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https://chromium.googlesource.com/crosvm/crosvm
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9f86c7a221
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>
58 lines
938 B
Text
58 lines
938 B
Text
# Copyright 2018 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# common policy
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brk: 1
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clone: arg0 & CLONE_THREAD
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close: 1
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dup2: 1
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dup: 1
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epoll_create1: 1
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epoll_ctl: 1
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epoll_wait: 1
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eventfd2: 1
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exit: 1
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exit_group: 1
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futex: 1
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getpid: 1
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gettimeofday: 1
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kill: 1
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madvise: arg2 == MADV_DONTNEED || arg2 == MADV_DONTDUMP || arg2 == MADV_REMOVE
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mmap: arg2 in ~PROT_EXEC
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mprotect: arg2 in ~PROT_EXEC
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mremap: 1
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munmap: 1
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nanosleep: 1
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#open: return ENOENT
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#openat: return ENOENT
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pipe2: 1
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poll: 1
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ppoll: 1
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prctl: arg0 == PR_SET_NAME
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read: 1
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recvfrom: 1
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recvmsg: 1
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restart_syscall: 1
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rt_sigaction: 1
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rt_sigprocmask: 1
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rt_sigreturn: 1
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sched_getaffinity: 1
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sendmsg: 1
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set_robust_list: 1
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sigaltstack: 1
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write: 1
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# tpm-specific policy
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chdir: 1
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fstat: 1
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fsync: 1
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ftruncate: 1
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getuid: 1
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lseek: 1
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mkdir: 1
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open: 1
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openat: 1
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socket: return EACCES
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stat: 1
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