Andrew Donnellan ajd@linux.ibm.com writes:
Add a special case to block_rtas_call() to allow the ibm,platform-dump RTAS call through the RTAS filter if the buffer address is 0.
According to PAPR, ibm,platform-dump is called with a null buffer address to notify the platform firmware that processing of a particular dump is finished.
Without this, on a pseries machine with CONFIG_PPC_RTAS_FILTER enabled, an application such as rtas_errd that is attempting to retrieve a dump will encounter an error at the end of the retrieval process.
Fixes: bd59380c5ba4 ("powerpc/rtas: Restrict RTAS requests from userspace") Cc: stable@vger.kernel.org Reported-by: Sathvika Vasireddy sathvika@linux.ibm.com Signed-off-by: Andrew Donnellan ajd@linux.ibm.com
I agree this allows ibm,platform-dump to work without weakening the filter for other calls. Thanks.
Reviewed-by: Nathan Lynch nathanl@linux.ibm.com