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| author | Nicolas Palix <npalix@diku.dk> | 2010-08-24 17:39:04 +0200 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2010-08-31 11:37:53 +0200 |
| commit | 43ba21b57a3e757000bfa8ccf46c81f232b4d881 (patch) | |
| tree | a4d8b0ab92c6739f430bb7f43cab8988d13dda9b /scripts/coccinelle/free | |
| parent | Coccinelle: Add iterators/list_entry_update.cocci (diff) | |
| download | linux-43ba21b57a3e757000bfa8ccf46c81f232b4d881.tar.xz linux-43ba21b57a3e757000bfa8ccf46c81f232b4d881.zip | |
Coccinelle: Add free/kfree.cocci
Find a use after free. Values of variables may imply that some
execution paths are not possible, resulting in false positives.
Another source of false positives are macros such as
SCTP_DBG_OBJCNT_DEC that do not actually evaluate their argument
Signed-off-by: Nicolas Palix <npalix@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'scripts/coccinelle/free')
| -rw-r--r-- | scripts/coccinelle/free/kfree.cocci | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/scripts/coccinelle/free/kfree.cocci b/scripts/coccinelle/free/kfree.cocci new file mode 100644 index 000000000000..c13a5395707b --- /dev/null +++ b/scripts/coccinelle/free/kfree.cocci @@ -0,0 +1,116 @@ +/// Find a use after free. Values of variables may imply that some +/// execution paths are not possible, resulting in false positives. +/// Another source of false positives are macros such as +/// SCTP_DBG_OBJCNT_DEC that do not actually evaluate their argument +/// +// Confidence: Moderate +// Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2. +// Copyright: (C) 2010 Julia Lawall, DIKU. GPLv2. +// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: +// Options: -no_includes -include_headers + +virtual org +virtual report + +@free@ +expression E; +position p1; +@@ + +kfree@p1(E) + +@print expression@ +constant char *c; +expression free.E,E2; +type T; +position p; +identifier f; +@@ + +( + f(...,c,...,(T)E@p,...) +| + E@p == E2 +| + E@p != E2 +| + !E@p +| + E@p || ... +) + +@sz@ +expression free.E; +position p; +@@ + + sizeof(<+...E@p...+>) + +@loop exists@ +expression E; +identifier l; +position ok; +@@ + +while (1) { ... + kfree@ok(E) + ... when != break; + when != goto l; + when forall +} + +@r exists@ +expression free.E, subE<=free.E, E2; +expression E1; +iterator iter; +statement S; +position free.p1!=loop.ok,p2!={print.p,sz.p}; +@@ + +kfree@p1(E,...) +... +( + iter(...,subE,...) S // no use +| + list_remove_head(E1,subE,...) +| + subE = E2 +| + subE++ +| + ++subE +| + --subE +| + subE-- +| + &subE +| + BUG(...) +| + BUG_ON(...) +| + return_VALUE(...) +| + return_ACPI_STATUS(...) +| + E@p2 // bad use +) + +@script:python depends on org@ +p1 << free.p1; +p2 << r.p2; +@@ + +cocci.print_main("kfree",p1) +cocci.print_secs("ref",p2) + +@script:python depends on report@ +p1 << free.p1; +p2 << r.p2; +@@ + +msg = "reference preceded by free on line %s" % (p1[0].line) +coccilib.report.print_report(p2[0],msg) |