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a13bfa4fe0
The source register is not used for SET* and reading it can result in a UBSAN out-of-bounds array access error, specifically when the MOPS exception is taken from a SET* sequence with XZR (reg 31) as the source. Architecturally this is the only case where a src/dst/size field in the ESR can be reported as 31. Prior to2de451a329the code in do_el0_mops() was benign as the use of pt_regs_read_reg() prevented the out-of-bounds access. Fixes:2de451a329("KVM: arm64: Add handler for MOPS exceptions") Cc: <stable@vger.kernel.org> # 6.12.x Cc: Kristina Martsenko <kristina.martsenko@arm.com> Cc: Will Deacon <will@kernel.org> Cc: stable@vger.kernel.org Reviewed-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Keir Fraser <keirf@google.com> Reviewed-by: Kristina Martšenko <kristina.martsenko@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20250326110448.3792396-1-keirf@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>