steam-frame/saphid--chromium-webxr-steam-frame
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Chromium with WebXR for the Steam Frame

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Build script, SteamVR sandbox patch, and a Frame installer that adds
Chromium XR to the Steam library.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
saphidandClaude Opus 5.5 committed 2026-09-26 23:13:40 +10:00
commit 60237408b3
11 files changed
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patches/0001-xr-sandbox-allow-getsockopt-SO_PEERCRED.patch
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diff --git a/sandbox/policy/linux/bpf_xr_policy_linux.cc b/sandbox/policy/linux/bpf_xr_policy_linux.cc
index 435e13d396..297453f582 100644
--- a/sandbox/policy/linux/bpf_xr_policy_linux.cc
+++ b/sandbox/policy/linux/bpf_xr_policy_linux.cc
@@ -11,6 +11,7 @@
#include "sandbox/linux/system_headers/linux_syscalls.h"
#include "sandbox/policy/linux/sandbox_linux.h"
+using sandbox::bpf_dsl::AllOf;
using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::Arg;
using sandbox::bpf_dsl::Error;
@@ -27,8 +28,8 @@ XrProcessPolicy::~XrProcessPolicy() = default;
ResultExpr XrProcessPolicy::EvaluateSyscall(int system_call_number) const {
switch (system_call_number) {
// The runtime reaches its compositor over an AF_UNIX socket and passes fds
- // with SCM_RIGHTS, neither of which the GPU policy allows. get/setsockopt
- // stay disallowed; add a narrow level/optname restriction if ever needed.
+ // with SCM_RIGHTS, neither of which the GPU policy allows. setsockopt
+ // stays disallowed; getsockopt is limited to SO_PEERCRED below.
#if defined(__NR_getpeername)
case __NR_getpeername:
#endif
@@ -49,6 +50,16 @@ ResultExpr XrProcessPolicy::EvaluateSyscall(int system_call_number) const {
case __NR_get_robust_list:
#endif
return Allow();
+#if defined(__NR_getsockopt)
+ case __NR_getsockopt: {
+ // SteamVR's IPC client checks who is on the other end of its socket
+ // with SO_PEERCRED. Nothing else is readable.
+ const Arg<int> level(1);
+ const Arg<int> optname(2);
+ return If(AllOf(level == SOL_SOCKET, optname == SO_PEERCRED), Allow())
+ .Else(Error(EPERM));
+ }
+#endif
#if defined(__NR_kill)
case __NR_kill: {
// SteamVR probes its sibling processes for liveness with kill(pid, 0).
patches/README.md
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# Patches
Local changes applied on top of Chromium
[CL 8132979](https://chromium-review.googlesource.com/c/chromium/src/+/8132979)
and [CL 8441736](https://chromium-review.googlesource.com/c/chromium/src/+/8441736)
by `build/build.sh`, in file-name order.
- `0001-xr-sandbox-allow-getsockopt-SO_PEERCRED.patch`: lets the XR process
call `getsockopt(SOL_SOCKET, SO_PEERCRED)`, which SteamVR's OpenXR runtime
needs. See [docs/technical-notes.md](../docs/technical-notes.md).
These patches modify Chromium source and are under
[Chromium's BSD-style license](https://chromium.googlesource.com/chromium/src/+/main/LICENSE),
Copyright The Chromium Authors.