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Kernel: Make copy_{from,to}_user() return KResult and use TRY()

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This makes EFAULT propagation flow much more naturally. :^)
This commit is contained in:
Andreas Kling 2021-09-05 17:38:37 +02:00
parent 9903f5c6ef
commit 48a0b31c47
57 changed files with 318 additions and 551 deletions
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44
Kernel/Syscalls/keymap.cpp
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@ -20,21 +20,15 @@ KResultOr<FlatPtr> Process::sys$setkeymap(Userspace<const Syscall::SC_setkeymap_
return EPERM;
Syscall::SC_setkeymap_params params;
if (!copy_from_user(&params, user_params))
return EFAULT;
TRY(copy_from_user(&params, user_params));
Keyboard::CharacterMapData character_map_data;
if (!copy_n_from_user(character_map_data.map, params.map, CHAR_MAP_SIZE))
return EFAULT;
if (!copy_n_from_user(character_map_data.shift_map, params.shift_map, CHAR_MAP_SIZE))
return EFAULT;
if (!copy_n_from_user(character_map_data.alt_map, params.alt_map, CHAR_MAP_SIZE))
return EFAULT;
if (!copy_n_from_user(character_map_data.altgr_map, params.altgr_map, CHAR_MAP_SIZE))
return EFAULT;
if (!copy_n_from_user(character_map_data.shift_altgr_map, params.shift_altgr_map, CHAR_MAP_SIZE))
return EFAULT;
TRY(copy_n_from_user(character_map_data.map, params.map, CHAR_MAP_SIZE));
TRY(copy_n_from_user(character_map_data.shift_map, params.shift_map, CHAR_MAP_SIZE));
TRY(copy_n_from_user(character_map_data.alt_map, params.alt_map, CHAR_MAP_SIZE));
TRY(copy_n_from_user(character_map_data.altgr_map, params.altgr_map, CHAR_MAP_SIZE));
TRY(copy_n_from_user(character_map_data.shift_altgr_map, params.shift_altgr_map, CHAR_MAP_SIZE));
auto map_name = get_syscall_path_argument(params.map_name);
if (map_name.is_error())
@ -51,30 +45,22 @@ KResultOr<FlatPtr> Process::sys$getkeymap(Userspace<const Syscall::SC_getkeymap_
VERIFY_NO_PROCESS_BIG_LOCK(this);
REQUIRE_PROMISE(getkeymap);
Syscall::SC_getkeymap_params params;
if (!copy_from_user(&params, user_params))
return EFAULT;
Syscall::SC_getkeymap_params params {};
TRY(copy_from_user(&params, user_params));
String keymap_name = HIDManagement::the().keymap_name();
const Keyboard::CharacterMapData& character_maps = HIDManagement::the().character_maps();
if (!copy_to_user(params.map, character_maps.map, CHAR_MAP_SIZE * sizeof(u32)))
return EFAULT;
if (!copy_to_user(params.shift_map, character_maps.shift_map, CHAR_MAP_SIZE * sizeof(u32)))
return EFAULT;
if (!copy_to_user(params.alt_map, character_maps.alt_map, CHAR_MAP_SIZE * sizeof(u32)))
return EFAULT;
if (!copy_to_user(params.altgr_map, character_maps.altgr_map, CHAR_MAP_SIZE * sizeof(u32)))
return EFAULT;
if (!copy_to_user(params.shift_altgr_map, character_maps.shift_altgr_map, CHAR_MAP_SIZE * sizeof(u32)))
return EFAULT;
TRY(copy_to_user(params.map, character_maps.map, CHAR_MAP_SIZE * sizeof(u32)));
TRY(copy_to_user(params.shift_map, character_maps.shift_map, CHAR_MAP_SIZE * sizeof(u32)));
TRY(copy_to_user(params.alt_map, character_maps.alt_map, CHAR_MAP_SIZE * sizeof(u32)));
TRY(copy_to_user(params.altgr_map, character_maps.altgr_map, CHAR_MAP_SIZE * sizeof(u32)));
TRY(copy_to_user(params.shift_altgr_map, character_maps.shift_altgr_map, CHAR_MAP_SIZE * sizeof(u32)));
if (params.map_name.size < keymap_name.length())
return ENAMETOOLONG;
if (!copy_to_user(params.map_name.data, keymap_name.characters(), keymap_name.length()))
return EFAULT;
return 0;
TRY(copy_to_user(params.map_name.data, keymap_name.characters(), keymap_name.length()));
return KSuccess;
}
}