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Kernel: Combine validate and copy of user mode pointers (#1069)

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Right now there is a significant amount of boiler plate code required
to validate user mode parameters in syscalls. In an attempt to reduce
this a bit, introduce validate_read_and_copy_typed which combines the
usermode address check and does the copy internally if the validation
passes. This cleans up a little bit of code from a significant amount
of syscalls.
This commit is contained in:
Brian Gianforcaro 2020-01-13 02:19:18 -08:00 • committed by Andreas Kling
parent 9cac205d67
commit 4cee441279
2 changed files with 55 additions and 66 deletions
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9
Kernel/Process.h
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@ -285,6 +285,15 @@ public:
template<typename T>
bool validate_read_typed(T* value, size_t count = 1) { return validate_read(value, sizeof(T) * count); }
template<typename T>
bool validate_read_and_copy_typed(T* dest, const T* src)
{
bool validated = validate_read_typed(src);
if (validated) {
copy_from_user(dest, src);
}
return validated;
}
template<typename T>
bool validate_write_typed(T* value, size_t count = 1) { return validate_write(value, sizeof(T) * count); }
template<typename DataType, typename SizeType>
bool validate(const Syscall::MutableBufferArgument<DataType, SizeType>&);