/dev/random entropy on readonly file system
Clash Royale CLAN TAG#URR8PPP
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My hostapd works very well on my raspberry Pi3. But if I put root filesystem in readonly, it does not work. I have put some folders like /var/run and /tmp in a ramdisk filesystem.
I have seen something in log files when the root filesystem is readonly:
random: Cannot read from /dev/random: Resource temporarily unavailable
random: Got 0/20 bytes from /dev/random
random: Only 0/20 bytes of strong random data available from /dev/random
random: Not enough entropy pool available for secure operations
So I think something is wrong with /dev/random when the root filesystem is in readonly mode.
What should I do to fix that ?
-- Edit --
Here is the output of ls -l /dev/random:
crw-rw-rw- 1 root root 1, 8 nov. 12 16:17 /dev/random
devices random
asked Nov 10 '17 at 20:59
Bob5421
1112
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show 1 more comment
up vote
2
down vote
favorite
My hostapd works very well on my raspberry Pi3. But if I put root filesystem in readonly, it does not work. I have put some folders like /var/run and /tmp in a ramdisk filesystem.
I have seen something in log files when the root filesystem is readonly:
random: Cannot read from /dev/random: Resource temporarily unavailable
random: Got 0/20 bytes from /dev/random
random: Only 0/20 bytes of strong random data available from /dev/random
random: Not enough entropy pool available for secure operations
So I think something is wrong with /dev/random when the root filesystem is in readonly mode.
What should I do to fix that ?
-- Edit --
Here is the output of ls -l /dev/random:
crw-rw-rw- 1 root root 1, 8 nov. 12 16:17 /dev/random
devices random
asked Nov 10 '17 at 20:59
Bob5421
1112
Can you add the output ofls -l /dev/random(to your question, not as a response comment)?
– Andy Dalton
Nov 10 '17 at 21:37
Do you have the hardware random number generator enabled? If no, you might take a look at: nico-maas.de/?p=1562 You'll want to install and configure packagerng-tools.
– Andy Dalton
Nov 13 '17 at 16:01
It is a raspberry pi3 so i do not know if there is an hardware random number genrator...
– Bob5421
Nov 14 '17 at 18:20
Raspberry pi 3 has a RNG.
– Andy Dalton
Nov 14 '17 at 21:18
Okay so what should i do to make it work ?
– Bob5421
Nov 15 '17 at 13:17
 |Â
show 1 more comment
up vote
2
down vote
favorite
up vote
2
down vote
favorite
My hostapd works very well on my raspberry Pi3. But if I put root filesystem in readonly, it does not work. I have put some folders like /var/run and /tmp in a ramdisk filesystem.
I have seen something in log files when the root filesystem is readonly:
random: Cannot read from /dev/random: Resource temporarily unavailable
random: Got 0/20 bytes from /dev/random
random: Only 0/20 bytes of strong random data available from /dev/random
random: Not enough entropy pool available for secure operations
So I think something is wrong with /dev/random when the root filesystem is in readonly mode.
What should I do to fix that ?
-- Edit --
Here is the output of ls -l /dev/random:
crw-rw-rw- 1 root root 1, 8 nov. 12 16:17 /dev/random
devices random
asked Nov 10 '17 at 20:59
Bob5421
1112
My hostapd works very well on my raspberry Pi3. But if I put root filesystem in readonly, it does not work. I have put some folders like /var/run and /tmp in a ramdisk filesystem.
I have seen something in log files when the root filesystem is readonly:
random: Cannot read from /dev/random: Resource temporarily unavailable
random: Got 0/20 bytes from /dev/random
random: Only 0/20 bytes of strong random data available from /dev/random
random: Not enough entropy pool available for secure operations
So I think something is wrong with /dev/random when the root filesystem is in readonly mode.
What should I do to fix that ?
-- Edit --
Here is the output of ls -l /dev/random:
crw-rw-rw- 1 root root 1, 8 nov. 12 16:17 /dev/random
devices random
asked Nov 10 '17 at 20:59
Bob5421
1112
edited Nov 12 '17 at 17:38
asked Nov 10 '17 at 20:59
Bob5421
1112
asked Nov 10 '17 at 20:59
Bob5421
1112
asked Nov 10 '17 at 20:59
Bob5421
1112
1112
Can you add the output ofls -l /dev/random(to your question, not as a response comment)?
– Andy Dalton
Nov 10 '17 at 21:37
Do you have the hardware random number generator enabled? If no, you might take a look at: nico-maas.de/?p=1562 You'll want to install and configure packagerng-tools.
– Andy Dalton
Nov 13 '17 at 16:01
It is a raspberry pi3 so i do not know if there is an hardware random number genrator...
– Bob5421
Nov 14 '17 at 18:20
Raspberry pi 3 has a RNG.
– Andy Dalton
Nov 14 '17 at 21:18
Okay so what should i do to make it work ?
– Bob5421
Nov 15 '17 at 13:17
 |Â
show 1 more comment
Can you add the output ofls -l /dev/random(to your question, not as a response comment)?
– Andy Dalton
Nov 10 '17 at 21:37
Do you have the hardware random number generator enabled? If no, you might take a look at: nico-maas.de/?p=1562 You'll want to install and configure packagerng-tools.
– Andy Dalton
Nov 13 '17 at 16:01
It is a raspberry pi3 so i do not know if there is an hardware random number genrator...
– Bob5421
Nov 14 '17 at 18:20
Raspberry pi 3 has a RNG.
– Andy Dalton
Nov 14 '17 at 21:18
Okay so what should i do to make it work ?
– Bob5421
Nov 15 '17 at 13:17
Can you add the output of
ls -l /dev/random (to your question, not as a response comment)?– Andy Dalton
Nov 10 '17 at 21:37
Can you add the output of
ls -l /dev/random (to your question, not as a response comment)?– Andy Dalton
Nov 10 '17 at 21:37
Do you have the hardware random number generator enabled? If no, you might take a look at: nico-maas.de/?p=1562 You'll want to install and configure package
rng-tools.– Andy Dalton
Nov 13 '17 at 16:01
Do you have the hardware random number generator enabled? If no, you might take a look at: nico-maas.de/?p=1562 You'll want to install and configure package
rng-tools.– Andy Dalton
Nov 13 '17 at 16:01
It is a raspberry pi3 so i do not know if there is an hardware random number genrator...
– Bob5421
Nov 14 '17 at 18:20
It is a raspberry pi3 so i do not know if there is an hardware random number genrator...
– Bob5421
Nov 14 '17 at 18:20
Raspberry pi 3 has a RNG.
– Andy Dalton
Nov 14 '17 at 21:18
Raspberry pi 3 has a RNG.
– Andy Dalton
Nov 14 '17 at 21:18
Okay so what should i do to make it work ?
– Bob5421
Nov 15 '17 at 13:17
Okay so what should i do to make it work ?
– Bob5421
Nov 15 '17 at 13:17
 |Â
show 1 more comment
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Can you add the output of
ls -l /dev/random(to your question, not as a response comment)?– Andy Dalton
Nov 10 '17 at 21:37
Do you have the hardware random number generator enabled? If no, you might take a look at: nico-maas.de/?p=1562 You'll want to install and configure package
rng-tools.– Andy Dalton
Nov 13 '17 at 16:01
It is a raspberry pi3 so i do not know if there is an hardware random number genrator...
– Bob5421
Nov 14 '17 at 18:20
Raspberry pi 3 has a RNG.
– Andy Dalton
Nov 14 '17 at 21:18
Okay so what should i do to make it work ?
– Bob5421
Nov 15 '17 at 13:17