!665 fix CVE-2024-47814
From: @changtao615 Reviewed-by: @dillon_chen Signed-off-by: @dillon_chen
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fix-CVE-2024-47814.patch
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117
fix-CVE-2024-47814.patch
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From 51b62387be93c65fa56bbabe1c3c1ea5df187641 Mon Sep 17 00:00:00 2001
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From: Christian Brabandt <cb@256bit.org>
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Date: Tue, 8 Oct 2024 09:24:30 +0800
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Subject: [PATCH] fix CVE-2024-47814
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Problem: [security]: use-after-free when closing a buffer
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Solution: When splitting the window and editing a new buffer,
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check whether the newly to be edited buffer has been marked
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for deletion and abort in this case
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Github Advisory:
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https://github.com/vim/vim/security/advisories/GHSA-rj48-v4mq-j4vg
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Signed-off-by: Christian Brabandt <cb@256bit.org>
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---
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src/buffer.c | 6 ++++++
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src/ex_cmds.c | 12 ++++++++++++
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src/proto/buffer.pro | 1 +
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src/testdir/test_autocmd.vim | 19 +++++++++++++++++++
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src/version.c | 2 ++
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5 files changed, 40 insertions(+)
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diff --git a/src/buffer.c b/src/buffer.c
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index 260d22e..6bdb7a6 100644
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--- a/src/buffer.c
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+++ b/src/buffer.c
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@@ -496,6 +496,12 @@ can_unload_buffer(buf_T *buf)
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return can_unload;
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}
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+ int
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+buf_locked(buf_T *buf)
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+{
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+ return buf->b_locked || buf->b_locked_split;
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+}
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+
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/*
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* Close the link to a buffer.
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* "action" is used when there is no longer a window for the buffer.
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diff --git a/src/ex_cmds.c b/src/ex_cmds.c
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index 46c4503..31cef2a 100644
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--- a/src/ex_cmds.c
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+++ b/src/ex_cmds.c
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@@ -2740,6 +2740,18 @@ do_ecmd(
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}
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if (buf == NULL)
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goto theend;
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+ // autocommands try to edit a file that is goind to be removed,
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+ // abort
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+ if (buf_locked(buf))
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+ {
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+ // window was split, but not editing the new buffer,
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+ // reset b_nwindows again
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+ if (oldwin == NULL
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+ && curwin->w_buffer != NULL
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+ && curwin->w_buffer->b_nwindows > 1)
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+ --curwin->w_buffer->b_nwindows;
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+ goto theend;
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+ }
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if (curwin->w_alt_fnum == buf->b_fnum && prev_alt_fnum != 0)
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// reusing the buffer, keep the old alternate file
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curwin->w_alt_fnum = prev_alt_fnum;
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diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
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index 3a61027..dc68ca8 100644
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--- a/src/proto/buffer.pro
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+++ b/src/proto/buffer.pro
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@@ -70,4 +70,5 @@ char_u *buf_get_fname(buf_T *buf);
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void set_buflisted(int on);
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int buf_contents_changed(buf_T *buf);
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void wipe_buffer(buf_T *buf, int aucmd);
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+int buf_locked(buf_T *buf);
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/* vim: set ft=c : */
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diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
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index 0652a6f..3abde1e 100644
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--- a/src/testdir/test_autocmd.vim
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+++ b/src/testdir/test_autocmd.vim
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@@ -4311,4 +4311,23 @@ func Test_autocmd_shortmess()
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delfunc SetupVimTest_shm
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endfunc
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+" This was using freed memory
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+func Test_autocmd_BufWinLeave_with_vsp()
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+ new
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+ let fname = 'XXXBufWinLeaveUAF.txt'
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+ let dummy = 'XXXDummy.txt'
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+ call writefile([], fname)
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+ call writefile([], dummy)
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+ defer delete(fname)
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+ defer delete(dummy)
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+ exe "e " fname
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+ vsp
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+ augroup testing
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+ exe "au BufWinLeave " .. fname .. " :e " dummy .. "| vsp " .. fname
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+ augroup END
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+ bw
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+ call CleanUpTestAuGroup()
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+ exe "bw! " .. dummy
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+endfunc
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+
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" vim: shiftwidth=2 sts=2 expandtab
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diff --git a/src/version.c b/src/version.c
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index 10916ed..286a45f 100644
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--- a/src/version.c
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+++ b/src/version.c
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@@ -704,6 +704,8 @@ static char *(features[]) =
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static int included_patches[] =
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{ /* Add new patch number below this line */
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+/**/
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+ 679,
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/**/
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678,
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/**/
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--
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2.43.0
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9
vim.spec
9
vim.spec
@ -14,7 +14,7 @@
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Name: vim
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Epoch: 2
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Version: %{baseversion}.%{patchlevel}
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Release: 11
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Release: 12
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Summary: Vim is a highly configurable text editor for efficiently creating and changing any kind of text.
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License: Vim and MIT
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URL: http://www.vim.org
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@ -52,6 +52,7 @@ Patch6017: backport-CVE-2024-43374.patch
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Patch6018: backport-CVE-2024-43802.patch
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Patch9000: bugfix-rm-modify-info-version.patch
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Patch9001: fix-CVE-2024-47814.patch
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BuildRequires: autoconf python3-devel ncurses-devel gettext perl-devel perl-generators gcc
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BuildRequires: perl(ExtUtils::Embed) perl(ExtUtils::ParseXS) libacl-devel gpm-devel file
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@ -457,6 +458,12 @@ LC_ALL=en_US.UTF-8 make -j1 test || echo "Warning: Please check tests."
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%{_mandir}/man1/evim.*
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%changelog
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* Tue Oct 08 2024 changtao <changtao@kylinos.cn> - 2:9.0.2092-12
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- Type:CVE
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- ID:CVE-2024-47814
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- SUG:NA
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- DESC:fix CVE-2024-47814
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* Thu Aug 29 2024 wangjiang <app@cameyan.com> - 2:9.0.2092-11
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- Type:CVE
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- ID:CVE-2024-43802
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