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Kernel: Use Userspace<T> for the getsockopt syscall and Socket interface

Browse Source 
The way getsockopt is implemented for socket types requires us to push
down Userspace<T> using into those interfaces. This change does so, and
utilizes proper copy implementations instead of the kind of haphazard
pointer dereferencing that was occurring there before.
This commit is contained in:
Brian Gianforcaro 2020-08-07 02:29:05 -07:00 committed by Andreas Kling
parent 6920d5f423
commit 30b2c0dc85
Notes: sideshowbarker 2024-07-19 04:09:46 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/30b2c0dc850
Pull-request: https://github.com/SerenityOS/serenity/pull/3039
9 changed files with 69 additions and 43 deletions
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4
Kernel/API/Syscall.h
View File

@ -306,8 +306,8 @@ struct SC_getsockopt_params {
int sockfd;
int level;
int option;
void* value;
socklen_t* value_size;
Userspace<void*> value;
Userspace<socklen_t*> value_size;
};
struct SC_setsockopt_params {

12
Kernel/Net/IPv4Socket.cpp
View File

@ -451,16 +451,22 @@ KResult IPv4Socket::setsockopt(int level, int option, Userspace<const void*> use
}
}
KResult IPv4Socket::getsockopt(FileDescription& description, int level, int option, void* value, socklen_t* value_size)
KResult IPv4Socket::getsockopt(FileDescription& description, int level, int option, Userspace<void*> value, Userspace<socklen_t*> value_size)
{
if (level != IPPROTO_IP)
return Socket::getsockopt(description, level, option, value, value_size);
socklen_t size;
if (!Process::current()->validate_read_and_copy_typed(&size, value_size))
return KResult(-EFAULT);
switch (option) {
case IP_TTL:
if (*value_size < sizeof(int))
if (size < sizeof(int))
return KResult(-EINVAL);
*(int*)value = m_ttl;
copy_to_user(static_ptr_cast<int*>(value), (int*)&m_ttl);
size = sizeof(int);
copy_to_user(value_size, &size);
return KSuccess;
default:
return KResult(-ENOPROTOOPT);

2
Kernel/Net/IPv4Socket.h
View File

@ -61,7 +61,7 @@ public:
virtual KResultOr<size_t> sendto(FileDescription&, const void*, size_t, int, const sockaddr*, socklen_t) override;
virtual KResultOr<size_t> recvfrom(FileDescription&, void*, size_t, int flags, sockaddr*, socklen_t*) override;
virtual KResult setsockopt(int level, int option, Userspace<const void*>, socklen_t) override;
virtual KResult getsockopt(FileDescription&, int level, int option, void*, socklen_t*) override;
virtual KResult getsockopt(FileDescription&, int level, int option, Userspace<void*>, Userspace<socklen_t*>) override;
virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;

20
Kernel/Net/LocalSocket.cpp
View File

@ -344,24 +344,30 @@ String LocalSocket::absolute_path(const FileDescription& description) const
return builder.to_string();
}
KResult LocalSocket::getsockopt(FileDescription& description, int level, int option, void* value, socklen_t* value_size)
KResult LocalSocket::getsockopt(FileDescription& description, int level, int option, Userspace<void*> value, Userspace<socklen_t*> value_size)
{
if (level != SOL_SOCKET)
return Socket::getsockopt(description, level, option, value, value_size);
socklen_t size;
if (!Process::current()->validate_read_and_copy_typed(&size, value_size))
return KResult(-EFAULT);
switch (option) {
case SO_PEERCRED: {
if (*value_size < sizeof(ucred))
if (size < sizeof(ucred))
return KResult(-EINVAL);
auto& creds = *(ucred*)value;
switch (role(description)) {
case Role::Accepted:
creds = m_origin;
*value_size = sizeof(ucred);
copy_to_user(static_ptr_cast<ucred*>(value), &m_origin);
size = sizeof(ucred);
copy_to_user(value_size, &size);
return KSuccess;
case Role::Connected:
creds = m_acceptor;
*value_size = sizeof(ucred);
copy_to_user(static_ptr_cast<ucred*>(value), &m_acceptor);
size = sizeof(ucred);
copy_to_user(value_size, &size);
return KSuccess;
case Role::Connecting:
return KResult(-ENOTCONN);

2
Kernel/Net/LocalSocket.h
View File

@ -62,7 +62,7 @@ public:
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> sendto(FileDescription&, const void*, size_t, int, const sockaddr*, socklen_t) override;
virtual KResultOr<size_t> recvfrom(FileDescription&, void*, size_t, int flags, sockaddr*, socklen_t*) override;
virtual KResult getsockopt(FileDescription&, int level, int option, void*, socklen_t*) override;
virtual KResult getsockopt(FileDescription&, int level, int option, Userspace<void*>, Userspace<socklen_t*>) override;
virtual KResult chown(FileDescription&, uid_t, gid_t) override;
virtual KResult chmod(FileDescription&, mode_t) override;

