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x86/entry/64/compat: Disable SYSENTER and SYSCALL32 entries
We've disabled the vDSO helpers to call them, so turn off the entries entirely (temporarily) in preparation for cleaning them up. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/8d6e84bf651519289dc532dcc230adfabbd2a3eb.1444091584.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -103,6 +103,14 @@ ENTRY(entry_SYSENTER_compat)
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jnz sysenter_fix_flags
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sysenter_flags_fixed:
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/* Temporary: SYSENTER is disabled. */
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#ifdef CONFIG_CONTEXT_TRACKING
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call enter_from_user_mode
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#endif
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl $11, %edi
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call do_exit
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/*
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* Re-enable interrupts. IRQ tracing already thinks that IRQs are
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* on (since we treat user mode as having IRQs on), and the
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@ -324,6 +332,11 @@ ENTRY(entry_SYSCALL_compat)
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* it is too small to ever cause noticeable irq latency.
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*/
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SWAPGS_UNSAFE_STACK
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/* Temporary: SYSCALL32 is disabled. */
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movl $-ENOSYS, %eax
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USERGS_SYSRET32
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movl %esp, %r8d
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movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
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ENABLE_INTERRUPTS(CLBR_NONE)
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