Alexander Potapenko 897e8c5285 net/packet: check length in getsockopt() called with PACKET_HDRLEN ...

[ Upstream commit fd2c83b35752f0a8236b976978ad4658df14a59f ]

In the case getsockopt() is called with PACKET_HDRLEN and optlen < 4
|val| remains uninitialized and the syscall may behave differently
depending on its value, and even copy garbage to userspace on certain
architectures. To fix this we now return -EINVAL if optlen is too small.

This bug has been detected with KMSAN.

Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-10-08 10:26:08 +02:00

..

af_packet.c

net/packet: check length in getsockopt() called with PACKET_HDRLEN

2017-10-08 10:26:08 +02:00

diag.c

…

internal.h

…

Kconfig

…

Makefile

…