Public bug reported:
ubuntu-core/15.04/edge
armhf
getrandom() stucks when process has no read permission on /dev/urandom.
It should return an error.
Easy example to reproduce in golang:
//--------------------
package main
import (
"crypto/rand"
"io"
)
func main() {
p := make([]byte, 16)
if _, err := io.ReadFull(rand.Reader, p); err != nil { // <--- stuck!
println(err)
return
}
println(p)
}
//--------------------
The internal implementation of reading from rand.Reader contains getrandom()
syscall:
https://golang.org/src/crypto/rand/rand_linux.go
** Affects: ubuntu
Importance: Undecided
Status: New
** Information type changed from Private Security to Public
** Package changed: libseccomp (Ubuntu) => ubuntu
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https://bugs.launchpad.net/bugs/1452402
Title:
getrandom() stucks when process has no read permission on /dev/urandom
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