diff --git a/Userland/Libraries/LibAudio/Buffer.h b/Userland/Libraries/LibAudio/Buffer.h
index 82f5a6304b..dc4f4d4e7b 100644
--- a/Userland/Libraries/LibAudio/Buffer.h
+++ b/Userland/Libraries/LibAudio/Buffer.h
@@ -181,7 +181,7 @@ public:
 
 private:
     explicit Buffer(const Vector<Frame> samples)
-        : m_buffer(Core::AnonymousBuffer::create_with_size(samples.size() * sizeof(Frame)))
+        : m_buffer(Core::AnonymousBuffer::create_with_size(samples.size() * sizeof(Frame)).release_value())
         , m_id(allocate_id())
         , m_sample_count(samples.size())
     {
diff --git a/Userland/Libraries/LibCore/AnonymousBuffer.cpp b/Userland/Libraries/LibCore/AnonymousBuffer.cpp
index e019e365e5..daa89aa25a 100644
--- a/Userland/Libraries/LibCore/AnonymousBuffer.cpp
+++ b/Userland/Libraries/LibCore/AnonymousBuffer.cpp
@@ -4,10 +4,10 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Try.h>
 #include <LibCore/AnonymousBuffer.h>
 #include <LibIPC/File.h>
 #include <fcntl.h>
-#include <stdio.h>
 #include <sys/mman.h>
 
 #if defined(__serenity__)
@@ -26,40 +26,33 @@ static int memfd_create(const char* name, unsigned int flags)
 
 namespace Core {
 
-AnonymousBuffer AnonymousBuffer::create_with_size(size_t size)
+ErrorOr<AnonymousBuffer> AnonymousBuffer::create_with_size(size_t size)
 {
     int fd = -1;
 #if defined(__serenity__)
     fd = anon_create(round_up_to_power_of_two(size, PAGE_SIZE), O_CLOEXEC);
-    if (fd < 0) {
-        perror("anon_create");
-        return {};
-    }
+    if (fd < 0)
+        return AK::Error::from_errno(errno);
 #elif defined(__linux__)
     fd = memfd_create("", MFD_CLOEXEC);
-    if (fd < 0) {
-        perror("memfd_create");
-        return {};
-    }
+    if (fd < 0)
+        return Error::from_errno(errno);
     if (ftruncate(fd, size) < 0) {
         close(fd);
-        perror("ftruncate");
-        return {};
+        return Error::from_errno(errno);
     }
 #endif
     if (fd < 0)
-        return {};
+        return AK::Error::from_errno(errno);
     return create_from_anon_fd(fd, size);
 }
 
-RefPtr<AnonymousBufferImpl> AnonymousBufferImpl::create(int fd, size_t size)
+ErrorOr<NonnullRefPtr<AnonymousBufferImpl>> AnonymousBufferImpl::create(int fd, size_t size)
 {
     auto* data = mmap(nullptr, round_up_to_power_of_two(size, PAGE_SIZE), PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
-    if (data == MAP_FAILED) {
-        perror("mmap");
-        return {};
-    }
-    return adopt_ref(*new AnonymousBufferImpl(fd, size, data));
+    if (data == MAP_FAILED)
+        return AK::Error::from_errno(errno);
+    return AK::adopt_nonnull_ref_or_enomem(new (nothrow) AnonymousBufferImpl(fd, size, data));
 }
 
 AnonymousBufferImpl::~AnonymousBufferImpl()
@@ -72,12 +65,10 @@ AnonymousBufferImpl::~AnonymousBufferImpl()
     VERIFY(rc == 0);
 }
 
-AnonymousBuffer AnonymousBuffer::create_from_anon_fd(int fd, size_t size)
+ErrorOr<AnonymousBuffer> AnonymousBuffer::create_from_anon_fd(int fd, size_t size)
 {
-    auto impl = AnonymousBufferImpl::create(fd, size);
-    if (!impl)
-        return {};
-    return AnonymousBuffer(impl.release_nonnull());
+    auto impl = TRY(AnonymousBufferImpl::create(fd, size));
+    return AnonymousBuffer(move(impl));
 }
 
