Domain: osdev.org
Stories and comments across the archive that link to osdev.org.
Stories · 3
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'Kernel Memory Leaking' Intel Processor Design Flaw Forces Linux, Windows Redesign (theregister.co.uk)
According to The Register, "A fundamental design flaw in Intel's processor chips has forced a significant redesign of the Linux and Windows kernels to defang the chip-level security bug." From the report: Programmers are scrambling to overhaul the open-source Linux kernel's virtual memory system. Meanwhile, Microsoft is expected to publicly introduce the necessary changes to its Windows operating system in this month's Patch Tuesday: these changes were seeded to beta testers running fast-ring Windows Insider builds in November and December. Crucially, these updates to both Linux and Windows will incur a performance hit on Intel products. The effects are still being benchmarked, however we're looking at a ballpark figure of five to 30 per cent slow down, depending on the task and the processor model. More recent Intel chips have features -- specifically, PCID -- to reduce the performance hit. Similar operating systems, such as Apple's 64-bit macOS, will also need to be updated -- the flaw is in the Intel x86 hardware, and it appears a microcode update can't address it. It has to be fixed in software at the OS level, or buy a new processor without the design blunder. Details of the vulnerability within Intel's silicon are under wraps: an embargo on the specifics is due to lift early this month, perhaps in time for Microsoft's Patch Tuesday next week. Indeed, patches for the Linux kernel are available for all to see but comments in the source code have been redacted to obfuscate the issue. The report goes on to share some details of the flaw that have surfaced. "It is understood the bug is present in modern Intel processors produced in the past decade," reports The Register. "It allows normal user programs -- from database applications to JavaScript in web browsers -- to discern to some extent the contents of protected kernel memory. The fix is to separate the kernel's memory completely from user processes using what's called Kernel Page Table Isolation, or KPTI." -
DNS based Website Failover Solutions?
Chase asks: "I run a couple of websites(including for my work). I'd like to have a backup web server that people would hit when my server goes down. My primary host is on my companies T1 line and even though I've had my server die once the most common reason for my sites to be offline is that our T1 goes down. I've looked at the High-Availability Linux Project but it seems that almost everything there is for failover using ip takeover which isn't an option if my network link dies and my backup server is on a different network. ZoneEdit seems to offer what I'm looking for but I'm wanting a do it myself solution. The only software I've found is Eddie and it seems to have stopped development around 2000. I know DNS based failover doesn't give 100% uptime but with a low cache time and decent monitoring it seems like it's the best solution for having my backup server at a differnt location and on a differnt network. Anyone know of a good solution? (Using Linux and/or Solaris hosts)" -
SMS vs. E-mail?
Chase asks: "I have a Motorola I85s (Java phones rock!). The issue I've run into is that from what I've been able to find out, most phones overseas (I'm in the US) support SMS to send text messages between mobile devices. Also alot of two-way devices are now popping up in the US. Nextel (my service provider) only lets me use SMS to other Nextel customers. Their two messaging service is e-mail based. So I end up using a web site to send SMS messages to my friends overseas but we'd really like to send directly each others phones. Is this just a problem with Nextel or do all mobile phone companies in the US have this issue? Are most of the current crop of two-way devices coming out in the US email based, SMS, or something else?""All of you anti-Microsoft people would probably like to know that if you have Nextels national plan and a I85s you get the ability to send and recieve from a Hotmail or MSN account for free. I'm paying $5 a month for the regular email support. I read something about MSN only supporting non-standard protocols for email, do we also have to worry about Microsoft messing with moble messaging? (and yes, I have a Passport option on my phone)"