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tests: vm: pretend the RNG is initialized

Message ID 20220411114119.e8c4e465da8e.I47453169065a52e80433b529073726a3c5855194@changeid
State Accepted
Headers show
Series tests: vm: pretend the RNG is initialized | expand

Commit Message

Johannes Berg April 11, 2022, 9:41 a.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

We don't particularly care about the quality of random numbers
during the test. So far, there hasn't been an issue with the
RNG not being initialized completely, we only get a few prints
about uninitialized reads from urandom. However, if some tool
were to actually use /dev/random, it might get stuck. Call the
RNDADDTOENTCNT ioctl to unblock this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 tests/hwsim/vm/inside.sh | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Jouni Malinen April 16, 2022, 3:03 p.m. UTC | #1 
On Mon, Apr 11, 2022 at 11:41:20AM +0200, Johannes Berg wrote:
> We don't particularly care about the quality of random numbers
> during the test. So far, there hasn't been an issue with the
> RNG not being initialized completely, we only get a few prints
> about uninitialized reads from urandom. However, if some tool
> were to actually use /dev/random, it might get stuck. Call the
> RNDADDTOENTCNT ioctl to unblock this.

Thanks, applied.
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Patch

diff --git a/tests/hwsim/vm/inside.sh b/tests/hwsim/vm/inside.sh
index bfcbda631e4f..f0a0d9bf3b9f 100755
--- a/tests/hwsim/vm/inside.sh
+++ b/tests/hwsim/vm/inside.sh
@@ -53,6 +53,11 @@  ln -s /proc/self/fd/0 /dev/stdin
 ln -s /proc/self/fd/1 /dev/stdout
 ln -s /proc/self/fd/2 /dev/stderr
 
+# pretend we've initialized the RNG, we don't care here
+# about the actual quality of the randomness. The ioctl
+# is RNDADDTOENTCNT (at least on x86).
+PYTHONHASHSEED=0 python3 -c 'import fcntl; fd=open("/dev/random", "w"); fcntl.ioctl(fd.fileno(), 0x40045201, b"\x00\x01\x00\x00")'
+
 echo "VM has started up" > /dev/ttyS0
 
 # create stub sudo - everything runs as uid 0