 AnonymousBuffer::AnonymousBuffer(NonnullRefPtr<AnonymousBufferImpl> impl)
diff --git a/Userland/Libraries/LibCore/AnonymousBuffer.h b/Userland/Libraries/LibCore/AnonymousBuffer.h
index ab4c2f9e07..5a0fd68dca 100644
--- a/Userland/Libraries/LibCore/AnonymousBuffer.h
+++ b/Userland/Libraries/LibCore/AnonymousBuffer.h
@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <AK/Error.h>
 #include <AK/Noncopyable.h>
 #include <AK/RefCounted.h>
 #include <AK/RefPtr.h>
@@ -16,7 +17,7 @@ namespace Core {
 
 class AnonymousBufferImpl final : public RefCounted<AnonymousBufferImpl> {
 public:
-    static RefPtr<AnonymousBufferImpl> create(int fd, size_t);
+    static ErrorOr<NonnullRefPtr<AnonymousBufferImpl>> create(int fd, size_t);
     ~AnonymousBufferImpl();
 
     int fd() const { return m_fd; }
@@ -34,8 +35,8 @@ private:
 
 class AnonymousBuffer {
 public:
-    static AnonymousBuffer create_with_size(size_t);
-    static AnonymousBuffer create_from_anon_fd(int fd, size_t);
+    static ErrorOr<AnonymousBuffer> create_with_size(size_t);
+    static ErrorOr<AnonymousBuffer> create_from_anon_fd(int fd, size_t);
 
     AnonymousBuffer() { }
 
diff --git a/Userland/Libraries/LibGUI/Clipboard.cpp b/Userland/Libraries/LibGUI/Clipboard.cpp
index 2fdc5b1e3b..09622a979e 100644
--- a/Userland/Libraries/LibGUI/Clipboard.cpp
+++ b/Userland/Libraries/LibGUI/Clipboard.cpp
@@ -106,11 +106,12 @@ RefPtr<Gfx::Bitmap> Clipboard::bitmap() const
 
 void Clipboard::set_data(ReadonlyBytes const& data, String const& type, HashMap<String, String> const& metadata)
 {
-    auto buffer = Core::AnonymousBuffer::create_with_size(data.size());
-    if (!buffer.is_valid()) {
+    auto buffer_or_error = Core::AnonymousBuffer::create_with_size(data.size());
+    if (buffer_or_error.is_error()) {
         dbgln("GUI::Clipboard::set_data() failed to create a buffer");
         return;
     }
+    auto buffer = buffer_or_error.release_value();
     if (!data.is_empty())
         memcpy(buffer.data<void>(), data.data(), data.size());
 
diff --git a/Userland/Libraries/LibGUI/Window.cpp b/Userland/Libraries/LibGUI/Window.cpp
index 67a5d0dd7b..67138b90ab 100644
--- a/Userland/Libraries/LibGUI/Window.cpp
+++ b/Userland/Libraries/LibGUI/Window.cpp
@@ -862,14 +862,14 @@ OwnPtr<WindowBackingStore> Window::create_backing_store(const Gfx::IntSize& size
     size_t pitch = Gfx::Bitmap::minimum_pitch(size.width(), format);
     size_t size_in_bytes = size.height() * pitch;
 
-    auto buffer = Core::AnonymousBuffer::create_with_size(round_up_to_power_of_two(size_in_bytes, PAGE_SIZE));
-    if (!buffer.is_valid()) {
+    auto buffer_or_error = Core::AnonymousBuffer::create_with_size(round_up_to_power_of_two(size_in_bytes, PAGE_SIZE));
+    if (buffer_or_error.is_error()) {
         perror("anon_create");
         return {};
     }
 
