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libpriv/kernel: add cap_mknod to dracut run

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A lot of history with this. But essentially, dracut tries to `mknod` a
few character devices like `/dev/random` and `/dev/urandom` and fails.

We originally blocked `cap_mknod` because, well, `%post` scripts don't
really need to do that, and it would get wiped anyway. But there is a
use case for dracut's CPIO: we want `/dev/*random` to be available in
early boot *before* systemd even mounts `devtmpfs` because libgcrypt as
part of its constructor-time selftests in FIPS mode wants to read from
there.

For more fun, see:
https://bugzilla.redhat.com/show_bug.cgi?id=1778940
https://bugzilla.redhat.com/show_bug.cgi?id=1401444
https://bugzilla.redhat.com/show_bug.cgi?id=1380866
This commit is contained in:
Jonathan Lebon 2019-12-03 21:36:40 -05:00 committed by OpenShift Merge Robot
parent 2589cd1f92
commit 3b8a1ec6c4
1 changed files with 6 additions and 0 deletions
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6
src/libpriv/rpmostree-kernel.c
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@ -564,6 +564,12 @@ rpmostree_run_dracut (int rootfs_dfd,
rpmostree_bwrap_bind_read (bwrap, "usr", "/usr");
}
/* Need to let dracut create devices like /dev/urandom:
* https://bugzilla.redhat.com/show_bug.cgi?id=1778940
* https://bugzilla.redhat.com/show_bug.cgi?id=1401444
* https://bugzilla.redhat.com/show_bug.cgi?id=1380866 */
rpmostree_bwrap_append_bwrap_argv (bwrap, "--cap-add", "cap_mknod", NULL);
if (dracut_host_tmpdir)
rpmostree_bwrap_bind_readwrite (bwrap, dracut_host_tmpdir->path, "/tmp/dracut");