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CVE: CVE-2021-3872
Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@arm.com>
From 61629ea24a2fff1f89c37479d3fb52f17c3480fc Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Fri, 8 Oct 2021 18:39:28 +0100
Subject: [PATCH] patch 8.2.3487: illegal memory access if buffer name is very
long
Problem: Illegal memory access if buffer name is very long.
Solution: Make sure not to go over the end of the buffer.
---
src/drawscreen.c | 10 +++++-----
src/testdir/test_statusline.vim | 11 +++++++++++
src/version.c | 2 ++
3 files changed, 18 insertions(+), 5 deletions(-)
diff --git a/src/drawscreen.c b/src/drawscreen.c
index 3a88ee979..9acb70552 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -446,13 +446,13 @@ win_redr_status(win_T *wp, int ignore_pum UNUSED)
*(p + len++) = ' ';
if (bt_help(wp->w_buffer))
{
- STRCPY(p + len, _("[Help]"));
+ vim_snprintf((char *)p + len, MAXPATHL - len, "%s", _("[Help]"));
len += (int)STRLEN(p + len);
}
#ifdef FEAT_QUICKFIX
if (wp->w_p_pvw)
{
- STRCPY(p + len, _("[Preview]"));
+ vim_snprintf((char *)p + len, MAXPATHL - len, "%s", _("[Preview]"));
len += (int)STRLEN(p + len);
}
#endif
@@ -462,12 +462,12 @@ win_redr_status(win_T *wp, int ignore_pum UNUSED)
#endif
)
{
- STRCPY(p + len, "[+]");
- len += 3;
+ vim_snprintf((char *)p + len, MAXPATHL - len, "%s", "[+]");
+ len += (int)STRLEN(p + len);
}
if (wp->w_buffer->b_p_ro)
{
- STRCPY(p + len, _("[RO]"));
+ vim_snprintf((char *)p + len, MAXPATHL - len, "%s", _("[RO]"));
len += (int)STRLEN(p + len);
}
diff --git a/src/testdir/test_statusline.vim b/src/testdir/test_statusline.vim
index 1f705b847..91bce1407 100644
--- a/src/testdir/test_statusline.vim
+++ b/src/testdir/test_statusline.vim
@@ -393,3 +393,14 @@ func Test_statusline_visual()
bwipe! x1
bwipe! x2
endfunc
+" Used to write beyond allocated memory. This assumes MAXPATHL is 4096 bytes.
+func Test_statusline_verylong_filename()
+ let fname = repeat('x', 4090)
+ exe "new " .. fname
+ set buftype=help
+ set previewwindow
+ redraw
+ bwipe!
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 1046993d6..2b5de5ccf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 3487,
/**/
3428,
/**/
|
