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authorRichard W.M. Jones <rjones@redhat.com>2021-11-15 14:29:43 -0600
committerEric Blake <eblake@redhat.com>2021-11-16 10:16:38 -0600
commit3d212b41e9ccb3f37d04f22c59a960bac099c1d4 (patch)
treed9ccd6dedee22d08ae4dec12d09b71b7c2382e5c /meson_options.txt
parent76df2b8d695b07d85cce7db753a51cdbfe42b445 (diff)
nbd/server: Add --selinux-label option
Under SELinux, Unix domain sockets have two labels. One is on the disk and can be set with commands such as chcon(1). There is a different label stored in memory (called the process label). This can only be set by the process creating the socket. When using SELinux + SVirt and wanting qemu to be able to connect to a qemu-nbd instance, you must set both labels correctly first. For qemu-nbd the options to set the second label are awkward. You can create the socket in a wrapper program and then exec into qemu-nbd. Or you could try something with LD_PRELOAD. This commit adds the ability to set the label straightforwardly on the command line, via the new --selinux-label flag. (The name of the flag is the same as the equivalent nbdkit option.) A worked example showing how to use the new option can be found in this bug: https://bugzilla.redhat.com/show_bug.cgi?id=1984938 Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1984938 Signed-off-by: Richard W.M. Jones <rjones@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> [eblake: rebase to configure changes, reject --selinux-label if it is not compiled in or not used on a Unix socket] Note that we may relax some of these restrictions at a later date, such as making it possible to label a TCP socket, although it may be smarter to do so as a generic QMP action rather than more one-off command lines in qemu-nbd. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20211115202944.615966-1-eblake@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> [eblake: adjust meson output as suggested by thuth] Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'meson_options.txt')
-rw-r--r--meson_options.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/meson_options.txt b/meson_options.txt
index 411952bc91..e392323732 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -201,3 +201,6 @@ option('slirp', type: 'combo', value: 'auto',
option('fdt', type: 'combo', value: 'auto',
choices: ['disabled', 'enabled', 'auto', 'system', 'internal'],
description: 'Whether and how to find the libfdt library')
+
+option('selinux', type: 'feature', value: 'auto',
+ description: 'SELinux support in qemu-nbd')