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[thread-safety] classify protected-if reads/writes in callees as protected when a lock is held in the caller

Browse Source 
Summary: Fixes bug pointed out by ilyasergey, thanks!

Reviewed By: peterogithub

Differential Revision: D4736873

fbshipit-source-id: f4be32a
master
Sam Blackshear 8 years ago committed by Facebook Github Bot
parent 9a07318ab7
commit e7e32b038b
3 changed files with 126 additions and 78 deletions
Show Stats Download Patch File Download Diff File

63
infer/src/checkers/ThreadSafety.ml
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@ -467,16 +467,10 @@ module TransferFunctions (CFG : ProcCfg.S) = struct
(AccessDomain.get_accesses pre callee_accesses) call_site
|> PathDomain.join (AccessDomain.get_accesses pre caller_accesses) in
AccessDomain.add pre combined_accesses caller_accesses in
let combined_safe_accesses =
combine_accesses_for_pre
AccessPrecondition.Protected
~caller_accesses:astate.accesses
~callee_accesses in
let locks' = callee_locks || astate.locks in
let threads' = callee_threads || astate.threads in
let astate' =
if is_unprotected locks' pdesc
then
let unprotected = is_unprotected locks' pdesc in
let add_conditional_accesses index accesses_acc (actual_exp, actual_typ) =
if is_constant actual_exp
then
@ -500,11 +494,14 @@ module TransferFunctions (CFG : ProcCfg.S) = struct
begin
match FormalMap.get_formal_index base extras with
| Some formal_index ->
let pre =
if unprotected
then AccessPrecondition.ProtectedIf (Some formal_index)
else AccessPrecondition.Protected in
(* the actual passed to the current callee is rooted in a
formal. add to conditional accesses *)
PathDomain.Sinks.fold
(AccessDomain.add_access
(ProtectedIf (Some formal_index)))
(AccessDomain.add_access pre)
(PathDomain.sinks callee_conditional_accesses)
accesses_acc
| None ->
@ -515,19 +512,29 @@ module TransferFunctions (CFG : ProcCfg.S) = struct
astate.attribute_map
with
| (Some formal_index) ->
(* access path conditionally owned, add to
protected-if accesses *)
let pre =
if unprotected
then
AccessPrecondition.ProtectedIf (Some formal_index)
else
AccessPrecondition.Protected in
(* access path conditionally owned, add to protected
accesses if lock held, protected-if accesses
otherwise *)
PathDomain.Sinks.fold
(AccessDomain.add_access
(ProtectedIf (Some formal_index)))
(AccessDomain.add_access pre)
(PathDomain.sinks callee_conditional_accesses)
accesses_acc
| None ->
(* access path not owned and not rooted in a formal.
add to unprotected accesses *)
add to protected accesses if lock held, unprotected
accesses otherwise *)
let pre =
if unprotected
then AccessPrecondition.unprotected
else AccessPrecondition.Protected in
PathDomain.Sinks.fold
(AccessDomain.add_access
AccessPrecondition.unprotected)
(AccessDomain.add_access pre)
(PathDomain.sinks callee_conditional_accesses)
accesses_acc
end
@ -539,16 +546,32 @@ module TransferFunctions (CFG : ProcCfg.S) = struct
accesses_acc
end in
let combined_safe_accesses =
combine_accesses_for_pre
AccessPrecondition.Protected
~caller_accesses:astate.accesses
~callee_accesses in
let unsafe_accesses =
if unprotected
then
combine_accesses_for_pre
AccessPrecondition.unprotected
~caller_accesses:combined_safe_accesses
~callee_accesses in
~callee_accesses
else
(* add callee unsafe accesses to caller safe accesses *)
let combined_accesses =
PathDomain.with_callsite
(AccessDomain.get_accesses
AccessPrecondition.unprotected callee_accesses) call_site
|> PathDomain.join
(AccessDomain.get_accesses
AccessPrecondition.Protected combined_safe_accesses) in
AccessDomain.add
AccessPrecondition.Protected combined_accesses combined_safe_accesses in
let accesses =
List.foldi ~f:add_conditional_accesses ~init:unsafe_accesses actuals in
{ astate with accesses; }
else
{ astate with accesses = combined_safe_accesses; } in
{ astate with accesses; } in
let attribute_map =
propagate_return_attributes
ret_opt

24
infer/tests/codetoanalyze/java/threadsafety/ReadWriteRaces.java
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@ -9,8 +9,21 @@
package codetoanalyze.java.checkers;
import java.util.concurrent.locks.ReentrantLock;
import javax.annotation.concurrent.ThreadSafe;
class C {
private int x = 0;
public int get() {
return x;
}
public void set(int v) {
x = v;
}
}
@ThreadSafe
class ReadWriteRaces {
@ -85,4 +98,15 @@ class ReadWriteRaces{
return field3;
}
private final C c = new C();
private final ReentrantLock lock = new ReentrantLock();
public void readInCalleeOutsideSyncBad(int i) {
if (c.get() > i) { // should report read/write race here
lock.lock();
c.set(i);
lock.unlock();
}
}
}

1
infer/tests/codetoanalyze/java/threadsafety/issues.exp
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@ -66,6 +66,7 @@ codetoanalyze/java/threadsafety/ReadWriteRaces.java, Object ReadWriteRaces.unpro
codetoanalyze/java/threadsafety/ReadWriteRaces.java, void ReadWriteRaces.m1(), 2, THREAD_SAFETY_VIOLATION, [access to codetoanalyze.java.checkers.ReadWriteRaces.racy]
codetoanalyze/java/threadsafety/ReadWriteRaces.java, void ReadWriteRaces.m2(), 1, THREAD_SAFETY_VIOLATION, [access to codetoanalyze.java.checkers.ReadWriteRaces.racy]
codetoanalyze/java/threadsafety/ReadWriteRaces.java, void ReadWriteRaces.m3(), 1, THREAD_SAFETY_VIOLATION, [access to codetoanalyze.java.checkers.ReadWriteRaces.racy]
codetoanalyze/java/threadsafety/ReadWriteRaces.java, void ReadWriteRaces.readInCalleeOutsideSyncBad(int), 1, THREAD_SAFETY_VIOLATION, [call to int C.get(),access to codetoanalyze.java.checkers.C.x]
codetoanalyze/java/threadsafety/ThreadSafeExample.java, void ExtendsThreadSafeExample.newmethodBad(), 1, THREAD_SAFETY_VIOLATION, [access to codetoanalyze.java.checkers.ExtendsThreadSafeExample.field]
codetoanalyze/java/threadsafety/ThreadSafeExample.java, void ExtendsThreadSafeExample.tsOK(), 1, THREAD_SAFETY_VIOLATION, [access to codetoanalyze.java.checkers.ExtendsThreadSafeExample.field]
codetoanalyze/java/threadsafety/ThreadSafeExample.java, void NonThreadSafeClass.threadSafeMethod(), 1, THREAD_SAFETY_VIOLATION, [access to codetoanalyze.java.checkers.NonThreadSafeClass.field]

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