Steven Ward planet36

## xz-backdoor.md

      
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                thesamesam
                / xz-backdoor.md
            
            
              Last active
              June 26, 2024 16:04
            
              
                xz-utils backdoor situation (CVE-2024-3094)
              
          
    FAQ on the xz-utils backdoor (CVE-2024-3094)

This is a living document. Everything in this document is made in good
faith of being accurate, but like I just said; we don't yet know everything
about what's going on.
Background

On March 29th, 2024, a backdoor was discovered in
xz-utils, a suite of software that

  
## rng.cpp
constexpr uint32_t hash(uint32_t in)
{
	constexpr uint32_t r[]{
		0xdf15236c, 0x16d16793, 0x3a697614, 0xe0fe08e4,
		0xa3a53275, 0xccc10ff9, 0xb92fae55, 0xecf491de,
		0x36e86773, 0x0ed24a6a, 0xd7153d80, 0x84adf386,
		0x17110e76, 0x6d411a6a, 0xcbd41fed, 0x4b1d6b30
	};
	uint32_t out{ in ^ r[in & 0xF] };
	out ^= std::rotl(in, 020) ^ r[(in >> 010) & 0xF];

## DellXPS15_9560_AHCI_RAID.md

      
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                chenxiaolong
                / DellXPS15_9560_AHCI_RAID.md
            
            
              Created
              November 27, 2017 01:33
            
              
                Switching between AHCI and RAID on the Dell XPS 15 (9560)
              
          
    Switching between AHCI and RAID on the Dell XPS 15 (9560)

This guide likely applies to other models and, potentially, even laptops from other OEMs that have NVME drives. However, I've only tested this on my Dell XPS 15 (9560) with the OEM Windows installation from the Signature Edition model.
Switching from RAID to AHCI

Switching from RAID to AHCI is significantly simpler than switching from AHCI to RAID. All that's needed is a successful boot to Safe Mode.

To set the default boot mode to Safe Mode, use msconfig.exe or open an admin cmd/PowerShell window and run:
	constexpr uint32_t hash(uint32_t in)
	{
	constexpr uint32_t r[]{
	0xdf15236c, 0x16d16793, 0x3a697614, 0xe0fe08e4,
	0xa3a53275, 0xccc10ff9, 0xb92fae55, 0xecf491de,
	0x36e86773, 0x0ed24a6a, 0xd7153d80, 0x84adf386,
	0x17110e76, 0x6d411a6a, 0xcbd41fed, 0x4b1d6b30
	};
	uint32_t out{ in ^ r[in & 0xF] };
	out ^= std::rotl(in, 020) ^ r[(in >> 010) & 0xF];