gitweb: Secure against commit-ish/tree-ish with the same name as path

Add "--" after <commit-ish> or <tree-ish> argument to clearly mark it
as <commit-ish> or <tree-ish> and not pathspec, securing against refs
with the same names as files or directories in [live] repository.

Some wrapping to reduce line length as well.

[jc: with "oops, ls-tree does not want --" fix-up manually applied.]

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index bfadbe25c6f250bf88769aee7449615af4469e65..6035980c3044beffa658155233d846137d1574a5 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -1111,7 +1111,9 @@ sub parse_commit {
                @commit_lines = @$commit_text;
        } else {
                local $/ = "\0";
-               open my $fd, "-|", git_cmd(), "rev-list", "--header", "--parents", "--max-count=1", $commit_id
+               open my $fd, "-|", git_cmd(), "rev-list",
+                       "--header", "--parents", "--max-count=1",
+                       $commit_id, "--"
                        or return;
                @commit_lines = split '\n', <$fd>;
                close $fd or return;
@@ -2529,7 +2531,7 @@ sub git_summary {
        }
 
        open my $fd, "-|", git_cmd(), "rev-list", "--max-count=17",
-               git_get_head_hash($project)
+               git_get_head_hash($project), "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd;
@@ -3072,7 +3074,7 @@ sub git_log {
        my $refs = git_get_references();
 
        my $limit = sprintf("--max-count=%i", (100 * ($page+1)));
-       open my $fd, "-|", git_cmd(), "rev-list", $limit, $hash
+       open my $fd, "-|", git_cmd(), "rev-list", $limit, $hash, "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd;
@@ -3130,7 +3132,7 @@ sub git_commit {
                $parent = "--root";
        }
        open my $fd, "-|", git_cmd(), "diff-tree", '-r', "--no-commit-id",
-               @diff_opts, $parent, $hash
+               @diff_opts, $parent, $hash, "--"
                or die_error(undef, "Open git-diff-tree failed");
        my @difftree = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading git-diff-tree failed");
@@ -3235,7 +3237,8 @@ sub git_blobdiff {
        if (defined $hash_base && defined $hash_parent_base) {
                if (defined $file_name) {
                        # read raw output
-                       open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts, $hash_parent_base, $hash_base,
+                       open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
+                               $hash_parent_base, $hash_base,
                                "--", $file_name
                                or die_error(undef, "Open git-diff-tree failed");
                        @difftree = map { chomp; $_ } <$fd>;
@@ -3249,7 +3252,8 @@ sub git_blobdiff {
                        # try to find filename from $hash
 
                        # read filtered raw output
-                       open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts, $hash_parent_base, $hash_base
+                       open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
+                               $hash_parent_base, $hash_base, "--"
                                or die_error(undef, "Open git-diff-tree failed");
                        @difftree =
                                # ':100644 100644 03b21826... 3b93d5e7... M     ls-files.c'
@@ -3319,7 +3323,8 @@ sub git_blobdiff {
                }
 
                # open patch output
-               open $fd, "-|", git_cmd(), "diff", '-p', @diff_opts, $hash_parent, $hash
+               open $fd, "-|", git_cmd(), "diff", '-p', @diff_opts,
+                       $hash_parent, $hash, "--"
                        or die_error(undef, "Open git-diff failed");
        } else  {
                die_error('404 Not Found', "Missing one of the blob diff parameters")
@@ -3450,8 +3455,8 @@ sub git_commitdiff {
        my @difftree;
        if ($format eq 'html') {
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
-                       "--no-commit-id",
-                       "--patch-with-raw", "--full-index", $hash_parent, $hash
+                       "--no-commit-id", "--patch-with-raw", "--full-index",
+                       $hash_parent, $hash, "--"
                        or die_error(undef, "Open git-diff-tree failed");
 
                while (chomp(my $line = <$fd>)) {
@@ -3462,7 +3467,7 @@ sub git_commitdiff {
 
        } elsif ($format eq 'plain') {
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
-                       '-p', $hash_parent, $hash
+                       '-p', $hash_parent, $hash, "--"
                        or die_error(undef, "Open git-diff-tree failed");
 
        } else {
@@ -3639,7 +3644,9 @@ sub git_search {
        my $alternate = 1;
        if ($searchtype eq 'commit' or $searchtype eq 'author' or $searchtype eq 'committer') {
                $/ = "\0";
-               open my $fd, "-|", git_cmd(), "rev-list", "--header", "--parents", $hash or next;
+               open my $fd, "-|", git_cmd(), "rev-list",
+                       "--header", "--parents", $hash, "--"
+                       or next;
                while (my $commit_text = <$fd>) {
                        if (!grep m/$searchtext/i, $commit_text) {
                                next;
@@ -3785,7 +3792,7 @@ sub git_shortlog {
        my $refs = git_get_references();
 
        my $limit = sprintf("--max-count=%i", (100 * ($page+1)));
-       open my $fd, "-|", git_cmd(), "rev-list", $limit, $hash
+       open my $fd, "-|", git_cmd(), "rev-list", $limit, $hash, "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd;
@@ -3813,7 +3820,8 @@ sub git_shortlog {
 
 sub git_rss {
        # http://www.notestips.com/80256B3A007F2692/1/NAMO5P9UPQ
-       open my $fd, "-|", git_cmd(), "rev-list", "--max-count=150", git_get_head_hash($project)
+       open my $fd, "-|", git_cmd(), "rev-list", "--max-count=150",
+               git_get_head_hash($project), "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading git-rev-list failed");
@@ -3837,7 +3845,7 @@ XML
                }
                my %cd = parse_date($co{'committer_epoch'});
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
-                       $co{'parent'}, $co{'id'}
+                       $co{'parent'}, $co{'id'}, "--"
                        or next;
                my @difftree = map { chomp; $_ } <$fd>;
                close $fd