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Kernel: Add a basic chroot() syscall :^)

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The chroot() syscall now allows the superuser to isolate a process into
a specific subtree of the filesystem. This is not strictly permanent,
as it is also possible for a superuser to break *out* of a chroot, but
it is a useful mechanism for isolating unprivileged processes.

The VFS now uses the current process's root_directory() as the root for
path resolution purposes. The root directory is stored as an uncached
Custody in the Process object.
This commit is contained in:
Andreas Kling 2020-01-10 23:14:04 +01:00
parent 944fbf507a
commit ddd0b19281
7 changed files with 63 additions and 8 deletions
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2
Kernel/init.cpp
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@ -145,6 +145,8 @@ VFS* vfs;
hang();
}
current->process().set_root_directory(vfs->root_custody());
dbgprintf("Load ksyms\n");
load_ksyms();
dbgprintf("Loaded ksyms\n");