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Message-Id: <8d6e84bf651519289dc532dcc230adfabbd2a3eb.1444091584.git.luto@kernel.org> Date: Mon, 5 Oct 2015 17:48:02 -0700 From: Andy Lutomirski <luto@...nel.org> To: x86@...nel.org, linux-kernel@...r.kernel.org Cc: Brian Gerst <brgerst@...il.com>, Denys Vlasenko <dvlasenk@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org> Subject: [PATCH v2 14/36] 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@...nel.org> --- arch/x86/entry/entry_64_compat.S | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 1432d60a1f4a..e11aa38696fe 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -103,6 +103,14 @@ ENTRY(entry_SYSENTER_compat) jnz sysenter_fix_flags sysenter_flags_fixed: + /* Temporary: SYSENTER is disabled. */ +#ifdef CONFIG_CONTEXT_TRACKING + call enter_from_user_mode +#endif + ENABLE_INTERRUPTS(CLBR_NONE) + movl $11, %edi + call do_exit + /* * Re-enable interrupts. IRQ tracing already thinks that IRQs are * on (since we treat user mode as having IRQs on), and the @@ -324,6 +332,11 @@ ENTRY(entry_SYSCALL_compat) * it is too small to ever cause noticeable irq latency. */ SWAPGS_UNSAFE_STACK + + /* Temporary: SYSCALL32 is disabled. */ + movl $-ENOSYS, %eax + USERGS_SYSRET32 + movl %esp, %r8d movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp ENABLE_INTERRUPTS(CLBR_NONE) -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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