linux-kernel - [PATCH 2/2 v3] initramfs: print error and shell out for unsupported content

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Date:	Sat, 22 Mar 2014 13:29:21 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Levente Kurusa <levex@...ux.com>,
	Alexander Holler <holler@...oftware.de>,
	<stable@...r.kernel.org>
Subject: [PATCH 2/2 v3] initramfs: print error and shell out for unsupported content

The initramfs generation is broken for file and directory names which contain
colons, spaces and other unusual characters. Print an error and don't try to
continue.

Some tests:

cd linux
make defconfig
echo 'CONFIG_BLK_DEV_INITRD=y' >> .config
echo 'CONFIG_INITRAMFS_ROOT_UID=0' >>.config
echo 'CONFIG_INITRAMFS_ROOT_GID=0' >>.config
echo 'CONFIG_INITRAMFS_COMPRESSION_NONE=y' >>.config
echo 'CONFIG_INITRAMFS_SOURCE="/tmp/bugroot"' >>.config

Problem with colons:

mkdir -p /tmp/bugroot/a:b
make -j4 bzImage # no error
make bzImage # try again, oops

Problem with spaces:

mkdir -p /tmp/bugroot/a\ b
make -j4 bzImage # no error
zcat usr/initramfs_data.cpio.gz | cpio --extract --list # oops, no content

Signed-off-by: Alexander Holler <holler@...oftware.de>
Cc: <stable@...r.kernel.org>
---
 Changes in v2, v3: check for \n, \r and \t too, updated error msg.

 scripts/gen_initramfs_list.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
index 17fa901..2c613e7 100644
--- a/scripts/gen_initramfs_list.sh
+++ b/scripts/gen_initramfs_list.sh
@@ -171,6 +171,19 @@ dir_filelist() {
 	${dep_list}header "$1"
 
 	srcdir=$(echo "$1" | sed -e 's://*:/:g')
+
+	# Files and directories with spaces and colons are unsupported.
+	local unsupported=$(find "${srcdir}" -regex '.*\(:\| \|\n\|\r\|\t\).*')
+	if [ ! -z "${unsupported}" ]; then
+		printf "ERROR: Unable to handle files/directories with " >&2
+		printf "unsupported characters (spaces, :, \\\n, \\\r, " >&2
+		printf "\\\t).\n Please use other ways to generate a " >&2
+		printf "cpio-archive with such names.\n" >&2
+		printf "Unsupported files and directories are:\n" >&2
+		printf "$unsupported\n" >&2
+		exit 1
+	fi
+
 	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n")
 
 	# If $dirlist is only one line, then the directory is empty
-- 
1.8.3.1

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