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Kernel/Syscalls: Use copy_n_to_user when applicable

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copy_to_user() with bytes as the last argument could be changed to using
copy_n_to_user() with a count.
This commit is contained in:
Pankaj Raghav 2023-03-24 09:59:28 +01:00 • committed by Andreas Kling
parent f32fde6152
commit d0ac24ddbf
5 changed files with 10 additions and 9 deletions
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2
Kernel/Syscalls/getuid.cpp
View file

@ -83,7 +83,7 @@ ErrorOr<FlatPtr> Process::sys$getgroups(size_t count, Userspace<GroupID*> user_g
return credentials->extra_gids().size();
if (count != credentials->extra_gids().size())
return EINVAL;
TRY(copy_to_user(user_gids, credentials->extra_gids().data(), sizeof(GroupID) * count));
TRY(copy_n_to_user(user_gids, credentials->extra_gids().data(), count));
return 0;
}

10
Kernel/Syscalls/keymap.cpp
View file

@ -50,11 +50,11 @@ ErrorOr<FlatPtr> Process::sys$getkeymap(Userspace<Syscall::SC_getkeymap_params c
TRY(copy_to_user(params.map_name.data, keymap_data.character_map_name->characters(), keymap_data.character_map_name->length()));
auto const& character_maps = keymap_data.character_map;
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)));
TRY(copy_n_to_user(params.map, character_maps.map, CHAR_MAP_SIZE));
TRY(copy_n_to_user(params.shift_map, character_maps.shift_map, CHAR_MAP_SIZE));
TRY(copy_n_to_user(params.alt_map, character_maps.alt_map, CHAR_MAP_SIZE));
TRY(copy_n_to_user(params.altgr_map, character_maps.altgr_map, CHAR_MAP_SIZE));
TRY(copy_n_to_user(params.shift_altgr_map, character_maps.shift_altgr_map, CHAR_MAP_SIZE));
return 0;
});
}

3
Kernel/Syscalls/pipe.cpp
View file

@ -43,7 +43,8 @@ ErrorOr<FlatPtr> Process::sys$pipe(Userspace<int*> pipefd, int flags)
reader_fd_allocation.fd,
writer_fd_allocation.fd,
};
if (copy_to_user(pipefd, fds_for_userspace, sizeof(fds_for_userspace)).is_error()) {
if (copy_n_to_user(pipefd, fds_for_userspace, 2).is_error()) {
// Avoid leaking both file descriptors on error.
fds[reader_fd_allocation.fd] = {};
fds[writer_fd_allocation.fd] = {};
return EFAULT;

2
Kernel/Syscalls/poll.cpp
View file

@ -131,7 +131,7 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
}
if (params.nfds > 0)
TRY(copy_to_user(&params.fds[0], fds_copy.data(), params.nfds * sizeof(pollfd)));
TRY(copy_n_to_user(&params.fds[0], fds_copy.data(), params.nfds));
return fds_with_revents;
}

2
Kernel/Syscalls/socket.cpp
View file

@ -428,7 +428,7 @@ ErrorOr<FlatPtr> Process::sys$socketpair(Userspace<Syscall::SC_socketpair_params
setup_socket_fd(fds, allocated_fds[0], pair.description0, params.type);
setup_socket_fd(fds, allocated_fds[1], pair.description1, params.type);
if (copy_to_user(params.sv, allocated_fds, sizeof(allocated_fds)).is_error()) {
if (copy_n_to_user(params.sv, allocated_fds, 2).is_error()) {
// Avoid leaking both file descriptors on error.
fds[allocated_fds[0]] = {};
fds[allocated_fds[1]] = {};