[tpm2] Re: tpm2_flushcontext stuck

Juergen Repp <Juergen.Repp at sit.fraunhofer.de>
Newsgroups dev.linux.lists.tpm2
Message-ID <[email protected]> 
I did check your commands on Raspian (also /dev/tpmrm0 was used):

tpm2_createprimary  -C o -g sha256 -G ecc -c primary.ctx
tpm2_getcap handles-transient (No handle is displayed, primary.ctx can be used)
tpm2_flushcontext 0x80000000
ERROR:tcti:src/util/io.c:108:write_all() failed to write to fd 3: Invalid argument 
ERROR:tcti:src/tss2-tcti/tcti-device.c:126:tcti_device_transmit() wrong number of bytes written. Expected 14, wrote 0.

So it seems to be a Problem with tcti_device_transmit. The write did return -1 if the handle does not exist.
If the TPM handle used for tpm2_flushcontext exists this error did not occur.

Do you also get no handle when executing getcap?:
tpm2_getcap handles-transient 


Am 18.12.21 um 00:58 schrieb Han:
> 
> On Fri, Dec 17, 2021 at 12:51 PM Roberts, William C <william.c.roberts(a)intel.com <mailto:william.c.roberts(a)intel.com>> wrote:
> 
>     I wonder if it's related to this bug, but manifesting itself differently:
>       - https://github.com/tpm2-software/tpm2-tools/issues/1356 <https://github.com/tpm2-software/tpm2-tools/issues/1356>
> 
> 
> Not sure. The bug is reported on "tpm2-tools" 3.1.3 with Linux kernel 5.0.  I'm using "tpm2-tools" 5.0 now with kernel 5.10.
>  
> 
>     What version of the tpm2-tss libraries are you running? Do commands like tpm2_getrandom work?
> 
> 
> There are multiple tss libs on my system (see below), but I think it is 3.0.3.  Yes commands like `tpm2_getrandom` work, including `tpm2_createprimary`. 
> 
> $ apt search tpm2 | grep tss
> 
> WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
> 
> libtss2-dev/stable 3.0.3-2 armhf
> libtss2-esys-3.0.2-0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-fapi1/stable 3.0.3-2 armhf
> libtss2-mu0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-rc0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-sys1/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-tcti-cmd0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-tcti-device0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-tcti-mssim0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-tcti-swtpm0/stable,now 3.0.3-2 armhf [installed,automatic]
> libtss2-tcti-tabrmd-dev/stable 2.3.3-1+b1 armhf
> libtss2-tcti-tabrmd0/stable 2.3.3-1+b1 armhf
> libtss2-tctildr0/stable,now 3.0.3-2 armhf [installed,automatic]
> 
>  
> 
>     ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>     *From:* Han <keepsimple(a)gmail.com <mailto:keepsimple(a)gmail.com>>
>     *Sent:* Friday, December 17, 2021 2:04 PM
>     *To:* Roberts, William C <william.c.roberts(a)intel.com <mailto:william.c.roberts(a)intel.com>>
>     *Cc:* tpm2(a)lists.01.org <mailto:tpm2(a)lists.01.org> <tpm2(a)lists.01.org <mailto:tpm2(a)lists.01.org>>
>     *Subject:* Re: [tpm2] tpm2_flushcontext stuck
>      
>     It seems stuck in a call of `poll()` at fd 3, which is /dev/tpmrm0 based on the log (see below).  The kernel version is 5.10.63.  Yes, I am using /dev/tpm0 and /dev/tpmrm0.  
> 
>     $ sudo strace tpm2_flushcontext 0x80000000
> 
>     <snip>
> 
>     openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
>     fstat64(3, {st_mode=S_IFREG|0644, st_size=72845, ...}) = 0
>     mmap2(NULL, 72845, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb6f74000
>     close(3)                                = 0
>     openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libtss2-tcti-device.so.0", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
>     read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\08\n\0\0004\0\0\0"..., 512) = 512
>     fstat64(3, {st_mode=S_IFREG|0644, st_size=22028, ...}) = 0
>     mmap2(NULL, 86236, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb5f22000
>     mprotect(0xb5f27000, 61440, PROT_NONE)  = 0
>     mmap2(0xb5f36000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0xb5f36000
>     close(3)                                = 0
>     mprotect(0xb5f36000, 4096, PROT_READ)   = 0
>     munmap(0xb6f74000, 72845)               = 0
>     openat(AT_FDCWD, "/dev/tpmrm0", O_RDWR|O_NONBLOCK) = 3
>     write(3, "\200\1\0\0\0\f\0\0\1{\0\10", 12) = 12
>     poll([{fd=3, events=POLLIN}], 1, 1000)  = 1 ([{fd=3, revents=POLLIN}])
>     read(3, "\200\1\0\0\0\24\0\0\0\0", 10)  = 10
>     poll([{fd=3, events=POLLIN}], 1, 1000)  = 1 ([{fd=3, revents=POLLIN}])
>     read(3, "\0\10Z\314k~c`I\346", 10)      = 10
>     futex(0xb6e7d35c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d360, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d364, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d380, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7ac9c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d280, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7b224, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7ad20, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     brk(0xda2000)                           = 0xda2000
>     futex(0xb6e7d368, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d384, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d3f8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d36c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     futex(0xb6e7d370, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>     write(3, "\200\1\0\0\0\16\0\0\1s\200\0\0\0", 14) = 14
>     poll([{fd=3, events=POLLIN}], 1, -1
> 
> 
> 
>     On Fri, Dec 17, 2021 at 10:29 AM Roberts, William C <william.c.roberts(a)intel.com <mailto:william.c.roberts(a)intel.com>> wrote:
> 
>         That's weird, could you strace it and see where it's hanging?
> 
>         What kernel version is that? I'm assuming your using the /dev/tpm0 or /dev/tpmrm0 device directly since I see the sudo.
>         ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>         *From:* Han <keepsimple(a)gmail.com <mailto:keepsimple(a)gmail.com>>
>         *Sent:* Wednesday, December 15, 2021 5:56 PM
>         *To:* tpm2(a)lists.01.org <mailto:tpm2(a)lists.01.org> <tpm2(a)lists.01.org <mailto:tpm2(a)lists.01.org>>
>         *Subject:* [tpm2] tpm2_flushcontext stuck
>          
>         Hi,
> 
>         I'm using tpm2-tools 5.0 in Debian 11 Bullseye based Raspberry Pi OS.  I'm trying to run tpm2_flushcontext but the command got stuck and it's not showing anything. Is the data in TPM corrupted?  How can I check? 
> 
>         $ sudo tpm2_flushcontext 0x80000000
>         < no output at all and stuck here >
> 
>         (note: the handle 0x80000000 was obtained from previous command output when I was running previous version tpm2-tools 3.1.3 on Debian 10 Buster based OS: 
> 
>         |$ sudo tpm2_createprimary -H o -g sha256 -G ecc -C context.out ObjectAttribute: 0x00030072 CreatePrimary Succeed ! Handle: 0x80000000) |
> 
> 
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