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Message-Id: <1505940337-79069-30-git-send-email-keescook@chromium.org>
Date: Wed, 20 Sep 2017 13:45:35 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
Russell King <linux@...linux.org.uk>,
Ingo Molnar <mingo@...nel.org>,
Christian Borntraeger <borntraeger@...ibm.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
linux-arm-kernel@...ts.infradead.org,
linux-fsdevel@...r.kernel.org,
netdev@...r.kernel.org,
linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com,
David Windsor <dave@...lcore.net>
Subject: [PATCH v3 29/31] arm: Implement thread_struct whitelist for hardened usercopy
ARM does not carry FPU state in the thread structure, so it can declare
no usercopy whitelist at all.
Cc: Russell King <linux@...linux.org.uk>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/processor.h | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7888c9803eb0..4f1ab6c6b8c0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -48,6 +48,7 @@ config ARM
select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
select HAVE_ARCH_MMAP_RND_BITS if MMU
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
+ select HAVE_ARCH_THREAD_STRUCT_WHITELIST
select HAVE_ARCH_TRACEHOOK
select HAVE_ARM_SMCCC if CPU_V7
select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32
diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h
index c3d5fc124a05..d6dc45c92ee5 100644
--- a/arch/arm/include/asm/processor.h
+++ b/arch/arm/include/asm/processor.h
@@ -45,6 +45,13 @@ struct thread_struct {
struct debug_info debug;
};
+/* Nothing needs to be usercopy-whitelisted from thread_struct. */
+static inline void arch_thread_struct_whitelist(unsigned long *offset,
+ unsigned long *size)
+{
+ *offset = *size = 0;
+}
+
#define INIT_THREAD { }
#ifdef CONFIG_MMU
--
2.7.4
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