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Netlink receives say they came from the kernel

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recvfrom and recvmsg on a netlink socket reported no sender address. GLib's
network monitor converts the sender with g_socket_address_to_native to
check it is the kernel (port id 0) before believing a message, and with
nothing there it failed an assertion -- Epiphany, and anything else
watching the network through GIO, aborted at start. Every message on a
netlink socket here does come from the kernel, so that is what is reported:
a sockaddr_nl with port id 0 and no groups, as getsockname already says.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-25 12:46:51 +01:00
commit 73dcea7496
1 changed files with 23 additions and 0 deletions
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23
kernel/sys/sys_net.c
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@ -596,6 +596,20 @@ SYSCALL_DEFINE(recvfrom)
cap = alen; cap = alen;
if (cap > 0 && copy_to_user(uaddr, &sa, (uint64)cap) < 0) if (cap > 0 && copy_to_user(uaddr, &sa, (uint64)cap) < 0)
return -EFAULT; return -EFAULT;
} else if (sock_domain(s) == AF_NETLINK) {
// Everything on a netlink socket here comes from the kernel: port id
// 0, no groups. GLib's network monitor checks exactly that before it
// believes a message, and with no address at all it hit an assertion
// and every GNOME program that watches the network aborted.
uint16 nl[6] = { AF_NETLINK, 0, 0, 0, 0, 0 };
alen = (int)sizeof(nl);
int cap = alen;
if (ulenp && get_user(cap, ulenp) < 0)
return -EFAULT;
if (cap > alen)
cap = alen;
if (cap > 0 && copy_to_user(uaddr, nl, (uint64)cap) < 0)
return -EFAULT;
} }
if (ulenp && copy_to_user(ulenp, &alen, sizeof(alen)) < 0) if (ulenp && copy_to_user(ulenp, &alen, sizeof(alen)) < 0)
@ -1185,6 +1199,15 @@ SYSCALL_DEFINE(recvmsg)
alen = m.msg_namelen; alen = m.msg_namelen;
if (alen && copy_to_user((addr_t)m.msg_name, &sa, alen) < 0) if (alen && copy_to_user((addr_t)m.msg_name, &sa, alen) < 0)
return -EFAULT; return -EFAULT;
} else if (sock_domain(s) == AF_NETLINK) {
// The kernel, as in recvfrom above.
uint16 nl[6] = { AF_NETLINK, 0, 0, 0, 0, 0 };
alen = (uint32)sizeof(nl);
if (alen > m.msg_namelen)
alen = m.msg_namelen;
if (alen && copy_to_user((addr_t)m.msg_name, nl, alen) < 0)
return -EFAULT;
alen = (uint32)sizeof(nl);
} }
if (copy_to_user(umsg + __builtin_offsetof(struct msghdr, msg_namelen), if (copy_to_user(umsg + __builtin_offsetof(struct msghdr, msg_namelen),
&alen, sizeof(alen)) < 0) &alen, sizeof(alen)) < 0)