diff options
Diffstat (limited to 'kernel/scripts/coccinelle/free')
| -rw-r--r-- | kernel/scripts/coccinelle/free/clk_put.cocci | 67 | ||||
| -rw-r--r-- | kernel/scripts/coccinelle/free/devm_free.cocci | 71 | ||||
| -rw-r--r-- | kernel/scripts/coccinelle/free/ifnullfree.cocci | 53 | ||||
| -rw-r--r-- | kernel/scripts/coccinelle/free/iounmap.cocci | 67 | ||||
| -rw-r--r-- | kernel/scripts/coccinelle/free/kfree.cocci | 121 | ||||
| -rw-r--r-- | kernel/scripts/coccinelle/free/kfreeaddr.cocci | 32 | ||||
| -rw-r--r-- | kernel/scripts/coccinelle/free/pci_free_consistent.cocci | 52 |
7 files changed, 463 insertions, 0 deletions
diff --git a/kernel/scripts/coccinelle/free/clk_put.cocci b/kernel/scripts/coccinelle/free/clk_put.cocci new file mode 100644 index 000000000..46747adfd --- /dev/null +++ b/kernel/scripts/coccinelle/free/clk_put.cocci @@ -0,0 +1,67 @@ +/// Find missing clk_puts. +/// +//# This only signals a missing clk_put when there is a clk_put later +//# in the same function. +//# False positives can be due to loops. +// +// Confidence: Moderate +// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6. GPLv2. +// Copyright: (C) 2012 Gilles Muller, INRIA/LiP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: +// Options: + +virtual context +virtual org +virtual report + +@clk@ +expression e; +statement S,S1; +int ret; +position p1,p2,p3; +@@ + +e = clk_get@p1(...) +... when != clk_put(e) +if (<+...e...+>) S +... when any + when != clk_put(e) + when != if (...) { ... clk_put(e); ... } +( + if (ret == 0) S1 +| +if (...) + { ... + return 0; } +| +if (...) + { ... + return <+...e...+>; } +| +*if@p2 (...) + { ... when != clk_put(e) + when forall + return@p3 ...; } +) +... when any +clk_put(e); + +@script:python depends on org@ +p1 << clk.p1; +p2 << clk.p2; +p3 << clk.p3; +@@ + +cocci.print_main("clk_get",p1) +cocci.print_secs("if",p2) +cocci.print_secs("needed clk_put",p3) + +@script:python depends on report@ +p1 << clk.p1; +p2 << clk.p2; +p3 << clk.p3; +@@ + +msg = "ERROR: missing clk_put; clk_get on line %s and execution via conditional on line %s" % (p1[0].line,p2[0].line) +coccilib.report.print_report(p3[0],msg) diff --git a/kernel/scripts/coccinelle/free/devm_free.cocci b/kernel/scripts/coccinelle/free/devm_free.cocci new file mode 100644 index 000000000..3d9349012 --- /dev/null +++ b/kernel/scripts/coccinelle/free/devm_free.cocci @@ -0,0 +1,71 @@ +/// Find uses of standard freeing functons on values allocated using devm_ +/// functions. Values allocated using the devm_functions are freed when +/// the device is detached, and thus the use of the standard freeing +/// function would cause a double free. +/// See Documentation/driver-model/devres.txt for more information. +/// +/// A difficulty of detecting this problem is that the standard freeing +/// function might be called from a different function than the one +/// containing the allocation function. It is thus necessary to make the +/// connection between the allocation function and the freeing function. +/// Here this is done using the specific argument text, which is prone to +/// false positives. There is no rule for the request_region and +/// request_mem_region variants because this heuristic seems to be a bit +/// less reliable in these cases. +/// +// Confidence: Moderate +// Copyright: (C) 2011 Julia Lawall, INRIA/LIP6. GPLv2. +// Copyright: (C) 2011 Gilles Muller, INRIA/LiP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: +// Options: --no-includes --include-headers + +virtual org +virtual report +virtual context + +@r depends on context || org || report@ +expression x; +@@ + +( + x = devm_kzalloc(...) +| + x = devm_request_irq(...) +| + x = devm_ioremap(...) +| + x = devm_ioremap_nocache(...) +| + x = devm_ioport_map(...) +) + +@pb@ +expression r.x; +position p; +@@ + +( +* kfree@p(x) +| +* free_irq@p(x) +| +* iounmap@p(x) +| +* ioport_unmap@p(x) +) + +@script:python depends on org@ +p << pb.p; +@@ + +msg="WARNING: invalid free of devm_ allocated data" +coccilib.org.print_todo(p[0], msg) + +@script:python depends on report@ +p << pb.p; +@@ + +msg="WARNING: invalid free of devm_ allocated data" +coccilib.report.print_report(p[0], msg) + diff --git a/kernel/scripts/coccinelle/free/ifnullfree.cocci b/kernel/scripts/coccinelle/free/ifnullfree.cocci new file mode 100644 index 000000000..a42d70bf8 --- /dev/null +++ b/kernel/scripts/coccinelle/free/ifnullfree.cocci @@ -0,0 +1,53 @@ +/// NULL check before some freeing functions is not needed. +/// +/// Based on checkpatch warning +/// "kfree(NULL) is safe this check is probably not required" +/// and kfreeaddr.cocci by Julia Lawall. +/// +// Copyright: (C) 2014 Fabian Frederick. GPLv2. +// Comments: - +// Options: --no-includes --include-headers + +virtual patch +virtual org +virtual report +virtual context + +@r2 depends on patch@ +expression E; +@@ +- if (E) +( +- kfree(E); ++ kfree(E); +| +- debugfs_remove(E); ++ debugfs_remove(E); +| +- debugfs_remove_recursive(E); ++ debugfs_remove_recursive(E); +| +- usb_free_urb(E); ++ usb_free_urb(E); +) + +@r