ghsa-w2r4-hcq9-mf2m
Vulnerability from github
Published
2024-06-25 15:31
Modified
2024-09-03 18:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

s390/ap: Fix crash in AP internal function modify_bitmap()

A system crash like this

Failing address: 200000cb7df6f000 TEID: 200000cb7df6f403 Fault in home space mode while using kernel ASCE. AS:00000002d71bc007 R3:00000003fe5b8007 S:000000011a446000 P:000000015660c13d Oops: 0038 ilc:3 [#1] PREEMPT SMP Modules linked in: mlx5_ib ... CPU: 8 PID: 7556 Comm: bash Not tainted 6.9.0-rc7 #8 Hardware name: IBM 3931 A01 704 (LPAR) Krnl PSW : 0704e00180000000 0000014b75e7b606 (ap_parse_bitmap_str+0x10e/0x1f8) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl GPRS: 0000000000000001 ffffffffffffffc0 0000000000000001 00000048f96b75d3 000000cb00000100 ffffffffffffffff ffffffffffffffff 000000cb7df6fce0 000000cb7df6fce0 00000000ffffffff 000000000000002b 00000048ffffffff 000003ff9b2dbc80 200000cb7df6fcd8 0000014bffffffc0 000000cb7df6fbc8 Krnl Code: 0000014b75e7b5fc: a7840047 brc 8,0000014b75e7b68a 0000014b75e7b600: 18b2 lr %r11,%r2 #0000014b75e7b602: a7f4000a brc 15,0000014b75e7b616

0000014b75e7b606: eb22d00000e6 laog %r2,%r2,0(%r13) 0000014b75e7b60c: a7680001 lhi %r6,1 0000014b75e7b610: 187b lr %r7,%r11 0000014b75e7b612: 84960021 brxh %r9,%r6,0000014b75e7b654 0000014b75e7b616: 18e9 lr %r14,%r9 Call Trace: [<0000014b75e7b606>] ap_parse_bitmap_str+0x10e/0x1f8 ([<0000014b75e7b5dc>] ap_parse_bitmap_str+0xe4/0x1f8) [<0000014b75e7b758>] apmask_store+0x68/0x140 [<0000014b75679196>] kernfs_fop_write_iter+0x14e/0x1e8 [<0000014b75598524>] vfs_write+0x1b4/0x448 [<0000014b7559894c>] ksys_write+0x74/0x100 [<0000014b7618a440>] __do_syscall+0x268/0x328 [<0000014b761a3558>] system_call+0x70/0x98 INFO: lockdep is turned off. Last Breaking-Event-Address: [<0000014b75e7b636>] ap_parse_bitmap_str+0x13e/0x1f8 Kernel panic - not syncing: Fatal exception: panic_on_oops

occured when /sys/bus/ap/a[pq]mask was updated with a relative mask value (like +0x10-0x12,+60,-90) with one of the numeric values exceeding INT_MAX.

The fix is simple: use unsigned long values for the internal variables. The correct checks are already in place in the function but a simple int for the internal variables was used with the possibility to overflow.

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2024-38661"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-25T15:15:13Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ap: Fix crash in AP internal function modify_bitmap()\n\nA system crash like this\n\n  Failing address: 200000cb7df6f000 TEID: 200000cb7df6f403\n  Fault in home space mode while using kernel ASCE.\n  AS:00000002d71bc007 R3:00000003fe5b8007 S:000000011a446000 P:000000015660c13d\n  Oops: 0038 ilc:3 [#1] PREEMPT SMP\n  Modules linked in: mlx5_ib ...\n  CPU: 8 PID: 7556 Comm: bash Not tainted 6.9.0-rc7 #8\n  Hardware name: IBM 3931 A01 704 (LPAR)\n  Krnl PSW : 0704e00180000000 0000014b75e7b606 (ap_parse_bitmap_str+0x10e/0x1f8)\n  R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\n  Krnl GPRS: 0000000000000001 ffffffffffffffc0 0000000000000001 00000048f96b75d3\n  000000cb00000100 ffffffffffffffff ffffffffffffffff 000000cb7df6fce0\n  000000cb7df6fce0 00000000ffffffff 000000000000002b 00000048ffffffff\n  000003ff9b2dbc80 200000cb7df6fcd8 0000014bffffffc0 000000cb7df6fbc8\n  Krnl Code: 0000014b75e7b5fc: a7840047            brc     8,0000014b75e7b68a\n  0000014b75e7b600: 18b2                lr      %r11,%r2\n  #0000014b75e7b602: a7f4000a            brc     15,0000014b75e7b616\n  \u003e0000014b75e7b606: eb22d00000e6        laog    %r2,%r2,0(%r13)\n  0000014b75e7b60c: a7680001            lhi     %r6,1\n  0000014b75e7b610: 187b                lr      %r7,%r11\n  0000014b75e7b612: 84960021            brxh    %r9,%r6,0000014b75e7b654\n  0000014b75e7b616: 18e9                lr      %r14,%r9\n  Call Trace:\n  [\u003c0000014b75e7b606\u003e] ap_parse_bitmap_str+0x10e/0x1f8\n  ([\u003c0000014b75e7b5dc\u003e] ap_parse_bitmap_str+0xe4/0x1f8)\n  [\u003c0000014b75e7b758\u003e] apmask_store+0x68/0x140\n  [\u003c0000014b75679196\u003e] kernfs_fop_write_iter+0x14e/0x1e8\n  [\u003c0000014b75598524\u003e] vfs_write+0x1b4/0x448\n  [\u003c0000014b7559894c\u003e] ksys_write+0x74/0x100\n  [\u003c0000014b7618a440\u003e] __do_syscall+0x268/0x328\n  [\u003c0000014b761a3558\u003e] system_call+0x70/0x98\n  INFO: lockdep is turned off.\n  Last Breaking-Event-Address:\n  [\u003c0000014b75e7b636\u003e] ap_parse_bitmap_str+0x13e/0x1f8\n  Kernel panic - not syncing: Fatal exception: panic_on_oops\n\noccured when /sys/bus/ap/a[pq]mask was updated with a relative mask value\n(like +0x10-0x12,+60,-90) with one of the numeric values exceeding INT_MAX.\n\nThe fix is simple: use unsigned long values for the internal variables. The\ncorrect checks are already in place in the function but a simple int for\nthe internal variables was used with the possibility to overflow.",
  "id": "GHSA-w2r4-hcq9-mf2m",
  "modified": "2024-09-03T18:31:31Z",
  "published": "2024-06-25T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38661"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2062e3f1f2374102f8014d7ca286b9aa527bd558"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c0bfb4e867c1ec6616a5049bd3618021e127056"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67011123453b91ec03671d40712fa213e94a01b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7360cef95aa1ea2b5efb7b5e2ed32e941664e1f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c72af16abf2ec7520407098360bbba312289e05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7dabe54a016defe11bb2a278cd9f1ff6db3feba6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c5f5911c1b13170d3404eb992c6a0deaa8d81ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4f9d5a99a3fd1b1c691b7a1a6f8f3f25f4116c9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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