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fix(browser): inject --no-sandbox for root and AppArmor userns restrictions #19747

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Merged
teknium1 merged 1 commit into from
May 4, 2026
Merged

fix(browser): inject --no-sandbox for root and AppArmor userns restrictions #19747

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28 changes: 28 additions & 0 deletions tools/browser_tool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1482,6 +1482,34 @@ def _run_browser_command(
if "AGENT_BROWSER_IDLE_TIMEOUT_MS" not in browser_env:
idle_ms = str(BROWSER_SESSION_INACTIVITY_TIMEOUT * 1000)
browser_env["AGENT_BROWSER_IDLE_TIMEOUT_MS"] = idle_ms

# Inject --no-sandbox when needed (issue #15765):
# - Running as root: Chromium always refuses to start without it
# - Ubuntu 23.10+ / AppArmor systems: unprivileged user namespaces
# are restricted, causing Chromium to exit with "No usable sandbox"
# even for non-root users running under systemd or containers.
if "AGENT_BROWSER_CHROME_FLAGS" not in browser_env:
_needs_sandbox_bypass = False
if hasattr(os, "geteuid") and os.geteuid() == 0:
_needs_sandbox_bypass = True
logger.debug("browser: running as root — injecting --no-sandbox")
else:
# Detect AppArmor user namespace restrictions (Ubuntu 23.10+)
_userns_restrict = "/proc/sys/kernel/apparmor_restrict_unprivileged_userns"
try:
with open(_userns_restrict) as _f:
if _f.read().strip() == "1":
_needs_sandbox_bypass = True
logger.debug(
"browser: AppArmor userns restrictions detected — "
"injecting --no-sandbox"
)
except OSError:
pass
if _needs_sandbox_bypass:
browser_env["AGENT_BROWSER_CHROME_FLAGS"] = (
"--no-sandbox --disable-dev-shm-usage"
)

# Use temp files for stdout/stderr instead of pipes.
# agent-browser starts a background daemon that inherits file
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