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Red Hat: CVE-2024-26611: kernel: xsk: fix usage of multi-buffer BPF helpers for ZC XDP (Multiple Advisories)

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Red Hat: CVE-2024-26611: kernel: xsk: fix usage of multi-buffer BPF helpers for ZC XDP (Multiple Advisories)

Severity
1
CVSS
(AV:L/AC:L/Au:M/C:N/I:N/A:P)
Published
03/11/2024
Created
12/06/2024
Added
12/05/2024
Modified
12/16/2024

Description

In the Linux kernel, the following vulnerability has been resolved: xsk: fix usage of multi-buffer BPF helpers for ZC XDP Currently when packet is shrunk via bpf_xdp_adjust_tail() and memory type is set to MEM_TYPE_XSK_BUFF_POOL, null ptr dereference happens: [1136314.192256] BUG: kernel NULL pointer dereference, address: 0000000000000034 [1136314.203943] #PF: supervisor read access in kernel mode [1136314.213768] #PF: error_code(0x0000) - not-present page [1136314.223550] PGD 0 P4D 0 [1136314.230684] Oops: 0000 [#1] PREEMPT SMP NOPTI [1136314.239621] CPU: 8 PID: 54203 Comm: xdpsock Not tainted 6.6.0+ #257 [1136314.250469] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [1136314.265615] RIP: 0010:__xdp_return+0x6c/0x210 [1136314.274653] Code: ad 00 48 8b 47 08 49 89 f8 a8 01 0f 85 9b 01 00 00 0f 1f 44 00 00 f0 41 ff 48 34 75 32 4c 89 c7 e9 79 cd 80 ff 83 fe 03 75 17 <f6> 41 34 01 0f 85 02 01 00 00 48 89 cf e9 22 cc 1e 00 e9 3d d2 86 [1136314.302907] RSP: 0018:ffffc900089f8db0 EFLAGS: 00010246 [1136314.312967] RAX: ffffc9003168aed0 RBX: ffff8881c3300000 RCX: 0000000000000000 [1136314.324953] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffc9003168c000 [1136314.336929] RBP: 0000000000000ae0 R08: 0000000000000002 R09: 0000000000010000 [1136314.348844] R10: ffffc9000e495000 R11: 0000000000000040 R12: 0000000000000001 [1136314.360706] R13: 0000000000000524 R14: ffffc9003168aec0 R15: 0000000000000001 [1136314.373298] FS:00007f8df8bbcb80(0000) GS:ffff8897e0e00000(0000) knlGS:0000000000000000 [1136314.386105] CS:0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1136314.396532] CR2: 0000000000000034 CR3: 00000001aa912002 CR4: 00000000007706f0 [1136314.408377] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [1136314.420173] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [1136314.431890] PKRU: 55555554 [1136314.439143] Call Trace: [1136314.446058]<IRQ> [1136314.452465]? __die+0x20/0x70 [1136314.459881]? page_fault_oops+0x15b/0x440 [1136314.468305]? exc_page_fault+0x6a/0x150 [1136314.476491]? asm_exc_page_fault+0x22/0x30 [1136314.484927]? __xdp_return+0x6c/0x210 [1136314.492863]bpf_xdp_adjust_tail+0x155/0x1d0 [1136314.501269]bpf_prog_ccc47ae29d3b6570_xdp_sock_prog+0x15/0x60 [1136314.511263]ice_clean_rx_irq_zc+0x206/0xc60 [ice] [1136314.520222]? ice_xmit_zc+0x6e/0x150 [ice] [1136314.528506]ice_napi_poll+0x467/0x670 [ice] [1136314.536858]? ttwu_do_activate.constprop.0+0x8f/0x1a0 [1136314.546010]__napi_poll+0x29/0x1b0 [1136314.553462]net_rx_action+0x133/0x270 [1136314.561619]__do_softirq+0xbe/0x28e [1136314.569303]do_softirq+0x3f/0x60 This comes from __xdp_return() call with xdp_buff argument passed as NULL which is supposed to be consumed by xsk_buff_free() call. To address this properly, in ZC case, a node that represents the frag being removed has to be pulled out of xskb_list. Introduce appropriate xsk helpers to do such node operation and use them accordingly within bpf_xdp_adjust_tail().

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • CVE-2024-26611
  • RHSA-2024:9315
  • 查看数 703
  • 已创建
  • 最后回复

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