Patch "netfilter: iptables: Fix null-ptr-deref in iptable_nat_table_init()." has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    netfilter: iptables: Fix null-ptr-deref in iptable_nat_table_init().

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-iptables-fix-null-ptr-deref-in-iptable_nat.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ec11bf2a5686e809b90273466bf894a67156b9b0
Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Date:   Thu Jul 25 12:28:20 2024 -0700

    netfilter: iptables: Fix null-ptr-deref in iptable_nat_table_init().
    
    [ Upstream commit 5830aa863981d43560748aa93589c0695191d95d ]
    
    We had a report that iptables-restore sometimes triggered null-ptr-deref
    at boot time. [0]
    
    The problem is that iptable_nat_table_init() is exposed to user space
    before the kernel fully initialises netns.
    
    In the small race window, a user could call iptable_nat_table_init()
    that accesses net_generic(net, iptable_nat_net_id), which is available
    only after registering iptable_nat_net_ops.
    
    Let's call register_pernet_subsys() before xt_register_template().
    
    [0]:
    bpfilter: Loaded bpfilter_umh pid 11702
    Started bpfilter
    BUG: kernel NULL pointer dereference, address: 0000000000000013
     PF: supervisor write access in kernel mode
     PF: error_code(0x0002) - not-present page
    PGD 0 P4D 0
    PREEMPT SMP NOPTI
    CPU: 2 PID: 11879 Comm: iptables-restor Not tainted 6.1.92-99.174.amzn2023.x86_64 #1
    Hardware name: Amazon EC2 c6i.4xlarge/, BIOS 1.0 10/16/2017
    RIP: 0010:iptable_nat_table_init (net/ipv4/netfilter/iptable_nat.c:87 net/ipv4/netfilter/iptable_nat.c:121) iptable_nat
    Code: 10 4c 89 f6 48 89 ef e8 0b 19 bb ff 41 89 c4 85 c0 75 38 41 83 c7 01 49 83 c6 28 41 83 ff 04 75 dc 48 8b 44 24 08 48 8b 0c 24 <48> 89 08 4c 89 ef e8 a2 3b a2 cf 48 83 c4 10 44 89 e0 5b 5d 41 5c
    RSP: 0018:ffffbef902843cd0 EFLAGS: 00010246
    RAX: 0000000000000013 RBX: ffff9f4b052caa20 RCX: ffff9f4b20988d80
    RDX: 0000000000000000 RSI: 0000000000000064 RDI: ffffffffc04201c0
    RBP: ffff9f4b29394000 R08: ffff9f4b07f77258 R09: ffff9f4b07f77240
    R10: 0000000000000000 R11: ffff9f4b09635388 R12: 0000000000000000
    R13: ffff9f4b1a3c6c00 R14: ffff9f4b20988e20 R15: 0000000000000004
    FS:  00007f6284340000(0000) GS:ffff9f51fe280000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000013 CR3: 00000001d10a6005 CR4: 00000000007706e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    PKRU: 55555554
    Call Trace:
     <TASK>
     ? show_trace_log_lvl (arch/x86/kernel/dumpstack.c:259)
     ? show_trace_log_lvl (arch/x86/kernel/dumpstack.c:259)
     ? xt_find_table_lock (net/netfilter/x_tables.c:1259)
     ? __die_body.cold (arch/x86/kernel/dumpstack.c:478 arch/x86/kernel/dumpstack.c:420)
     ? page_fault_oops (arch/x86/mm/fault.c:727)
     ? exc_page_fault (./arch/x86/include/asm/irqflags.h:40 ./arch/x86/include/asm/irqflags.h:75 arch/x86/mm/fault.c:1470 arch/x86/mm/fault.c:1518)
     ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:570)
     ? iptable_nat_table_init (net/ipv4/netfilter/iptable_nat.c:87 net/ipv4/netfilter/iptable_nat.c:121) iptable_nat
     xt_find_table_lock (net/netfilter/x_tables.c:1259)
     xt_request_find_table_lock (net/netfilter/x_tables.c:1287)
     get_info (net/ipv4/netfilter/ip_tables.c:965)
     ? security_capable (security/security.c:809 (discriminator 13))
     ? ns_capable (kernel/capability.c:376 kernel/capability.c:397)
     ? do_ipt_get_ctl (net/ipv4/netfilter/ip_tables.c:1656)
     ? bpfilter_send_req (net/bpfilter/bpfilter_kern.c:52) bpfilter
     nf_getsockopt (net/netfilter/nf_sockopt.c:116)
     ip_getsockopt (net/ipv4/ip_sockglue.c:1827)
     __sys_getsockopt (net/socket.c:2327)
     __x64_sys_getsockopt (net/socket.c:2342 net/socket.c:2339 net/socket.c:2339)
     do_syscall_64 (arch/x86/entry/common.c:51 arch/x86/entry/common.c:81)
     entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
    RIP: 0033:0x7f62844685ee
    Code: 48 8b 0d 45 28 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 09
    RSP: 002b:00007ffd1f83d638 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
    RAX: ffffffffffffffda RBX: 00007ffd1f83d680 RCX: 00007f62844685ee
    RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004
    RBP: 0000000000000004 R08: 00007ffd1f83d670 R09: 0000558798ffa2a0
    R10: 00007ffd1f83d680 R11: 0000000000000246 R12: 00007ffd1f83e3b2
    R13: 00007f628455baa0 R14: 00007ffd1f83d7b0 R15: 00007f628457a008
     </TASK>
    Modules linked in: iptable_nat(+) bpfilter rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache veth xt_state xt_connmark xt_nat xt_statistic xt_MASQUERADE xt_mark xt_addrtype ipt_REJECT nf_reject_ipv4 nft_chain_nat nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_comment nft_compat nf_tables nfnetlink overlay nls_ascii nls_cp437 vfat fat ghash_clmulni_intel aesni_intel ena crypto_simd ptp cryptd i8042 pps_core serio button sunrpc sch_fq_codel configfs loop dm_mod fuse dax dmi_sysfs crc32_pclmul crc32c_intel efivarfs
    CR2: 0000000000000013
    
