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Message-Id: <20170309012456.5631-4-thgarnie@google.com>
Date: Wed, 8 Mar 2017 17:24:56 -0800
From: Thomas Garnier <thgarnie@...gle.com>
To: David Howells <dhowells@...hat.com>,
Dave Hansen <dave.hansen@...el.com>,
Arnd Bergmann <arnd@...db.de>,
Al Viro <viro@...iv.linux.org.uk>,
René Nyffenegger <mail@...enyffenegger.ch>,
Thomas Garnier <thgarnie@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
"David S . Miller" <davem@...emloft.net>,
Andy Lutomirski <luto@...nel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Nicolas Pitre <nicolas.pitre@...aro.org>,
Petr Mladek <pmladek@...e.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
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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 v2 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 | 15 +++++++++++++++
2 files changed, 16 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..eca392ae63e9 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -737,6 +737,19 @@ ENTRY(cpu_switch_to)
ret
ENDPROC(cpu_switch_to)
+#ifdef CONFIG_BUG_ON_DATA_CORRUPTION
+.macro VERIFY_PRE_USERMODE_STATE
+ bl verify_pre_usermode_state
+.endm
+#else
+/* Similar to set_fs(USER_DS) in verify_pre_usermode_state without a warning. */
+.macro VERIFY_PRE_USERMODE_STATE
+ mov x1, #TASK_SIZE_64
+ str x1, [tsk, #TSK_TI_ADDR_LIMIT]
+.endm
+#endif
+
+
/*
* This is the fast syscall return path. We do as little as possible here,
* and this includes saving x0 back into the kernel stack.
@@ -744,6 +757,7 @@ ENDPROC(cpu_switch_to)
ret_fast_syscall:
disable_irq // disable interrupts
str x0, [sp, #S_X0] // returned x0
+ 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 +785,7 @@ work_pending:
*/
ret_to_user:
disable_irq // disable interrupts
+ 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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