https://bugs.kde.org/show_bug.cgi?id=359485
Bug ID: 359485
Summary: KRandom::random reads 16384 bytes from /dev/urandom
per invocation instead of 4
Product: frameworks-kcoreaddons
Version: unspecified
Platform: openSUSE RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
reads 16384 bytes from /dev/urandom per invocation, this is because QFile
stream is buffered by default.
Reproducible: Always
Steps to Reproduce:
Call KRandom::random from any application
Actual Results:
reads 16384 bytes from /dev/urandom
Expected Results:
A read of sizeof(seed)
git diff
diff --git a/src/lib/randomness/krandom.cpp b/src/lib/randomness/krandom.cpp
index da78388..93b917d 100644
--- a/src/lib/randomness/krandom.cpp
+++ b/src/lib/randomness/krandom.cpp
@@ -43,7 +43,7 @@ int KRandom::random()
unsigned int seed;
init = true;
QFile urandom(QStringLiteral("/dev/urandom"));
- bool opened = urandom.open(QIODevice::ReadOnly);
+ bool opened = urandom.open(QIODevice::ReadOnly |
QIODevice::Unbuffered);
if (!opened || urandom.read((char *)&seed, sizeof(seed)) !=
sizeof(seed)) {
// No /dev/urandom... try something else.
srand(getpid());
--
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