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From b9b77159567283628645943b5367d39b558e8faa Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Tue, 26 Jan 2021 20:07:59 -0500
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Subject: [PATCH 9/9] block/iscsi:fix heap-buffer-overflow in
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iscsi_aio_ioctl_cb
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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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Message-id: <20210126200759.245891-2-jmaloy@redhat.com>
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Patchwork-id: 100787
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 1/1] block/iscsi:fix heap-buffer-overflow in iscsi_aio_ioctl_cb
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Bugzilla: 1912974
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: Chen Qun <kuhn.chenqun@huawei.com>
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There is an overflow, the source 'datain.data[2]' is 100 bytes,
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but the 'ss' is 252 bytes.This may cause a security issue because
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we can access a lot of unrelated memory data.
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The len for sbp copy data should take the minimum of mx_sb_len and
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sb_len_wr, not the maximum.
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If we use iscsi device for VM backend storage, ASAN show stack:
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READ of size 252 at 0xfffd149dcfc4 thread T0
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#0 0xaaad433d0d34 in __asan_memcpy (aarch64-softmmu/qemu-system-aarch64+0x2cb0d34)
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#1 0xaaad45f9d6d0 in iscsi_aio_ioctl_cb /qemu/block/iscsi.c:996:9
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#2 0xfffd1af0e2dc (/usr/lib64/iscsi/libiscsi.so.8+0xe2dc)
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#3 0xfffd1af0d174 (/usr/lib64/iscsi/libiscsi.so.8+0xd174)
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#4 0xfffd1af19fac (/usr/lib64/iscsi/libiscsi.so.8+0x19fac)
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#5 0xaaad45f9acc8 in iscsi_process_read /qemu/block/iscsi.c:403:5
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#6 0xaaad4623733c in aio_dispatch_handler /qemu/util/aio-posix.c:467:9
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#7 0xaaad4622f350 in aio_dispatch_handlers /qemu/util/aio-posix.c:510:20
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#8 0xaaad4622f350 in aio_dispatch /qemu/util/aio-posix.c:520
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#9 0xaaad46215944 in aio_ctx_dispatch /qemu/util/async.c:298:5
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#10 0xfffd1bed12f4 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x512f4)
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#11 0xaaad46227de0 in glib_pollfds_poll /qemu/util/main-loop.c:219:9
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#12 0xaaad46227de0 in os_host_main_loop_wait /qemu/util/main-loop.c:242
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#13 0xaaad46227de0 in main_loop_wait /qemu/util/main-loop.c:518
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#14 0xaaad43d9d60c in qemu_main_loop /qemu/softmmu/vl.c:1662:9
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#15 0xaaad4607a5b0 in main /qemu/softmmu/main.c:49:5
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#16 0xfffd1a460b9c in __libc_start_main (/lib64/libc.so.6+0x20b9c)
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#17 0xaaad43320740 in _start (aarch64-softmmu/qemu-system-aarch64+0x2c00740)
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0xfffd149dcfc4 is located 0 bytes to the right of 100-byte region [0xfffd149dcf60,0xfffd149dcfc4)
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allocated by thread T0 here:
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#0 0xaaad433d1e70 in __interceptor_malloc (aarch64-softmmu/qemu-system-aarch64+0x2cb1e70)
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#1 0xfffd1af0e254 (/usr/lib64/iscsi/libiscsi.so.8+0xe254)
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#2 0xfffd1af0d174 (/usr/lib64/iscsi/libiscsi.so.8+0xd174)
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#3 0xfffd1af19fac (/usr/lib64/iscsi/libiscsi.so.8+0x19fac)
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#4 0xaaad45f9acc8 in iscsi_process_read /qemu/block/iscsi.c:403:5
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#5 0xaaad4623733c in aio_dispatch_handler /qemu/util/aio-posix.c:467:9
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#6 0xaaad4622f350 in aio_dispatch_handlers /qemu/util/aio-posix.c:510:20
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#7 0xaaad4622f350 in aio_dispatch /qemu/util/aio-posix.c:520
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#8 0xaaad46215944 in aio_ctx_dispatch /qemu/util/async.c:298:5
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#9 0xfffd1bed12f4 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x512f4)
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#10 0xaaad46227de0 in glib_pollfds_poll /qemu/util/main-loop.c:219:9
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#11 0xaaad46227de0 in os_host_main_loop_wait /qemu/util/main-loop.c:242
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#12 0xaaad46227de0 in main_loop_wait /qemu/util/main-loop.c:518
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#13 0xaaad43d9d60c in qemu_main_loop /qemu/softmmu/vl.c:1662:9
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#14 0xaaad4607a5b0 in main /qemu/softmmu/main.c:49:5
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#15 0xfffd1a460b9c in __libc_start_main (/lib64/libc.so.6+0x20b9c)
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#16 0xaaad43320740 in _start (aarch64-softmmu/qemu-system-aarch64+0x2c00740)
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Reported-by: Euler Robot <euler.robot@huawei.com>
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Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: 20200418062602.10776-1-kuhn.chenqun@huawei.com
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from ff0507c239a246fd7215b31c5658fc6a3ee1e4c5)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Jon Maloy <jmaloy.redhat.com>
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---
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block/iscsi.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/block/iscsi.c b/block/iscsi.c
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index 0bea2d3a93..06915655b3 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -991,8 +991,7 @@ iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
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acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
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acb->ioh->sb_len_wr = acb->task->datain.size - 2;
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- ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
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- acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
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+ ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr);
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memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
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}
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--
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2.18.2
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