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Message-Id: <20170308213844.131877-4-thgarnie@google.com>
Date: Wed, 8 Mar 2017 13:38:44 -0800
From: Thomas Garnier <thgarnie@...gle.com>
To: Arnd Bergmann <arnd@...db.de>,
David Howells <dhowells@...hat.com>,
Al Viro <viro@...iv.linux.org.uk>,
Dave Hansen <dave.hansen@...el.com>,
Thomas Garnier <thgarnie@...gle.com>,
René Nyffenegger <mail@...enyffenegger.ch>,
Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
Petr Mladek <pmladek@...e.com>,
Andy Lutomirski <luto@...nel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Nicolas Pitre <nicolas.pitre@...aro.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Helge Deller <deller@....de>,
Rik van Riel <riel@...hat.com>,
Ingo Molnar <mingo@...nel.org>,
John Stultz <john.stultz@...aro.org>,
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Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
Stephen Smalley <sds@...ho.nsa.gov>,
Frederic Weisbecker <fweisbec@...il.com>,
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Cc: linux-api@...r.kernel.org,
linux-kernel@...r.kernel.org,
x86@...nel.org,
linux-arm-kernel@...ts.infradead.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v1 4/4] arm64/syscalls: Specific usage of verify_pre_usermode_state
Implement specific usage of verify_pre_usermode_state for user-mode
returns for arm64.
---
Based on next-20170308
---
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/entry.S | 2 ++
2 files changed, 3 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 896eba61e5ed..da54774838d8 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -24,6 +24,7 @@ config ARM64
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
select ARCH_WANT_FRAME_POINTERS
select ARCH_HAS_UBSAN_SANITIZE_ALL
+ select ARCH_NO_SYSCALL_VERIFY_PRE_USERMODE_STATE
select ARM_AMBA
select ARM_ARCH_TIMER
select ARM_GIC
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 43512d4d7df2..b3d1d9e5c7c1 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -744,6 +744,7 @@ ENDPROC(cpu_switch_to)
ret_fast_syscall:
disable_irq // disable interrupts
str x0, [sp, #S_X0] // returned x0
+ bl verify_pre_usermode_state
ldr x1, [tsk, #TSK_TI_FLAGS] // re-check for syscall tracing
and x2, x1, #_TIF_SYSCALL_WORK
cbnz x2, ret_fast_syscall_trace
@@ -771,6 +772,7 @@ work_pending:
*/
ret_to_user:
disable_irq // disable interrupts
+ bl verify_pre_usermode_state
ldr x1, [tsk, #TSK_TI_FLAGS]
and x2, x1, #_TIF_WORK_MASK
cbnz x2, work_pending
--
2.12.0.246.ga2ecc84866-goog
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