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From 6cc7c8dd7a6fac493c648c607bec4c38c0b275b6 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Wed, 11 Nov 2020 12:03:09 -0500
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Subject: [PATCH 09/18] s390/sclp: check sccb len before filling in data
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <20201111120316.707489-6-thuth@redhat.com>
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Patchwork-id: 99502
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH v2 05/12] s390/sclp: check sccb len before filling in data
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Bugzilla: 1798506
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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From: Collin Walling <walling@linux.ibm.com>
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The SCCB must be checked for a sufficient length before it is filled
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with any data. If the length is insufficient, then the SCLP command
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is suppressed and the proper response code is set in the SCCB header.
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While we're at it, let's cleanup the length check by placing the
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calculation inside a macro.
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Fixes: 832be0d8a3bb ("s390x: sclp: Report insufficient SCCB length")
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Signed-off-by: Collin Walling <walling@linux.ibm.com>
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Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
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Message-Id: <20200915194416.107460-5-walling@linux.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 0260b97824495ebfacfa8bbae0be10b0ef986bf6)
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/s390x/sclp.c | 26 ++++++++++++++------------
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1 file changed, 14 insertions(+), 12 deletions(-)
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diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
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index cf1292beb22..2b4c6c5cfad 100644
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--- a/hw/s390x/sclp.c
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+++ b/hw/s390x/sclp.c
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@@ -78,6 +78,8 @@ static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count)
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}
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}
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+#define SCCB_REQ_LEN(s, max_cpus) (sizeof(s) + max_cpus * sizeof(CPUEntry))
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+
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/* Provide information about the configuration, CPUs and storage */
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static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
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{
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@@ -86,6 +88,12 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
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int cpu_count;
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int rnsize, rnmax;
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IplParameterBlock *ipib = s390_ipl_get_iplb();
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+ int required_len = SCCB_REQ_LEN(ReadInfo, machine->possible_cpus->len);
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+
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+ if (be16_to_cpu(sccb->h.length) < required_len) {
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+ sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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+ return;
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+ }
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/* CPU information */
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prepare_cpu_entries(machine, read_info->entries, &cpu_count);
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@@ -95,12 +103,6 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
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read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
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- if (be16_to_cpu(sccb->h.length) <
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- (sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) {
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- sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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- return;
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- }
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-
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/* Configuration Characteristic (Extension) */
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s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
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read_info->conf_char);
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@@ -146,18 +148,18 @@ static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
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MachineState *machine = MACHINE(qdev_get_machine());
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ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
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int cpu_count;
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+ int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len);
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+
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+ if (be16_to_cpu(sccb->h.length) < required_len) {
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+ sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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+ return;
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+ }
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prepare_cpu_entries(machine, cpu_info->entries, &cpu_count);
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cpu_info->nr_configured = cpu_to_be16(cpu_count);
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cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
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cpu_info->nr_standby = cpu_to_be16(0);
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- if (be16_to_cpu(sccb->h.length) <
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- (sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) {
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- sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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- return;
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- }
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-
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/* The standby offset is 16-byte for each CPU */
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cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
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+ cpu_info->nr_configured*sizeof(CPUEntry));
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--
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2.27.0
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