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File _service:tar_scm:backport-CVE-2024-43374.patch of Package vim
From 0a6e57b09bc8c76691b367a5babfb79b31b770e8 Mon Sep 17 00:00:00 2001 From: Christian Brabandt <cb@256bit.org> Date: Thu, 15 Aug 2024 22:15:28 +0200 Subject: [PATCH] patch 9.1.0678: [security]: use-after-free in alist_add() https://github.com/vim/vim/commit/0a6e57b09bc8c76691b367a5babfb79b31b770e8 Problem: [security]: use-after-free in alist_add() (SuyueGuo) Solution: Lock the current window, so that the reference to the argument list remains valid. This fixes CVE-2024-43374 Signed-off-by: Christian Brabandt <cb@256bit.org> --- src/arglist.c | 6 ++++++ src/buffer.c | 4 ++-- src/ex_cmds.c | 4 ++-- src/proto/window.pro | 1 + src/structs.h | 2 +- src/terminal.c | 4 ++-- src/testdir/test_arglist.vim | 23 +++++++++++++++++++++++ src/version.c | 2 ++ src/window.c | 29 +++++++++++++++++++---------- 9 files changed, 58 insertions(+), 17 deletions(-) diff --git a/src/arglist.c b/src/arglist.c index a63f6c7..050f96f 100644 --- a/src/arglist.c +++ b/src/arglist.c @@ -184,6 +184,8 @@ alist_set( /* * Add file "fname" to argument list "al". * "fname" must have been allocated and "al" must have been checked for room. + * + * May trigger Buf* autocommands */ void alist_add( @@ -196,6 +198,7 @@ alist_add( if (check_arglist_locked() == FAIL) return; arglist_locked = TRUE; + curwin->w_locked = TRUE; #ifdef BACKSLASH_IN_FILENAME slash_adjust(fname); @@ -207,6 +210,7 @@ alist_add( ++al->al_ga.ga_len; arglist_locked = FALSE; + curwin->w_locked = FALSE; } #if defined(BACKSLASH_IN_FILENAME) || defined(PROTO) @@ -365,6 +369,7 @@ alist_add_list( mch_memmove(&(ARGLIST[after + count]), &(ARGLIST[after]), (ARGCOUNT - after) * sizeof(aentry_T)); arglist_locked = TRUE; + curwin->w_locked = TRUE; for (i = 0; i < count; ++i) { int flags = BLN_LISTED | (will_edit ? BLN_CURBUF : 0); @@ -373,6 +378,7 @@ alist_add_list( ARGLIST[after + i].ae_fnum = buflist_add(files[i], flags); } arglist_locked = FALSE; + curwin->w_locked = FALSE; ALIST(curwin)->al_ga.ga_len += count; if (old_argcount > 0 && curwin->w_arg_idx >= after) curwin->w_arg_idx += count; diff --git a/src/buffer.c b/src/buffer.c index ccd095b..260d22e 100644 --- a/src/buffer.c +++ b/src/buffer.c @@ -1456,7 +1456,7 @@ do_buffer_ext( // (unless it's the only window). Repeat this so long as we end up in // a window with this buffer. while (buf == curbuf - && !(curwin->w_closing || curwin->w_buffer->b_locked > 0) + && !(win_locked(curwin) || curwin->w_buffer->b_locked > 0) && (!ONE_WINDOW || first_tabpage->tp_next != NULL)) { if (win_close(curwin, FALSE) == FAIL) @@ -5443,7 +5443,7 @@ ex_buffer_all(exarg_T *eap) : wp->w_width != Columns) || (had_tab > 0 && wp != firstwin)) && !ONE_WINDOW - && !(wp->w_closing || wp->w_buffer->b_locked > 0) + && !(win_locked(wp) || wp->w_buffer->b_locked > 0) && !win_unlisted(wp)) { if (win_close(wp, FALSE) == FAIL) diff --git a/src/ex_cmds.c b/src/ex_cmds.c index a08682b..46c4503 100644 --- a/src/ex_cmds.c +++ b/src/ex_cmds.c @@ -2827,7 +2827,7 @@ do_ecmd( // Set the w_closing flag to avoid that autocommands close the // window. And set b_locked for the same reason. - the_curwin->w_closing = TRUE; + the_curwin->w_locked = TRUE; ++buf->b_locked; if (curbuf == old_curbuf.br_buf) @@ -2841,7 +2841,7 @@ do_ecmd( // Autocommands may have closed the window. if (win_valid(the_curwin)) - the_curwin->w_closing = FALSE; + the_curwin->w_locked = FALSE; --buf->b_locked; #ifdef FEAT_EVAL diff --git a/src/proto/window.pro b/src/proto/window.pro index cfb771d..12edf0b 100644 --- a/src/proto/window.pro +++ b/src/proto/window.pro @@ -93,4 +93,5 @@ int win_hasvertsplit(void); int get_win_number(win_T *wp, win_T *first_win); int get_tab_number(tabpage_T *tp); char *check_colorcolumn(win_T *wp); +int win_locked(win_T *wp); /* vim: set ft=c : */ diff --git a/src/structs.h b/src/structs.h index 6d9dcbb..1f4742b 100644 --- a/src/structs.h +++ b/src/structs.h @@ -3740,7 +3740,7 @@ struct window_S synblock_T *w_s; // for :ownsyntax #endif - int w_closing; // window is being closed, don't let + int w_locked; // window is being closed, don't let // autocommands close it too. frame_T *w_frame; // frame containing this window diff --git a/src/terminal.c b/src/terminal.c index f79d102..37cd0f2 100644 --- a/src/terminal.c +++ b/src/terminal.c @@ -3669,10 +3669,10 @@ term_after_channel_closed(term_T *term) if (is_aucmd_win(curwin)) do_set_w_closing = TRUE; if (do_set_w_closing) - curwin->w_closing = TRUE; + curwin->w_locked = TRUE; do_bufdel(DOBUF_WIPE, (char_u *)"", 1, fnum, fnum, FALSE); if (do_set_w_closing) - curwin->w_closing = FALSE; + curwin->w_locked = FALSE; aucmd_restbuf(&aco); } #ifdef FEAT_PROP_POPUP diff --git a/src/testdir/test_arglist.vim b/src/testdir/test_arglist.vim index edc8b77..8d81a82 100644 --- a/src/testdir/test_arglist.vim +++ b/src/testdir/test_arglist.vim @@ -359,6 +359,7 @@ func Test_argv() call assert_equal('', argv(1, 100)) call assert_equal([], argv(-1, 100)) call assert_equal('', argv(10, -1)) + %argdelete endfunc " Test for the :argedit command @@ -744,4 +745,26 @@ func Test_all_command() %bw! endfunc +" Test for deleting buffer when creating an arglist. This was accessing freed +" memory +func Test_crash_arglist_uaf() + "%argdelete + new one + au BufAdd XUAFlocal :bw + "call assert_fails(':arglocal XUAFlocal', 'E163:') + arglocal XUAFlocal + au! BufAdd + bw! XUAFlocal + + au BufAdd XUAFlocal2 :bw + new two + new three + arglocal + argadd XUAFlocal2 Xfoobar + bw! XUAFlocal2 + bw! two + + au! BufAdd +endfunc + " vim: shiftwidth=2 sts=2 expandtab diff --git a/src/version.c b/src/version.c index 555ef9f..10916ed 100644 --- a/src/version.c +++ b/src/version.c @@ -704,6 +704,8 @@ static char *(features[]) = static int included_patches[] = { /* Add new patch number below this line */ +/**/ + 678, /**/ 2092, /**/ diff --git a/src/window.c b/src/window.c index 2afa28d..e2a7393 100644 --- a/src/window.c +++ b/src/window.c @@ -2441,7 +2441,7 @@ close_windows( for (wp = firstwin; wp != NULL && !ONE_WINDOW; ) { if (wp->w_buffer == buf && (!keep_curwin || wp != curwin) - && !(wp->w_closing || wp->w_buffer->b_locked > 0)) + && !(win_locked(wp) || wp->w_buffer->b_locked > 0)) { if (win_close(wp, FALSE) == FAIL) // If closing the window fails give up, to avoid looping @@ -2462,7 +2462,7 @@ close_windows( if (tp != curtab) FOR_ALL_WINDOWS_IN_TAB(tp, wp) if (wp->w_buffer == buf - && !(wp->w_closing || wp->w_buffer->b_locked > 0)) + && !(win_locked(wp) || wp->w_buffer->b_locked > 0)) { win_close_othertab(wp, FALSE, tp); @@ -2584,10 +2584,10 @@ win_close_buffer(win_T *win, int action, int abort_if_last) bufref_T bufref; set_bufref(&bufref, curbuf); - win->w_closing = TRUE; + win->w_locked = TRUE; close_buffer(win, win->w_buffer, action, abort_if_last, TRUE); if (win_valid_any_tab(win)) - win->w_closing = FALSE; + win->w_locked = FALSE; // Make sure curbuf is valid. It can become invalid if 'bufhidden' is // "wipe". if (!bufref_valid(&bufref)) @@ -2635,7 +2635,7 @@ win_close(win_T *win, int free_buf) if (window_layout_locked(CMD_close)) return FAIL; - if (win->w_closing || (win->w_buffer != NULL + if (win_locked(win) || (win->w_buffer != NULL && win->w_buffer->b_locked > 0)) return FAIL; // window is already being closed if (win_unlisted(win)) @@ -2684,19 +2684,19 @@ win_close(win_T *win, int free_buf) other_buffer = TRUE; if (!win_valid(win)) return FAIL; - win->w_closing = TRUE; + win->w_locked = TRUE; apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf); if (!win_valid(win)) return FAIL; - win->w_closing = FALSE; + win->w_locked = FALSE; if (last_window()) return FAIL; } - win->w_closing = TRUE; + win->w_locked = TRUE; apply_autocmds(EVENT_WINLEAVE, NULL, NULL, FALSE, curbuf); if (!win_valid(win)) return FAIL; - win->w_closing = FALSE; + win->w_locked = FALSE; if (last_window()) return FAIL; #ifdef FEAT_EVAL @@ -3269,7 +3269,7 @@ win_close_othertab(win_T *win, int free_buf, tabpage_T *tp) // Get here with win->w_buffer == NULL when win_close() detects the tab // page changed. - if (win->w_closing || (win->w_buffer != NULL + if (win_locked(win) || (win->w_buffer != NULL && win->w_buffer->b_locked > 0)) return; // window is already being closed @@ -7792,3 +7792,12 @@ skip: return NULL; // no error } #endif + +/* + * Don't let autocommands close the given window + */ + int +win_locked(win_T *wp) +{ + return wp->w_locked; +} -- 2.43.0
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