135aa3ba7e
This patch fixes two issues with the current get_partitions()
function.
First: "Invalid partition table on $disk" will pop up on
legitimate images on big endian system.
This is because the little-endian representation of "55 AA" is
assumed in the context of little-endian architectures. On these
comparing it to the 16-bit word 0xAA55 does work as intented.
Whereas on big-endian systems, this would have to be 0x55AA.
This patch fixes the issue by replacing the integer conversion
and value match check with just a string comparision.
Second: The extraction of the type, start LBA and LBA num from
the partition table has the same endianness issue. This has been
fixed by using the new hex_le32_to_cpu() function. This function
will translate the stored little-endian data to the correct
byte-order if necessary.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
(cherry picked from commit 4e3f6dae04)
353 lines
8.1 KiB
Bash
353 lines
8.1 KiB
Bash
#!/bin/sh
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RAM_ROOT=/tmp/root
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[ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
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libs() { ldd $* 2>/dev/null | sed -r 's/(.* => )?(.*) .*/\2/'; }
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install_file() { # <file> [ <file> ... ]
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for file in "$@"; do
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dest="$RAM_ROOT/$file"
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[ -f $file -a ! -f $dest ] && {
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dir="$(dirname $dest)"
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mkdir -p "$dir"
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cp $file $dest
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}
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done
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}
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install_bin() { # <file> [ <symlink> ... ]
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src=$1
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files=$1
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[ -x "$src" ] && files="$src $(libs $src)"
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install_file $files
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shift
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for link in "$@"; do {
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dest="$RAM_ROOT/$link"
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dir="$(dirname $dest)"
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mkdir -p "$dir"
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[ -f "$dest" ] || ln -s $src $dest
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}; done
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}
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supivot() { # <new_root> <old_root>
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/bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
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mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
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/bin/mount -o noatime,move /proc $1/proc && \
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pivot_root $1 $1$2 || {
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/bin/umount -l $1 $1
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return 1
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}
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/bin/mount -o noatime,move $2/sys /sys
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/bin/mount -o noatime,move $2/dev /dev
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/bin/mount -o noatime,move $2/tmp /tmp
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/bin/mount -o noatime,move $2/overlay /overlay 2>&-
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return 0
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}
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run_ramfs() { # <command> [...]
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install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount \
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/sbin/pivot_root /sbin/reboot /bin/sync /bin/dd /bin/grep \
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/bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" /bin/dd \
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/bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump \
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/bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc \
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/bin/cut /usr/bin/printf /bin/sync /bin/mkdir /bin/rmdir \
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/bin/rm /usr/bin/basename /bin/kill /bin/chmod /usr/bin/find \
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/bin/mknod
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install_bin /bin/uclient-fetch /bin/wget
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install_bin /sbin/mtd
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install_bin /sbin/mount_root
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install_bin /sbin/snapshot
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install_bin /sbin/snapshot_tool
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install_bin /usr/sbin/ubiupdatevol
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install_bin /usr/sbin/ubiattach
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install_bin /usr/sbin/ubiblock
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install_bin /usr/sbin/ubiformat
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install_bin /usr/sbin/ubidetach
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install_bin /usr/sbin/ubirsvol
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install_bin /usr/sbin/ubirmvol
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install_bin /usr/sbin/ubimkvol
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install_bin /usr/sbin/partx
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install_bin /usr/sbin/losetup
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install_bin /usr/sbin/mkfs.ext4
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for file in $RAMFS_COPY_BIN; do
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install_bin ${file//:/ }
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done
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install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
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[ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
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supivot $RAM_ROOT /mnt || {
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echo "Failed to switch over to ramfs. Please reboot."
