patch 9.1.2028: [security]: Buffer-overflow with incomplete multi-byte chars

Problem:  Buffer overflow in buf_write() when converting incomplete
          multi-byte characters (Kevin Goodsell)
Solution: Make the buffer slightly larger

closes: #19007

Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/src/bufwrite.c b/src/bufwrite.c
index c1a495318865a6d93c50ad5243320bdca469a930..77efb30ded6cdbaa0834731645217b4aba5ceb5f 100644 (file)
--- a/src/bufwrite.c
+++ b/src/bufwrite.c
@@ -229,6 +229,16 @@ buf_write_bytes(struct bw_info *ip)
                    else
                        c = buf[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)
                {
@@ -1698,11 +1708,13 @@ buf_write(
        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 = bufsize * 2;
+               write_info.bw_conv_buflen = size * 2;
            else // FIO_UCS4
-               write_info.bw_conv_buflen = bufsize * 4;
+               write_info.bw_conv_buflen = size * 4;
            write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen);
            if (write_info.bw_conv_buf == NULL)
                end = 0;

diff --git a/src/testdir/samples/buffer-test.txt b/src/testdir/samples/buffer-test.txt
new file mode 100644 (file)
index 0000000..38f8880
--- /dev/null
+++ b/src/testdir/samples/buffer-test.txt
@@ -0,0 +1 @@
+0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456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\ No newline at end of file

diff --git a/src/testdir/test_crash.vim b/src/testdir/test_crash.vim
index 01ae64fbd0e766155349648f4bfb4a93c6ec24d0..9b673e4e2a91dfbea0d2473b249921d3fc31319b 100644 (file)
--- a/src/testdir/test_crash.vim
+++ b/src/testdir/test_crash.vim
@@ -261,4 +261,22 @@ 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

diff --git a/src/version.c b/src/version.c
index a4d0ed19afb67a5985487cc8e3c58e53d9946255..0aa6ace8a3d5ef5cd4039b9e1e8d22f3caacb35c 100644 (file)
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2028,
 /**/
     2027,
 /**/