depends on context || report || org @ +expression E; +position p; +@@ + +* if (E) +* \(kfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\|usb_free_urb\)(E); + +@script:python depends on org@ +p << r.p; +@@ + +cocci.print_main("NULL check before that freeing function is not needed", p) + +@script:python depends on report@ +p << r.p; +@@ + +msg = "WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values." +coccilib.report.print_report(p[0], msg) diff --git a/kernel/scripts/coccinelle/free/iounmap.cocci b/kernel/scripts/coccinelle/free/iounmap.cocci new file mode 100644 index 000000000..5384f4ba1 --- /dev/null +++ b/kernel/scripts/coccinelle/free/iounmap.cocci @@ -0,0 +1,67 @@ +/// Find missing iounmaps. +/// +//# This only signals a missing iounmap when there is an iounmap later +//# in the same function. +//# False positives can be due to loops. +// +// Confidence: Moderate +// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6. GPLv2. +// Copyright: (C) 2012 Gilles Muller, INRIA/LiP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: +// Options: + +virtual context +virtual org +virtual report + +@iom@ +expression e; +statement S,S1; +int ret; +position p1,p2,p3; +@@ + +e = \(ioremap@p1\|ioremap_nocache@p1\)(...) +... when != iounmap(e) +if (<+...e...+>) S +... when any + when != iounmap(e) + when != if (...) { ... iounmap(e); ... } +( + if (ret == 0) S1 +| +if (...) + { ... + return 0; } +| +if (...) + { ... + return <+...e...+>; } +| +*if@p2 (...) + { ... when != iounmap(e) + when forall + return@p3 ...; } +) +... when any +iounmap(e); + +@script:python depends on org@ +p1 << iom.p1; +p2 << iom.p2; +p3 << iom.p3; +@@ + +cocci.print_main("ioremap",p1) +cocci.print_secs("if",p2) +cocci.print_secs("needed iounmap",p3) + +@script:python depends on report@ +p1 << iom.p1; +p2 << iom.p2; +p3 << iom.p3; +@@ + +msg = "ERROR: missing iounmap; ioremap on line %s and execution via conditional on line %s" % (p1[0].line,p2[0].line) +coccilib.report.print_report(p3[0],msg) diff --git a/kernel/scripts/coccinelle/free/kfree.cocci b/kernel/scripts/coccinelle/free/kfree.cocci new file mode 100644 index 000000000..577b78056 --- /dev/null +++ b/kernel/scripts/coccinelle/free/kfree.cocci @@ -0,0 +1,121 @@ +/// 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) 2010-2012 Nicolas Palix. GPLv2. +// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6. GPLv2. +// Copyright: (C) 2010-2012 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 +| + E2 == E@p +| + E2 != E@p +| + !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 = "ERROR: reference preceded by free on line %s" % (p1[0].line) +coccilib.report.print_report(p2[0],msg) diff --git a/kernel/scripts/coccinelle/free/kfreeaddr.cocci b/kernel/scripts/coccinelle/free/kfreeaddr.cocci new file mode 100644 index 000000000..ce8aacc31 --- /dev/null +++ b/kernel/scripts/coccinelle/free/kfreeaddr.cocci @@ -0,0 +1,32 @@ +/// Free of a structure field +/// +// Confidence: High +// Copyright: (C) 2013 Julia Lawall, INRIA/LIP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: +// Options: --no-includes --include-headers + +virtual org +virtual report +virtual context + +@r depends on context || report || org @ +expression e; +identifier f; +position p; +@@ + +* kfree@p(&e->f) + +@script:python depends on org@ +p << r.p; +@@ + +cocci.print_main("kfree",p) + +@script:python depends on report@ +p << r.p; +@@ + +msg = "ERROR: kfree of structure field" +coccilib.report.print_report(p[0],msg) diff --git a/kernel/scripts/coccinelle/free/pci_free_consistent.cocci b/kernel/scripts/coccinelle/free/pci_free_consistent.cocci new file mode 100644 index 000000000..43600ccb6 --- /dev/null +++ b/kernel/scripts/coccinelle/free/pci_free_consistent.cocci @@ -0,0 +1,52 @@ +/// Find missing pci_free_consistent for every pci_alloc_consistent. +/// +// Confidence: Moderate +// Copyright: (C) 2013 Petr Strnad. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Keywords: pci_free_consistent, pci_alloc_consistent +// Options: --no-includes --include-headers + +virtual report +virtual org + +@search@ +local idexpression id; +expression x,y,z,e; +position p1,p2; +type T; +@@ + +id = pci_alloc_consistent@p1(x,y,&z) +... when != e = id +if (id == NULL || ...) { ... return ...; } +... when != pci_free_consistent(x,y,id,z) + when != if (id) { ... pci_free_consistent(x,y,id,z) ... } + when != if (y) { ... pci_free_consistent(x,y,id,z) ... } + when != e = (T)id + when exists +( +return 0; +| +return 1; +| +return id; +| +return@p2 ...; +) + +@script:python depends on report@ +p1 << search.p1; +p2 << search.p2; +@@ + +msg = "ERROR: missing pci_free_consistent; pci_alloc_consistent on line %s and return without freeing on line %s" % (p1[0].line,p2[0].line) +coccilib.report.print_report(p2[0],msg) + +@script:python depends on org@ +p1 << search.p1; +p2 << search.p2; +@@ + +msg = "ERROR: missing pci_free_consistent; pci_alloc_consistent on line %s and return without freeing on line %s" % (p1[0].line,p2[0].line) +cocci.print_main(msg,p1) +cocci.print_secs("",p2) |