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exit 1
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}
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/bin/mount -o remount,ro /mnt
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/bin/umount -l /mnt
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grep /overlay /proc/mounts > /dev/null && {
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/bin/mount -o noatime,remount,ro /overlay
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/bin/umount -l /overlay
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}
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# spawn a new shell from ramdisk to reduce the probability of cache issues
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exec /bin/busybox ash -c "$*"
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}
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kill_remaining() { # [ <signal> ]
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local sig="${1:-TERM}"
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echo -n "Sending $sig to remaining processes ... "
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local my_pid=$$
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local my_ppid=$(cut -d' ' -f4 /proc/$my_pid/stat)
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local my_ppisupgraded=
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grep -q upgraded /proc/$my_ppid/cmdline >/dev/null && {
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local my_ppisupgraded=1
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}
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local stat
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for stat in /proc/[0-9]*/stat; do
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[ -f "$stat" ] || continue
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local pid name state ppid rest
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read pid name state ppid rest < $stat
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name="${name#(}"; name="${name%)}"
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local cmdline
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read cmdline < /proc/$pid/cmdline
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# Skip kernel threads
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[ -n "$cmdline" ] || continue
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if [ $$ -eq 1 ] || [ $my_ppid -eq 1 ] && [ -n "$my_ppisupgraded" ]; then
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# Running as init process, kill everything except me
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if [ $pid -ne $$ ] && [ $pid -ne $my_ppid ]; then
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echo -n "$name "
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kill -$sig $pid 2>/dev/null
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fi
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else
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case "$name" in
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# Skip essential services
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*procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*|*relayd*) : ;;
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# Killable process
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*)
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if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
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echo -n "$name "
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kill -$sig $pid 2>/dev/null
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fi
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;;
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esac
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fi
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done
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echo ""
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}
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run_hooks() {
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local arg="$1"; shift
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for func in "$@"; do
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eval "$func $arg"
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done
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}
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ask_bool() {
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local default="$1"; shift;
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local answer="$default"
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[ "$INTERACTIVE" -eq 1 ] && {
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case "$default" in
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0) echo -n "$* (y/N): ";;
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*) echo -n "$* (Y/n): ";;
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esac
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read answer
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case "$answer" in
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y*) answer=1;;
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n*) answer=0;;
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*) answer="$default";;
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esac
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}
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[ "$answer" -gt 0 ]
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}
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v() {
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[ "$VERBOSE" -ge 1 ] && echo "$@"
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}
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rootfs_type() {
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/bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
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}
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get_image() { # <source> [ <command> ]
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local from="$1"
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local conc="$2"
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local cmd
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case "$from" in
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http://*|ftp://*) cmd="wget -O- -q";;
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*) cmd="cat";;
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esac
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if [ -z "$conc" ]; then
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local magic="$(eval $cmd \"$from\" 2>/dev/null | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
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case "$magic" in
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1f8b) conc="zcat";;
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425a) conc="bzcat";;
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esac
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fi
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eval "$cmd \"$from\" 2>/dev/null ${conc:+| $conc}"
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}
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get_magic_word() {
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(get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
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}
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get_magic_long() {
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(get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
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}
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export_bootdevice() {
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local cmdline uuid disk uevent
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local MAJOR MINOR DEVNAME DEVTYPE
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if read cmdline < /proc/cmdline; then
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case "$cmdline" in
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*block2mtd=*)
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disk="${cmdline##*block2mtd=}"
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disk="${disk%%,*}"
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;;
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*root=*)
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disk="${cmdline##*root=}"
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disk="${disk%% *}"
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;;
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esac
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case "$disk" in
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PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02)
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uuid="${disk#PARTUUID=}"
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uuid="${uuid%-02}"
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for disk in $(find /dev -type b); do
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set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
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if [ "$4$3$2$1" = "$uuid" ]; then
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uevent="/sys/class/block/${disk##*/}/uevent"
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break
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fi
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done
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;;
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/dev/*)
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uevent="/sys/class/block/${disk##*/}/uevent"
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;;
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esac
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if [ -e "$uevent" ]; then
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. "$uevent"
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export BOOTDEV_MAJOR=$MAJOR
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export BOOTDEV_MINOR=$MINOR
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return 0
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fi
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fi
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return 1
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}
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export_partdevice() {
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local var="$1" offset="$2"
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local uevent MAJOR MINOR DEVNAME DEVTYPE
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for uevent in /sys/class/block/*/uevent; do
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. "$uevent"
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if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
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export "$var=$DEVNAME"
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return 0
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fi
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done
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return 1
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}
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hex_le32_to_cpu() {
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[ "$(echo 01 | hexdump -v -n 2 -e '/2 "%x"')" == "3031" ] && {
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echo "${1:0:2}${1:8:2}${1:6:2}${1:4:2}${1:2:2}"
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return
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}
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echo "$@"
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}
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get_partitions() { # <device> <filename>
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local disk="$1"
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local filename="$2"
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if [ -b "$disk" -o -f "$disk" ]; then
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v "Reading partition table from $filename..."
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local magic=$(dd if="$disk" bs=2 count=1 skip=255 2>/dev/null)
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if [ "$magic" != $'\x55\xAA' ]; then
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v "Invalid partition table on $disk"
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exit
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fi
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rm -f "/tmp/partmap.$filename"
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local part
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for part in 1 2 3 4; do
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set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
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local type="$(( $(hex_le32_to_cpu $1) % 256))"
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local lba="$(( $(hex_le32_to_cpu $2) ))"
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local num="$(( $(hex_le32_to_cpu $3) ))"
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[ $type -gt 0 ] || continue
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printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
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done
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fi
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}
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jffs2_copy_config() {
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if grep rootfs_data /proc/mtd >/dev/null; then
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# squashfs+jffs2
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mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
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else
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# jffs2
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mtd jffs2write "$CONF_TAR" rootfs
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fi
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}
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# Flash firmware to MTD partition
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#
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# $(1): path to image
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# $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
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default_do_upgrade() {
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sync
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if [ "$SAVE_CONFIG" -eq 1 ]; then
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get_image "$1" "$2" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
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else
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get_image "$1" "$2" | mtd write - "${PART_NAME:-image}"
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fi
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}
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do_upgrade() {
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v "Performing system upgrade..."
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if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
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platform_do_upgrade "$ARGV"
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else
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default_do_upgrade "$ARGV"
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fi
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if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
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platform_copy_config
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fi
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v "Upgrade completed"
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[ -n "$DELAY" ] && sleep "$DELAY"
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ask_bool 1 "Reboot" && {
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v "Rebooting system..."
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umount -a
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reboot -f
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sleep 5
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echo b 2>/dev/null >/proc/sysrq-trigger
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}
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}
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