* [PATCHv2] netlink: Don't shift on 64 for ngroups
@ 2018-08-05 0:35 Dmitry Safonov
2018-08-05 0:53 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Dmitry Safonov @ 2018-08-05 0:35 UTC (permalink / raw)
To: linux-kernel
Cc: Dmitry Safonov, Nathan Chancellor, David S. Miller, Herbert Xu,
Steffen Klassert, netdev, stable
It's legal to have 64 groups for netlink_sock.
As user-supplied nladdr->nl_groups is __u32, it's possible to subscribe
only to first 32 groups.
The check for correctness of .bind() userspace supplied parameter
is done by applying mask made from ngroups shift. Which broke Android
as they have 64 groups and the shift for mask resulted in an overflow.
Fixes: 61f4b23769f0 ("netlink: Don't shift with UB on nlk->ngroups")
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: netdev@vger.kernel.org
Cc: stable@vger.kernel.org
Reported-and-Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
v2:
sizeof() is in bytes
net/netlink/af_netlink.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 7d860a22e5fb..d6ff4d409437 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1011,8 +1011,8 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
if (nlk->ngroups == 0)
groups = 0;
- else
- groups &= (1ULL << nlk->ngroups) - 1;
+ else if (nlk->ngroups < 8*sizeof(groups))
+ groups &= (1UL << nlk->ngroups) - 1;
bound = nlk->bound;
if (bound) {
--
2.13.6
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCHv2] netlink: Don't shift on 64 for ngroups
2018-08-05 0:35 [PATCHv2] netlink: Don't shift on 64 for ngroups Dmitry Safonov
@ 2018-08-05 0:53 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2018-08-05 0:53 UTC (permalink / raw)
To: dima
Cc: linux-kernel, natechancellor, herbert, steffen.klassert, netdev, stable
From: Dmitry Safonov <dima@arista.com>
Date: Sun, 5 Aug 2018 01:35:53 +0100
> It's legal to have 64 groups for netlink_sock.
>
> As user-supplied nladdr->nl_groups is __u32, it's possible to subscribe
> only to first 32 groups.
>
> The check for correctness of .bind() userspace supplied parameter
> is done by applying mask made from ngroups shift. Which broke Android
> as they have 64 groups and the shift for mask resulted in an overflow.
>
> Fixes: 61f4b23769f0 ("netlink: Don't shift with UB on nlk->ngroups")
> Reported-and-Tested-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Dmitry Safonov <dima@arista.com>
Applied and queued up for -stable.
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