Commit-ID: e62a254a1f93fcc7299497a5c7231639400b8c3c Gitweb: http://git.kernel.org/tip/e62a254a1f93fcc7299497a5c7231639400b8c3c Author: Andy Lutomirski <luto@xxxxxxxxxx> AuthorDate: Mon, 5 Oct 2015 17:48:02 -0700 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Fri, 9 Oct 2015 09:41:07 +0200 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@xxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx Link: http://lkml.kernel.org/r/8d6e84bf651519289dc532dcc230adfabbd2a3eb.1444091584.git.luto@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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 bc678f0..06a8966 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) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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