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Kernel: Implement 'copy_time_from_user' functions to sanitize arguments

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This commit is contained in:
Ben Wiederhake 2021-02-21 19:18:55 +01:00 • committed by Andreas Kling
commit 649abc01bc
Notes: sideshowbarker 2024-07-18 21:48:14 +09:00
2 changed files with 32 additions and 0 deletions
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26
Kernel/StdLib.cpp
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@ -63,6 +63,32 @@ String copy_string_from_user(Userspace<const char*> user_str, size_t user_str_si
return copy_string_from_user(user_str.unsafe_userspace_ptr(), user_str_size);
}
[[nodiscard]] Optional<Time> copy_time_from_user(const timespec* ts_user)
{
timespec ts;
if (!copy_from_user(&ts, ts_user, sizeof(timespec))) {
return {};
}
return Time::from_timespec(ts);
}
[[nodiscard]] Optional<Time> copy_time_from_user(const timeval* tv_user)
{
timeval tv;
if (!copy_from_user(&tv, tv_user, sizeof(timeval))) {
return {};
}
return Time::from_timeval(tv);
}
template<>
[[nodiscard]] Optional<Time> copy_time_from_user<const timeval>(Userspace<const timeval*> src) { return copy_time_from_user(src.unsafe_userspace_ptr()); }
template<>
[[nodiscard]] Optional<Time> copy_time_from_user<timeval>(Userspace<timeval*> src) { return copy_time_from_user(src.unsafe_userspace_ptr()); }
template<>
[[nodiscard]] Optional<Time> copy_time_from_user<const timespec>(Userspace<const timespec*> src) { return copy_time_from_user(src.unsafe_userspace_ptr()); }
template<>
[[nodiscard]] Optional<Time> copy_time_from_user<timespec>(Userspace<timespec*> src) { return copy_time_from_user(src.unsafe_userspace_ptr()); }
Optional<u32> user_atomic_fetch_add_relaxed(volatile u32* var, u32 val)
{
if (FlatPtr(var) & 3)