diff options
Diffstat (limited to 'system/xen/patches/xsa162-qemuu.patch')
| -rw-r--r-- | system/xen/patches/xsa162-qemuu.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/system/xen/patches/xsa162-qemuu.patch b/system/xen/patches/xsa162-qemuu.patch new file mode 100644 index 0000000000000..2e3352d88b625 --- /dev/null +++ b/system/xen/patches/xsa162-qemuu.patch @@ -0,0 +1,42 @@ +net: pcnet: add check to validate receive data size(CVE-2015-7504) + +In loopback mode, pcnet_receive routine appends CRC code to the +receive buffer. If the data size given is same as the buffer size, +the appended CRC code overwrites 4 bytes after s->buffer. Added a +check to avoid that. + +Reported-by: Qinghao Tang <luodalongde@gmail.com> +Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> +--- + hw/net/pcnet.c | 10 ++++++---- + 1 file changed, 6 insertions(+), 4 deletions(-) + +diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c +index 3437376..5f55591 100644 +--- a/hw/net/pcnet.c ++++ b/hw/net/pcnet.c +@@ -1085,7 +1085,7 @@ ssize_t pcnet_receive(NetClientState *nc, const uint8_t *buf, size_t size_) + uint32_t fcs = ~0; + uint8_t *p = src; + +- while (p != &src[size-4]) ++ while (p != &src[size]) + CRC(fcs, *p++); + crc_err = (*(uint32_t *)p != htonl(fcs)); + } +@@ -1234,8 +1234,10 @@ static void pcnet_transmit(PCNetState *s) + bcnt = 4096 - GET_FIELD(tmd.length, TMDL, BCNT); + + /* if multi-tmd packet outsizes s->buffer then skip it silently. +- Note: this is not what real hw does */ +- if (s->xmit_pos + bcnt > sizeof(s->buffer)) { ++ * Note: this is not what real hw does. ++ * Last four bytes of s->buffer are used to store CRC FCS code. ++ */ ++ if (s->xmit_pos + bcnt > sizeof(s->buffer) - 4) { + s->xmit_pos = -1; + goto txdone; + } +-- +2.4.3 + |