    Fixes: fdacd57c79b7 ("netfilter: x_tables: never register tables by default")
    Reported-by: Takahiro Kawahara <takawaha@xxxxxxxxxxxx>
    Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
    Reviewed-by: Florian Westphal <fw@xxxxxxxxx>
    Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index 45d7e072e6a54..226000a740860 100644
--- a/net/ipv4/netfilter/iptable_nat.c
+++ b/net/ipv4/netfilter/iptable_nat.c
@@ -152,25 +152,27 @@ static struct pernet_operations iptable_nat_net_ops = {
 
 static int __init iptable_nat_init(void)
 {
-	int ret = xt_register_template(&nf_nat_ipv4_table,
-				       iptable_nat_table_init);
+	int ret;
 
+	/* net->gen->ptr[iptable_nat_net_id] must be allocated
+	 * before calling iptable_nat_table_init().
+	 */
+	ret = register_pernet_subsys(&iptable_nat_net_ops);
 	if (ret < 0)
 		return ret;
 
-	ret = register_pernet_subsys(&iptable_nat_net_ops);
-	if (ret < 0) {
-		xt_unregister_template(&nf_nat_ipv4_table);
-		return ret;
-	}
+	ret = xt_register_template(&nf_nat_ipv4_table,
+				   iptable_nat_table_init);
+	if (ret < 0)
+		unregister_pernet_subsys(&iptable_nat_net_ops);
 
 	return ret;
 }
 
 static void __exit iptable_nat_exit(void)
 {
-	unregister_pernet_subsys(&iptable_nat_net_ops);
 	xt_unregister_template(&nf_nat_ipv4_table);
+	unregister_pernet_subsys(&iptable_nat_net_ops);
 }
 
 module_init(iptable_nat_init);




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