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| author | Kristof Provost <kp@FreeBSD.org> | 2021-02-08 09:04:27 +0000 |
|---|---|---|
| committer | Kristof Provost <kp@FreeBSD.org> | 2021-02-17 13:12:54 +0000 |
| commit | 05530211165f59b8dabc02adaf26ea29c2726ebc (patch) | |
| tree | 5cca2fa2f013938e82a51b06eb66effc39f1a436 | |
| parent | f9a66bb91ae1f3f175d0c16730c683841525bd1d (diff) | |
| download | src-05530211165f59b8dabc02adaf26ea29c2726ebc.tar.gz src-05530211165f59b8dabc02adaf26ea29c2726ebc.zip | |
Widen ifnet_detach_sxlock coverage
Widen the ifnet_detach_sxlock to cover the entire vnet sysuninit code.
This ensures that we can't end up having the vnet_sysuninit free the UDP
pcb while the detach code is running and trying to purge the UDP pcb.
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D28530
(cherry picked from commit 6d2a10d96fb5d4ee42fd67b0b07a6d098db5d55a)
| -rw-r--r-- | sys/net/if.c | 13 | ||||
| -rw-r--r-- | sys/net/if.h | 3 | ||||
| -rw-r--r-- | sys/net/vnet.c | 2 |
3 files changed, 11 insertions, 7 deletions
diff --git a/sys/net/if.c b/sys/net/if.c index 74fdd066fd2d..c85cfab19bf6 100644 --- a/sys/net/if.c +++ b/sys/net/if.c @@ -315,7 +315,8 @@ struct sx ifnet_sxlock; SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); struct sx ifnet_detach_sxlock; -SX_SYSINIT(ifnet_detach, &ifnet_detach_sxlock, "ifnet_detach_sx"); +SX_SYSINIT_FLAGS(ifnet_detach, &ifnet_detach_sxlock, "ifnet_detach_sx", + SX_RECURSE); /* * The allocation of network interfaces is a rather non-atomic affair; we @@ -546,9 +547,7 @@ vnet_if_return(const void *unused __unused) IFNET_WUNLOCK(); for (int j = 0; j < i; j++) { - sx_xlock(&ifnet_detach_sxlock); if_vmove(pending[j], pending[j]->if_home_vnet); - sx_xunlock(&ifnet_detach_sxlock); } free(pending, M_IFNET); @@ -1124,9 +1123,9 @@ if_detach(struct ifnet *ifp) CURVNET_SET_QUIET(ifp->if_vnet); found = if_unlink_ifnet(ifp, false); if (found) { - sx_slock(&ifnet_detach_sxlock); + sx_xlock(&ifnet_detach_sxlock); if_detach_internal(ifp, 0, NULL); - sx_sunlock(&ifnet_detach_sxlock); + sx_xunlock(&ifnet_detach_sxlock); } CURVNET_RESTORE(); } @@ -3015,9 +3014,9 @@ ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) error = priv_check(td, PRIV_NET_IFDESTROY); if (error == 0) { - sx_slock(&ifnet_detach_sxlock); + sx_xlock(&ifnet_detach_sxlock); error = if_clone_destroy(ifr->ifr_name); - sx_sunlock(&ifnet_detach_sxlock); + sx_xunlock(&ifnet_detach_sxlock); } goto out_noref; diff --git a/sys/net/if.h b/sys/net/if.h index eabd4e053733..e6073563bce2 100644 --- a/sys/net/if.h +++ b/sys/net/if.h @@ -604,6 +604,9 @@ struct ifdownreason { MALLOC_DECLARE(M_IFADDR); MALLOC_DECLARE(M_IFMADDR); #endif + +extern struct sx ifnet_detach_sxlock; + #endif #ifndef _KERNEL diff --git a/sys/net/vnet.c b/sys/net/vnet.c index c5dafedbc6b2..2480fc8dd86c 100644 --- a/sys/net/vnet.c +++ b/sys/net/vnet.c @@ -283,7 +283,9 @@ vnet_destroy(struct vnet *vnet) vnet->vnet_shutdown = true; CURVNET_SET_QUIET(vnet); + sx_xlock(&ifnet_detach_sxlock); vnet_sysuninit(); + sx_xunlock(&ifnet_detach_sxlock); CURVNET_RESTORE(); /* |