Merge branch 'js/fix-open-exec-git'

This addresses CVE-2025-46835, Git GUI can create and overwrite a
user's files:

When a user clones an untrusted repository and is tricked into editing
a file located in a maliciously named directory in the repository, then
Git GUI can create and overwrite files for which the user has write
permission.

* js/fix-open-exec-git:
  git-gui: sanitize 'exec' arguments: convert new 'cygpath' calls
  git-gui: do not mistake command arguments as redirection operators
  git-gui: introduce function git_redir for git calls with redirections
  git-gui: pass redirections as separate argument to git_read
  git-gui: pass redirections as separate argument to _open_stdout_stderr
  git-gui: convert git_read*, git_write to be non-variadic
  git-gui: use git_read in githook_read
  git-gui: break out a separate function git_read_nice
  git-gui: remove option --stderr from git_read
  git-gui: sanitize 'exec' arguments: background
  git-gui: sanitize 'exec' arguments: simple cases
  git-gui: treat file names beginning with "|" as relative paths
  git-gui: remove git config --list handling for git < 1.5.3
  git-gui: remove HEAD detachment implementation for git < 1.5.3
  git-gui: remove Tcl 8.4 workaround on 2>@1 redirection

Signed-off-by: Johannes Sixt <j6t@kdbg.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/lib/commit.tcl b/lib/commit.tcl
index 0c2be6f619..37b3808f7e 100644
--- a/lib/commit.tcl
+++ b/lib/commit.tcl
@@ -27,7 +27,7 @@ You are currently in the middle of a merge that has not been fully completed.  Y
 	if {[catch {
 			set name ""
 			set email ""
-			set fd [git_read cat-file commit $curHEAD]
+			set fd [git_read [list cat-file commit $curHEAD]]
 			fconfigure $fd -encoding binary -translation lf
 			# By default commits are assumed to be in utf-8
 			set enc utf-8
@@ -234,7 +234,7 @@ A good commit message has the following format:
 	# -- Build the message file.
 	#
 	set msg_p [gitdir GITGUI_EDITMSG]
-	set msg_wt [open $msg_p w]
+	set msg_wt [safe_open_file $msg_p w]
 	fconfigure $msg_wt -translation lf
 	setup_commit_encoding $msg_wt
 	puts $msg_wt $msg
@@ -334,7 +334,7 @@ proc commit_commitmsg_wait {fd_ph curHEAD msg_p} {
 
 proc commit_writetree {curHEAD msg_p} {
 	ui_status [mc "Committing changes..."]
-	set fd_wt [git_read write-tree]
+	set fd_wt [git_read [list write-tree]]
 	fileevent $fd_wt readable \
 		[list commit_committree $fd_wt $curHEAD $msg_p]
 }
@@ -359,7 +359,7 @@ proc commit_committree {fd_wt curHEAD msg_p} {
 	# -- Verify this wasn't an empty change.
 	#
 	if {$commit_type eq {normal}} {
-		set fd_ot [git_read cat-file commit $PARENT]
+		set fd_ot [git_read [list cat-file commit $PARENT]]
 		fconfigure $fd_ot -encoding binary -translation lf
 		set old_tree [gets $fd_ot]
 		close $fd_ot
@@ -397,8 +397,8 @@ A rescan will be automatically started now.
 	foreach p [concat $PARENT $MERGE_HEAD] {
 		lappend cmd -p $p
 	}
-	lappend cmd <$msg_p
-	if {[catch {set cmt_id [eval git $cmd]} err]} {
+	set msgtxt [list <$msg_p]
+	if {[catch {set cmt_id [git_redir $cmd $msgtxt]} err]} {
 		catch {file delete $msg_p}
 		error_popup [strcat [mc "commit-tree failed:"] "\n\n$err"]
 		ui_status [mc "Commit failed."]
@@ -418,7 +418,7 @@ A rescan will be automatically started now.
 	if {$commit_type ne {normal}} {
 		append reflogm " ($commit_type)"
 	}
-	set msg_fd [open $msg_p r]
+	set msg_fd [safe_open_file $msg_p r]
 	setup_commit_encoding $msg_fd 1
 	gets $msg_fd subject
 	close $msg_fd