Security Now 412

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Security Now
Episode 412

Contents

Security Now 412: SSL and Perfect Forward Secrecy

News & Errata

  • Explanation of resetting through the keyboard controller: The IBM PC-AT, as Steve noted is based on the 80286, has real mode and protected mode. Once that particular processor is put into protected mode, the only way back to real mode is to strobe the reset pin on the processor. Just like the mentioned A20 address line hack/kludge, a bit on the keyboard controller was designated for strobing the reset line; it's basically in the ISA standard. The only deficiency Steve and his Spinrite user found was that some systems did not properly implement the readout of the state of the zeroth bit, so if one simply sets the A20 bit they want it, and returns whatever was in bit 0 back as it was, the system would then reset as Steve noted. It's nothing particularly new or undocumented, just fairly obscure. Linux for example has a "reboot" option when booting the kernel (a command line option) which specified "hard" to perform that hard reset by exercising that bit. (Other options to do that include using EFI, BIOS, ACPI, or APM, as well as to do either a cold or warm restart.)

Spinrite Story

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Notable Quotes

Significant Products

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Sponsors

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