From bc395a979a00bb3e16f3bd92b5b2006db4a5aee3 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Wed, 11 Nov 2020 12:03:07 -0500 Subject: [PATCH 07/18] s390/sclp: rework sclp boundary checks RH-Author: Thomas Huth Message-id: <20201111120316.707489-4-thuth@redhat.com> Patchwork-id: 99500 O-Subject: [RHEL-8.4.0 qemu-kvm PATCH v2 03/12] s390/sclp: rework sclp boundary checks Bugzilla: 1798506 RH-Acked-by: Jens Freimann RH-Acked-by: Cornelia Huck RH-Acked-by: David Hildenbrand From: Collin Walling Rework the SCLP boundary check to account for different SCLP commands (eventually) allowing different boundary sizes. Signed-off-by: Collin Walling Reviewed-by: Cornelia Huck Reviewed-by: Thomas Huth Acked-by: Janosch Frank Reviewed-by: Claudio Imbrenda Message-Id: <20200915194416.107460-3-walling@linux.ibm.com> Signed-off-by: Cornelia Huck (cherry picked from commit db13387ca01a69d870cc16dd232375c2603596f2) Signed-off-by: Thomas Huth Signed-off-by: Danilo C. L. de Paula --- hw/s390x/sclp.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index fe7d0fece80..38278497319 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -49,6 +49,18 @@ static inline bool sclp_command_code_valid(uint32_t code) return false; } +static bool sccb_verify_boundary(uint64_t sccb_addr, uint16_t sccb_len) +{ + uint64_t sccb_max_addr = sccb_addr + sccb_len - 1; + uint64_t sccb_boundary = (sccb_addr & PAGE_MASK) + PAGE_SIZE; + + if (sccb_max_addr < sccb_boundary) { + return true; + } + + return false; +} + static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count) { uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 }; @@ -229,6 +241,11 @@ int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, goto out_write; } + if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb.h.length))) { + work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); + goto out_write; + } + sclp_c->execute(sclp, &work_sccb, code); out_write: s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, @@ -274,7 +291,7 @@ int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code) goto out_write; } - if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) { + if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb.h.length))) { work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); goto out_write; } -- 2.27.0