diff options
| author | Qiang Liu <cyruscyliu@gmail.com> | 2021-08-04 14:51:50 +0800 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-08-31 14:34:36 +0200 |
| commit | 2b3a98255c90d8d2f9f87a73eb33371961508517 (patch) | |
| tree | 6bc9c3a868a27fbbb6480fd3ad66c3465773f207 /tests/qtest/meson.build | |
| parent | 7852a77f598635a67a222b6c1463c8b46098aed2 (diff) | |
hw/display/xlnx_dp: fix an out-of-bounds read in xlnx_dp_read
xlnx_dp_read allows an out-of-bounds read at its default branch because
of an improper index.
According to
https://www.xilinx.com/html_docs/registers/ug1087/ug1087-zynq-ultrascale-registers.html
(DP Module), registers 0x3A4/0x3A4/0x3AC are allowed.
DP_INT_MASK 0x000003A4 32 mixed 0xFFFFF03F Interrupt Mask Register for intrN.
DP_INT_EN 0x000003A8 32 mixed 0x00000000 Interrupt Enable Register.
DP_INT_DS 0x000003AC 32 mixed 0x00000000 Interrupt Disable Register.
In xlnx_dp_write, when the offset is 0x3A8 and 0x3AC, the virtual device
will write s->core_registers[0x3A4
>> 2]. That is to say, the maxize of s->core_registers could be ((0x3A4
>> 2) + 1). However, the current size of s->core_registers is (0x3AF >>
>> 2), that is ((0x3A4 >> 2) + 2), which is out of the range.
In xlxn_dp_read, the access to offset 0x3A8 or 0x3AC will be directed to
the offset 0x3A8 (incorrect functionality) or 0x3AC (out-of-bounds read)
rather than 0x3A4.
This patch enforces the read access to offset 0x3A8 and 0x3AC to 0x3A4,
but does not adjust the size of s->core_registers to avoid breaking
migration.
Fixes: 58ac482a66de ("introduce xlnx-dp")
Signed-off-by: Qiang Liu <cyruscyliu@gmail.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Acked-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <1628059910-12060-1-git-send-email-cyruscyliu@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'tests/qtest/meson.build')
| -rw-r--r-- | tests/qtest/meson.build | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build index 2bc3efd49f..757bb8499a 100644 --- a/tests/qtest/meson.build +++ b/tests/qtest/meson.build @@ -187,6 +187,7 @@ qtests_aarch64 = \ 'numa-test', 'boot-serial-test', 'xlnx-can-test', + 'fuzz-xlnx-dp-test', 'migration-test'] qtests_s390x = \ |