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feat(sandbox) explicitly drop support of quotas on LuaJIT

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The solution we use in PUC Rio Lua (with debug.sethook) simply does not
work in LuaJIT.

* We have added a `sandbox.quota_supported` field to signal this feature
  (or lack of thereof)
* We explicitly return an error if `options.quota` is passed on a LuaJIT
  environment, in order to prevent LuaJIT users from believing that they
  are protected against infinite loops.
This commit is contained in:
Enrique García Cota
2021-01-05 00:43:04 +01:00
parent 242a749c4d
commit 71223d4fe9
3 changed files with 34 additions and 21 deletions
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40
spec/sandbox_spec.lua
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@@ -84,27 +84,31 @@ describe('sandbox.run', function()
end)
describe('when given infinite loops', function()
if sandbox.quota_supported then
describe('when given infinite loops', function()
it('throws an error with infinite loops', function()
assert.error(function() sandbox.run("while true do end") end)
end)
it('throws an error with infinite loops', function()
assert.error(function() sandbox.run("while true do end") end)
it('restores string.rep even after a while true', function()
assert.error(function() sandbox.run("while true do end") end)
assert.equal('hellohello', string.rep('hello', 2))
end)
it('accepts a quota param', function()
assert.has_no.errors(function() sandbox.run("for i=1,100 do end") end)
assert.error(function() sandbox.run("for i=1,100 do end", {quota = 20}) end)
end)
it('does not use quotes if the quote param is false', function()
assert.has_no.errors(function() sandbox.run("for i=1,1000000 do end", {quota = false}) end)
end)
end)
it('restores string.rep even after a while true', function()
assert.error(function() sandbox.run("while true do end") end)
assert.equal('hellohello', string.rep('hello', 2))
else
it('throws an error when trying to use the quota option in an unsupported environment (LuaJIT)', function()
assert.error(function() sandbox.run("", {quota = 20}) end)
end)
it('accepts a quota param', function()
assert.has_no.errors(function() sandbox.run("for i=1,100 do end") end)
assert.error(function() sandbox.run("for i=1,100 do end", {quota = 20}) end)
end)
it('does not use quotes if the quote param is false', function()
assert.has_no.errors(function() sandbox.run("for i=1,1000000 do end", {quota = false}) end)
end)
end)
end
describe('when given an env option', function()