Messages in this thread Patch in this message |  | | Date | Sat, 10 Nov 2001 11:53:16 -0800 | From | J Sloan <> | Subject | Confirm netfilter: repeatable oops in 2.4.15-pre2 |
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Confirmation, backing out the following 4 netfilter diffs makes 2.4.15-pre2 work fine on my firewall.
cu
jjs
"David S. Miller" wrote:
> From: Matthew Kirkwood <matthew@hairy.beasts.org> > Date: Sat, 10 Nov 2001 11:53:11 +0000 (GMT) > > On Fri, 9 Nov 2001, J Sloan wrote: > > > I have been running the 2.4.15-pre kernels and > > have found an interesting oops. I can reproduce > > it immediately, and reliably, just by issuing an ssh > > command (as a normal user). > > I'm seeing the same thing on my gateway, though I haven't > yet found my serial cable to get the oops translated. I > am back to 2.4.10 for now. > > Just back out the netfilter changes in 2.4.15-pre1, that > is the cause. > > Franks a lot, > David S. Miller > davem@redhat.com > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ diff -u --recursive --new-file v2.4.14/linux/net/ipv4/netfilter/ip_fw_compat.c linux/net/ipv4/netfilter/ip_fw_compat.c --- v2.4.14/linux/net/ipv4/netfilter/ip_fw_compat.c Fri Apr 27 14:15:01 2001 +++ linux/net/ipv4/netfilter/ip_fw_compat.c Wed Nov 7 14:39:36 2001 @@ -78,11 +78,19 @@ { int ret = FW_BLOCK; u_int16_t redirpt; + struct sk_buff *nskb; /* Assume worse case: any hook could change packet */ (*pskb)->nfcache |= NFC_UNKNOWN | NFC_ALTERED; if ((*pskb)->ip_summed == CHECKSUM_HW) (*pskb)->ip_summed = CHECKSUM_NONE; + + /* Firewall rules can alter TOS: raw socket may have clone of + skb: don't disturb it --RR */ + nskb = skb_unshare(*pskb, GFP_ATOMIC); + if (!nskb) + return NF_DROP; + *pskb = nskb; switch (hooknum) { case NF_IP_PRE_ROUTING: diff -u --recursive --new-file v2.4.14/linux/net/ipv4/netfilter/ip_nat_core.c linux/net/ipv4/netfilter/ip_nat_core.c --- v2.4.14/linux/net/ipv4/netfilter/ip_nat_core.c Wed May 16 10:31:27 2001 +++ linux/net/ipv4/netfilter/ip_nat_core.c Wed Nov 7 14:39:36 2001 @@ -734,6 +734,15 @@ synchronize_bh()) can vanish. */ READ_LOCK(&ip_nat_lock); for (i = 0; i < info->num_manips; i++) { + struct sk_buff *nskb; + /* raw socket may have clone of skb: don't disturb it --RR */ + nskb = skb_unshare(*pskb, GFP_ATOMIC); + if (!nskb) { + READ_UNLOCK(&ip_nat_lock); + return NF_DROP; + } + *pskb = nskb; + if (info->manips[i].direction == dir && info->manips[i].hooknum == hooknum) { DEBUGP("Mangling %p: %s to %u.%u.%u.%u %u\n", diff -u --recursive --new-file v2.4.14/linux/net/ipv4/netfilter/ipt_TCPMSS.c linux/net/ipv4/netfilter/ipt_TCPMSS.c --- v2.4.14/linux/net/ipv4/netfilter/ipt_TCPMSS.c Tue Oct 9 17:06:53 2001 +++ linux/net/ipv4/netfilter/ipt_TCPMSS.c Wed Nov 7 14:39:36 2001 @@ -48,6 +48,13 @@ u_int16_t tcplen, newtotlen, oldval, newmss; unsigned int i; u_int8_t *opt; + struct sk_buff *nskb; + + /* raw socket may have clone of skb: don't disturb it --RR */ + nskb = skb_unshare(*pskb, GFP_ATOMIC); + if (!nskb) + return NF_DROP; + *pskb = nskb; tcplen = (*pskb)->len - iph->ihl*4; diff -u --recursive --new-file v2.4.14/linux/net/ipv4/netfilter/ipt_TOS.c linux/net/ipv4/netfilter/ipt_TOS.c --- v2.4.14/linux/net/ipv4/netfilter/ipt_TOS.c Tue Oct 9 17:06:53 2001 +++ linux/net/ipv4/netfilter/ipt_TOS.c Wed Nov 7 14:39:36 2001 @@ -19,7 +19,14 @@ const struct ipt_tos_target_info *tosinfo = targinfo; if ((iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) { + struct sk_buff *nskb; u_int16_t diffs[2]; + + /* raw socket may have clone of skb: don't disturb it --RR */ + nskb = skb_unshare(*pskb, GFP_ATOMIC); + if (!nskb) + return NF_DROP; + *pskb = nskb; diffs[0] = htons(iph->tos) ^ 0xFFFF; iph->tos = (iph->tos & IPTOS_PREC_MASK) | tosinfo->tos; |  |