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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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3
Kernel/Syscall.h
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@ -147,7 +147,8 @@ typedef u32 socklen_t;
__ENUMERATE_SYSCALL(get_kernel_info_page) \
__ENUMERATE_SYSCALL(futex) \
__ENUMERATE_SYSCALL(set_thread_boost) \
__ENUMERATE_SYSCALL(set_process_boost)
__ENUMERATE_SYSCALL(set_process_boost) \
__ENUMERATE_SYSCALL(chroot)
namespace Syscall {