* Read total cert counts with atomic.LoadUint32(...)
When generating the tidy status, we read the values of two backend
atomics, b.certCount and b.revokedCertCount, without using the atomic
load operation. This resulted in a data race when the status was read
at the same time as an on-going tidy operation:
WARNING: DATA RACE
Write at 0x00c00c77680c by goroutine 90522:
sync/atomic.AddInt32()
/usr/local/go/src/runtime/race_amd64.s:281 +0xb
sync/atomic.AddUint32()
<autogenerated>:1 +0x1a
github.com/hashicorp/vault/builtin/logical/pki.(*backend).tidyStatusIncRevokedCertCount()
/home/circleci/go/src/github.com/hashicorp/vault/builtin/logical/pki/path_tidy.go:1236 +0x107
github.com/hashicorp/vault/builtin/logical/pki.(*backend).doTidyRevocationStore()
/home/circleci/go/src/github.com/hashicorp/vault/builtin/logical/pki/path_tidy.go:525 +0x1404
github.com/hashicorp/vault/builtin/logical/pki.(*backend).startTidyOperation.func1.1()
/home/circleci/go/src/github.com/hashicorp/vault/builtin/logical/pki/path_tidy.go:290 +0x1a4
github.com/hashicorp/vault/builtin/logical/pki.(*backend).startTidyOperation.func1()
/home/circleci/go/src/github.com/hashicorp/vault/builtin/logical/pki/path_tidy.go:342 +0x278
Previous read at 0x00c00c77680c by goroutine 90528:
reflect.Value.Uint()
/usr/local/go/src/reflect/value.go:2584 +0x195
encoding/json.uintEncoder()
/usr/local/go/src/encoding/json/encode.go:562 +0x45
encoding/json.ptrEncoder.encode()
/usr/local/go/src/encoding/json/encode.go:944 +0x3c2
encoding/json.ptrEncoder.encode-fm()
<autogenerated>:1 +0x90
encoding/json.(*encodeState).reflectValue()
/usr/local/go/src/encoding/json/encode.go:359 +0x88
encoding/json.interfaceEncoder()
/usr/local/go/src/encoding/json/encode.go:715 +0x17b
encoding/json.mapEncoder.encode()
/usr/local/go/src/encoding/json/encode.go:813 +0x854
... more stack trace pointing into JSON encoding and http
handler...
In particular, because the tidy status was directly reading the uint
value without resorting to the atomic side, the JSON serialization could
race with a later atomic update.
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
* Also use atomic load in tests
Because no tidy operation is running here, it should be safe to read the
pointed value directly, but use the safer atomic.Load for consistency.
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
* Add changelog entry
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
---------
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
