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 v4 0/4] arm64: compat: Add kuser helpers config option
Date: Mon, 15 Apr 2019 10:49:33 +0100 [thread overview]
Message-ID: <20190415094937.13518-1-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:
--------
v4:
- Rebased on 5.1-rc5.
- Addressed review comments.
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/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 | 173 ++++++++++++++++++++++++------
8 files changed, 231 insertions(+), 100 deletions(-)
create mode 100644 arch/arm64/kernel/sigreturn32.S
--
2.21.0
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next reply other threads:[~2019-04-15 9:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 9:49 Vincenzo Frascino [this message]
2019-04-15 9:49 ` [PATCH v4 1/4] arm64: compat: Alloc separate pages for vectors and sigpage Vincenzo Frascino
2019-04-15 9:49 ` [PATCH v4 2/4] arm64: compat: Split kuser32 Vincenzo Frascino
2019-04-15 9:49 ` [PATCH v4 3/4] arm64: compat: Refactor aarch32_alloc_vdso_pages() Vincenzo Frascino
2019-04-15 9:49 ` [PATCH v4 4/4] arm64: compat: Add KUSER_HELPERS config option Vincenzo Frascino
2019-04-16 21:35 ` [PATCH v4 0/4] arm64: compat: Add kuser helpers " Will Deacon
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