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AK: Disallow returning of string literals for errors in kernel code

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This code should not be used in the kernel - we should always propagate
proper errno codes in case we need to return those to userland so it
could decode it in a reasonable way.
This commit is contained in:
Liav A 2023-02-04 14:18:36 +02:00 • committed by Linus Groh
parent 56b799c556
commit 048fb2c204
5 changed files with 51 additions and 20 deletions
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33
AK/Error.h
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@ -31,7 +31,12 @@ public:
// For calling this method from userspace programs, we will simply return from
// the Error::from_string_view method!
[[nodiscard]] static Error from_string_view_or_print_error_and_return_errno(StringView string_literal, int code);
[[nodiscard]] static Error from_syscall(StringView syscall_name, int rc) { return Error(syscall_name, rc); }
#ifndef KERNEL
[[nodiscard]] static Error from_syscall(StringView syscall_name, int rc)
{
return Error(syscall_name, rc);
}
[[nodiscard]] static Error from_string_view(StringView string_literal) { return Error(string_literal); }
[[nodiscard]] static Error copy(Error const& error)
@ -57,17 +62,29 @@ public:
{
return from_string_view(string);
}
#endif
bool operator==(Error const& other) const
{
#ifdef KERNEL
return m_code == other.m_code;
#else
return m_code == other.m_code && m_string_literal == other.m_string_literal && m_syscall == other.m_syscall;
#endif
}
bool is_errno() const { return m_code != 0; }
bool is_syscall() const { return m_syscall; }
int code() const { return m_code; }
StringView string_literal() const { return m_string_literal; }
#ifndef KERNEL
bool is_errno() const
{
return m_code != 0;
}
bool is_syscall() const { return m_syscall; }
StringView string_literal() const
{
return m_string_literal;
}
#endif
protected:
Error(int code)
@ -76,6 +93,7 @@ protected:
}
private:
#ifndef KERNEL
Error(StringView string_literal)
: m_string_literal(string_literal)
{
@ -92,8 +110,13 @@ private:
Error& operator=(Error const&) = default;
StringView m_string_literal;
#endif
int m_code { 0 };
#ifndef KERNEL
bool m_syscall { false };
#endif
};
template<typename T, typename E>