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-rw-r--r--src/crypto/rand/rand_linux.go14
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diff --git a/src/crypto/rand/rand_linux.go b/src/crypto/rand/rand_linux.go
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+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package rand
+
+// maxGetRandomRead is the maximum number of bytes to ask for in one call to the
+// getrandom() syscall. In linux at most 2^25-1 bytes will be returned per call.
+// From the manpage
+//
+// * When reading from the urandom source, a maximum of 33554431 bytes
+// is returned by a single call to getrandom() on systems where int
+// has a size of 32 bits.
+const maxGetRandomRead = (1 << 25) - 1