42
Kernel/Net/Socket.cpp
View File

@ -137,40 +137,52 @@ KResult Socket::setsockopt(int level, int option, Userspace<const void*> user_va
}
}
KResult Socket::getsockopt(FileDescription&, int level, int option, void* value, socklen_t* value_size)
KResult Socket::getsockopt(FileDescription&, int level, int option, Userspace<void*> value, Userspace<socklen_t*> value_size)
{
socklen_t size;
if (!Process::current()->validate_read_and_copy_typed(&size, value_size))
return KResult(-EFAULT);
ASSERT(level == SOL_SOCKET);
switch (option) {
case SO_SNDTIMEO:
if (*value_size < sizeof(timeval))
if (size < sizeof(timeval))
return KResult(-EINVAL);
*(timeval*)value = m_send_timeout;
*value_size = sizeof(timeval);
copy_to_user(static_ptr_cast<timeval*>(value), &m_send_timeout);
size = sizeof(timeval);
copy_to_user(value_size, &size);
return KSuccess;
case SO_RCVTIMEO:
if (*value_size < sizeof(timeval))
if (size < sizeof(timeval))
return KResult(-EINVAL);
*(timeval*)value = m_receive_timeout;
*value_size = sizeof(timeval);
copy_to_user(static_ptr_cast<timeval*>(value), &m_receive_timeout);
size = sizeof(timeval);
copy_to_user(value_size, &size);
return KSuccess;
case SO_ERROR:
if (*value_size < sizeof(int))
case SO_ERROR: {
if (size < sizeof(int))
return KResult(-EINVAL);
dbg() << "getsockopt(SO_ERROR): FIXME!";
*(int*)value = 0;
*value_size = sizeof(int);
int errno = 0;
copy_to_user(static_ptr_cast<int*>(value), &errno);
size = sizeof(int);
copy_to_user(value_size, &size);
return KSuccess;
}
case SO_BINDTODEVICE:
if (*value_size < IFNAMSIZ)
if (size < IFNAMSIZ)
return KResult(-EINVAL);
if (m_bound_interface) {
const auto& name = m_bound_interface->name();
auto length = name.length() + 1;
memcpy(value, name.characters(), length);
*value_size = length;
copy_to_user(static_ptr_cast<char*>(value), name.characters(), length);
size = length;
copy_to_user(value_size, &size);
return KSuccess;
} else {
*value_size = 0;
size = 0;
copy_to_user(value_size, &size);
return KResult(-EFAULT);
}
default:

2
Kernel/Net/Socket.h
View File

@ -111,7 +111,7 @@ public:
virtual KResultOr<size_t> recvfrom(FileDescription&, void*, size_t, int flags, sockaddr*, socklen_t*) = 0;
virtual KResult setsockopt(int level, int option, Userspace<const void*>, socklen_t);
virtual KResult getsockopt(FileDescription&, int level, int option, void*, socklen_t*);
virtual KResult getsockopt(FileDescription&, int level, int option, Userspace<void*>, Userspace<socklen_t*>);
pid_t origin_pid() const { return m_origin.pid; }
uid_t origin_uid() const { return m_origin.uid; }

2
Kernel/Process.h
View File

@ -295,7 +295,7 @@ public:
int sys$shutdown(int sockfd, int how);
ssize_t sys$sendto(const Syscall::SC_sendto_params*);
ssize_t sys$recvfrom(const Syscall::SC_recvfrom_params*);
int sys$getsockopt(const Syscall::SC_getsockopt_params*);
int sys$getsockopt(Userspace<const Syscall::SC_getsockopt_params*>);
int sys$setsockopt(Userspace<const Syscall::SC_setsockopt_params*>);
int sys$getsockname(Userspace<const Syscall::SC_getsockname_params*>);
int sys$getpeername(Userspace<const Syscall::SC_getpeername_params*>);

26
Kernel/Syscalls/socket.cpp
View File

@ -316,22 +316,24 @@ int Process::sys$getpeername(Userspace<const Syscall::SC_getpeername_params*> us
return get_sock_or_peer_name<false>(params);
}
int Process::sys$getsockopt(const Syscall::SC_getsockopt_params* params)
int Process::sys$getsockopt(Userspace<const Syscall::SC_getsockopt_params*> user_params)
{
if (!validate_read_typed(params))
Syscall::SC_getsockopt_params params;
if (!validate_read_and_copy_typed(&params, user_params))
return -EFAULT;
SmapDisabler disabler;
int sockfd = params.sockfd;
int level = params.level;
int option = params.option;
Userspace<void*> user_value = params.value;
Userspace<socklen_t*> user_value_size = params.value_size;
int sockfd = params->sockfd;
int level = params->level;
int option = params->option;
void* value = params->value;
socklen_t* value_size = params->value_size;
if (!validate_write_typed(value_size))
if (!validate_write_typed(user_value_size))
return -EFAULT;
if (!validate_write(value, *value_size))
socklen_t value_size;
if (!validate_read_and_copy_typed(&value_size, user_value_size))
return -EFAULT;
if (!validate_write(user_value, value_size))
return -EFAULT;
auto description = file_description(sockfd);
if (!description)
@ -345,7 +347,7 @@ int Process::sys$getsockopt(const Syscall::SC_getsockopt_params* params)
} else {
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
}
return socket.getsockopt(*description, level, option, value, value_size);
return socket.getsockopt(*description, level, option, user_value, user_value_size);
}
int Process::sys$setsockopt(Userspace<const Syscall::SC_setsockopt_params*> user_params)