File _service:tar_scm:backport-Add--bind-fd-and--ro-... of Package bubblewrap

File _service:tar_scm:backport-Add--bind-fd-and--ro-bind-fd-to-let-you-bind-a-O_PATH-fd.patch of Package bubblewrap

From a253257cd298892da43e15201d83f9a02c9b58b5 Mon Sep 17 00:00:00 2001
From: Alexander Larsson <alexl@redhat.com>
Date: Tue, 18 Jun 2024 10:20:36 +0200
Subject: [PATCH] Add --bind-fd and --ro-bind-fd to let you bind a O_PATH fd.

Origin: https://github.com/containers/bubblewrap/commit/a253257cd298892da43e15201d83f9a02c9b58b5

This is useful for example if you for some reason don't have the real
path. It is also a way to make bind-mounts race-free (i.e. to have the
mount actually be the thing you wanted to be mounted, avoiding issues
where some other process replaces the target in parallel with the bwrap
launch.

Unfortunately due to some technical details we can't actually directly
mount the dirfd, as they come from different user namespace which is not
permitted, but at least we can delay resolving the fd to a path as much as
possible, and then validate after mount that we actually mounted the right
thing.

Signed-off-by: Alexander Larsson <alexl@redhat.com>
---
 bubblewrap.c      | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 tests/test-run.sh |  6 ++++++
 2 files changed, 56 insertions(+)

diff --git a/bubblewrap.c b/bubblewrap.c
index c414bb06..bc75da47 100644
--- a/bubblewrap.c
+++ b/bubblewrap.c
@@ -341,6 +341,8 @@ usage (int ecode, FILE *out)
            "    --dev-bind-try SRC DEST      Equal to --dev-bind but ignores non-existent SRC\n"
            "    --ro-bind SRC DEST           Bind mount the host path SRC readonly on DEST\n"
            "    --ro-bind-try SRC DEST       Equal to --ro-bind but ignores non-existent SRC\n"
+           "    --bind-fd FD DEST            Bind open directory or path fd on DEST\n"
+           "    --ro-bind-fd FD DEST         Bind open directory or path fd read-only on DEST\n"
            "    --remount-ro DEST            Remount DEST as readonly; does not recursively remount\n"
            "    --exec-label LABEL           Exec label for the sandbox\n"
            "    --file-label LABEL           File label for temporary sandbox content\n"
@@ -1231,6 +1233,30 @@ setup_newroot (bool unshare_pid,
                          (op->type == SETUP_RO_BIND_MOUNT ? BIND_READONLY : 0) |
                          (op->type == SETUP_DEV_BIND_MOUNT ? BIND_DEVICES : 0),
                          0, 0, source, dest);
+
+          if (op->fd >= 0)
+            {
+              struct stat fd_st, mount_st;
+
+              /* When using bind-fd, there is a race condition between resolving the fd as a magic symlink
+               * and mounting it, where someone could replace what is at the symlink target. Ideally
+               * we would not even resolve the symlink and directly bind-mount from the fd, but unfortunately
+               * we can't do that, because its not permitted to bind mount a fd from another user namespace.
+               * So, we resolve, mount and then compare fstat+stat to detect the race. */
+
+              if (fstat(op->fd, &fd_st) != 0)
+                die_with_error("Can't stat fd %d", op->fd);
+              if (lstat(dest, &mount_st) != 0)
+                die_with_error("Can't stat mount at %s", dest);
+
+              if (fd_st.st_ino != mount_st.st_ino ||
+                  fd_st.st_dev != mount_st.st_dev)
+                die_with_error("Race condition binding dirfd");
+
+              close(op->fd);
+              op->fd = -1;
+            }
+
           break;
 
         case SETUP_REMOUNT_RO_NO_RECURSIVE:
@@ -1874,6 +1900,30 @@ parse_args_recurse (int          *argcp,
           if (strcmp(arg, "--dev-bind-try") == 0)
             op->flags = ALLOW_NOTEXIST;
 
+          argv += 2;
+          argc -= 2;
+        }
+      else if (strcmp (arg, "--bind-fd") == 0 ||
+               strcmp (arg, "--ro-bind-fd") == 0)
+        {
+          int src_fd;
+          char *endptr;
+
+          if (argc < 3)
+            die ("--bind-fd takes two arguments");
+
+          src_fd = strtol (argv[1], &endptr, 10);
+          if (argv[1][0] == 0 || endptr[0] != 0 || src_fd < 0)
+            die ("Invalid fd: %s", argv[1]);
+
+          if (strcmp(arg, "--ro-bind-fd") == 0)
+            op = setup_op_new (SETUP_RO_BIND_MOUNT);
+          else
+            op = setup_op_new (SETUP_BIND_MOUNT);
+          op->source = xasprintf ("/proc/self/fd/%d", src_fd);
+          op->fd = src_fd;
+          op->dest = argv[2];
+
           argv += 2;
           argc -= 2;
         }
diff --git a/tests/test-run.sh b/tests/test-run.sh
index 6151f1a8..8d063b57 100755
--- a/tests/test-run.sh
+++ b/tests/test-run.sh
@@ -565,4 +565,10 @@ $RUN --argv0 right sh -c 'echo $0' > stdout
 assert_files_equal stdout reference
 echo "ok - environment manipulation"
 
+echo "foobar" > file-data
+$RUN --proc /proc --dev /dev --bind / / --bind-fd 100 /tmp cat /tmp/file-data 100< . > stdout
+assert_file_has_content stdout foobar
+
+echo "ok - bind-fd"
+
 echo "ok - End of test"