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Kernel: Disallow jail creation from a process within a jail

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We now disallow jail creation from a process within a jail because there
is simply no valid use case to allow it, and we will probably not enable
this behavior (which is considered a bug) again.

Although there was no "real" security issue with this bug, as a process
would still be denied to join that jail, there's an information reveal
about the amount of jails that are or were present in the system.
This commit is contained in:
Liav A 2022-11-11 01:58:35 +02:00 committed by Andrew Kaster
parent 6ff9a88c3b
commit 9559682f5c
Notes: sideshowbarker 2024-07-17 18:38:54 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/9559682f5c
Pull-request: https://github.com/SerenityOS/serenity/pull/16016
Reviewed-by: https://github.com/ADKaster ✅
1 changed files with 11 additions and 3 deletions
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14
Kernel/Syscalls/jail.cpp
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@ -25,9 +25,17 @@ ErrorOr<FlatPtr> Process::sys$jail_create(Userspace<Syscall::SC_jail_create_para
if (jail_name->length() > jail_name_max_size)
return ENAMETOOLONG;
auto jail = TRY(JailManagement::the().create_jail(move(jail_name)));
params.index = jail->index().value();
params.index = TRY(m_attached_jail.with([&](auto& my_jail) -> ErrorOr<u64> {
// Note: If we are already in a jail, don't let the process to be able to create other jails
// even if it will not be able to join them later on. The reason for this is to prevent as much as possible
// any info leak about the "outside world" jail metadata.
if (my_jail)
return Error::from_errno(EPERM);
auto jail = TRY(JailManagement::the().create_jail(move(jail_name)));
return jail->index().value();
}));
// Note: We do the copy_to_user outside of the m_attached_jail Spinlock locked scope because
// we rely on page faults to work properly.
TRY(copy_to_user(user_params, &params));
return 0;
}