tpm: Update tpm device policy to support libtpm2

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>

2 files changed, 107 insertions, 2 deletions

diff --git a/seccomp/arm/tpm_device.policy b/seccomp/arm/tpm_device.policy
index 4f7aafd..fa644a8 100644
--- a/seccomp/arm/tpm_device.policy
+++ b/seccomp/arm/tpm_device.policy
@@ -2,4 +2,57 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-@include /usr/share/policy/crosvm/common_device.policy
+# common policy
+brk: 1
+clone: arg0 & CLONE_THREAD
+close: 1
+dup2: 1
+dup: 1
+epoll_create1: 1
+epoll_ctl: 1
+epoll_wait: 1
+eventfd2: 1
+exit: 1
+exit_group: 1
+futex: 1
+getpid: 1
+gettimeofday: 1
+kill: 1
+madvise: arg2 == MADV_DONTNEED || arg2 == MADV_DONTDUMP || arg2 == MADV_REMOVE
+mmap2: arg2 in ~PROT_EXEC
+mprotect: arg2 in ~PROT_EXEC
+mremap: 1
+munmap: 1
+nanosleep: 1
+#open: return ENOENT
+#openat: return ENOENT
+pipe2: 1
+poll: 1
+ppoll: 1
+prctl: arg0 == PR_SET_NAME
+read: 1
+recv: 1
+recvfrom: 1
+recvmsg: 1
+restart_syscall: 1
+rt_sigaction: 1
+rt_sigprocmask: 1
+rt_sigreturn: 1
+sched_getaffinity: 1
+sendmsg: 1
+set_robust_list: 1
+sigaltstack: 1
+write: 1
+
+# tpm-specific policy
+chdir: 1
+fseek: 1
+fstat: 1
+fsync: 1
+ftruncate: 1
+getuid: 1
+lseek: 1
+mkdir: 1
+open: 1
+openat: 1
+stat: 1
diff --git a/seccomp/x86_64/tpm_device.policy b/seccomp/x86_64/tpm_device.policy
index 4f7aafd..f290c4e 100644
--- a/seccomp/x86_64/tpm_device.policy
+++ b/seccomp/x86_64/tpm_device.policy
@@ -2,4 +2,56 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-@include /usr/share/policy/crosvm/common_device.policy
+# common policy
+brk: 1
+clone: arg0 & CLONE_THREAD
+close: 1
+dup2: 1
+dup: 1
+epoll_create1: 1
+epoll_ctl: 1
+epoll_wait: 1
+eventfd2: 1
+exit: 1
+exit_group: 1
+futex: 1
+getpid: 1
+gettimeofday: 1
+kill: 1
+madvise: arg2 == MADV_DONTNEED || arg2 == MADV_DONTDUMP || arg2 == MADV_REMOVE
+mmap: arg2 in ~PROT_EXEC
+mprotect: arg2 in ~PROT_EXEC
+mremap: 1
+munmap: 1
+nanosleep: 1
+#open: return ENOENT
+#openat: return ENOENT
+pipe2: 1
+poll: 1
+ppoll: 1
+prctl: arg0 == PR_SET_NAME
+read: 1
+recvfrom: 1
+recvmsg: 1
+restart_syscall: 1
+rt_sigaction: 1
+rt_sigprocmask: 1
+rt_sigreturn: 1
+sched_getaffinity: 1
+sendmsg: 1
+set_robust_list: 1
+sigaltstack: 1
+write: 1
+
+# tpm-specific policy
+chdir: 1
+fseek: 1
+fstat: 1
+fsync: 1
+ftruncate: 1
+getuid: 1
+lseek: 1
+mkdir: 1
+open: 1
+openat: 1
+stat: 1