CVE-2024-42321: net: flow_dissector: use DEBUG_NET_WARN_ON_ONCE

In the Linux kernel, the following vulnerability has been resolved:

net: flowdissector: use DEBUGNETWARNONONCE

The following splat is easy to reproduce upstream as well as in -stable kernels. Florian Westphal provided the following commit:

d1dab4f71d37 ("net: add and use skbgethashsymmetricnet")

but this complementary fix has been also suggested by Willem de Bruijn and it can be easily backported to -stable kernel which consists in using DEBUGNETWARNONONCE instead to silence the following splat given skbgethash() is used by the nftables tracing infrastructure to to identify packets in traces.

[69133.561393] ------------[ cut here ]------------ [69133.561404] WARNING: CPU: 0 PID: 43576 at net/core/flowdissector.c:1104 skbflowdissect+0x134f/ [...] [69133.561944] CPU: 0 PID: 43576 Comm: socat Not tainted 6.10.0-rc7+ #379 [69133.561959] RIP: 0010:skbflowdissect+0x134f/0x2ad0 [69133.561970] Code: 83 f9 04 0f 84 b3 00 00 00 45 85 c9 0f 84 aa 00 00 00 41 83 f9 02 0f 84 81 fc ff ff 44 0f b7 b4 24 80 00 00 00 e9 8b f9 ff ff <0f> 0b e9 20 f3 ff ff 41 f6 c6 20 0f 84 e4 ef ff ff 48 8d 7b 12 e8 [69133.561979] RSP: 0018:ffffc90000006fc0 EFLAGS: 00010246 [69133.561988] RAX: 0000000000000000 RBX: ffffffff82f33e20 RCX: ffffffff81ab7e19 [69133.561994] RDX: dffffc0000000000 RSI: ffffc90000007388 RDI: ffff888103a1b418 [69133.562001] RBP: ffffc90000007310 R08: 0000000000000000 R09: 0000000000000000 [69133.562007] R10: ffffc90000007388 R11: ffffffff810cface R12: ffff888103a1b400 [69133.562013] R13: 0000000000000000 R14: ffffffff82f33e2a R15: ffffffff82f33e28 [69133.562020] FS: 00007f40f7131740(0000) GS:ffff888390800000(0000) knlGS:0000000000000000 [69133.562027] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [69133.562033] CR2: 00007f40f7346ee0 CR3: 000000015d200001 CR4: 00000000001706f0 [69133.562040] Call Trace: [69133.562044] <IRQ> [69133.562049] ? warn+0x9f/0x1a0 [ 1211.841384] ? skbflowdissect+0x107e/0x2860 [...] [ 1211.841496] ? bpfflowdissect+0x160/0x160 [ 1211.841753] skbgethash+0x97/0x280 [ 1211.841765] ? skbgethashsymmetric+0x230/0x230 [ 1211.841776] ? modfind+0xbf/0xe0 [ 1211.841786] ? getstackinfonoinstr+0x12/0xe0 [ 1211.841798] ? bpfksymfind+0x56/0xe0 [ 1211.841807] ? rcureadunlock+0x2a/0x70 [ 1211.841819] nfttraceinit+0x1b9/0x1c0 [nftables] [ 1211.841895] ? nfttracenotify+0x830/0x830 [nftables] [ 1211.841964] ? getstackinfo+0x2b/0x80 [ 1211.841975] ? nftdochainarp+0x80/0x80 [nftables] [ 1211.842044] nftdochain+0x79c/0x850 [nftables]