report.print_report(p2[0],msg) |
projects / dragonfly.git / blame_incremental