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- Add EPERM to the possible PR_SET_SPECULATION_CTRL pr_ctl() error codes 

to "legitimize" it
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Merge tag 'x86_bugs_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 bug documentation update from Borislav Petkov:

 - Add EPERM to the possible PR_SET_SPECULATION_CTRL pr_ctl() error
   codes to "legitimize" it

* tag 'x86_bugs_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation/x86: Fix PR_SET_SPECULATION_CTRL error codes
This commit is contained in:
Linus Torvalds 2026-02-10 18:23:47 -08:00
parent d1953aa3bc 4992ed7813
commit 75b2a60367
1 changed files with 8 additions and 4 deletions
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12
Documentation/userspace-api/spec_ctrl.rst
View File

@ -81,11 +81,15 @@ Value Meaning
ERANGE arg3 is incorrect, i.e. it's neither PR_SPEC_ENABLE nor
PR_SPEC_DISABLE nor PR_SPEC_FORCE_DISABLE.
ENXIO Control of the selected speculation misfeature is not possible.
See PR_GET_SPECULATION_CTRL.
ENXIO For PR_SPEC_STORE_BYPASS: control of the selected speculation misfeature
is not possible via prctl, because of the system's boot configuration.
EPERM Speculation was disabled with PR_SPEC_FORCE_DISABLE and caller tried to
enable it again.
EPERM For PR_SPEC_L1D_FLUSH and PR_SPEC_INDIRECT_BRANCH: control of the
mitigation is not possible because of the system's boot configuration.
EPERM Speculation was disabled with PR_SPEC_FORCE_DISABLE and caller
tried to enable it again.
======= =================================================================
Speculation misfeature controls