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author | Philip Pettersson <philip.pettersson@gmail.com> | 2016-12-14 13:24:56 +0100 |
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committer | Sasha Levin <alexander.levin@verizon.com> | 2016-12-23 10:39:29 -0500 |
commit | 5c120b79dd6601a987eb33214f2686e5b75f3c3e (patch) | |
tree | 18d1f6a6a99d476afd35d1f9c429769afdd64780 /Makefile | |
parent | ee79b622f43bab46bd6ff778b3cd2e4af4784bc2 (diff) |
packet: fix race condition in packet_set_ring
[ Upstream commit 84ac7260236a49c79eede91617700174c2c19b0c ]
When packet_set_ring creates a ring buffer it will initialize a
struct timer_list if the packet version is TPACKET_V3. This value
can then be raced by a different thread calling setsockopt to
set the version to TPACKET_V1 before packet_set_ring has finished.
This leads to a use-after-free on a function pointer in the
struct timer_list when the socket is closed as the previously
initialized timer will not be deleted.
The bug is fixed by taking lock_sock(sk) in packet_setsockopt when
changing the packet version while also taking the lock at the start
of packet_set_ring.
Fixes: f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation.")
Signed-off-by: Philip Pettersson <philip.pettersson@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions