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Date: Wed, 13 May 2020 11:45:05 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Miroslav Benes <mbenes@...e.cz>, Jann Horn <jannh@...gle.com>, Josh Poimboeuf <jpoimboe@...hat.com>, Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>, Dave Jones <dsj@...com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Vince Weaver <vincent.weaver@...ne.edu> Subject: [PATCH 4.19 39/48] x86/entry/64: Fix unwind hints in rewind_stack_do_exit() From: Jann Horn <jannh@...gle.com> commit f977df7b7ca45a4ac4b66d30a8931d0434c394b1 upstream. The LEAQ instruction in rewind_stack_do_exit() moves the stack pointer directly below the pt_regs at the top of the task stack before calling do_exit(). Tell the unwinder to expect pt_regs. Fixes: 8c1f75587a18 ("x86/entry/64: Add unwind hint annotations") Reviewed-by: Miroslav Benes <mbenes@...e.cz> Signed-off-by: Jann Horn <jannh@...gle.com> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com> Signed-off-by: Ingo Molnar <mingo@...nel.org> Cc: Andy Lutomirski <luto@...nel.org> Cc: Dave Jones <dsj@...com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Vince Weaver <vincent.weaver@...ne.edu> Link: https://lore.kernel.org/r/68c33e17ae5963854916a46f522624f8e1d264f2.1587808742.git.jpoimboe@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/x86/entry/entry_64.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1745,7 +1745,7 @@ ENTRY(rewind_stack_do_exit) movq PER_CPU_VAR(cpu_current_top_of_stack), %rax leaq -PTREGS_SIZE(%rax), %rsp - UNWIND_HINT_FUNC sp_offset=PTREGS_SIZE + UNWIND_HINT_REGS call do_exit END(rewind_stack_do_exit)
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