From 90bb6d676489b5cc063858ece263e1586795803f Mon Sep 17 00:00:00 2001 From: Frederic Konrad Date: Fri, 24 Nov 2023 14:35:03 +0000 Subject: [PATCH] hw/ssi/xilinx_spips: fix an out of bound access The spips, qspips, and zynqmp-qspips share the same realize function (xilinx_spips_realize) and initialize their io memory region with different mmio_ops passed through the class. The size of the memory region is set to the largest area (0x200 bytes for zynqmp-qspips) thus it is possible to write out of s->regs[addr] in xilinx_spips_write for spips and qspips. This fixes that wrong behavior. Reviewed-by: Luc Michel Signed-off-by: Frederic Konrad Reviewed-by: Francisco Iglesias Message-id: 20231124143505.1493184-2-fkonrad@amd.com Signed-off-by: Peter Maydell --- hw/ssi/xilinx_spips.c | 7 ++++++- include/hw/ssi/xilinx_spips.h | 3 +++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c index a3955c6c50..0bdfad7e2e 100644 --- a/hw/ssi/xilinx_spips.c +++ b/hw/ssi/xilinx_spips.c @@ -973,6 +973,8 @@ static void xilinx_spips_write(void *opaque, hwaddr addr, DB_PRINT_L(0, "addr=" HWADDR_FMT_plx " = %x\n", addr, (unsigned)value); addr >>= 2; + assert(addr < XLNX_SPIPS_R_MAX); + switch (addr) { case R_CONFIG: mask = ~(R_CONFIG_RSVD | MAN_START_COM); @@ -1299,7 +1301,7 @@ static void xilinx_spips_realize(DeviceState *dev, Error **errp) } memory_region_init_io(&s->iomem, OBJECT(s), xsc->reg_ops, s, - "spi", XLNX_ZYNQMP_SPIPS_R_MAX * 4); + "spi", xsc->reg_size); sysbus_init_mmio(sbd, &s->iomem); s->irqline = -1; @@ -1435,6 +1437,7 @@ static void xilinx_qspips_class_init(ObjectClass *klass, void * data) dc->realize = xilinx_qspips_realize; xsc->reg_ops = &qspips_ops; + xsc->reg_size = XLNX_SPIPS_R_MAX * 4; xsc->rx_fifo_size = RXFF_A_Q; xsc->tx_fifo_size = TXFF_A_Q; } @@ -1450,6 +1453,7 @@ static void xilinx_spips_class_init(ObjectClass *klass, void *data) dc->vmsd = &vmstate_xilinx_spips; xsc->reg_ops = &spips_ops; + xsc->reg_size = XLNX_SPIPS_R_MAX * 4; xsc->rx_fifo_size = RXFF_A; xsc->tx_fifo_size = TXFF_A; } @@ -1464,6 +1468,7 @@ static void xlnx_zynqmp_qspips_class_init(ObjectClass *klass, void * data) dc->vmsd = &vmstate_xlnx_zynqmp_qspips; device_class_set_props(dc, xilinx_zynqmp_qspips_properties); xsc->reg_ops = &xlnx_zynqmp_qspips_ops; + xsc->reg_size = XLNX_ZYNQMP_SPIPS_R_MAX * 4; xsc->rx_fifo_size = RXFF_A_Q; xsc->tx_fifo_size = TXFF_A_Q; } diff --git a/include/hw/ssi/xilinx_spips.h b/include/hw/ssi/xilinx_spips.h index 1386d5ac8f..7a754bf67a 100644 --- a/include/hw/ssi/xilinx_spips.h +++ b/include/hw/ssi/xilinx_spips.h @@ -33,7 +33,9 @@ typedef struct XilinxSPIPS XilinxSPIPS; +/* For SPIPS, QSPIPS. */ #define XLNX_SPIPS_R_MAX (0x100 / 4) +/* For ZYNQMP_QSPIPS. */ #define XLNX_ZYNQMP_SPIPS_R_MAX (0x200 / 4) /* Bite off 4k chunks at a time */ @@ -125,6 +127,7 @@ struct XilinxSPIPSClass { SysBusDeviceClass parent_class; const MemoryRegionOps *reg_ops; + uint64_t reg_size; uint32_t rx_fifo_size; uint32_t tx_fifo_size;