ghsa-v9jf-g2rr-85c3
Vulnerability from github
Published
2024-12-27 15:31
Modified
2025-01-08 18:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

xsk: fix OOB map writes when deleting elements

Jordy says:

" In the xsk_map_delete_elem function an unsigned integer (map->max_entries) is compared with a user-controlled signed integer (k). Due to implicit type conversion, a large unsigned value for map->max_entries can bypass the intended bounds check:

if (k >= map->max_entries)
    return -EINVAL;

This allows k to hold a negative value (between -2147483648 and -2), which is then used as an array index in m->xsk_map[k], which results in an out-of-bounds access.

spin_lock_bh(&m->lock);
map_entry = &m->xsk_map[k]; // Out-of-bounds map_entry
old_xs = unrcu_pointer(xchg(map_entry, NULL));  // Oob write
if (old_xs)
    xsk_map_sock_delete(old_xs, map_entry);
spin_unlock_bh(&m->lock);

The xchg operation can then be used to cause an out-of-bounds write. Moreover, the invalid map_entry passed to xsk_map_sock_delete can lead to further memory corruption. "

It indeed results in following splat:

[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108 [76612.904330] #PF: supervisor write access in kernel mode [76612.909639] #PF: error_code(0x0002) - not-present page [76612.914855] PGD 0 P4D 0 [76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP [76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470 [76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60 [76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff <48> 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31 [76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246 [76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000 [76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000 [76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007 [76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8 [76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0 [76613.005303] FS: 00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000 [76613.013517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0 [76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [76613.041086] PKRU: 55555554 [76613.043842] Call Trace: [76613.046331] [76613.048468] ? __die+0x20/0x60 [76613.051581] ? page_fault_oops+0x15a/0x450 [76613.055747] ? search_extable+0x22/0x30 [76613.059649] ? search_bpf_extables+0x5f/0x80 [76613.063988] ? exc_page_fault+0xa9/0x140 [76613.067975] ? asm_exc_page_fault+0x22/0x30 [76613.072229] ? xsk_map_delete_elem+0x2d/0x60 [76613.076573] ? xsk_map_delete_elem+0x23/0x60 [76613.080914] __sys_bpf+0x19b7/0x23c0 [76613.084555] __x64_sys_bpf+0x1a/0x20 [76613.088194] do_syscall_64+0x37/0xb0 [76613.091832] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [76613.096962] RIP: 0033:0x7f80b6d1e88d [76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48 [76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141 [76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d [76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003 [76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000 [76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8 [76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00 ---truncated---

Show details on source website

To clipboard 

{
   affected: [],
   aliases: [
      "CVE-2024-56614",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-787",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-12-27T15:15:20Z",
      severity: "HIGH",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix OOB map writes when deleting elements\n\nJordy says:\n\n\"\nIn the xsk_map_delete_elem function an unsigned integer\n(map->max_entries) is compared with a user-controlled signed integer\n(k). Due to implicit type conversion, a large unsigned value for\nmap->max_entries can bypass the intended bounds check:\n\n\tif (k >= map->max_entries)\n\t\treturn -EINVAL;\n\nThis allows k to hold a negative value (between -2147483648 and -2),\nwhich is then used as an array index in m->xsk_map[k], which results\nin an out-of-bounds access.\n\n\tspin_lock_bh(&m->lock);\n\tmap_entry = &m->xsk_map[k]; // Out-of-bounds map_entry\n\told_xs = unrcu_pointer(xchg(map_entry, NULL));  // Oob write\n\tif (old_xs)\n\t\txsk_map_sock_delete(old_xs, map_entry);\n\tspin_unlock_bh(&m->lock);\n\nThe xchg operation can then be used to cause an out-of-bounds write.\nMoreover, the invalid map_entry passed to xsk_map_sock_delete can lead\nto further memory corruption.\n\"\n\nIt indeed results in following splat:\n\n[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108\n[76612.904330] #PF: supervisor write access in kernel mode\n[76612.909639] #PF: error_code(0x0002) - not-present page\n[76612.914855] PGD 0 P4D 0\n[76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP\n[76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470\n[76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60\n[76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff <48> 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31\n[76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246\n[76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000\n[76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000\n[76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007\n[76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8\n[76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0\n[76613.005303] FS:  00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000\n[76613.013517] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0\n[76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[76613.041086] PKRU: 55555554\n[76613.043842] Call Trace:\n[76613.046331]  <TASK>\n[76613.048468]  ? __die+0x20/0x60\n[76613.051581]  ? page_fault_oops+0x15a/0x450\n[76613.055747]  ? search_extable+0x22/0x30\n[76613.059649]  ? search_bpf_extables+0x5f/0x80\n[76613.063988]  ? exc_page_fault+0xa9/0x140\n[76613.067975]  ? asm_exc_page_fault+0x22/0x30\n[76613.072229]  ? xsk_map_delete_elem+0x2d/0x60\n[76613.076573]  ? xsk_map_delete_elem+0x23/0x60\n[76613.080914]  __sys_bpf+0x19b7/0x23c0\n[76613.084555]  __x64_sys_bpf+0x1a/0x20\n[76613.088194]  do_syscall_64+0x37/0xb0\n[76613.091832]  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n[76613.096962] RIP: 0033:0x7f80b6d1e88d\n[76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48\n[76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141\n[76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d\n[76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003\n[76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000\n[76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8\n[76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00\n---truncated---",
   id: "GHSA-v9jf-g2rr-85c3",
   modified: "2025-01-08T18:30:47Z",
   published: "2024-12-27T15:31:55Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-56614",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/d486b5741d987d3e0e6be4ac22cafdf94e6d1a47",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/ed08c93d5a9801cc8f224a046411fd603c538d07",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
         type: "CVSS_V3",
      },
   ],
}


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