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netboot: Clear kernel cmdline data before writing new parmfile

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If this isn't cleared first it can end up with an unexpected cmdline if
it doesn't completely overwrite the default data.

Closes: https://github.com/ibm-s390-tools/s390-tools/pull/95
Reviewed-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Brian C. Lane
2020-10-27 16:04:03 -07:00
committed by Jan Höppner
parent 313092b202
commit 702dc96264
1 changed files with 3 additions and 0 deletions
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3
netboot/mk-s390image
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@@ -129,6 +129,9 @@ dobuild()
parmfile_size=$(du -b $parmfile | cut -f1)
if [ $parmfile_size -le $MAX_PARMFILE_SIZE ]
then
# Clear any previous parameters
dd seek=$OFFS_COMMANDLINE_BYTES bs=1 count=$MAX_PARMFILE_SIZE \
if=/dev/zero of=$image conv=notrunc status=none
dd seek=$OFFS_COMMANDLINE_BYTES bs=1 if=$parmfile \
of=$image conv=notrunc status=none
else