File libmount-print-a-blacklist-hint-for-unknown-fil... of Package util-linux-systemd

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File libmount-print-a-blacklist-hint-for-unknown-filesyst.patch of Package util-linux-systemd (Revision 5a50e11a739bebf8068d9b11d29bce2b)

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From 199ae08b4df09ec4ce9d82584664e61bcb7ab91a Mon Sep 17 00:00:00 2001
From: Martin Wilck <mwilck@suse.com>
Date: Fri, 1 Feb 2019 11:36:42 +0100
Subject: [PATCH 1/2] libmount: print a blacklist hint for "unknown filesystem
 type"

SUSE blacklists kernel modules for some old, poorly maintained
file systems by default for security reasons. Provide a hopefully
helpful message to users if mounting a possibly blacklisted file
system fails.

Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 libmount/src/context_mount.c | 41 ++++++++++++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/libmount/src/context_mount.c b/libmount/src/context_mount.c
index f914c9b..a48483f 100644
--- a/libmount/src/context_mount.c
+++ b/libmount/src/context_mount.c
@@ -1423,6 +1423,32 @@ done:
 	return rc;
 }
 
+/*
+ * SUSE blacklists kernel modules for some old, poorly maintained
+ * file systems by default for security reasons.
+ * A set of blacklist files is maintained under /etc/modprobe.d,
+ * in the suse-module-tools package.
+ * Blacklisted file system modules will cause mount(2) to fail
+ * with -ENODEV.
+ * If this happens for one of the blacklisted file systems, provide
+ * a hint to the user where to look.
+ */
+static int is_maybe_blacklisted(const char *fstype)
+{
+	static const char *const fs_blacklist[] = {
+		"adfs", "affs", "bfs", "befs", "cramfs", "efs", "erofs",
+		"exofs", "freevxfs", "f2fs", "hfs", "hpfs", "jffs2",
+		"jfs", "minix", "nilfs2", "ntfs", "omfs", "qnx4", "qnx6",
+		"sysv", "ubifs", "ufs"
+	};
+	size_t i;
+
+	for (i = 0; i < sizeof(fs_blacklist)/sizeof(*fs_blacklist); i++)
+		if (!strcmp(fs_blacklist[i], fstype))
+			return 1;
+	return 0;
+}
+
 int mnt_context_get_mount_excode(
 			struct libmnt_context *cxt,
 			int rc,
@@ -1670,10 +1696,17 @@ int mnt_context_get_mount_excode(
 	case ENODEV:
 		if (!buf)
 			break;
-		if (mnt_context_get_fstype(cxt))
-			snprintf(buf, bufsz, _("unknown filesystem type '%s'"),
-					mnt_context_get_fstype(cxt));
-		else
+		if (mnt_context_get_fstype(cxt)) {
+			size_t n;
+
+			n = snprintf(buf, bufsz,
+				     _("unknown filesystem type '%s'"),
+				     mnt_context_get_fstype(cxt));
+			if (n < bufsz &&
+			    is_maybe_blacklisted(mnt_context_get_fstype(cxt)))
+				snprintf(buf + n, bufsz - n,
+					 " (hint: possibly blacklisted, see mount(8))");
+		} else
 			snprintf(buf, bufsz, _("unknown filesystem type"));
 		break;
 
-- 
2.19.2

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File libmount-print-a-blacklist-hint-for-unknown-filesyst.patch of Package util-linux-systemd (Revision 5a50e11a739bebf8068d9b11d29bce2b)

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