CVE-2023-54232 (GCVE-0-2023-54232)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2025-12-30 12:11
VLAI?
Title
m68k: Only force 030 bus error if PC not in exception table
Summary
In the Linux kernel, the following vulnerability has been resolved: m68k: Only force 030 bus error if PC not in exception table __get_kernel_nofault() does copy data in supervisor mode when forcing a task backtrace log through /proc/sysrq_trigger. This is expected cause a bus error exception on e.g. NULL pointer dereferencing when logging a kernel task has no workqueue associated. This bus error ought to be ignored. Our 030 bus error handler is ill equipped to deal with this: Whenever ssw indicates a kernel mode access on a data fault, we don't even attempt to handle the fault and instead always send a SEGV signal (or panic). As a result, the check for exception handling at the fault PC (buried in send_sig_fault() which gets called from do_page_fault() eventually) is never used. In contrast, both 040 and 060 access error handlers do not care whether a fault happened on supervisor mode access, and will call do_page_fault() on those, ultimately honoring the exception table. Add a check in bus_error030 to call do_page_fault() in case we do have an entry for the fault PC in our exception table. I had attempted a fix for this earlier in 2019 that did rely on testing pagefault_disabled() (see link below) to achieve the same thing, but this patch should be more generic. Tested on 030 Atari Falcon.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1a6059f5ed57f48edfe7159404ff7d538d9d405b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f55cb52ec98b22125f5bda36391edb8894f7e8cf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2100e374251a8fc00cce1916cfc50f3cb652cbe3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8bf8d5dade4c5e1d8a2386f29253ed28b5d87735 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 54fa25ffab2b700df5abd58c136d64a912c53953 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ec15405b80fc15ffc87a23d01378ae061c1aba07 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e36a82bebbf7da814530d5a179bef9df5934b717 (git)
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    Linux Linux Unaffected: 4.14.312 , ≤ 4.14.* (semver)
Unaffected: 4.19.280 , ≤ 4.19.* (semver)
Unaffected: 5.4.240 , ≤ 5.4.* (semver)
Unaffected: 5.10.177 , ≤ 5.10.* (semver)
Unaffected: 5.15.105 , ≤ 5.15.* (semver)
Unaffected: 6.1.22 , ≤ 6.1.* (semver)
Unaffected: 6.2.9 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nm68k: Only force 030 bus error if PC not in exception table\n\n__get_kernel_nofault() does copy data in supervisor mode when\nforcing a task backtrace log through /proc/sysrq_trigger.\nThis is expected cause a bus error exception on e.g. NULL\npointer dereferencing when logging a kernel task has no\nworkqueue associated. This bus error ought to be ignored.\n\nOur 030 bus error handler is ill equipped to deal with this:\n\nWhenever ssw indicates a kernel mode access on a data fault,\nwe don\u0027t even attempt to handle the fault and instead always\nsend a SEGV signal (or panic). As a result, the check\nfor exception handling at the fault PC (buried in\nsend_sig_fault() which gets called from do_page_fault()\neventually) is never used.\n\nIn contrast, both 040 and 060 access error handlers do not\ncare whether a fault happened on supervisor mode access,\nand will call do_page_fault() on those, ultimately honoring\nthe exception table.\n\nAdd a check in bus_error030 to call do_page_fault() in case\nwe do have an entry for the fault PC in our exception table.\n\nI had attempted a fix for this earlier in 2019 that did rely\non testing pagefault_disabled() (see link below) to achieve\nthe same thing, but this patch should be more generic.\n\nTested on 030 Atari Falcon."
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    "dateReserved": "2025-12-30T12:06:44.502Z",
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}


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