diff options
Diffstat (limited to 'meta/recipes-devtools/qemu/qemu/CVE-2020-29443.patch')
-rw-r--r-- | meta/recipes-devtools/qemu/qemu/CVE-2020-29443.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2020-29443.patch b/meta/recipes-devtools/qemu/qemu/CVE-2020-29443.patch new file mode 100644 index 0000000000..1528d5c2fd --- /dev/null +++ b/meta/recipes-devtools/qemu/qemu/CVE-2020-29443.patch @@ -0,0 +1,45 @@ +From 813212288970c39b1800f63e83ac6e96588095c6 Mon Sep 17 00:00:00 2001 +From: Paolo Bonzini <pbonzini@redhat.com> +Date: Tue, 1 Dec 2020 13:09:26 +0100 +Subject: [PATCH] ide: atapi: assert that the buffer pointer is in range + +A case was reported where s->io_buffer_index can be out of range. +The report skimped on the details but it seems to be triggered +by s->lba == -1 on the READ/READ CD paths (e.g. by sending an +ATAPI command with LBA = 0xFFFFFFFF). For now paper over it +with assertions. The first one ensures that there is no overflow +when incrementing s->io_buffer_index, the second checks for the +buffer overrun. + +Note that the buffer overrun is only a read, so I am not sure +if the assertion failure is actually less harmful than the overrun. + +Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> +Message-id: 20201201120926.56559-1-pbonzini@redhat.com +Reviewed-by: Kevin Wolf <kwolf@redhat.com> +Signed-off-by: Peter Maydell <peter.maydell@linaro.org> + +Upstream-Status: Backport +CVE: CVE-2020-29443 +Signed-off-by: Armin Kuster <akuster@mvista.com> + +--- + hw/ide/atapi.c | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c +index 14a2b0bb2f..e79157863f 100644 +--- a/hw/ide/atapi.c ++++ b/hw/ide/atapi.c +@@ -276,6 +276,8 @@ void ide_atapi_cmd_reply_end(IDEState *s) + s->packet_transfer_size -= size; + s->elementary_transfer_size -= size; + s->io_buffer_index += size; ++ assert(size <= s->io_buffer_total_len); ++ assert(s->io_buffer_index <= s->io_buffer_total_len); + + /* Some adapters process PIO data right away. In that case, we need + * to avoid mutual recursion between ide_transfer_start +-- +2.25.1 + |