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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1745564
Title:
coding error in retpoline for system call entry in Ubuntu 4.13.0-31
kernels
Status in linux package in Ubuntu:
Incomplete
Bug description:
Logic error came from the following commit, looks to be introduced at
4.13.0-27:
commit d2e0236f395e876f5303fb5021e4fe6eea881402
Author: Tim Chen <[email protected]>
Date: Wed Nov 8 16:30:06 2017 -0800
x86/entry: Use retpoline for syscall's indirect calls
$ git describe --contains d2e0236f395e876f5303fb5021e4fe6eea881402
Ubuntu-4.13.0-27.30~42
This patch was included in one of the proposed patchsets to mitigate
spectre, but was superceded in later ones which did not contain the
error, and did not land in the upstream kernel. It does not affect the
4.4 derived or earlier kernels.
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