SOURCES/0001-Add-bind-fd-and-ro-bind-fd-to-let-you-bind-a-O_PATH-.patch

@@ -1,128 +0,0 @@
-From 52d5f7c3ba5c8e10b3a992304fd28cd4d18caeeb 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.
-
-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>
-(cherry picked from commit a253257cd298892da43e15201d83f9a02c9b58b5)
-[kalev: Backport to 0.4.x]
-Signed-off-by: Kalev Lember <klember@redhat.com>
----
- bubblewrap.c      | 50 +++++++++++++++++++++++++++++++++++++++++++++++
- tests/test-run.sh |  7 ++++++-
- 2 files changed, 56 insertions(+), 1 deletion(-)
-
-diff --git a/bubblewrap.c b/bubblewrap.c
-index b3d52bc..38b3646 100644
---- a/bubblewrap.c
-+++ b/bubblewrap.c
-@@ -250,6 +250,8 @@ 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"
-@@ -1111,6 +1113,30 @@ setup_newroot (bool unshare_pid,
-                          (op->type == SETUP_RO_BIND_MOUNT ? BIND_READONLY : 0) |
-                          (op->type == SETUP_DEV_BIND_MOUNT ? BIND_DEVICES : 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:
-@@ -1648,6 +1674,30 @@ 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 702c480..ce1eaf6 100755
---- a/tests/test-run.sh
-+++ b/tests/test-run.sh
-@@ -80,7 +80,7 @@ if ! $RUN true; then
-     skip Seems like bwrap is not working at all. Maybe setuid is not working
- fi
- 
--echo "1..49"
-+echo "1..50"
- 
- # Test help
- ${BWRAP} --help > help.txt
-@@ -382,5 +382,10 @@ else
-     echo "ok - Test --pidns"
- fi
- 
-+echo "foobar" > file-data
-+$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"
--- 
-2.46.0
-

SPECS/bubblewrap.spec

@@ -1,13 +1,12 @@
 Name: bubblewrap
 Version: 0.4.0
-Release: 2%{?dist}
+Release: 1%{?dist}
 Summary: Core execution tool for unprivileged containers
 
 License: LGPLv2+
 #VCS: git:https://github.com/projectatomic/bubblewrap
 URL: https://github.com/projectatomic/bubblewrap
 Source0: https://github.com/projectatomic/bubblewrap/releases/download/v%{version}/bubblewrap-%{version}.tar.xz
-Patch0: 0001-Add-bind-fd-and-ro-bind-fd-to-let-you-bind-a-O_PATH-.patch
 
 BuildRequires: autoconf automake libtool
 BuildRequires: gcc
@@ -22,7 +21,7 @@ containers that works as a setuid binary on kernels without
 user namespaces.
 
 %prep
-%autosetup -p1
+%autosetup
 
 %build
 if ! test -x configure; then NOCONFIGURE=1 ./autogen.sh; fi
@@ -46,9 +45,6 @@ find %{buildroot} -name '*.la' -delete -print
 %{_mandir}/man1/*
 
 %changelog
-* Fri Aug 30 2024 Kalev Lember <klember@redhat.com> - 0.4.0-2
-- Backport upstream fix to help address CVE-2024-42472 in flatpak
-
 * Thu Jan 09 2020 David King <dking@redhat.com> - 0.4.0-1
 - Rebase to 0.4.0 (#1788067)