Add opt-in Linux renderer sandbox support to WebContent and WebWorker.
Ladybird and test-web pass --enable-sandbox through when requested, and
the renderer services only install the shared sandbox when that flag is
present.
Share one renderer policy for both services. Allow resource, font,
shared library, WebGL, Wasm, audio, and local IPC paths needed at
runtime, while keeping renderer filesystem writes mediated by Landlock.
Allow Mesa and PulseAudio to probe their standard runtime state without
escaping the renderer sandbox. Return EPERM for scheduler and priority
changes so library initialization can fall back instead of crashing on a
seccomp violation.
Add opt-in Linux sandbox support to RequestServer. Ladybird and test-web
pass --enable-sandbox through when requested, and RequestServer only
installs the sandbox when that flag is present.
Allow reads for resolver and TLS configuration, plus the configured
certificate locations. Create and allow writes to the Ladybird cache
root, so libcurl alt-svc files and HTTP disk-cache files stay inside the
single writable tree. Also allow the systemd-resolved runtime directory
when present, since /etc/resolv.conf can point there.
Extend LibSandbox with owned Landlock paths, an add-if-exists helper,
read/write Landlock access, and reusable seccomp groups for filesystem
writes and network syscalls. Include POSIX file locks and socket byte
count ioctls needed by libc resolver and cache paths. Reuse the new
Landlock helper from Compositor as well, and allow its Mesa shader cache
directory so GPU startup can populate shader cache files after
sandboxing.
Compositor still needs to decode font resources from display-list IPC
after startup. Let its sandbox grant read-only access to configured font
directories and bundled resource fonts through Landlock, and allow
read-only open plus metadata syscalls in the seccomp policy.
Preload the same font directories before installing the sandbox so the
Compositor can handle display lists that reference system-backed fonts.
The full test-web suite completes without Compositor sandbox crashes.
Add opt-in Linux sandbox support to Compositor. Ladybird and test-web
pass --enable-sandbox through when requested, and Compositor only
installs the sandbox when that flag is present.
Install the sandbox after Compositor has initialized platform, font, and
GPU state so startup probing can complete before filesystem access is
removed. Compose the runtime seccomp policy from LibSandbox building
blocks and add an explicit GPU device operations group for driver IPC
through already-open descriptors.
Move the Linux no_new_privs, Landlock, and seccomp policy plumbing
into LibSandbox so individual services can describe the privileges they
need without copying the BPF and kernel feature detection machinery.
Keep ImageDecoder's sandbox policy service-local by composing the new
building blocks in SandboxLinux.cpp. This preserves the existing syscall
allowlist while making the policy easier to audit and reuse.
