Marc Hartmayer 128e5f86fe netboot: Add longer kernel command lines support ...

Since Linux commit 5ecb2da660ab ("s390: support command lines longer
than 896 bytes") the s390x kernel supports longer command lines than 896
bytes. The indication of the maximum size is stored in a new field at
address 0x10430, older kernels without the support store a value of 0
there so in that case fallback to the old maximum length of 896.

In addition, use the checked size as limit to copy in the 'dd' call.
This prevents Linux kernel corruption in case the parmline has changed
in between.

Fixes: https://github.com/ibm-s390-linux/s390-tools/issues/194
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2025-12-01 13:45:36 +01:00

4.6 KiB

Executable File

Raw Blame History

View Raw