CVE-2024-26706 (GCVE-0-2024-26706)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:55 – Updated: 2026-01-05 10:34
VLAI?
Title
parisc: Fix random data corruption from exception handler
Summary
In the Linux kernel, the following vulnerability has been resolved: parisc: Fix random data corruption from exception handler The current exception handler implementation, which assists when accessing user space memory, may exhibit random data corruption if the compiler decides to use a different register than the specified register %r29 (defined in ASM_EXCEPTIONTABLE_REG) for the error code. If the compiler choose another register, the fault handler will nevertheless store -EFAULT into %r29 and thus trash whatever this register is used for. Looking at the assembly I found that this happens sometimes in emulate_ldd(). To solve the issue, the easiest solution would be if it somehow is possible to tell the fault handler which register is used to hold the error code. Using %0 or %1 in the inline assembly is not posssible as it will show up as e.g. %r29 (with the "%r" prefix), which the GNU assembler can not convert to an integer. This patch takes another, better and more flexible approach: We extend the __ex_table (which is out of the execution path) by one 32-word. In this word we tell the compiler to insert the assembler instruction "or %r0,%r0,%reg", where %reg references the register which the compiler choosed for the error return code. In case of an access failure, the fault handler finds the __ex_table entry and can examine the opcode. The used register is encoded in the lowest 5 bits, and the fault handler can then store -EFAULT into this register. Since we extend the __ex_table to 3 words we can't use the BUILDTIME_TABLE_SORT config option any longer.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d19f5e41b344a057bb2450024a807476f30978d2 , < 23027309b099ffc4efca5477009a11dccbdae592 (git)
Affected: d19f5e41b344a057bb2450024a807476f30978d2 , < fa69a8063f8b27f3c7434a0d4f464a76a62f24d2 (git)
Affected: d19f5e41b344a057bb2450024a807476f30978d2 , < ce31d79aa1f13a2345791f84935281a2c194e003 (git)
Affected: d19f5e41b344a057bb2450024a807476f30978d2 , < 8b1d72395635af45410b66cc4c4ab37a12c4a831 (git)
Affected: 09b931fcb87c8aad178475a7db1d4bfc939f7faa (git)
Affected: 37e6234297379e0db25e39c2ca99776fea70026c (git)
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    Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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