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A comment on Intel’s first Optane SSD: 375GB that you can also use as RAM. Parent comment

Re:Intel’s first Optane SSD: 375GB that you can also use as RAM by viraptor on Monday March 20, 2017 @03:16AM (#13912358)
Kind of... We solved this issue like 35 years ago and then broke it again in the last decade. First CPU timing attacks allowed peeking at secret key generation in shared environments. Then we got rowhammer which ignores your mapping. Now we got memory access timing attacks which allow probing kernel memory mapping and bypassing ASLR.

While you can't easily write into other processes anymore, the barrier is more of a suggestion again.

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Re:Intel’s first Optane SSD: 375GB that you can also use as RAM by hatsunearu on Monday March 20, 2017 @08:26PM (#13918845)
"ignores your mapping" is pretty generous considering rowhammer doesn't work on ECC RAM.
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Re:Intel’s first Optane SSD: 375GB that you can also use as RAM by viraptor on Tuesday March 21, 2017 @05:43AM (#13920848)
From https://en.m.wikipedia.org/wiki/Row_hammer

> Tests show that simple ECC solutions, providing single-error correction and double-error detection (SECDED) capabilities, are not able to correct or detect all observed disturbance errors because some of them include more than two flipped bits per memory word

But anyway - even if ECC was perfect at preventing the issue, lots of hosts do not use ECC. That includes practically every desktop.

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