[Bug libc/22396] New: siglongjmp does not restore PKRU register

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22396

            Bug ID: 22396
           Summary: siglongjmp does not restore PKRU register
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
            Target: x86-64

When a signal handler is left using siglongjmp, the PKRU value is not restored.
 This is problematic because the signal handler has access to all memory
protection keys disabled.

The application may not be able to save and restore the protection bits for all
keys because the kernel API does not actually specify that the set of keys is a
small, fixed set.

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