diff options
Diffstat (limited to 'scripts/coccinelle/locks')
| -rw-r--r-- | scripts/coccinelle/locks/call_kern.cocci | 74 | ||||
| -rw-r--r-- | scripts/coccinelle/locks/double_lock.cocci | 92 | ||||
| -rw-r--r-- | scripts/coccinelle/locks/flags.cocci | 80 | ||||
| -rw-r--r-- | scripts/coccinelle/locks/mini_lock.cocci | 95 |
4 files changed, 341 insertions, 0 deletions
diff --git a/scripts/coccinelle/locks/call_kern.cocci b/scripts/coccinelle/locks/call_kern.cocci new file mode 100644 index 000000000000..00af5344a68f --- /dev/null +++ b/scripts/coccinelle/locks/call_kern.cocci @@ -0,0 +1,74 @@ +/// Find functions that refer to GFP_KERNEL but are called with locks held. +/// The proposed change of converting the GFP_KERNEL is not necessarily the +/// correct one. It may be desired to unlock the lock, or to not call the +/// function under the lock in the first place. +/// +// 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 patch + +@gfp exists@ +identifier fn; +position p; +@@ + +fn(...) { + ... when != read_unlock_irq(...) + when != write_unlock_irq(...) + when != read_unlock_irqrestore(...) + when != write_unlock_irqrestore(...) + when != spin_unlock(...) + when != spin_unlock_irq(...) + when != spin_unlock_irqrestore(...) + when != local_irq_enable(...) + when any + GFP_KERNEL@p + ... when any +} + +@locked@ +identifier gfp.fn; +@@ + +( +read_lock_irq +| +write_lock_irq +| +read_lock_irqsave +| +write_lock_irqsave +| +spin_lock +| +spin_trylock +| +spin_lock_irq +| +spin_lock_irqsave +| +local_irq_disable +) + (...) +... when != read_unlock_irq(...) + when != write_unlock_irq(...) + when != read_unlock_irqrestore(...) + when != write_unlock_irqrestore(...) + when != spin_unlock(...) + when != spin_unlock_irq(...) + when != spin_unlock_irqrestore(...) + when != local_irq_enable(...) +fn(...) + +@depends on locked@ +position gfp.p; +@@ + +- GFP_KERNEL@p ++ GFP_ATOMIC diff --git a/scripts/coccinelle/locks/double_lock.cocci b/scripts/coccinelle/locks/double_lock.cocci new file mode 100644 index 000000000000..63b24e682fad --- /dev/null +++ b/scripts/coccinelle/locks/double_lock.cocci @@ -0,0 +1,92 @@ +/// 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. 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 + +@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) diff --git a/scripts/coccinelle/locks/flags.cocci b/scripts/coccinelle/locks/flags.cocci new file mode 100644 index 000000000000..b4344d838097 --- /dev/null +++ b/scripts/coccinelle/locks/flags.cocci @@ -0,0 +1,80 @@ +/// Find nested lock+irqsave functions that use the same flags variables +/// +// Confidence: High +// 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 context +virtual org +virtual report + +@r@ +expression lock1,lock2,flags; +position p1,p2; +@@ + +( +spin_lock_irqsave@p1(lock1,flags) +| +read_lock_irqsave@p1(lock1,flags) +| +write_lock_irqsave@p1(lock1,flags) +) +... when != flags +( +spin_lock_irqsave(lock1,flags) +| +read_lock_irqsave(lock1,flags) +| +write_lock_irqsave(lock1,flags) +| +spin_lock_irqsave@p2(lock2,flags) +| +read_lock_irqsave@p2(lock2,flags) +| +write_lock_irqsave@p2(lock2,flags) +) + +@d@ +expression f <= r.flags; +expression lock1,lock2,flags; +position r.p1, r.p2; +@@ + +( +*spin_lock_irqsave@p1(lock1,flags) +| +*read_lock_irqsave@p1(lock1,flags) +| +*write_lock_irqsave@p1(lock1,flags) +) +... when != f +( +*spin_lock_irqsave@p2(lock2,flags) +| +*read_lock_irqsave@p2(lock2,flags) +| +*write_lock_irqsave@p2(lock2,flags) +) + +// ---------------------------------------------------------------------- + +@script:python depends on d && org@ +p1 << r.p1; +p2 << r.p2; +@@ + +cocci.print_main("original lock",p1) +cocci.print_secs("nested lock+irqsave that reuses flags",p2) + +@script:python depends on d && report@ +p1 << r.p1; +p2 << r.p2; +@@ + +msg="ERROR: nested lock+irqsave that reuses flags from %s." % (p1[0].line) +coccilib.report.print_report(p2[0], msg) diff --git a/scripts/coccinelle/locks/mini_lock.cocci b/scripts/coccinelle/locks/mini_lock.cocci new file mode 100644 index 000000000000..7641a2925434 --- /dev/null +++ b/scripts/coccinelle/locks/mini_lock.cocci @@ -0,0 +1,95 @@ +/// Find missing unlocks. This semantic match considers the specific case +/// where the unlock is missing from an if branch, and there is a lock +/// before the if and an unlock after the if. False positives are due to +/// cases where the if branch represents a case where the function is +/// supposed to exit with the lock held, or where there is some preceding +/// function call that releases the lock. +/// +// 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 + +@prelocked@ +position p1,p; +expression E1; +@@ + +( +mutex_lock@p1 +| +mutex_trylock@p1 +| +spin_lock@p1 +| +spin_trylock@p1 +| +read_lock@p1 +| +read_trylock@p1 +| +write_lock@p1 +| +write_trylock@p1 +| +read_lock_irq@p1 +| +write_lock_irq@p1 +| +read_lock_irqsave@p1 +| +write_lock_irqsave@p1 +| +spin_lock_irq@p1 +| +spin_lock_irqsave@p1 +) (E1@p,...); + +@looped@ +position r; +@@ + +for(...;...;...) { <+... return@r ...; ...+> } + +@err@ +expression E1; +position prelocked.p; +position up != prelocked.p1; +position r!=looped.r; +identifier lock,unlock; +@@ + +lock(E1@p,...); +<+... when != E1 +if (...) { + ... when != E1 + return@r ...; +} +...+> +unlock@up(E1,...); + +@script:python depends on org@ +p << prelocked.p1; +lock << err.lock; +unlock << err.unlock; +p2 << err.r; +@@ + +cocci.print_main(lock,p) +cocci.print_secs(unlock,p2) + +@script:python depends on report@ +p << prelocked.p1; +lock << err.lock; +unlock << err.unlock; +p2 << err.r; +@@ + +msg = "preceding lock on line %s" % (p[0].line) +coccilib.report.print_report(p2[0],msg) |