Mercurial > vim
view src/testdir/test_wordcount.vim @ 33811:06219b3bdaf3 v9.0.2121
patch 9.0.2121: [security]: use-after-free in ex_substitute
Commit: https://github.com/vim/vim/commit/26c11c56888d01e298cd8044caf860f3c26f57bb
Author: Christian Brabandt <cb@256bit.org>
Date: Wed Nov 22 21:26:41 2023 +0100
patch 9.0.2121: [security]: use-after-free in ex_substitute
Problem: [security]: use-after-free in ex_substitute
Solution: always allocate memory
closes: #13552
A recursive :substitute command could cause a heap-use-after free in Vim
(CVE-2023-48706).
The whole reproducible test is a bit tricky, I can only reproduce this
reliably when no previous substitution command has been used yet
(which is the reason, the test needs to run as first one in the
test_substitute.vim file) and as a combination of the `:~` command
together with a :s command that contains the special substitution atom `~\=`
which will make use of a sub-replace special atom and calls a vim script
function.
There was a comment in the existing :s code, that already makes the
`sub` variable allocate memory so that a recursive :s call won't be able
to cause any issues here, so this was known as a potential problem
already. But for the current test-case that one does not work, because
the substitution does not start with `\=` but with `~\=` (and since
there does not yet exist a previous substitution atom, Vim will simply
increment the `sub` pointer (which then was not allocated dynamically)
and later one happily use a sub-replace special expression (which could
then free the `sub` var).
The following commit fixes this, by making the sub var always using
allocated memory, which also means we need to free the pointer whenever
we leave the function. Since sub is now always an allocated variable,
we also do no longer need the sub_copy variable anymore, since this one
was used to indicated when sub pointed to allocated memory (and had
therefore to be freed on exit) and when not.
Github Security Advisory:
https://github.com/vim/vim/security/advisories/GHSA-c8qm-x72m-q53q
Signed-off-by: Christian Brabandt <cb@256bit.org>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Wed, 22 Nov 2023 22:15:05 +0100 |
parents | 08940efa6b4e |
children |
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" Test for wordcount() function func Test_wordcount() let save_enc = &enc set encoding=utf-8 set selection=inclusive fileformat=unix fileformats=unix new " Test 1: empty window call assert_equal({'chars': 0, 'cursor_chars': 0, 'words': 0, 'cursor_words': 0, \ 'bytes': 0, 'cursor_bytes': 0}, wordcount()) " Test 2: some words, cursor at start call append(1, 'one two three') call cursor([1, 1, 0]) call assert_equal({'chars': 15, 'cursor_chars': 1, 'words': 3, 'cursor_words': 0, \ 'bytes': 15, 'cursor_bytes': 1}, wordcount()) " Test 3: some words, cursor at end %d _ call append(1, 'one two three') call cursor([2, 99, 0]) call assert_equal({'chars': 15, 'cursor_chars': 14, 'words': 3, 'cursor_words': 3, \ 'bytes': 15, 'cursor_bytes': 14}, wordcount()) " Test 4: some words, cursor at end, ve=all set ve=all %d _ call append(1, 'one two three') call cursor([2, 99, 0]) call assert_equal({'chars': 15, 'cursor_chars': 15, 'words': 3, 'cursor_words': 3, \ 'bytes': 15, 'cursor_bytes': 15}, wordcount()) set ve= " Test 5: several lines with words %d _ call append(1, ['one two three', 'one two three', 'one two three']) call cursor([4, 99, 0]) call assert_equal({'chars': 43, 'cursor_chars': 42, 'words': 9, 'cursor_words': 9, \ 'bytes': 43, 'cursor_bytes': 42}, wordcount()) " Test 6: one line with BOM set %d _ call append(1, 'one two three') set bomb w! Xtest call cursor([2, 99, 0]) call assert_equal({'chars': 15, 'cursor_chars': 14, 'words': 3, 'cursor_words': 3, \ 'bytes': 18, 'cursor_bytes': 14}, wordcount()) set nobomb w! call delete('Xtest') " Test 7: one line with multibyte words %d _ call append(1, ['Äne M¤ne Müh']) call cursor([2, 99, 0]) call assert_equal({'chars': 14, 'cursor_chars': 13, 'words': 3, 'cursor_words': 3, \ 'bytes': 17, 'cursor_bytes': 16}, wordcount()) " Test 8: several lines with multibyte words %d _ call append(1, ['Äne M¤ne Müh', 'und raus bist dü!']) call cursor([3, 99, 0]) call assert_equal({'chars': 32, 'cursor_chars': 31, 'words': 7, 'cursor_words': 7, \ 'bytes': 36, 'cursor_bytes': 35}, wordcount()) " Visual map to capture wordcount() in visual mode vnoremap <expr> <F2> execute("let g:visual_stat = wordcount()") " Test 9: visual mode, complete buffer let g:visual_stat = {} %d _ call append(1, ['Äne M¤ne Müh', 'und raus bist dü!']) " start visual mode and select the complete buffer 0 exe "normal V2j\<F2>y" call assert_equal({'chars': 32, 'words': 7, 'bytes': 36, 'visual_chars': 32, \ 'visual_words': 7, 'visual_bytes': 36}, g:visual_stat) " Test 10: visual mode (empty) %d _ call append(1, ['Äne M¤ne Müh', 'und raus bist dü!']) " start visual mode and select the complete buffer 0 exe "normal v$\<F2>y" call assert_equal({'chars': 32, 'words': 7, 'bytes': 36, 'visual_chars': 1, \ 'visual_words': 0, 'visual_bytes': 1}, g:visual_stat) " Test 11: visual mode, single line %d _ call append(1, ['Äne M¤ne Müh', 'und raus bist dü!']) " start visual mode and select the complete buffer 2 exe "normal 0v$\<F2>y" call assert_equal({'chars': 32, 'words': 7, 'bytes': 36, 'visual_chars': 13, \ 'visual_words': 3, 'visual_bytes': 16}, g:visual_stat) set selection& fileformat& fileformats& let &enc = save_enc enew! close endfunc " vim: shiftwidth=2 sts=2 expandtab