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From 60b05771b8afc08e0ca9956658d2c55cd1739652 Mon Sep 17 00:00:00 2001
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From: Mauro Matteo Cascella <mcascell@redhat.com>
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Date: Thu, 4 Nov 2021 17:31:38 +0100
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Subject: [PATCH 1/2] hw/scsi/scsi-disk: MODE_PAGE_ALLS not allowed in MODE
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SELECT commands
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 70: hw/scsi/scsi-disk: MODE_PAGE_ALLS not allowed in MODE SELECT commands
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RH-Commit: [1/1] bd3de8bdf48aa6c522612505d08c23dafb122a34 (jmaloy/qemu-kvm)
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RH-Bugzilla: 2025605
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RH-Acked-by: Paolo Bonzini <None>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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This avoids an off-by-one read of 'mode_sense_valid' buffer in
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hw/scsi/scsi-disk.c:mode_sense_page().
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Fixes: CVE-2021-3930
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Cc: qemu-stable@nongnu.org
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Reported-by: Alexander Bulekov <alxndr@bu.edu>
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Fixes: a8f4bbe2900 ("scsi-disk: store valid mode pages in a table")
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Fixes: #546
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Reported-by: Qiuhao Li <Qiuhao.Li@outlook.com>
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Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit b3af7fdf9cc537f8f0dd3e2423d83f5c99a457e8)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/scsi/scsi-disk.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
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index 5cb5fd35bd..1d0ea72289 100644
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--- a/hw/scsi/scsi-disk.c
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+++ b/hw/scsi/scsi-disk.c
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@@ -1086,6 +1086,7 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
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uint8_t *p = *p_outbuf + 2;
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int length;
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+ assert(page < ARRAY_SIZE(mode_sense_valid));
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if ((mode_sense_valid[page] & (1 << s->qdev.type)) == 0) {
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return -1;
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}
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@@ -1427,6 +1428,11 @@ static int scsi_disk_check_mode_select(SCSIDiskState *s, int page,
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return -1;
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}
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+ /* MODE_PAGE_ALLS is only valid for MODE SENSE commands */
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+ if (page == MODE_PAGE_ALLS) {
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+ return -1;
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+ }
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+
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p = mode_current;
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memset(mode_current, 0, inlen + 2);
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len = mode_sense_page(s, page, &p, 0);
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--
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2.27.0
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