ghsa-c7qr-fxvv-x4fh
Vulnerability from github
Published
2025-03-27 18:31
Modified
2025-04-01 15:31
Details

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

s390: workaround invalid gcc-11 out of bounds read warning

GCC 11.1.0 and 11.2.0 generate a wrong warning when compiling the kernel e.g. with allmodconfig:

arch/s390/kernel/setup.c: In function ‘setup_lowcore_dat_on’: ./include/linux/fortify-string.h:57:33: error: ‘__builtin_memcpy’ reading 128 bytes from a region of size 0 [-Werror=stringop-overread] ... arch/s390/kernel/setup.c:526:9: note: in expansion of macro ‘memcpy’ 526 | memcpy(abs_lc->cregs_save_area, S390_lowcore.cregs_save_area, | ^~~~~~

This could be addressed by using absolute_pointer() with the S390_lowcore macro, but this is not a good idea since this generates worse code for performance critical paths.

Therefore simply use a for loop to copy the array in question and get rid of the warning.

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{
  "affected": [],
  "aliases": [
    "CVE-2023-52990"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-27T17:15:46Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390: workaround invalid gcc-11 out of bounds read warning\n\nGCC 11.1.0 and 11.2.0 generate a wrong warning when compiling the\nkernel e.g. with allmodconfig:\n\narch/s390/kernel/setup.c: In function \u2018setup_lowcore_dat_on\u2019:\n./include/linux/fortify-string.h:57:33: error: \u2018__builtin_memcpy\u2019 reading 128 bytes from a region of size 0 [-Werror=stringop-overread]\n...\narch/s390/kernel/setup.c:526:9: note: in expansion of macro \u2018memcpy\u2019\n  526 |         memcpy(abs_lc-\u003ecregs_save_area, S390_lowcore.cregs_save_area,\n      |         ^~~~~~\n\nThis could be addressed by using absolute_pointer() with the\nS390_lowcore macro, but this is not a good idea since this generates\nworse code for performance critical paths.\n\nTherefore simply use a for loop to copy the array in question and get\nrid of the warning.",
  "id": "GHSA-c7qr-fxvv-x4fh",
  "modified": "2025-04-01T15:31:29Z",
  "published": "2025-03-27T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52990"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fc24f9da259b675c3cc74ad5aa92dac286543b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e1992665a2701fa025a8b76970c43b4148446f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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