[PATCH] arm64: mops: Do not dereference src reg for a set operation

[Keir Fraser]

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 to 2de451a329cf662b the code in do_el0_mops() was benign as the
use of pt_regs_read_reg() prevented the out-of-bounds access.

Fixes: 2de451a329cf662b ("KVM: arm64: Add handler for MOPS exceptions")
Cc: Kristina Martsenko <kristina.martsenko at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: stable at vger.kernel.org
Reviewed-by: Marc Zyngier <maz at kernel.org>
Signed-off-by: Keir Fraser <keirf at google.com>
---
 arch/arm64/include/asm/traps.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h
index d780d1bd2eac..82cf1f879c61 100644
--- a/arch/arm64/include/asm/traps.h
+++ b/arch/arm64/include/asm/traps.h
@@ -109,10 +109,9 @@ static inline void arm64_mops_reset_regs(struct user_pt_regs *regs, unsigned lon
 	int dstreg = ESR_ELx_MOPS_ISS_DESTREG(esr);
 	int srcreg = ESR_ELx_MOPS_ISS_SRCREG(esr);
 	int sizereg = ESR_ELx_MOPS_ISS_SIZEREG(esr);
-	unsigned long dst, src, size;
+	unsigned long dst, size;
 
 	dst = regs->regs[dstreg];
-	src = regs->regs[srcreg];
 	size = regs->regs[sizereg];
 
 	/*
@@ -129,6 +128,7 @@ static inline void arm64_mops_reset_regs(struct user_pt_regs *regs, unsigned lon
 		}
 	} else {
 		/* CPY* instruction */
+		unsigned long src = regs->regs[srcreg];
 		if (!(option_a ^ wrong_option)) {
 			/* Format is from Option B */
 			if (regs->pstate & PSR_N_BIT) {
-- 
2.49.0.395.g12beb8f557-goog