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vim-patch:7.4.1777

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Problem:    Newly added features can escape the sandbox.
Solution:   Add checks for restricted and secure. (Yasuhiro Matsumoto)
3849992b16

timer_start is missing check_secure.

The timer callback can, for example, call a function defined from outside the sandbox that does
stuff that would be disallowed from inside the sandbox. This is usually not allowed.

Cherry-pick eval.txt change from:
68e6560b84

Required for v8.1.2013.
This commit is contained in:
Sean Dewar 2021-11-01 16:21:16 +00:00
parent 39776d1a65
commit 38a831e54a
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GPG Key ID: 08CC2C83AD41B581
3 changed files with 15 additions and 0 deletions
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2
runtime/doc/eval.txt
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@ -10171,6 +10171,8 @@ timer_start({time}, {callback} [, {options}])
\ {'repeat': 3}) \ {'repeat': 3})
< This invokes MyHandler() three times at 500 msec intervals. < This invokes MyHandler() three times at 500 msec intervals.
Not available in the |sandbox|.
timer_stop({timer}) *timer_stop()* timer_stop({timer}) *timer_stop()*
Stop a timer. The timer callback will no longer be invoked. Stop a timer. The timer callback will no longer be invoked.
{timer} is an ID returned by timer_start(), thus it must be a {timer} is an ID returned by timer_start(), thus it must be a

3
src/nvim/eval/funcs.c
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@ -11551,6 +11551,9 @@ static void f_timer_start(typval_T *argvars, typval_T *rettv, FunPtr fptr)
dict_T *dict; dict_T *dict;
rettv->vval.v_number = -1; rettv->vval.v_number = -1;
if (check_secure()) {
return;
}
if (argvars[2].v_type != VAR_UNKNOWN) { if (argvars[2].v_type != VAR_UNKNOWN) {
if (argvars[2].v_type != VAR_DICT if (argvars[2].v_type != VAR_DICT

10
test/functional/vimscript/timer_spec.lua
View File

@ -3,6 +3,7 @@ local Screen = require('test.functional.ui.screen')
local feed, eq, eval, ok = helpers.feed, helpers.eq, helpers.eval, helpers.ok local feed, eq, eval, ok = helpers.feed, helpers.eq, helpers.eval, helpers.ok
local source, nvim_async, run = helpers.source, helpers.nvim_async, helpers.run local source, nvim_async, run = helpers.source, helpers.nvim_async, helpers.run
local clear, command, funcs = helpers.clear, helpers.command, helpers.funcs local clear, command, funcs = helpers.clear, helpers.command, helpers.funcs
local exc_exec = helpers.exc_exec
local curbufmeths = helpers.curbufmeths local curbufmeths = helpers.curbufmeths
local load_adjust = helpers.load_adjust local load_adjust = helpers.load_adjust
local retry = helpers.retry local retry = helpers.retry
@ -262,4 +263,13 @@ describe('timers', function()
eq(2, eval('g:val')) eq(2, eval('g:val'))
end) end)
it("timer_start can't be used in the sandbox", function()
source [[
function! Scary(timer) abort
call execute('echo ''execute() should be disallowed''', '')
endfunction
]]
eq("Vim(call):E48: Not allowed in sandbox", exc_exec("sandbox call timer_start(0, 'Scary')"))
end)
end) end)