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Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86/pti update from Thomas Gleixner:
 "Just a single change from the anti-performance departement:

   - Add a new PR_SPEC_DISABLE_NOEXEC option which allows to apply the
     speculation protections on a process without inheriting the state
     on exec.

     This remedies a situation where a Java-launcher has speculation
     protections enabled because that's the default for JVMs which
     causes the launched regular harmless processes to inherit the
     protection state which results in unintended performance
     degradation"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/speculation: Add PR_SPEC_DISABLE_NOEXEC
This commit is contained in:
Linus Torvalds
2019-03-05 12:50:34 -08:00
parent 78f8601354 71368af902
commit edaed168e1
6 changed files with 46 additions and 12 deletions
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include/uapi/linux/prctl.h
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@@ -219,6 +219,7 @@ struct prctl_mm_map {
# define PR_SPEC_ENABLE (1UL << 1)
# define PR_SPEC_DISABLE (1UL << 2)
# define PR_SPEC_FORCE_DISABLE (1UL << 3)
# define PR_SPEC_DISABLE_NOEXEC (1UL << 4)
/* Reset arm64 pointer authentication keys */
#define PR_PAC_RESET_KEYS 54