Description
In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Instruction access rights) occurs, this means the CPU couldn't execute an instruction due to missing execute permissions on the memory region. In this case it seems the CPU didn't even fetched the instruction from memory and thus did not store it in the cr19 (IIR) register before calling the trap handler. So, the trap handler will find some random old stale value in cr19. This patch simply overwrites the stale IIR value with a constant magic "bad food" value (0xbaadf00d), in the hope people don't start to try to understand the various random IIR values in trap 7 dumps.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d01e9ce1af6116f812491d3d3873d204f10ae0b8affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e96373f0a5f484bc1e193f9951dcb3adf24bf3f7affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 484730e5862f6b872dca13840bed40fd7c60fa26affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.90 to ≤ 5.10.*unaffected5.15.13 to ≤ 5.15.*unaffected5.16 to ≤ *unaffected