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Kernel: Prevent using copy_from_user() for timespec/timeval

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These structs can be inconsistent, for example if the amount of microseconds is
negative or larger than 1'000'000. Therefore, they should not be copied as-is.
Use copy_time_from_user instead.
This commit is contained in:
Ben Wiederhake 2021-02-13 11:33:28 +01:00 committed by Andreas Kling
parent 8598240193
commit e510c41fd2
2 changed files with 22 additions and 0 deletions
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2
AK/Forward.h
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@ -43,6 +43,7 @@ class String;
class StringBuilder;
class StringImpl;
class StringView;
class Time;
class URL;
class FlyString;
class Utf32View;
@ -175,6 +176,7 @@ using AK::String;
using AK::StringBuilder;
using AK::StringImpl;
using AK::StringView;
using AK::Time;
using AK::Traits;
using AK::URL;
using AK::Utf32View;

20
Kernel/StdLib.h
View file

@ -102,6 +102,26 @@ template<typename T>
return copy_from_user(dest, src.unsafe_userspace_ptr(), sizeof(T));
}
#define DEPRECATE_COPY_FROM_USER_TYPE(T, REPLACEMENT) \
template<> \
[[nodiscard]] inline __attribute__((deprecated("use " #REPLACEMENT " instead"))) bool copy_from_user<T>(T*, const T*) \
{ \
VERIFY_NOT_REACHED(); \
} \
template<> \
[[nodiscard]] inline __attribute__((deprecated("use " #REPLACEMENT " instead"))) bool copy_from_user<T>(T*, Userspace<const T*>) \
{ \
VERIFY_NOT_REACHED(); \
} \
template<> \
[[nodiscard]] inline __attribute__((deprecated("use " #REPLACEMENT " instead"))) bool copy_from_user<T>(T*, Userspace<T*>) \
{ \
VERIFY_NOT_REACHED(); \
}
DEPRECATE_COPY_FROM_USER_TYPE(timespec, copy_time_from_user)
DEPRECATE_COPY_FROM_USER_TYPE(timeval, copy_time_from_user)
template<typename T>
[[nodiscard]] inline bool copy_to_user(Userspace<T*> dest, const T* src)
{