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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-04-03 19:51:35 +0300 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2014-05-05 22:15:02 +0200 |
| commit | d8d0a0bc7e194300e53a346d25fe5724fd588387 (patch) | |
| tree | bd483570cd987b5157c25fde9c93dc34f76fd9a6 /hw/ssi/pl022.c | |
| parent | 5f691ff91d323b6f97c6600405a7f9dc115a0ad1 (diff) | |
| download | qemu-d8d0a0bc7e194300e53a346d25fe5724fd588387.zip qemu-d8d0a0bc7e194300e53a346d25fe5724fd588387.tar.gz qemu-d8d0a0bc7e194300e53a346d25fe5724fd588387.tar.bz2 | |
pl022: fix buffer overun on invalid state load
CVE-2013-4530
pl022.c did not bounds check tx_fifo_head and
rx_fifo_head after loading them from file and
before they are used to dereference array.
Reported-by: Michael S. Tsirkin <mst@redhat.com
Reported-by: Anthony Liguori <anthony@codemonkey.ws>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'hw/ssi/pl022.c')
| -rw-r--r-- | hw/ssi/pl022.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/hw/ssi/pl022.c b/hw/ssi/pl022.c index fd479ef..b19bc71 100644 --- a/hw/ssi/pl022.c +++ b/hw/ssi/pl022.c @@ -240,11 +240,25 @@ static const MemoryRegionOps pl022_ops = { .endianness = DEVICE_NATIVE_ENDIAN, }; +static int pl022_post_load(void *opaque, int version_id) +{ + PL022State *s = opaque; + + if (s->tx_fifo_head < 0 || + s->tx_fifo_head >= ARRAY_SIZE(s->tx_fifo) || + s->rx_fifo_head < 0 || + s->rx_fifo_head >= ARRAY_SIZE(s->rx_fifo)) { + return -1; + } + return 0; +} + static const VMStateDescription vmstate_pl022 = { .name = "pl022_ssp", .version_id = 1, .minimum_version_id = 1, .minimum_version_id_old = 1, + .post_load = pl022_post_load, .fields = (VMStateField[]) { VMSTATE_UINT32(cr0, PL022State), VMSTATE_UINT32(cr1, PL022State), |