From 05ff2fb80ce4ca85d8a39d48ff8156de739b4f51 Mon Sep 17 00:00:00 2001 From: Simon Veith Date: Fri, 20 Dec 2019 14:03:00 +0000 Subject: hw/arm/smmuv3: Check stream IDs against actual table LOG2SIZE When checking whether a stream ID is in range of the stream table, we have so far been only checking it against our implementation limit (SMMU_IDR1_SIDSIZE). However, the guest can program the STRTAB_BASE_CFG.LOG2SIZE field to a size that is smaller than this limit. Check the stream ID against this limit as well to match the hardware behavior of raising C_BAD_STREAMID events in case the limit is exceeded. Also, ensure that we do not go one entry beyond the end of the table by checking that its index is strictly smaller than the table size. ref. ARM IHI 0070C, section 6.3.24. Signed-off-by: Simon Veith Acked-by: Eric Auger Tested-by: Eric Auger Message-id: 1576509312-13083-4-git-send-email-sveith@amazon.de Cc: Eric Auger Cc: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- hw/arm/smmuv3.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c index eef9a18..727558b 100644 --- a/hw/arm/smmuv3.c +++ b/hw/arm/smmuv3.c @@ -377,11 +377,15 @@ static int smmu_find_ste(SMMUv3State *s, uint32_t sid, STE *ste, SMMUEventInfo *event) { dma_addr_t addr; + uint32_t log2size; int ret; trace_smmuv3_find_ste(sid, s->features, s->sid_split); - /* Check SID range */ - if (sid > (1 << SMMU_IDR1_SIDSIZE)) { + log2size = FIELD_EX32(s->strtab_base_cfg, STRTAB_BASE_CFG, LOG2SIZE); + /* + * Check SID range against both guest-configured and implementation limits + */ + if (sid >= (1 << MIN(log2size, SMMU_IDR1_SIDSIZE))) { event->type = SMMU_EVT_C_BAD_STREAMID; return -EINVAL; } -- cgit v1.1