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From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>
Subject: [PATCH v3 0/4] arm64: compat: Add kuser helpers config option
Date: Tue,  2 Apr 2019 17:27:53 +0100	[thread overview]
Message-ID: <20190402162757.13491-1-vincenzo.frascino@arm.com> (raw)

Currently on arm64 compat kuser helper are enabled by default.

To be on pair with arm32, this patchset makes it possible to disable
the kuser helpers by adding a CONFIG_KUSER_HELPERS option which is
enabled by default to avoid compatibility issues.

When the config option is disabled:
 - The kuser helpers-related code is not compiled with the kernel.
 - The kuser helpers mapping, for any compat process, at 0xffff0000
   is not done.
 - Any attempt to use a kuser helper from a compat process will result
   in a segfault.

Changes:
--------
v3:
  - Fix aarch32_alloc_vdso_pages()
v2:
  - Rebased on 5.1-rc3.
  - Addressed review comments.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>

Vincenzo Frascino (4):
  arm64: compat: Alloc separate pages for vectors and sigpage
  arm64: compat: Split kuser32
  arm64: compat: Refactor aarch32_alloc_vdso_pages()
  arm64: compat: Add KUSER_HELPERS config option

 arch/arm64/Kconfig                 |  28 +++++
 arch/arm64/include/asm/elf.h       |   6 +-
 arch/arm64/include/asm/processor.h |   4 +-
 arch/arm64/include/asm/signal32.h  |   2 -
 arch/arm64/kernel/Makefile         |   5 +-
 arch/arm64/kernel/kuser32.S        |  66 ++----------
 arch/arm64/kernel/signal32.c       |   5 +-
 arch/arm64/kernel/sigreturn32.S    |  46 ++++++++
 arch/arm64/kernel/vdso.c           | 165 +++++++++++++++++++++++------
 9 files changed, 225 insertions(+), 102 deletions(-)
 create mode 100644 arch/arm64/kernel/sigreturn32.S

-- 
2.21.0


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             reply	other threads:[~2019-04-02 16:28 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-02 16:27 Vincenzo Frascino [this message]
2019-04-02 16:27 ` [PATCH v3 1/4] arm64: compat: Alloc separate pages for vectors and sigpage Vincenzo Frascino
2019-04-10 18:10   ` Will Deacon
2019-04-12 11:08     ` Vincenzo Frascino
2019-04-12 11:55       ` Will Deacon
2019-04-12 13:28         ` Vincenzo Frascino
2019-04-12 13:30         ` Russell King - ARM Linux admin
2019-04-02 16:27 ` [PATCH v3 2/4] arm64: compat: Split kuser32 Vincenzo Frascino
2019-04-02 16:27 ` [PATCH v3 3/4] arm64: compat: Refactor aarch32_alloc_vdso_pages() Vincenzo Frascino
2019-04-02 16:36   ` Catalin Marinas
2019-04-02 16:27 ` [PATCH v3 4/4] arm64: compat: Add KUSER_HELPERS config option Vincenzo Frascino
2019-04-04 10:08   ` Catalin Marinas
2019-04-04 14:07     ` Vincenzo Frascino
2019-04-04 14:51       ` Catalin Marinas
2019-04-04 15:01         ` Will Deacon

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