commit 444e1ffe3e9c093d764eeda4d469abe46c6c1565
parent 80a8c3d23baeaa69b99b6871f5d5f03c3adb0ae0
Author: zeertzjq <zeertzjq@outlook.com>
Date: Sun, 28 Dec 2025 08:37:55 +0800
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 <cb@256bit.org>
Diffstat:
4 files changed, 45 insertions(+), 2 deletions(-)
diff --git 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
@@ -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
@@ -0,0 +1 @@
+0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456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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
@@ -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