     // FIXME: Plumb scale factor here eventually.
-    auto bitmap = Gfx::Bitmap::try_create_with_anonymous_buffer(format, move(buffer), size, 1, {});
+    auto bitmap = Gfx::Bitmap::try_create_with_anonymous_buffer(format, buffer_or_error.release_value(), size, 1, {});
     if (!bitmap) {
         VERIFY(size.width() <= INT16_MAX);
         VERIFY(size.height() <= INT16_MAX);
diff --git a/Userland/Libraries/LibGfx/Bitmap.cpp b/Userland/Libraries/LibGfx/Bitmap.cpp
index 588bf36d19..fd0489c039 100644
--- a/Userland/Libraries/LibGfx/Bitmap.cpp
+++ b/Userland/Libraries/LibGfx/Bitmap.cpp
@@ -81,10 +81,10 @@ RefPtr<Bitmap> Bitmap::try_create_shareable(BitmapFormat format, const IntSize&
     const auto pitch = minimum_pitch(size.width() * scale_factor, format);
     const auto data_size = size_in_bytes(pitch, size.height() * scale_factor);
 
-    auto buffer = Core::AnonymousBuffer::create_with_size(round_up_to_power_of_two(data_size, PAGE_SIZE));
-    if (!buffer.is_valid())
+    auto buffer_or_error = Core::AnonymousBuffer::create_with_size(round_up_to_power_of_two(data_size, PAGE_SIZE));
+    if (buffer_or_error.is_error())
         return nullptr;
-    return Bitmap::try_create_with_anonymous_buffer(format, buffer, size, scale_factor, {});
+    return Bitmap::try_create_with_anonymous_buffer(format, buffer_or_error.release_value(), size, scale_factor, {});
 }
 
 Bitmap::Bitmap(BitmapFormat format, const IntSize& size, int scale_factor, const BackingStore& backing_store)
@@ -525,10 +525,10 @@ RefPtr<Bitmap> Bitmap::to_bitmap_backed_by_anonymous_buffer() const
 {
     if (m_buffer.is_valid())
         return *this;
-    auto buffer = Core::AnonymousBuffer::create_with_size(round_up_to_power_of_two(size_in_bytes(), PAGE_SIZE));
-    if (!buffer.is_valid())
+    auto buffer_or_error = Core::AnonymousBuffer::create_with_size(round_up_to_power_of_two(size_in_bytes(), PAGE_SIZE));
+    if (buffer_or_error.is_error())
         return nullptr;
-    auto bitmap = Bitmap::try_create_with_anonymous_buffer(m_format, move(buffer), size(), scale(), palette_to_vector());
+    auto bitmap = Bitmap::try_create_with_anonymous_buffer(m_format, buffer_or_error.release_value(), size(), scale(), palette_to_vector());
     if (!bitmap)
         return nullptr;
     memcpy(bitmap->scanline(0), scanline(0), size_in_bytes());
diff --git a/Userland/Libraries/LibGfx/Palette.cpp b/Userland/Libraries/LibGfx/Palette.cpp
index 37fde562c9..c8e5e24675 100644
--- a/Userland/Libraries/LibGfx/Palette.cpp
+++ b/Userland/Libraries/LibGfx/Palette.cpp
@@ -44,7 +44,7 @@ String PaletteImpl::path(PathRole role) const
 
