On 2018年09月20日 12:54, [email protected] wrote:
On Thu, 2018-09-20 at 09:45 +0800, Hongxu Jia wrote:
I will fix it as my top priority today.
Reproduce steps:
- Build core-image-sato-sdk on qemuarm64
- Run qemu
- Log over ssh (openssh) failed
I did have a little bit of a look at this. It seems to hang during key
generation before starting the server during boot.
I am afraid it is the kernel issue
cat /dev/random will hung
On other system, cat /dev/random will have output
Openssl 1.1.x call getentropy, and getentropy call getrandom,
it hung at getrandom, here is a example reproduce steps
[test.c]
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/random.h>
int main(int argc, char *argv[])
{
char buf[4];
size_t buflen = sizeof(buf);
printf("%s %d\n", __FUNCTION__, __LINE__);
int res = getrandom(buf, buflen, 0);
printf("%s %d, getentropy %d, %s, 0x%02X 0x%02X 0x%02X 0x%02X\n",
__FUNCTION__, __LINE__,
res, strerror(errno), buf[0]&0xFF, buf[1]&0xFF, buf[2]&0xFF,
buf[3]&0xFF);
return 0;
}
[test.c]
$CC test.c -o test
On qemuarm64 target, run `test', it hung
root@qemuarm64:~# ./test_rand
main 10
On other system, it generate random number
$ ./test
main 10
main 12, getrandom 4, Success, 0x58 0xCD 0x3A 0x23
jiahongxu@jiahongxu-OptiPlex-990:~$ ./test
main 10
main 12, getrandom 4, Success, 0x8F 0x25 0x7E 0x9D
I am digging into kernel
//Hongxu
I had a suspicion that the problem could be a lack of entropy. We're
supposed to have the virtio entropy generation being passed through
from the host to avoid problems with entropy starvation but I'm not
sure its running for arm64.
I noticed the .config shows CONFIG_CRYPTO_DEV_VIRTIO=m but setting that
to =y didn't help. The virtio rng connects via pci bus iirc and
CONFIG_PCI isn't set so I'm now looking into that...
To update, adding this config to the kernel:
CONFIG_CRYPTO_DEV_VIRTIO=y
CONFIG_PCI=y
CONFIG_PCI_HOST_GENERIC=y
appears to solve the problem and lets my simple tests work. I'll have
to run some better tests but I think this is the problem, lack pci
support in the kernel meaning the rng virtio passthrough doesn't work.
Cheers,
Richard
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