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The mmaps made through the sys_util API are usually for guest memory or other large shared memory chunks that will pollute the file system with huge dumps on crash. By using MADV_DONTDUMP, we save the file system from storing these useless data segments when crosvm crashes. TEST=./build_test BUG=None Change-Id: I2041523648cd7c150bbdbfceef589f42d3f9c2b9 Reviewed-on: https://chromium-review.googlesource.com/890279 Commit-Ready: Zach Reizner <zachr@chromium.org> Tested-by: Zach Reizner <zachr@chromium.org> Reviewed-by: Stephen Barber <smbarber@chromium.org>
32 lines
711 B
Text
32 lines
711 B
Text
# Copyright 2017 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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close: 1
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dup: 1
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dup2: 1
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exit_group: 1
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futex: 1
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# Disallow mmap with PROT_EXEC set. The syntax here doesn't allow bit
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# negation, thus the manually negated mask constant.
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mmap: arg2 in 0xfffffffb
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mprotect: arg2 in 0xfffffffb
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# Allow MADV_DONTDUMP only.
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madvise: arg2 == 0x00000010
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munmap: 1
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read: 1
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recvfrom: 1
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sched_getaffinity: 1
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set_robust_list: 1
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sigaltstack: 1
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# Disallow clone's other than new threads.
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clone: arg0 & 0x00010000
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write: 1
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eventfd2: 1
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poll: 1
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ppoll: 1
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getpid: 1
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# Allow PR_SET_NAME only.
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prctl: arg0 == 15
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restart_syscall: 1
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