forked from lix-project/lix
559a504da7
For whatever reason, many programs trying to access SystemVersion.plist
also open SystemVersionCompat.plist; this includes Python code and
coreutils’ `cat(1)` (but not the native macOS `/bin/cat`). Illustratory
`dtruss(1m)` output:
open("/System/Library/CoreServices/SystemVersion.plist\0", 0x0, 0x0) = 3 0
open("/System/Library/CoreServices/SystemVersionCompat.plist\0", 0x0, 0x0) = 4 0
I assume this is a Big Sur change relating to the 10.16.x/11.x
version compatibility divide and that it’s something along the lines of
a hook inside libSystem.
Fixes a lot of sandboxed package builds under Big Sur.
100 lines
3.1 KiB
Plaintext
100 lines
3.1 KiB
Plaintext
(define TMPDIR (param "_GLOBAL_TMP_DIR"))
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(deny default)
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; Disallow creating setuid/setgid binaries, since that
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; would allow breaking build user isolation.
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(deny file-write-setugid)
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; Allow forking.
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(allow process-fork)
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; Allow reading system information like #CPUs, etc.
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(allow sysctl-read)
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; Allow POSIX semaphores and shared memory.
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(allow ipc-posix*)
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; Allow socket creation.
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(allow system-socket)
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; Allow sending signals within the sandbox.
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(allow signal (target same-sandbox))
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; Allow getpwuid.
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(allow mach-lookup (global-name "com.apple.system.opendirectoryd.libinfo"))
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; Access to /tmp.
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; The network-outbound/network-inbound ones are for unix domain sockets, which
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; we allow access to in TMPDIR (but if we allow them more broadly, you could in
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; theory escape the sandbox)
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(allow file* process-exec network-outbound network-inbound
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(literal "/tmp") (subpath TMPDIR))
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; Some packages like to read the system version.
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(allow file-read*
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(literal "/System/Library/CoreServices/SystemVersion.plist")
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(literal "/System/Library/CoreServices/SystemVersionCompat.plist"))
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; Without this line clang cannot write to /dev/null, breaking some configure tests.
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(allow file-read-metadata (literal "/dev"))
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; Many packages like to do local networking in their test suites, but let's only
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; allow it if the package explicitly asks for it.
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(if (param "_ALLOW_LOCAL_NETWORKING")
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(begin
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(allow network* (local ip) (local tcp) (local udp))
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; Allow access to /etc/resolv.conf (which is a symlink to
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; /private/var/run/resolv.conf).
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; TODO: deduplicate with sandbox-network.sb
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(allow file-read-metadata
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(literal "/var")
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(literal "/etc")
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(literal "/etc/resolv.conf")
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(literal "/private/etc/resolv.conf"))
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(allow file-read*
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(literal "/private/var/run/resolv.conf"))
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; Allow DNS lookups. This is even needed for localhost, which lots of tests rely on
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(allow file-read-metadata (literal "/etc/hosts"))
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(allow file-read* (literal "/private/etc/hosts"))
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(allow network-outbound (remote unix-socket (path-literal "/private/var/run/mDNSResponder")))))
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; Standard devices.
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(allow file*
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(literal "/dev/null")
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(literal "/dev/random")
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(literal "/dev/stdin")
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(literal "/dev/stdout")
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(literal "/dev/tty")
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(literal "/dev/urandom")
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(literal "/dev/zero")
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(subpath "/dev/fd"))
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; Allow pseudo-terminals.
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(allow file*
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(literal "/dev/ptmx")
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(regex #"^/dev/pty[a-z]+")
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(regex #"^/dev/ttys[0-9]+"))
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; Does nothing, but reduces build noise.
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(allow file* (literal "/dev/dtracehelper"))
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; Allow access to zoneinfo since libSystem needs it.
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(allow file-read* (subpath "/usr/share/zoneinfo"))
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(allow file-read* (subpath "/usr/share/locale"))
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; This is mostly to get more specific log messages when builds try to
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; access something in /etc or /var.
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(allow file-read-metadata
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(literal "/etc")
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(literal "/var")
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(literal "/private/var/tmp"))
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; This is used by /bin/sh on macOS 10.15 and later.
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(allow file*
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(literal "/private/var/select/sh"))
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