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From 194a48aef32367c45c555a4d93fb1a3375b0dead Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Fri, 19 May 2023 16:08:47 +0200
Subject: [PATCH] update common submodule
Laszlo Ersek (2):
options/keys: key_store_import_key(): un-constify "key" parameter
options/keys: introduce unescape_device_mapper_lvm()
Richard W.M. Jones (1):
mlcustomize/SELinux_relabel.ml: Use Array.mem
Roman Kagan (1):
mlcustomize: skip SELinux relabeling if it's disabled
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2168506
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20230519140849.310774-2-lersek@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
(cherry picked from commit 83afd6d3d2c82ee3a8f22079ba12ef7eac38ac34)
---
common | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Submodule common 70c10a07..b636c3f2:
diff --git a/common/mlcustomize/SELinux_relabel.ml b/common/mlcustomize/SELinux_relabel.ml
index 5ecf7bd7..2f3a09bf 100644
--- a/common/mlcustomize/SELinux_relabel.ml
+++ b/common/mlcustomize/SELinux_relabel.ml
@@ -24,10 +24,6 @@ open Printf
module G = Guestfs
-(* Simple reimplementation of Array.mem, available only with OCaml >= 4.03. *)
-let array_find a l =
- List.mem a (Array.to_list l)
-
let rec relabel (g : G.guestfs) =
(* Is the guest using SELinux? (Otherwise this is a no-op). *)
if is_selinux_guest g then (
@@ -59,14 +55,24 @@ and use_setfiles g =
g#aug_load ();
debug_augeas_errors g;
+ let config_path = "/files/etc/selinux/config" in
+ let config_keys = g#aug_ls config_path in
+ (* SELinux may be disabled via a setting in config file *)
+ let selinux_disabled =
+ let selinuxmode_path = config_path ^ "/SELINUX" in
+ if Array.mem selinuxmode_path config_keys then
+ g#aug_get selinuxmode_path = "disabled"
+ else
+ false in
+ if selinux_disabled then
+ failwith "selinux disabled";
+
(* Get the SELinux policy name, eg. "targeted", "minimum".
* Use "targeted" if not specified, just like libselinux does.
*)
let policy =
- let config_path = "/files/etc/selinux/config" in
let selinuxtype_path = config_path ^ "/SELINUXTYPE" in
- let keys = g#aug_ls config_path in
- if array_find selinuxtype_path keys then
+ if Array.mem selinuxtype_path config_keys then
g#aug_get selinuxtype_path
else
"targeted" in
diff --git a/common/options/keys.c b/common/options/keys.c
index 48f1bc7c..52b27369 100644
--- a/common/options/keys.c
+++ b/common/options/keys.c
@@ -260,8 +260,107 @@ key_store_add_from_selector (struct key_store *ks, const char *selector)
return key_store_import_key (ks, &key);
}
+/* Turn /dev/mapper/VG-LV into /dev/VG/LV, in-place. */
+static void
+unescape_device_mapper_lvm (char *id)
+{
+ static const char dev[] = "/dev/", dev_mapper[] = "/dev/mapper/";
+ const char *input_start;
+ char *output;
+ enum { M_SCAN, M_FILL, M_DONE } mode;
+
+ if (!STRPREFIX (id, dev_mapper))
+ return;
+
+ /* Start parsing "VG-LV" from "id" after "/dev/mapper/". */
+ input_start = id + (sizeof dev_mapper - 1);
+
+ /* Start writing the unescaped "VG/LV" output after "/dev/". */
+ output = id + (sizeof dev - 1);
+
+ for (mode = M_SCAN; mode < M_DONE; ++mode) {
+ char c;
+ const char *input = input_start;
+ const char *hyphen_buffered = NULL;
+ bool single_hyphen_seen = false;
+
+ do {
+ c = *input;
+
+ switch (c) {
+ case '-':
+ if (hyphen_buffered == NULL)
+ /* This hyphen may start an escaped hyphen, or it could be the
+ * separator in VG-LV.
+ */
+ hyphen_buffered = input;
+ else {
+ /* This hyphen completes an escaped hyphen; unescape it. */
+ if (mode == M_FILL)
+ *output++ = '-';
+ hyphen_buffered = NULL;
+ }
+ break;
+
+ case '/':
+ /* Slash characters are forbidden in VG-LV anywhere. If there's any,
+ * we'll find it in the first (i.e., scanning) phase, before we output
+ * anything back to "id".
+ */
+ assert (mode == M_SCAN);
+ return;
+
+ default:
+ /* Encountered a non-slash, non-hyphen character -- which also may be
+ * the terminating NUL.
+ */
+ if (hyphen_buffered != NULL) {
+ /* The non-hyphen character comes after a buffered hyphen, so the
+ * buffered hyphen is supposed to be the single hyphen that separates
+ * VG from LV in VG-LV. There are three requirements for this
+ * separator: (a) it must be unique (we must not have seen another
+ * such separator earlier), (b) it must not be at the start of VG-LV
+ * (because VG would be empty that way), (c) it must not be at the end
+ * of VG-LV (because LV would be empty that way). Should any of these
+ * be violated, we'll catch that during the first (i.e., scanning)
+ * phase, before modifying "id".
+ */
+ if (single_hyphen_seen || hyphen_buffered == input_start ||
+ c == '\0') {
+ assert (mode == M_SCAN);
+ return;
+ }
+
+ /* Translate the separator hyphen to a slash character. */
+ if (mode == M_FILL)
+ *output++ = '/';
+ hyphen_buffered = NULL;
+ single_hyphen_seen = true;
+ }
+
+ /* Output the non-hyphen character (including the terminating NUL)
+ * regardless of whether there was a buffered hyphen separator (which,
+ * by now, we'll have attempted to translate and flush).
+ */
+ if (mode == M_FILL)
+ *output++ = c;
+ }
+
+ ++input;
+ } while (c != '\0');
+
+ /* We must have seen the VG-LV separator. If that's not the case, we'll
+ * catch it before modifying "id".
+ */
+ if (!single_hyphen_seen) {
+ assert (mode == M_SCAN);
+ return;
+ }
+ }
+}
+
struct key_store *
-key_store_import_key (struct key_store *ks, const struct key_store_key *key)
+key_store_import_key (struct key_store *ks, struct key_store_key *key)
{
struct key_store_key *new_keys;
@@ -278,6 +377,7 @@ key_store_import_key (struct key_store *ks, const struct key_store_key *key)
error (EXIT_FAILURE, errno, "realloc");
ks->keys = new_keys;
+ unescape_device_mapper_lvm (key->id);
ks->keys[ks->nr_keys] = *key;
++ks->nr_keys;
diff --git a/common/options/options.h b/common/options/options.h
index 94573ee0..94e8b9ee 100644
--- a/common/options/options.h
+++ b/common/options/options.h
@@ -169,7 +169,8 @@ extern struct matching_key *get_keys (struct key_store *ks, const char *device,
const char *uuid, size_t *nr_matches);
extern void free_keys (struct matching_key *keys, size_t nr_matches);
extern struct key_store *key_store_add_from_selector (struct key_store *ks, const char *selector);
-extern struct key_store *key_store_import_key (struct key_store *ks, const struct key_store_key *key);
+extern struct key_store *key_store_import_key (struct key_store *ks,
+ struct key_store_key *key);
extern bool key_store_requires_network (const struct key_store *ks);
extern void free_key_store (struct key_store *ks);
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