• Sebastian Andrzej Siewior's avatar
    x86/pkeys: Add PKRU value to init_fpstate · a5eff725
    Sebastian Andrzej Siewior authored
    The task's initial PKRU value is set partly for fpu__clear()/
    copy_init_pkru_to_fpregs(). It is not part of init_fpstate.xsave and
    instead it is set explicitly.
    
    If the user removes the PKRU state from XSAVE in the signal handler then
    __fpu__restore_sig() will restore the missing bits from `init_fpstate'
    and initialize the PKRU value to 0.
    
    Add the `init_pkru_value' to `init_fpstate' so it is set to the init
    value in such a case.
    
    In theory copy_init_pkru_to_fpregs() could be removed because restoring
    the PKRU at return-to-userland should be enough.
    Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
    Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
    Reviewed-by: default avatarDave Hansen <dave.hansen@intel.com>
    Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
    Cc: Dominik Brodowski <linux@dominikbrodowski.net>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: kvm ML <kvm@vger.kernel.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Radim Krčmář <rkrcmar@redhat.com>
    Cc: Rik van Riel <riel@surriel.com>
    Cc: x86-ml <x86@kernel.org>
    Link: https://lkml.kernel.org/r/20190403164156.19645-28-bigeasy@linutronix.de
    a5eff725
pkeys.c 6.22 KB