 NonnullRefPtr<PaletteImpl> PaletteImpl::clone() const
 {
-    auto new_theme_buffer = Core::AnonymousBuffer::create_with_size(m_theme_buffer.size());
+    auto new_theme_buffer = Core::AnonymousBuffer::create_with_size(m_theme_buffer.size()).release_value();
     memcpy(new_theme_buffer.data<SystemTheme>(), &theme(), m_theme_buffer.size());
     return adopt_ref(*new PaletteImpl(move(new_theme_buffer)));
 }
diff --git a/Userland/Libraries/LibGfx/ShareableBitmap.cpp b/Userland/Libraries/LibGfx/ShareableBitmap.cpp
index b1b789b64b..35358227a7 100644
--- a/Userland/Libraries/LibGfx/ShareableBitmap.cpp
+++ b/Userland/Libraries/LibGfx/ShareableBitmap.cpp
@@ -73,10 +73,10 @@ bool decode(Decoder& decoder, Gfx::ShareableBitmap& shareable_bitmap)
         if (!decoder.decode(palette))
             return false;
     }
-    auto buffer = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), Gfx::Bitmap::size_in_bytes(Gfx::Bitmap::minimum_pitch(size.width(), bitmap_format), size.height()));
-    if (!buffer.is_valid())
+    auto buffer_or_error = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), Gfx::Bitmap::size_in_bytes(Gfx::Bitmap::minimum_pitch(size.width(), bitmap_format), size.height()));
+    if (buffer_or_error.is_error())
         return false;
-    auto bitmap = Gfx::Bitmap::try_create_with_anonymous_buffer(bitmap_format, buffer, size, scale, palette);
+    auto bitmap = Gfx::Bitmap::try_create_with_anonymous_buffer(bitmap_format, buffer_or_error.release_value(), size, scale, palette);
     if (!bitmap)
         return false;
     shareable_bitmap = Gfx::ShareableBitmap { bitmap.release_nonnull(), Gfx::ShareableBitmap::ConstructWithKnownGoodBitmap };
diff --git a/Userland/Libraries/LibGfx/SystemTheme.cpp b/Userland/Libraries/LibGfx/SystemTheme.cpp
index d1c7db8018..88e841c2de 100644
--- a/Userland/Libraries/LibGfx/SystemTheme.cpp
+++ b/Userland/Libraries/LibGfx/SystemTheme.cpp
@@ -29,7 +29,7 @@ void set_system_theme(Core::AnonymousBuffer buffer)
 
 Core::AnonymousBuffer load_system_theme(Core::ConfigFile const& file)
 {
-    auto buffer = Core::AnonymousBuffer::create_with_size(sizeof(SystemTheme));
+    auto buffer = Core::AnonymousBuffer::create_with_size(sizeof(SystemTheme)).release_value();
 
     auto* data = buffer.data<SystemTheme>();
 
diff --git a/Userland/Libraries/LibIPC/Decoder.cpp b/Userland/Libraries/LibIPC/Decoder.cpp
index 4a2093b78c..248a69cbb4 100644
--- a/Userland/Libraries/LibIPC/Decoder.cpp
+++ b/Userland/Libraries/LibIPC/Decoder.cpp
@@ -193,7 +193,10 @@ bool decode(Decoder& decoder, Core::AnonymousBuffer& buffer)
     if (!decoder.decode(anon_file))
         return false;
 
-    buffer = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), size);
+    auto new_buffer_or_error = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), size);
+    if (new_buffer_or_error.is_error())
+        return false;
+    buffer = new_buffer_or_error.release_value();
     return buffer.is_valid();
 }
 
diff --git a/Userland/Libraries/LibImageDecoderClient/Client.cpp b/Userland/Libraries/LibImageDecoderClient/Client.cpp
index 97010935f2..1c7d845637 100644
--- a/Userland/Libraries/LibImageDecoderClient/Client.cpp
+++ b/Userland/Libraries/LibImageDecoderClient/Client.cpp
@@ -25,11 +25,12 @@ Optional<DecodedImage> Client::decode_image(const ReadonlyBytes& encoded_data)
     if (encoded_data.is_empty())
         return {};
 
-    auto encoded_buffer = Core::AnonymousBuffer::create_with_size(encoded_data.size());
-    if (!encoded_buffer.is_valid()) {
+    auto encoded_buffer_or_error = Core::AnonymousBuffer::create_with_size(encoded_data.size());
+    if (encoded_buffer_or_error.is_error()) {
         dbgln("Could not allocate encoded buffer");
         return {};
     }
+    auto encoded_buffer = encoded_buffer_or_error.release_value();
 
