From: Andi Kleen <andi@firstfloor.org>
To: tglx@linutronix.de
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org, dwmw@amazon.co.uk, pjt@google.com,
luto@kernel.org, peterz@infradead.org, thomas.lendacky@amd.com,
tim.c.chen@linux.intel.com, gregkh@linux-foundation.org,
dave.hansen@intel.com, jikos@kernel.org,
Andi Kleen <ak@linux.intel.com>
Subject: [PATCH v1 4/8] x86/entry/retpoline: Clear extra registers for compat syscalls
Date: Tue, 9 Jan 2018 17:03:24 -0800 [thread overview]
Message-ID: <20180110010328.22163-5-andi@firstfloor.org> (raw)
In-Reply-To: <20180110010328.22163-1-andi@firstfloor.org>
From: Andi Kleen <ak@linux.intel.com>
Clear all registers for compat calls on 64bit kernels. All arguments
are initially passed through the stack, so this is fairly simple
without additional stubs.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/entry/entry_64_compat.S | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 98d5358e4041..16fd2643a77f 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -95,6 +95,8 @@ ENTRY(entry_SYSENTER_compat)
pushq $0 /* pt_regs->r14 = 0 */
pushq $0 /* pt_regs->r15 = 0 */
cld
+ /* Can clear all because arguments are passed through the stack */
+ CLEAR_ALL_REGS
/*
* SYSENTER doesn't filter flags, so we need to clear NT and AC
@@ -223,6 +225,8 @@ GLOBAL(entry_SYSCALL_compat_after_hwframe)
pushq $0 /* pt_regs->r13 = 0 */
pushq $0 /* pt_regs->r14 = 0 */
pushq $0 /* pt_regs->r15 = 0 */
+ /* Can clear all because arguments are passed through the stack */
+ CLEAR_ALL_REGS
/*
* User mode is traced as though IRQs are on, and SYSENTER
@@ -348,6 +352,8 @@ ENTRY(entry_INT80_compat)
pushq %r14 /* pt_regs->r14 */
pushq %r15 /* pt_regs->r15 */
cld
+ /* Can clear all because arguments are passed through the stack */
+ CLEAR_ALL_REGS
/*
* User mode is traced as though IRQs are on, and the interrupt
--
2.14.3
next prev parent reply other threads:[~2018-01-10 1:04 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-10 1:03 x86/clearregs: Register sanitizing at kernel entry for speculation hygiene Andi Kleen
2018-01-10 1:03 ` [PATCH v1 1/8] x86/entry/clearregs: Remove partial stack frame in fast system call Andi Kleen
2018-01-10 2:46 ` Brian Gerst
2018-01-11 0:16 ` Andi Kleen
2018-01-11 0:54 ` Brian Gerst
2018-01-11 1:02 ` Andi Kleen
2018-01-11 0:55 ` Andy Lutomirski
2018-01-11 1:01 ` Andi Kleen
2018-01-11 1:01 ` Brian Gerst
2018-01-11 1:22 ` Andy Lutomirski
2018-01-11 1:47 ` Andi Kleen
2018-01-11 18:44 ` Andi Kleen
2018-01-11 2:09 ` Josh Poimboeuf
2018-01-12 3:22 ` Josh Poimboeuf
2018-01-10 1:03 ` [PATCH v1 2/8] x86/entry/clearregs: Add infrastructure to clear registers Andi Kleen
2018-01-11 19:58 ` Konrad Rzeszutek Wilk
2018-01-11 20:10 ` Andi Kleen
2018-01-10 1:03 ` [PATCH v1 3/8] x86/entry/clearregs: Clear registers for 64bit SYSCALL Andi Kleen
2018-01-11 3:35 ` Brian Gerst
2018-01-11 18:47 ` Andi Kleen
2018-01-12 3:45 ` Josh Poimboeuf
2018-01-10 1:03 ` Andi Kleen [this message]
2018-01-10 1:03 ` [PATCH v1 5/8] x86/entry/clearregs: Clear registers for 64bit exceptions/interrupts Andi Kleen
2018-01-10 1:23 ` Andy Lutomirski
2018-01-10 1:03 ` [PATCH v1 6/8] x86/entry/clearregs: Add number of arguments to syscall tables Andi Kleen
2018-01-10 1:26 ` Andy Lutomirski
2018-01-10 4:37 ` Andi Kleen
2018-01-10 20:05 ` Andy Lutomirski
2018-01-10 1:03 ` [PATCH v1 7/8] x86/entry/clearregs: Add 64bit stubs to clear unused arguments regs Andi Kleen
2018-01-10 1:03 ` [PATCH v1 8/8] x86/entry/clearregs: Clear registers for 32bit kernel Andi Kleen
2018-01-10 1:24 ` Andy Lutomirski
2018-01-10 1:16 ` x86/clearregs: Register sanitizing at kernel entry for speculation hygiene Andy Lutomirski
2018-01-10 1:34 ` Andi Kleen
2018-01-10 1:39 ` Andy Lutomirski
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