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platform_kernel-5.15
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raw: Raw socket leak. 

The program below just leaks the raw kernel socket

int main() {
        int fd = socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
        struct sockaddr_in addr;

        memset(&addr, 0, sizeof(addr));
        inet_aton("127.0.0.1", &addr.sin_addr);
        addr.sin_family = AF_INET;
        addr.sin_port = htons(2048);
        sendto(fd,  "a", 1, MSG_MORE, &addr, sizeof(addr));
        return 0;
}

Corked packet is allocated via sock_wmalloc which holds the owner socket,
so one should uncork it and flush all pending data on close. Do this in the
same way as in UDP.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2008-06-04 15:16:12 -07:00 committed by David S. Miller
parent 199f7d24ae
commit 22dd485022
2 changed files with 18 additions and 0 deletions
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9
net/ipv4/raw.c
View File

@ -608,6 +608,14 @@ static void raw_close(struct sock *sk, long timeout)
sk_common_release(sk); sk_common_release(sk);
} }
static int raw_destroy(struct sock *sk)
{
lock_sock(sk);
ip_flush_pending_frames(sk);
release_sock(sk);
return 0;
}
/* This gets rid of all the nasties in af_inet. -DaveM */ /* This gets rid of all the nasties in af_inet. -DaveM */
static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{ {
@ -820,6 +828,7 @@ struct proto raw_prot = {
.name = "RAW", .name = "RAW",
.owner = THIS_MODULE, .owner = THIS_MODULE,
.close = raw_close, .close = raw_close,
.destroy = raw_destroy,
.connect = ip4_datagram_connect, .connect = ip4_datagram_connect,
.disconnect = udp_disconnect, .disconnect = udp_disconnect,
.ioctl = raw_ioctl, .ioctl = raw_ioctl,

9
net/ipv6/raw.c
View File

@ -1164,6 +1164,14 @@ static void rawv6_close(struct sock *sk, long timeout)
sk_common_release(sk); sk_common_release(sk);
} }
static int raw6_destroy(struct sock *sk)
{
lock_sock(sk);
ip6_flush_pending_frames(sk);
release_sock(sk);
return 0;
}
static int rawv6_init_sk(struct sock *sk) static int rawv6_init_sk(struct sock *sk)
{ {
struct raw6_sock *rp = raw6_sk(sk); struct raw6_sock *rp = raw6_sk(sk);
@ -1187,6 +1195,7 @@ struct proto rawv6_prot = {
.name = "RAWv6", .name = "RAWv6",
.owner = THIS_MODULE, .owner = THIS_MODULE,
.close = rawv6_close, .close = rawv6_close,
.destroy = raw6_destroy,
.connect = ip6_datagram_connect, .connect = ip6_datagram_connect,
.disconnect = udp_disconnect, .disconnect = udp_disconnect,
.ioctl = rawv6_ioctl, .ioctl = rawv6_ioctl,