m68k: Only force 030 bus error if PC not in exception table
Published Dec 30, 2025
No CVSS score
EPSS 0.21%
Description
__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.
Affected products
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- Version 2.6.18StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<2.6.18
- Version 4.14.312StatusunaffectedConstraints<=4.14.*
- Version 4.19.280StatusunaffectedConstraints<=4.19.*
- Version 5.10.177StatusunaffectedConstraints<=5.10.*
- Version 5.15.105StatusunaffectedConstraints<=5.15.*
- Version 5.4.240StatusunaffectedConstraints<=5.4.*
- Version 6.1.22StatusunaffectedConstraints<=6.1.*
- Version 6.2.9StatusunaffectedConstraints<=6.2.*
- Version 6.3StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
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| Linux | Linux | affected |
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No data.
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
No CWE recorded.
References (14)
- https://access.redhat.com/security/cve/CVE-2023-54232 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2426060 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-60409 Advisory
- https://git.kernel.org/stable/c/1a6059f5ed57f48edfe7159404ff7d538d9d405b
- https://git.kernel.org/stable/c/2100e374251a8fc00cce1916cfc50f3cb652cbe3
- https://git.kernel.org/stable/c/54fa25ffab2b700df5abd58c136d64a912c53953
- https://git.kernel.org/stable/c/8bf8d5dade4c5e1d8a2386f29253ed28b5d87735
- https://git.kernel.org/stable/c/df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8
- https://git.kernel.org/stable/c/e36a82bebbf7da814530d5a179bef9df5934b717
- https://git.kernel.org/stable/c/ec15405b80fc15ffc87a23d01378ae061c1aba07
- https://git.kernel.org/stable/c/f55cb52ec98b22125f5bda36391edb8894f7e8cf
- https://lore.kernel.org/linux-cve-announce/2025123031-CVE-2023-54232-48af@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2023-54232
- https://www.cve.org/CVERecord?id=CVE-2023-54232
Change history (0)
No recorded changes yet.