From: Andy Lutomirski <luto@amacapital.net>
To: "H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
x86@kernel.org, Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Subject: [PATCH 1/2] x86_64,entry,xen: Do not invoke espfix64 on Xen
Date: Wed, 23 Jul 2014 08:34:11 -0700 [thread overview]
Message-ID: <7b8f1d8ef6597cb16ae004a43c56980a7de3cf94.1406129132.git.luto@amacapital.net> (raw)
In-Reply-To: <cover.1406129131.git.luto@amacapital.net>
In-Reply-To: <cover.1406129131.git.luto@amacapital.net>
This moves the espfix64 logic into native_iret. To make this work,
it gets rid of the native patch for INTERRUPT_RETURN:
INTERRUPT_RETURN on native kernels is now 'jmp native_iret'.
This changes the 16-bit SS behavior on Xen from OOPSing to leaking
some bits of the Xen hypervisor's RSP (I think).
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
---
arch/x86/include/asm/irqflags.h | 2 +-
arch/x86/kernel/entry_64.S | 28 ++++++++++------------------
arch/x86/kernel/paravirt_patch_64.c | 2 --
3 files changed, 11 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
index bba3cf8..0a8b519 100644
--- a/arch/x86/include/asm/irqflags.h
+++ b/arch/x86/include/asm/irqflags.h
@@ -129,7 +129,7 @@ static inline notrace unsigned long arch_local_irq_save(void)
#define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */
-#define INTERRUPT_RETURN iretq
+#define INTERRUPT_RETURN jmp native_iret
#define USERGS_SYSRET64 \
swapgs; \
sysretq;
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index b25ca96..c844f08 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -830,27 +830,24 @@ restore_args:
RESTORE_ARGS 1,8,1
irq_return:
+ INTERRUPT_RETURN
+
+ENTRY(native_iret)
/*
* Are we returning to a stack segment from the LDT? Note: in
* 64-bit mode SS:RSP on the exception stack is always valid.
*/
#ifdef CONFIG_X86_ESPFIX64
testb $4,(SS-RIP)(%rsp)
- jnz irq_return_ldt
+ jnz native_irq_return_ldt
#endif
-irq_return_iret:
- INTERRUPT_RETURN
- _ASM_EXTABLE(irq_return_iret, bad_iret)
-
-#ifdef CONFIG_PARAVIRT
-ENTRY(native_iret)
+native_irq_return_iret:
iretq
- _ASM_EXTABLE(native_iret, bad_iret)
-#endif
+ _ASM_EXTABLE(native_irq_return_iret, bad_iret)
#ifdef CONFIG_X86_ESPFIX64
-irq_return_ldt:
+native_irq_return_ldt:
pushq_cfi %rax
pushq_cfi %rdi
SWAPGS
@@ -872,7 +869,7 @@ irq_return_ldt:
SWAPGS
movq %rax,%rsp
popq_cfi %rax
- jmp irq_return_iret
+ jmp native_irq_return_iret
#endif
.section .fixup,"ax"
@@ -956,13 +953,8 @@ __do_double_fault:
cmpl $__KERNEL_CS,CS(%rdi)
jne do_double_fault
movq RIP(%rdi),%rax
- cmpq $irq_return_iret,%rax
-#ifdef CONFIG_PARAVIRT
- je 1f
- cmpq $native_iret,%rax
-#endif
+ cmpq $native_irq_return_iret,%rax
jne do_double_fault /* This shouldn't happen... */
-1:
movq PER_CPU_VAR(kernel_stack),%rax
subq $(6*8-KERNEL_STACK_OFFSET),%rax /* Reset to original stack */
movq %rax,RSP(%rdi)
@@ -1428,7 +1420,7 @@ error_sti:
*/
error_kernelspace:
incl %ebx
- leaq irq_return_iret(%rip),%rcx
+ leaq native_irq_return_iret(%rip),%rcx
cmpq %rcx,RIP+8(%rsp)
je error_swapgs
movl %ecx,%eax /* zero extend */
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index 3f08f34..a1da673 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -6,7 +6,6 @@ DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
-DEF_NATIVE(pv_cpu_ops, iret, "iretq");
DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
@@ -50,7 +49,6 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
PATCH_SITE(pv_irq_ops, save_fl);
PATCH_SITE(pv_irq_ops, irq_enable);
PATCH_SITE(pv_irq_ops, irq_disable);
- PATCH_SITE(pv_cpu_ops, iret);
PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
PATCH_SITE(pv_cpu_ops, usergs_sysret32);
PATCH_SITE(pv_cpu_ops, usergs_sysret64);
--
1.9.3
next prev parent reply other threads:[~2014-07-23 15:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-23 15:34 [PATCH 0/2] x86_64: LRET to userspace Andy Lutomirski
2014-07-23 15:34 ` Andy Lutomirski [this message]
2014-07-28 22:33 ` [tip:x86/urgent] x86_64/entry/xen: Do not invoke espfix64 on Xen tip-bot for Andy Lutomirski
2014-07-29 3:39 ` Andy Lutomirski
2014-07-29 3:47 ` H. Peter Anvin
2014-07-23 15:34 ` [PATCH 2/2] x86_64,entry: Use lret to return to userspace when possible Andy Lutomirski
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