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Kernel: Let MouseDevice and KeyboardDevice write method return EINVAL

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Currently, writing anything to `/dev/mouse0` or `/dev/keyboard0` causes
the Kernel to panic. The reason for this is that
`[Mouse,Keyboard]Device::write` always returns 0, which is explicitly
prohibited by `VERIFY` macro in `Process::sys$write`.  The fix seems
trivial; `write` should return EINVAL instead (as is the case with, for
example, `KCOVDevice`).
This commit is contained in:
Przemysław R. Kusiak 2021-09-18 04:07:19 +02:00 committed by Idan Horowitz
parent 6e1f6bd684
commit c6e23e45c5
Notes: sideshowbarker 2024-07-19 17:12:34 +09:00 
Author: https://github.com/allvpv 🔰
Commit: https://github.com/SerenityOS/serenity/commit/c6e23e45c58
Pull-request: https://github.com/SerenityOS/serenity/pull/10105
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
4 changed files with 2 additions and 12 deletions
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5
Kernel/Devices/HID/KeyboardDevice.cpp
View File

@ -306,11 +306,6 @@ KResultOr<size_t> KeyboardDevice::read(OpenFileDescription&, u64, UserOrKernelBu
return nread;
}
KResultOr<size_t> KeyboardDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t)
{
return 0;
}
KResult KeyboardDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
switch (request) {

2
Kernel/Devices/HID/KeyboardDevice.h
View File

@ -27,7 +27,7 @@ public:
// ^CharacterDevice
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
// ^HIDDevice

5
Kernel/Devices/HID/MouseDevice.cpp
View File

@ -48,9 +48,4 @@ KResultOr<size_t> MouseDevice::read(OpenFileDescription&, u64, UserOrKernelBuffe
return nread;
}
KResultOr<size_t> MouseDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t)
{
return 0;
}
}

2
Kernel/Devices/HID/MouseDevice.h
View File

@ -25,7 +25,7 @@ public:
// ^CharacterDevice
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
// ^HIDDevice