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| author | Andrew Donnellan <ajd@linux.ibm.com> | 2022-06-14 16:49:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-29 10:03:30 +0300 |
| commit | c1cfae46c5dc1d450defc5b31dd8d90ab4f46f8d (patch) | |
| tree | ac0932be89f8903e56f63695b68f0244a8c81544 /arch/powerpc/platforms/powernv/opal-sensor-groups.c | |
| parent | fe643b5afde63936c5ff97806f15d87cae87e8cc (diff) | |
| download | linux-c1cfae46c5dc1d450defc5b31dd8d90ab4f46f8d.tar.xz | |
powerpc/rtas: Allow ibm,platform-dump RTAS call with null buffer address
commit 7bc08056a6dabc3a1442216daf527edf61ac24b6 upstream.
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>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220614134952.156010-1-ajd@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-sensor-groups.c')
0 files changed, 0 insertions, 0 deletions