From 444e1ffe3e9c093d764eeda4d469abe46c6c1565 Mon Sep 17 00:00:00 2001 From: zeertzjq Date: Sun, 28 Dec 2025 08:37:55 +0800 Subject: [PATCH] vim-patch:9.1.2028: [security]: Buffer-overflow with incomplete multi-byte chars (#37133) Problem: Buffer overflow in buf_write() when converting incomplete multi-byte characters (Kevin Goodsell) Solution: Make the buffer slightly larger closes: vim/vim#19007 https://github.com/vim/vim/commit/f99de42a9fbc2caaac2741a275b6c25421582cf4 Co-authored-by: Christian Brabandt --- src/nvim/bufwrite.c | 17 +++++++++++++++-- test/functional/legacy/crash_spec.lua | 10 ++++++++++ test/old/testdir/samples/buffer-test.txt | 1 + test/old/testdir/test_crash.vim | 18 ++++++++++++++++++ 4 files changed, 44 insertions(+), 2 deletions(-) create mode 100644 test/old/testdir/samples/buffer-test.txt diff --git a/src/nvim/bufwrite.c b/src/nvim/bufwrite.c index 8a7758e5e9..643a6c399f 100644 --- a/src/nvim/bufwrite.c +++ b/src/nvim/bufwrite.c @@ -286,6 +286,17 @@ static int buf_write_convert(struct bw_info *ip, char **bufp, int *lenp) c = n > 1 ? (unsigned)utf_ptr2char(*bufp + wlen) : (uint8_t)(*bufp)[wlen]; } + // Check that there is enough space + if (!(flags & FIO_LATIN1)) { + size_t need = (flags & FIO_UCS4) ? 4 : 2; + if ((flags & FIO_UTF16) && c >= 0x10000) { + need = 4; + } + + if ((size_t)(p - ip->bw_conv_buf) + need > ip->bw_conv_buflen) { + return FAIL; + } + } if (ucs2bytes(c, &p, flags) && !ip->bw_conv_error) { ip->bw_conv_error = true; @@ -1258,11 +1269,13 @@ int buf_write(buf_T *buf, char *fname, char *sfname, linenr_T start, linenr_T en if (converted) { wb_flags = get_fio_flags(fenc); if (wb_flags & (FIO_UCS2 | FIO_UCS4 | FIO_UTF16 | FIO_UTF8)) { + // overallocate a bit, in case we read incomplete multi-byte chars + int size = bufsize + CONV_RESTLEN; // Need to allocate a buffer to translate into. if (wb_flags & (FIO_UCS2 | FIO_UTF16 | FIO_UTF8)) { - write_info.bw_conv_buflen = (size_t)bufsize * 2; + write_info.bw_conv_buflen = (size_t)size * 2; } else { // FIO_UCS4 - write_info.bw_conv_buflen = (size_t)bufsize * 4; + write_info.bw_conv_buflen = (size_t)size * 4; } write_info.bw_conv_buf = verbose_try_malloc(write_info.bw_conv_buflen); if (!write_info.bw_conv_buf) { diff --git a/test/functional/legacy/crash_spec.lua b/test/functional/legacy/crash_spec.lua index b63b3146f4..24d72f4c4f 100644 --- a/test/functional/legacy/crash_spec.lua +++ b/test/functional/legacy/crash_spec.lua @@ -63,3 +63,13 @@ it('no crash when writing "Untitled" file fails', function() eq('Vim(enew):E502: "Untitled" is a directory', pcall_err(command, 'confirm enew')) assert_alive() end) + +-- oldtest: Test_crash_bufwrite() +it('no crash when converting buffer with incomplete multibyte chars', function() + command('edit ++bin test/old/testdir/samples/buffer-test.txt') + finally(function() + os.remove('Xoutput') + end) + command('w! ++enc=ucs4 Xoutput') + assert_alive() +end) diff --git a/test/old/testdir/samples/buffer-test.txt b/test/old/testdir/samples/buffer-test.txt new file mode 100644 index 0000000000..38f8880070 --- /dev/null +++ b/test/old/testdir/samples/buffer-test.txt @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/test/old/testdir/test_crash.vim b/test/old/testdir/test_crash.vim index 88713894d1..47fc9740a6 100644 --- a/test/old/testdir/test_crash.vim +++ b/test/old/testdir/test_crash.vim @@ -241,4 +241,22 @@ func TearDown() call delete('Untitled') endfunc +func Test_crash_bufwrite() + let lines =<< trim END + w! ++enc=ucs4 Xoutput + call writefile(['done'], 'Xbufwrite') + END + call writefile(lines, 'Xvimrc') + let opts = #{wait_for_ruler: 0, rows: 20} + let args = ' -u NONE -i NONE -b -S Xvimrc' + let buf = RunVimInTerminal(args .. ' samples/buffer-test.txt', opts) + call TermWait(buf, 1000) + call StopVimInTerminal(buf) + call WaitForAssert({-> assert_true(filereadable('Xbufwrite'))}) + call assert_equal(['done'], readfile('Xbufwrite')) + call delete('Xbufwrite') + call delete('Xoutput') + call delete('Xvimrc') +endfunc + " vim: shiftwidth=2 sts=2 expandtab