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Kernel: Use Process::credentials() and remove user ID/group ID helpers

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Move away from using the group ID/user ID helpers in the process to
allow for us to take advantage of the immutable credentials instead.
This commit is contained in:
Anthony Iacono 2022-08-20 18:21:01 -04:00 • committed by Andreas Kling
parent 8026d8926c
commit f86b671de2
27 changed files with 109 additions and 94 deletions
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10
Kernel/Syscalls/mount.cpp
View file

@ -70,7 +70,8 @@ ErrorOr<FlatPtr> Process::sys$mount(Userspace<Syscall::SC_mount_params const*> u
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
TRY(require_no_promises());
if (!is_superuser())
auto credentials = this->credentials();
if (!credentials->is_superuser())
return EPERM;
auto params = TRY(copy_typed_from_user(user_params));
@ -86,7 +87,7 @@ ErrorOr<FlatPtr> Process::sys$mount(Userspace<Syscall::SC_mount_params const*> u
else
dbgln("mount {} @ {}", fs_type, target);
auto target_custody = TRY(VirtualFileSystem::the().resolve_path(credentials(), target->view(), current_directory()));
auto target_custody = TRY(VirtualFileSystem::the().resolve_path(credentials, target->view(), current_directory()));
if (params.flags & MS_REMOUNT) {
// We're not creating a new mount, we're updating an existing one!
@ -126,13 +127,14 @@ ErrorOr<FlatPtr> Process::sys$mount(Userspace<Syscall::SC_mount_params const*> u
ErrorOr<FlatPtr> Process::sys$umount(Userspace<char const*> user_mountpoint, size_t mountpoint_length)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
if (!is_superuser())
auto credentials = this->credentials();
if (!credentials->is_superuser())
return EPERM;
TRY(require_no_promises());
auto mountpoint = TRY(get_syscall_path_argument(user_mountpoint, mountpoint_length));
auto custody = TRY(VirtualFileSystem::the().resolve_path(credentials(), mountpoint->view(), current_directory()));
auto custody = TRY(VirtualFileSystem::the().resolve_path(credentials, mountpoint->view(), current_directory()));
auto& guest_inode = custody->inode();
TRY(VirtualFileSystem::the().unmount(guest_inode));
return 0;