From: Kyle Huey <me@xxxxxxxxxxxx> commit d7e5aceace51 upstream The hardware XRSTOR instruction resets the PKRU register to its hardware init value (namely 0) if the PKRU bit is not set in the xfeatures mask. Emulating that here restores the pre-5.14 behavior for PTRACE_SET_REGSET with NT_X86_XSTATE, and makes sigreturn (which still uses XRSTOR) and behave identically. Fixes: e84ba47e313d ("x86/fpu: Hook up PKRU into ptrace()") Signed-off-by: Kyle Huey <me@xxxxxxxxxxxx> Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/all/20221115230932.7126-6-khuey%40kylehuey.com --- arch/x86/kernel/fpu/xstate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index fe9050c60adc..8bbf37c0bebe 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1168,7 +1168,8 @@ static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf, xpkru = __raw_xsave_addr(xsave, XFEATURE_PKRU); *pkru = xpkru->pkru; - } + } else + *pkru = 0; /* * The state that came in from userspace was user-state only. -- 2.25.1