From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: arnd@arndb.de, catalin.marinas@arm.com, cdall@linaro.org,
kvmarm@lists.cs.columbia.edu, linux-arch@vger.kernel.org,
marc.zyngier@arm.com, mark.rutland@arm.com,
suzuki.poulose@arm.com, will.deacon@arm.com, yao.qi@arm.com,
kernel-hardening@lists.openwall.com,
linux-kernel@vger.kernel.org, awallis@codeaurora.org
Subject: [PATCHv2 01/12] asm-generic: mm_hooks: allow hooks to be overridden individually
Date: Mon, 27 Nov 2017 16:37:55 +0000 [thread overview]
Message-ID: <20171127163806.31435-2-mark.rutland@arm.com> (raw)
In-Reply-To: <20171127163806.31435-1-mark.rutland@arm.com>
Currently, an architecture must either implement all of the mm hooks
itself, or use all of those provided by the asm-generic implementation.
When an architecture only needs to override a single hook, it must copy
the stub implementations from the asm-generic version.
To avoid this repetition, allow each hook to be overridden indiviually,
by placing each under an #ifndef block. As architectures providing their
own hooks can't include this file today, this shouldn't adversely affect
any existing hooks.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
---
include/asm-generic/mm_hooks.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h
index ea189d88a3cc..34edf0850d49 100644
--- a/include/asm-generic/mm_hooks.h
+++ b/include/asm-generic/mm_hooks.h
@@ -7,30 +7,41 @@
#ifndef _ASM_GENERIC_MM_HOOKS_H
#define _ASM_GENERIC_MM_HOOKS_H
+#ifndef arch_dup_mmap
static inline void arch_dup_mmap(struct mm_struct *oldmm,
struct mm_struct *mm)
{
}
+#endif
+#ifndef arch_exit_mmap
static inline void arch_exit_mmap(struct mm_struct *mm)
{
}
+#endif
+#ifndef arch_unmap
static inline void arch_unmap(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
}
+#endif
+#ifndef arch_bprm_mm_init
static inline void arch_bprm_mm_init(struct mm_struct *mm,
struct vm_area_struct *vma)
{
}
+#endif
+#ifndef arch_vma_access_permitted
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
bool write, bool execute, bool foreign)
{
/* by default, allow everything */
return true;
}
+#endif
+
#endif /* _ASM_GENERIC_MM_HOOKS_H */
--
2.11.0
next prev parent reply other threads:[~2017-11-27 16:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 16:37 [PATCHv2 00/12] ARMv8.3 pointer authentication userspace support Mark Rutland
2017-11-27 16:37 ` Mark Rutland [this message]
2017-11-27 16:37 ` [PATCHv2 02/12] arm64: add pointer authentication register bits Mark Rutland
2017-11-27 16:37 ` [PATCHv2 03/12] arm64/cpufeature: add ARMv8.3 id_aa64isar1 bits Mark Rutland
2017-11-27 16:37 ` [PATCHv2 04/12] arm64/cpufeature: detect pointer authentication Mark Rutland
2017-11-27 16:37 ` [PATCHv2 05/12] arm64: Don't trap host pointer auth use to EL2 Mark Rutland
2018-02-06 12:39 ` Christoffer Dall
2018-02-12 16:00 ` Mark Rutland
2017-11-27 16:38 ` [PATCHv2 06/12] arm64: add basic pointer authentication support Mark Rutland
2018-05-22 19:06 ` Adam Wallis
2017-11-27 16:38 ` [PATCHv2 07/12] arm64: expose user PAC bit positions via ptrace Mark Rutland
2017-11-27 16:38 ` [PATCHv2 08/12] arm64: perf: strip PAC when unwinding userspace Mark Rutland
2017-11-27 16:38 ` [PATCHv2 09/12] arm64/kvm: preserve host HCR_EL2 value Mark Rutland
2018-02-06 12:39 ` Christoffer Dall
2018-04-09 14:57 ` Mark Rutland
2018-04-09 19:03 ` Christoffer Dall
2017-11-27 16:38 ` [PATCHv2 10/12] arm64/kvm: context-switch ptrauth registers Mark Rutland
2018-02-06 12:38 ` Christoffer Dall
2018-03-09 14:28 ` Mark Rutland
2018-04-09 12:58 ` Christoffer Dall
2018-04-09 14:37 ` Mark Rutland
2017-11-27 16:38 ` [PATCHv2 11/12] arm64: enable pointer authentication Mark Rutland
2017-11-27 16:38 ` [PATCHv2 12/12] arm64: docs: document " Mark Rutland
2017-11-28 15:07 ` Andrew Jones
2017-12-04 12:39 ` Mark Rutland
2017-12-04 12:49 ` Andrew Jones
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