The crosvm TPM process calls ssleay_rand_bytes(), which in some cases
attempts to acquire entropy through an EGD ("entropy gathering daemon")
- see OpenSSL's RAND_query_egd_bytes(). Attempting to communicate with
this daemon by creating a socket would cause the process to exit
currently because the syscall whitelist did not allow socket() or
connect().
Since we don't have an EGD and don't want to expose it to the sandboxed
TPM process anyway, modify the TPM seccomp policy to cause socket() to
return an error rather than aborting.
BUG=None
TEST=`vmc start --software-tpm termina`
Change-Id: Ib7c6bceced0f6cbe7199614ece8446aa300cec1e
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1684411
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Vadim Sukhomlinov <sukhomlinov@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
There is no such syscall as fseek as far as I can tell. There is lseek,
which would be how fseek is implemented in libc, and it is already
included in the policy.
BUG=chromium:936633
TEST=parse_seccomp_policy seccomp/x86_64/tpm_device.policy
Change-Id: Ifb891395d7447d8b81cb1b17af18c49e5d5fc96f
Reviewed-on: https://chromium-review.googlesource.com/1518490
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested by running the following on a grunt board (Barla) in dev mode
together with CL:1496910:
sudo crosvm run \
--root rootfs.ext4 \
--socket crosvm.sock \
--seccomp-policy-dir seccomp \
--software-tpm \
-p init=/bin/bash \
-p panic=-1 \
vmlinux.bin
and confirming that /dev/tpm0 and /dev/tpmrm0 are present in the VM.
I needed to override the common device policy's `open` and `openat` and
was not able to get that working with the existing @include.
Note: untested on arm.
BUG=chromium:921841
TEST=manual testing on grunt
Change-Id: Ied7f18a631ce8c0ae280f8b6c01511ca20c3d1c8
Reviewed-on: https://chromium-review.googlesource.com/1496909
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>
This CL adds a "tpm" Cargo cfg to crosvm which enables a TPM device
backed by libtpm2 simulator.
Tested by running the following inside cros_sdk:
LIBRARY_PATH=~/src/minijail LD_LIBRARY_PATH=~/src/minijail \
cargo run --release \
--features tpm \
-- \
run \
-r rootfs.ext4 \
--seccomp-policy-dir seccomp/x86_64/ \
-p init=/bin/bash \
-p panic=-1 \
--disable-sandbox \
vmlinux.bin
with a Linux image built from CL:1387655.
The TPM self test completes successfully with the following output:
https://paste.googleplex.com/5996075978588160?raw
Justin's TPM playground runs with the following trace output.
https://paste.googleplex.com/4909751007707136?raw
Design doc: go/vtpm-for-glinux
TEST=ran TPM playground program inside crosvm
TEST=local kokoro
BUG=chromium:911799
Change-Id: I2feb24a3e38cba91f62c6d2cd1f378de4dd03ecf
Reviewed-on: https://chromium-review.googlesource.com/1387624
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
