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package/base-files: caldata: use dd iflag fullblock

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This dd flag ensures that the requested size
is retrieved from pipes or special filesystems (if available).

Without this flag, on multi-core systems,
Piped or special filesystem data can be truncated
when a size greater than PIPE_BUF is requested.

Fixes: FS#3494
Fixes: 7557e7f ("package/base-files: caldata: work around dd's
limitation")
Cc: Thibaut VARÈNE <hacks@slashdirt.org>

Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
This commit is contained in:
John Thomson 2020-12-09 13:03:04 +10:00 committed by Petr Štetiar
parent 064d65c2f7
commit d82c191283
2 changed files with 26 additions and 13 deletions
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2
package/base-files/Makefile
View File

@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
include $(INCLUDE_DIR)/feeds.mk
PKG_NAME:=base-files
PKG_RELEASE:=239
PKG_RELEASE:=240
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/

37
package/base-files/files/lib/functions/caldata.sh
View File

@ -3,6 +3,16 @@
. /lib/functions.sh
. /lib/functions/system.sh
caldata_dd() {
local source=$1
local target=$2
local count=$(($3))
local offset=$(($4))
dd if=$source of=$target iflag=skip_bytes,fullblock bs=$count skip=$offset count=1 2>/dev/null
return $?
}
caldata_die() {
echo "caldata: " "$*"
exit 1
@ -17,7 +27,7 @@ caldata_extract() {
mtd=$(find_mtd_chardev $part)
[ -n "$mtd" ] || caldata_die "no mtd device found for partition $part"
dd if=$mtd of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
caldata_dd $mtd /lib/firmware/$FIRMWARE $count $offset || \
caldata_die "failed to extract calibration data from $mtd"
}
@ -34,7 +44,7 @@ caldata_extract_ubi() {
ubi=$(nand_find_volume $ubidev $part)
[ -n "$ubi" ] || caldata_die "no UBI volume found for $part"
dd if=/dev/$ubi of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
caldata_dd /dev/$ubi /lib/firmware/$FIRMWARE $count $offset || \
caldata_die "failed to extract calibration data from $ubi"
}
@ -64,8 +74,7 @@ caldata_from_file() {
[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
# dd doesn't handle partial reads from special files: use cat
cat $source | dd of=$target iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
caldata_dd $source $target $count $offset || \
caldata_die "failed to extract calibration data from $source"
}
@ -73,16 +82,20 @@ caldata_sysfsload_from_file() {
local source=$1
local offset=$(($2))
local count=$(($3))
local target_dir="/sys/$DEVPATH"
local target="$target_dir/data"
# dd doesn't handle partial reads from special files: use cat
# test extract to /dev/null first
cat $source | dd of=/dev/null iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
[ -d "$target_dir" ] || \
caldata_die "no sysfs dir to write: $target"
echo 1 > "$target_dir/loading"
caldata_dd $source $target $count $offset
if [ $? != 0 ]; then
echo 1 > "$target_dir/loading"
caldata_die "failed to extract calibration data from $source"
# can't fail now
echo 1 > /sys/$DEVPATH/loading
cat $source | dd of=/sys/$DEVPATH/data iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null
echo 0 > /sys/$DEVPATH/loading
else
echo 0 > "$target_dir/loading"
fi
}
caldata_valid() {