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block/iscsi:fix heap-buffer-overflow in iscsi_aio_ioctl_cb
There is an overflow, the source 'datain.data[2]' is 100 bytes, but the 'ss' is 252 bytes.This may cause a security issue because we can access a lot of unrelated memory data. The len for sbp copy data should take the minimum of mx_sb_len and sb_len_wr, not the maximum. If we use iscsi device for VM backend storage, ASAN show stack: READ of size 252 at 0xfffd149dcfc4 thread T0 #0 0xaaad433d0d34 in __asan_memcpy (aarch64-softmmu/qemu-system-aarch64+0x2cb0d34) #1 0xaaad45f9d6d0 in iscsi_aio_ioctl_cb /qemu/block/iscsi.c:996:9 #2 0xfffd1af0e2dc (/usr/lib64/iscsi/libiscsi.so.8+0xe2dc) #3 0xfffd1af0d174 (/usr/lib64/iscsi/libiscsi.so.8+0xd174) #4 0xfffd1af19fac (/usr/lib64/iscsi/libiscsi.so.8+0x19fac) qemu#5 0xaaad45f9acc8 in iscsi_process_read /qemu/block/iscsi.c:403:5 qemu#6 0xaaad4623733c in aio_dispatch_handler /qemu/util/aio-posix.c:467:9 qemu#7 0xaaad4622f350 in aio_dispatch_handlers /qemu/util/aio-posix.c:510:20 qemu#8 0xaaad4622f350 in aio_dispatch /qemu/util/aio-posix.c:520 qemu#9 0xaaad46215944 in aio_ctx_dispatch /qemu/util/async.c:298:5 qemu#10 0xfffd1bed12f4 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x512f4) qemu#11 0xaaad46227de0 in glib_pollfds_poll /qemu/util/main-loop.c:219:9 qemu#12 0xaaad46227de0 in os_host_main_loop_wait /qemu/util/main-loop.c:242 qemu#13 0xaaad46227de0 in main_loop_wait /qemu/util/main-loop.c:518 qemu#14 0xaaad43d9d60c in qemu_main_loop /qemu/softmmu/vl.c:1662:9 qemu#15 0xaaad4607a5b0 in main /qemu/softmmu/main.c:49:5 qemu#16 0xfffd1a460b9c in __libc_start_main (/lib64/libc.so.6+0x20b9c) qemu#17 0xaaad43320740 in _start (aarch64-softmmu/qemu-system-aarch64+0x2c00740) 0xfffd149dcfc4 is located 0 bytes to the right of 100-byte region [0xfffd149dcf60,0xfffd149dcfc4) allocated by thread T0 here: #0 0xaaad433d1e70 in __interceptor_malloc (aarch64-softmmu/qemu-system-aarch64+0x2cb1e70) #1 0xfffd1af0e254 (/usr/lib64/iscsi/libiscsi.so.8+0xe254) #2 0xfffd1af0d174 (/usr/lib64/iscsi/libiscsi.so.8+0xd174) #3 0xfffd1af19fac (/usr/lib64/iscsi/libiscsi.so.8+0x19fac) #4 0xaaad45f9acc8 in iscsi_process_read /qemu/block/iscsi.c:403:5 qemu#5 0xaaad4623733c in aio_dispatch_handler /qemu/util/aio-posix.c:467:9 qemu#6 0xaaad4622f350 in aio_dispatch_handlers /qemu/util/aio-posix.c:510:20 qemu#7 0xaaad4622f350 in aio_dispatch /qemu/util/aio-posix.c:520 qemu#8 0xaaad46215944 in aio_ctx_dispatch /qemu/util/async.c:298:5 qemu#9 0xfffd1bed12f4 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x512f4) qemu#10 0xaaad46227de0 in glib_pollfds_poll /qemu/util/main-loop.c:219:9 qemu#11 0xaaad46227de0 in os_host_main_loop_wait /qemu/util/main-loop.c:242 qemu#12 0xaaad46227de0 in main_loop_wait /qemu/util/main-loop.c:518 qemu#13 0xaaad43d9d60c in qemu_main_loop /qemu/softmmu/vl.c:1662:9 qemu#14 0xaaad4607a5b0 in main /qemu/softmmu/main.c:49:5 qemu#15 0xfffd1a460b9c in __libc_start_main (/lib64/libc.so.6+0x20b9c) qemu#16 0xaaad43320740 in _start (aarch64-softmmu/qemu-system-aarch64+0x2c00740) Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20200418062602.10776-1-kuhn.chenqun@huawei.com Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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