ghsa-wp5w-r3x6-pmqh
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
ice: track AF_XDP ZC enabled queues in bitmap
Commit c7a219048e45 ("ice: Remove xsk_buff_pool from VSI structure") silently introduced a regression and broke the Tx side of AF_XDP in copy mode. xsk_pool on ice_ring is set only based on the existence of the XDP prog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed. That is not something that should happen for copy mode as it should use the regular data path ice_clean_tx_irq.
This results in a following splat when xdpsock is run in txonly or l2fwd scenarios in copy mode:
Fix this by introducing the bitmap of queues that are zero-copy enabled, where each bit, corresponding to a queue id that xsk pool is being configured on, will be set/cleared within ice_xsk_pool_{en,dis}able and checked within ice_xsk_pool(). The latter is a function used for deciding which napi poll routine is executed. Idea is being taken from our other drivers such as i40e and ixgbe.
{
"affected": [],
"aliases": [
"CVE-2021-47127"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-15T21:15:07Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: track AF_XDP ZC enabled queues in bitmap\n\nCommit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI structure\")\nsilently introduced a regression and broke the Tx side of AF_XDP in copy\nmode. xsk_pool on ice_ring is set only based on the existence of the XDP\nprog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed.\nThat is not something that should happen for copy mode as it should use\nthe regular data path ice_clean_tx_irq.\n\nThis results in a following splat when xdpsock is run in txonly or l2fwd\nscenarios in copy mode:\n\n\u003csnip\u003e\n[ 106.050195] BUG: kernel NULL pointer dereference, address: 0000000000000030\n[ 106.057269] #PF: supervisor read access in kernel mode\n[ 106.062493] #PF: error_code(0x0000) - not-present page\n[ 106.067709] PGD 0 P4D 0\n[ 106.070293] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 106.074721] CPU: 61 PID: 0 Comm: swapper/61 Not tainted 5.12.0-rc2+ #45\n[ 106.081436] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[ 106.092027] RIP: 0010:xp_raw_get_dma+0x36/0x50\n[ 106.096551] Code: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c \u003c48\u003e 8b 04 d0 48 83 e0 fe 48 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00\n[ 106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206\n[ 106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800\n[ 106.128137] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88984cd8b800\n[ 106.135383] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800\n[ 106.142628] R10: 0000000000000000 R11: ffffffff826060c0 R12: 00000000000000ff\n[ 106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018\n[ 106.157117] FS: 0000000000000000(0000) GS:ffff8897e0f40000(0000) knlGS:0000000000000000\n[ 106.165332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0\n[ 106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 106.185653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 106.192898] PKRU: 55555554\n[ 106.195653] Call Trace:\n[ 106.198143] \u003cIRQ\u003e\n[ 106.200196] ice_clean_tx_irq_zc+0x183/0x2a0 [ice]\n[ 106.205087] ice_napi_poll+0x3e/0x590 [ice]\n[ 106.209356] __napi_poll+0x2a/0x160\n[ 106.212911] net_rx_action+0xd6/0x200\n[ 106.216634] __do_softirq+0xbf/0x29b\n[ 106.220274] irq_exit_rcu+0x88/0xc0\n[ 106.223819] common_interrupt+0x7b/0xa0\n[ 106.227719] \u003c/IRQ\u003e\n[ 106.229857] asm_common_interrupt+0x1e/0x40\n\u003c/snip\u003e\n\nFix this by introducing the bitmap of queues that are zero-copy enabled,\nwhere each bit, corresponding to a queue id that xsk pool is being\nconfigured on, will be set/cleared within ice_xsk_pool_{en,dis}able and\nchecked within ice_xsk_pool(). The latter is a function used for\ndeciding which napi poll routine is executed.\nIdea is being taken from our other drivers such as i40e and ixgbe.",
"id": "GHSA-wp5w-r3x6-pmqh",
"modified": "2024-03-15T21:30:44Z",
"published": "2024-03-15T21:30:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47127"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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