2.Motherboard

While relevant Intel and AMD processors have been mitigated for the recent Retbleed security vulnerability affecting older generations of processors, those mitigations currently just work for x86_64 kernels and will not work if running an x86 (32-bit) kernel on affected hardware. But it's unlikely to get fixed unless some passionate individual steps up as the upstream developers and vendors have long since moved on to just caring about x86_64.


Last week following the flurry of Linux patches for mitigating this newest speculative execution attack, it was pointed out that Linux x86 32-bit kernels are still vulnerable to Retbleed. It turns out Linaro still has a 32-bit Debian box in their functional test farm and they //lore.kernel.org/lkml/[email protected]om/" style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: sans-serif, droid-sans, arial, Tahoma; vertical-align: baseline; color: rgb(52, 135, 85); text-decoration: none; transition: color 0.3s ease 0s; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);">noted that even with a patched kernel their i386 kernel was still vulnerable to Retbleed attacks.

 

Second-in-command Linux kernel developer Greg Kroah-Hartman //lore.kernel.org/lkml/Ys%[email protected]/" style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: sans-serif, droid-sans, arial, Tahoma; vertical-align: baseline; color: rgb(52, 135, 85); text-decoration: none; transition: color 0.3s ease 0s; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);">responded, "That's funny. I don't think that's a valid combination that should be cared about, but I'll leave it to Pawan [of Intel] to comment if it is something that is "real" to be concerned for.