Validate size for vector operations
Description: Validate size for vector operations
JIRA: https://issues.redhat.com/browse/RHEL-29116
CVE: CVE-2023-52606
Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=60777873
Tested: Verified Brew build test kernel RPMs
Signed-off-by: Mamatha Inamdar minamdar@redhat.com
commit 8f9abaa6d7de0a70fc68acaedce290c1f96e2e59 Author: Naveen N Rao naveen@kernel.org Date: Thu Nov 23 12:47:05 2023 +0530
powerpc/lib: Validate size for vector operations
Some of the fp/vmx code in sstep.c assume a certain maximum size for the
instructions being emulated. The size of those operations however is
determined separately in analyse_instr().
Add a check to validate the assumption on the maximum size of the
operations, so as to prevent any unintended kernel stack corruption.
Signed-off-by: Naveen N Rao <naveen@kernel.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Build-tested-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231123071705.397625-1-naveen@kernel.org
Signed-off-by: Mamatha Inamdar minamdar@redhat.com
Edited by Mamatha Inamdar