CVE-2024-26706

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd19f5e41b344a057bb2450024a807476f30978d2 < 23027309b099ffc4efca5477009a11dccbdae592affected
LinuxLinuxd19f5e41b344a057bb2450024a807476f30978d2 < fa69a8063f8b27f3c7434a0d4f464a76a62f24d2affected
LinuxLinuxd19f5e41b344a057bb2450024a807476f30978d2 < ce31d79aa1f13a2345791f84935281a2c194e003affected
LinuxLinuxd19f5e41b344a057bb2450024a807476f30978d2 < 8b1d72395635af45410b66cc4c4ab37a12c4a831affected
LinuxLinux09b931fcb87c8aad178475a7db1d4bfc939f7faaaffected
LinuxLinux37e6234297379e0db25e39c2ca99776fea70026caffected
LinuxLinux4.9.21 < 4.10affected
LinuxLinux4.10.9 < 4.11affected
LinuxLinux4.11affected
LinuxLinux0 < 4.11unaffected
LinuxLinux6.1.79 <= 6.1.*unaffected
LinuxLinux6.6.18 <= 6.6.*unaffected
LinuxLinux6.7.6 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References