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authorJohn Thomson <git@johnthomson.fastmail.com.au>2020-12-09 13:03:04 +1000
committerPetr Štetiar <ynezz@true.cz>2020-12-11 13:48:24 +0100
commitd82c1912838f262b6f4b9157077f390f5f06b6c4 (patch)
treef39f0cb8e2497835a711b37c7f03e0ca4478ab87 /package/base-files/files/lib/functions
parent064d65c2f76409759ac8d72268f2558c7b55f3b3 (diff)
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package/base-files: caldata: use dd iflag fullblock
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>
Diffstat (limited to 'package/base-files/files/lib/functions')
-rw-r--r--package/base-files/files/lib/functions/caldata.sh37
1 files changed, 25 insertions, 12 deletions
diff --git a/package/base-files/files/lib/functions/caldata.sh b/package/base-files/files/lib/functions/caldata.sh
index e22c7d27e6..2177cf8415 100644
--- a/package/base-files/files/lib/functions/caldata.sh
+++ b/package/base-files/files/lib/functions/caldata.sh
@@ -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 || \
- caldata_die "failed to extract calibration data from $source"
+ [ -d "$target_dir" ] || \
+ caldata_die "no sysfs dir to write: $target"
- # can't fail now
- echo 1 > /sys/$DEVPATH/loading
- cat $source | dd of=/sys/$DEVPATH/data iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null
- echo 0 > /sys/$DEVPATH/loading
+ echo 1 > "$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 $source"
+ else
+ echo 0 > "$target_dir/loading"
+ fi
}
caldata_valid() {