     memcpy(encoded_buffer.data<void>(), encoded_data.data(), encoded_data.size());
     auto response_or_error = try_decode_image(move(encoded_buffer));
diff --git a/Userland/Services/SpiceAgent/ClipboardServerConnection.cpp b/Userland/Services/SpiceAgent/ClipboardServerConnection.cpp
index 18a34729e6..94feabecae 100644
--- a/Userland/Services/SpiceAgent/ClipboardServerConnection.cpp
+++ b/Userland/Services/SpiceAgent/ClipboardServerConnection.cpp
@@ -62,7 +62,9 @@ void ClipboardServerConnection::set_bitmap(Gfx::Bitmap const& bitmap)
     metadata.set("format", String::number((int)bitmap.format()));
     metadata.set("pitch", String::number(bitmap.pitch()));
     ReadonlyBytes data { bitmap.scanline(0), bitmap.size_in_bytes() };
-    auto buffer = Core::AnonymousBuffer::create_with_size(bitmap.size_in_bytes());
+    auto buffer_or_error = Core::AnonymousBuffer::create_with_size(bitmap.size_in_bytes());
+    VERIFY(!buffer_or_error.is_error());
+    auto buffer = buffer_or_error.release_value();
     memcpy(buffer.data<u8>(), data.data(), data.size());
     this->async_set_clipboard_data(buffer, "image/x-serenityos", metadata);
 }
diff --git a/Userland/Services/SpiceAgent/SpiceAgent.cpp b/Userland/Services/SpiceAgent/SpiceAgent.cpp
index 5941c975f6..0e99e0447f 100644
--- a/Userland/Services/SpiceAgent/SpiceAgent.cpp
+++ b/Userland/Services/SpiceAgent/SpiceAgent.cpp
@@ -133,7 +133,9 @@ void SpiceAgent::on_message_received()
 
         m_just_set_clip = true;
         if (type == ClipboardType::Text) {
-            auto anon_buffer = Core::AnonymousBuffer::create_with_size(data_buffer.size());
+            auto anon_buffer_or_error = Core::AnonymousBuffer::create_with_size(data_buffer.size());
+            VERIFY(!anon_buffer_or_error.is_error());
+            auto anon_buffer = anon_buffer_or_error.release_value();
             memcpy(anon_buffer.data<void>(), data_buffer.data(), data_buffer.size());
             m_clipboard_connection.async_set_clipboard_data(anon_buffer, "text/plain", {});
             return;
diff --git a/Userland/Services/WebContent/PageHost.cpp b/Userland/Services/WebContent/PageHost.cpp
index 69ccb31151..07036ac4a3 100644
--- a/Userland/Services/WebContent/PageHost.cpp
+++ b/Userland/Services/WebContent/PageHost.cpp
@@ -34,7 +34,9 @@ PageHost::~PageHost()
 void PageHost::setup_palette()
 {
     // FIXME: Get the proper palette from our peer somehow
-    auto buffer = Core::AnonymousBuffer::create_with_size(sizeof(Gfx::SystemTheme));
+    auto buffer_or_error = Core::AnonymousBuffer::create_with_size(sizeof(Gfx::SystemTheme));
+    VERIFY(!buffer_or_error.is_error());
+    auto buffer = buffer_or_error.release_value();
     auto* theme = buffer.data<Gfx::SystemTheme>();
     theme->color[(int)Gfx::ColorRole::Window] = Color::Magenta;
     theme->color[(int)Gfx::ColorRole::WindowText] = Color::Cyan;
diff --git a/Userland/Services/WindowServer/ClientConnection.cpp b/Userland/Services/WindowServer/ClientConnection.cpp
index 5599c86b4c..74d902a723 100644
--- a/Userland/Services/WindowServer/ClientConnection.cpp
+++ b/Userland/Services/WindowServer/ClientConnection.cpp
@@ -635,14 +635,14 @@ void ClientConnection::set_window_backing_store(i32 window_id, [[maybe_unused]]
         window.swap_backing_stores();
     } else {
         // FIXME: Plumb scale factor here eventually.
-        Core::AnonymousBuffer buffer = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), pitch * size.height());
-        if (!buffer.is_valid()) {
+        auto buffer_or_error = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), pitch * size.height());
+        if (buffer_or_error.is_error()) {
             did_misbehave("SetWindowBackingStore: Failed to create anonymous buffer for window backing store");
             return;
         }
         auto backing_store = Gfx::Bitmap::try_create_with_anonymous_buffer(
             has_alpha_channel ? Gfx::BitmapFormat::BGRA8888 : Gfx::BitmapFormat::BGRx8888,
-            move(buffer),
+            buffer_or_error.release_value(),
             size,
             1,
             {});