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98254a7c1f
This change reconciles our pledge() implementation with the OpenBSD
kernel source code. We now a polyfill that's much closer to OpenBSD's
behavior. For example, it was discovered that "stdio" permits threads.
There were a bunch of Linux system calls that needed to be added, like
sched_yield(). The exec / execnative category division is now dropped.
We're instead using OpenBSD's "prot_exec" promise for launching APE
binaries and dynamic shared objects. We also now filter clone() flags.
The pledge.com command has been greatly improved. It now does unveiling
by default when Landlock is available. It's now smart enough to unveil a
superset of paths that OpenBSD automatically unveils with pledge(), such
as /etc/localtime. pledge.com also now checks if the executable being
launched is a dynamic shared object, in which case it unveils libraries.
These changes now make it possible to pledge curl on ubuntu 20.04 glibc:
pledge.com -p 'stdio rpath prot_exec inet dns tty sendfd recvfd' \
curl -s https://justine.lol/hello.txt
Here's what pledging curl on Alpine 3.16 with Musl Libc looks like:
pledge.com -p 'stdio rpath prot_exec dns inet' \
curl -s https://justine.lol/hello.txt
Here's what pledging curl.com w/ ape loader looks like:
pledge.com -p 'stdio rpath prot_exec dns inet' \
o//examples/curl.com https://justine.lol/hello.txt
The most secure sandbox, is curl.com converted to static ELF:
o//tool/build/assimilate.com o//examples/curl.com
pledge.com -p 'stdio rpath dns inet' \
o//examples/curl.com https://justine.lol/hello.txt
A weird corner case needed to be handled when resolving symbolic links
during the unveiling process, that's arguably a Landlock bug. It's not
surprising since Musl and Glibc are also inconsistent here too.
22 lines
828 B
C
22 lines
828 B
C
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_CLONE_H_
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#define COSMOPOLITAN_LIBC_SYSV_CONSTS_CLONE_H_
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#define CLONE_VM 0x00000100
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#define CLONE_FS 0x00000200
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#define CLONE_FILES 0x00000400
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#define CLONE_SIGHAND 0x00000800
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#define CLONE_PTRACE 0x00002000
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#define CLONE_VFORK 0x00004000
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#define CLONE_PARENT 0x00008000
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#define CLONE_THREAD 0x00010000
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#define CLONE_NEWNS 0x00020000
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#define CLONE_SYSVSEM 0x00040000
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#define CLONE_SETTLS 0x00080000
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#define CLONE_PARENT_SETTID 0x00100000
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#define CLONE_CHILD_CLEARTID 0x00200000
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#define CLONE_DETACHED 0x00400000
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#define CLONE_UNTRACED 0x00800000
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#define CLONE_CHILD_SETTID 0x01000000
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#define CLONE_STOPPED 0x02000000
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#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_CLONE_H_ */
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