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fix(terminal): patch various autocommand-related holes

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Problem: autocommands can cause various problems in terminal mode, which can
lead to crashes, for example.

Solution: fix found issues. Move some checks to terminal_check and guard against
autocommands messing with things. Trigger TermEnter/Leave after terminal mode
has changed/restored most state. Wipeout the correct buffer if TermLeave
switches buffers and fix a UAF if it or WinScrolled/Resized frees the terminal
prematurely.

These changes also allow us to remove the buffer restrictions on TextChangedT;
they were inadequate in stopping some issues, and WinScrolled/Resized was
lacking them anyway.
This commit is contained in:
Sean Dewar
2025-03-03 20:43:07 +00:00
committed by zeertzjq
parent 2eea65fe68
commit 46d68e5290
4 changed files with 193 additions and 67 deletions
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68
test/functional/autocmd/termxx_spec.lua
View File

@@ -5,6 +5,7 @@ local uv = vim.uv
local clear, command, testprg = n.clear, n.command, n.testprg
local eval, eq, neq, retry = n.eval, t.eq, t.neq, t.retry
local exec_lua = n.exec_lua
local matches = t.matches
local ok = t.ok
local feed = n.feed
@@ -197,30 +198,63 @@ it('autocmd TermEnter, TermLeave', function()
}, eval('g:evs'))
end)
describe('autocmd TextChangedT', function()
local screen
before_each(function()
clear()
screen = tt.setup_screen()
end)
describe('autocmd TextChangedT,WinResized', function()
before_each(clear)
it('works', function()
it('TextChangedT works', function()
command('autocmd TextChangedT * ++once let g:called = 1')
tt.setup_screen()
tt.feed_data('a')
retry(nil, nil, function()
eq(1, api.nvim_get_var('called'))
end)
end)
it('cannot delete terminal buffer', function()
command('autocmd TextChangedT * bwipe!')
tt.feed_data('a')
screen:expect({ any = 'E937: ' })
feed('<CR>')
command('autocmd! TextChangedT')
matches(
'^E937: Attempt to delete a buffer that is in use: term://',
api.nvim_get_vvar('errmsg')
)
it('no crash when deleting terminal buffer', function()
-- Using nvim_open_term over :terminal as the former can free the terminal immediately on
-- close, causing the crash.
-- WinResized
local buf1, term1 = exec_lua(function()
vim.cmd.new()
local buf = vim.api.nvim_get_current_buf()
local term = vim.api.nvim_open_term(0, {
on_input = function()
vim.cmd.wincmd '_'
end,
})
vim.api.nvim_create_autocmd('WinResized', {
once = true,
command = 'bwipeout!',
})
return buf, term
end)
feed('ii')
eq(false, api.nvim_buf_is_valid(buf1))
eq('n', eval('mode()'))
eq({}, api.nvim_get_chan_info(term1)) -- Channel should've been cleaned up.
-- TextChangedT
local buf2, term2 = exec_lua(function()
vim.cmd.new()
local buf = vim.api.nvim_get_current_buf()
local term = vim.api.nvim_open_term(0, {
on_input = function(_, chan)
vim.api.nvim_chan_send(chan, 'sup')
end,
})
vim.api.nvim_create_autocmd('TextChangedT', {
once = true,
command = 'bwipeout!',
})
return buf, term
end)
feed('ii')
-- refresh_terminal is deferred, so TextChangedT may not trigger immediately.
retry(nil, nil, function()
eq(false, api.nvim_buf_is_valid(buf2))
end)
eq('n', eval('mode()'))
eq({}, api.nvim_get_chan_info(term2)) -- Channel should've been cleaned up.
end)
end)

