On Thu, Jan 03, 2019 at 04:47:31PM +0100, Michael Niewöhner wrote: > On Thu, 2019-01-03 at 17:04 +0200, Jarkko Sakkinen wrote: > > On Thu, Jan 03, 2019 at 02:38:11PM +0100, Michael Niewöhner wrote: > > > On Thu, 2019-01-03 at 15:27 +0200, Jarkko Sakkinen wrote: > > > > On Sun, Dec 23, 2018 at 12:55:12PM +0100, Michael Niewöhner wrote: > > > > > There is another issue but I don't know if both are related. Maybe > > > > > that's > > > > > just a > > > > > timing issue... > > > > > > > > > > root@debian:~# dd if=/dev/hwrng bs=1 count=1 > > > > > dd: error reading '/dev/hwrng': Operation not permitted > > > > > 0+0 records in > > > > > 0+0 records out > > > > > 0 bytes copied, 0.755958 s, 0.0 kB/s > > > > > root@debian:~# dd if=/dev/hwrng bs=1 count=1 | xxd; dd if=/dev/hwrng > > > > > bs=1 > > > > > count=1 | xxd > > > > > dd: error reading '/dev/hwrng': Operation not permitted > > > > > 0+0 records in > > > > > 0+0 records out > > > > > 0 bytes copied, 0.755697 s, 0.0 kB/s > > > > > 1+0 records in > > > > > 1+0 records out > > > > > 00000000: 52 R > > > > > 1 byte copied, 0.0106268 s, 0.1 kB/s > > > > > > > > > > > > > > > Michael > > > > > > > > What does /sys/devices/virtual/misc/hw_random/rng_current show? > > > > > > > > Did run commands as a sanity check on my laptop and seem to work. > > > > > > > > /Jarkko > > > > > > rng_current says "tpm-rng-0", which should be correct > > > > Is /dev/tpm0 accessible and usable? > > > > /Jarkko > > No, it does not seem to work: > > root@debian:~# tpm_version > Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17), > Communication failure > root@debian:~# tcsd -f > TCSD TDDL ioctl: (25) Inappropriate ioctl for device > TCSD TDDL Falling back to Read/Write device support. > TCSD TDDL ERROR: write to device /dev/tpm0 failed: Operation not permitted > TCSD TCS ERROR: TCS GetCapability failed with result = 0x1087 > root@debian:~# stat /dev/tpm0 > File: /dev/tpm0 > Size: 0 Blocks: 0 IO Block: 4096 character special > file > Device: 6h/6d Inode: 1114 Links: 1 Device type: a,e0 > Access: (0600/crw-------) Uid: ( 104/ tss) Gid: ( 112/ tss) > Access: 2019-01-03 16:39:20.627635333 +0100 > Modify: 2019-01-03 16:39:20.627635333 +0100 > Change: 2019-01-03 16:39:20.627635333 +0100 > Birth: - But those tools should not work because TrouSerS is for TPM 1.2. /Jarkko