73
test/functional/terminal/buffer_spec.lua
View File

@@ -351,12 +351,15 @@ describe(':terminal buffer', function()
local chan = vim.api.nvim_open_term(0, {
on_input = function(_, term, buf, data)
if data == '\27[I' then
vim.b[buf].term_focused = true
vim.api.nvim_chan_send(term, 'focused\n')
elseif data == '\27[O' then
vim.b[buf].term_focused = false
vim.api.nvim_chan_send(term, 'unfocused\n')
end
end,
})
vim.b.term_focused = false
vim.api.nvim_chan_send(chan, '\27[?1004h') -- Enable focus reporting
end
@@ -373,6 +376,21 @@ describe(':terminal buffer', function()
|
]])
-- TermEnter/Leave happens *after* entering/leaving terminal mode, so focus should've changed
-- already by the time these events run.
exec_lua(function()
_G.last_event = nil
vim.api.nvim_create_autocmd({ 'TermEnter', 'TermLeave' }, {
callback = function(args)
_G.last_event = args.event
.. ' '
.. vim.fs.basename(args.file)
.. ' '
.. tostring(vim.b[args.buf].term_focused)
end,
})
end)
feed('i')
screen:expect([[
focused │focused │ |
@@ -381,6 +399,8 @@ describe(':terminal buffer', function()
{17:foo }{18:foo bar }|
{3:-- TERMINAL --} |
]])
eq('TermEnter foo true', exec_lua('return _G.last_event'))
-- Next window has the same terminal; no new notifications.
command('wincmd w')
screen:expect([[
@@ -409,6 +429,7 @@ describe(':terminal buffer', function()
{18:foo foo }{17:bar }|
|
]])
eq('TermLeave bar false', exec_lua('return _G.last_event'))
end)
end)
@@ -751,6 +772,58 @@ describe(':terminal buffer', function()
unchanged = true,
})
end)
it('does not wipeout unrelated buffer after channel closes', function()
local screen = Screen.new(50, 7)
screen:set_default_attr_ids({
[1] = { foreground = Screen.colors.Blue1, bold = true },
[2] = { reverse = true },
[31] = { background = Screen.colors.DarkGreen, foreground = Screen.colors.White, bold = true },
})
local old_buf = api.nvim_get_current_buf()
command('new')
fn.chanclose(api.nvim_open_term(0, {}))
local term_buf = api.nvim_get_current_buf()
screen:expect([[
^ |
[Terminal closed] |
{31:[Scratch] }|
|
{1:~ }|
{2:[No Name] }|
|
]])
-- Autocommand should not result in the wrong buffer being wiped out.
command('autocmd TermLeave * ++once wincmd p')
feed('ii')
screen:expect([[
^ |
{1:~ }|*5
|
]])
eq(old_buf, api.nvim_get_current_buf())
eq(false, api.nvim_buf_is_valid(term_buf))
term_buf = api.nvim_get_current_buf()
fn.chanclose(api.nvim_open_term(term_buf, {}))
screen:expect([[
^ |
[Terminal closed] |
|*5
]])
-- Autocommand should not result in a heap UAF if it frees the terminal prematurely.
command('autocmd TermLeave * ++once bwipeout!')
feed('ii')
screen:expect([[
^ |
{1:~ }|*5
|
]])
eq(false, api.nvim_buf_is_valid(term_buf))
end)
end)
describe('on_lines does not emit out-of-bounds line indexes when', function()

3
test/functional/terminal/window_spec.lua
View File

@@ -495,12 +495,13 @@ describe(':terminal window', function()
{1:-- TERMINAL --} |
]])
command('tabprevious')
-- TODO(seandewar): w_wrow's wrong if the terminal doesn't match the window size...
screen:expect([[
{1: }{5:2}{1: foo }{2: foo }{4: }{2:X}|
{19:r}ows: 5, cols: 25 │rows: 5, cols: 25 |
rows: 5, cols: 50 │rows: 5, cols: 50 |
{19: } │^ |
{19: } │ |
{19: } │^ |
{18:foo }{17:foo }|
{1:-- TERMINAL --} |
]])