linux-kernel - [PATCH v5 0/2] arm64: Implement getrandom() in vDSO

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Message-ID: <20240903120948.13743-1-adhemerval.zanella@linaro.org>
Date: Tue,  3 Sep 2024 12:09:15 +0000
From: Adhemerval Zanella <adhemerval.zanella@...aro.org>
To: "Jason A . Donenfeld" <Jason@...c4.com>,
	Theodore Ts'o <tytso@....edu>,
	linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arch@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Biggers <ebiggers@...nel.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>
Subject: [PATCH v5 0/2] arm64: Implement getrandom() in vDSO

Implement stack-less ChaCha20 and wire it with the generic vDSO
getrandom code.  The first patch is Mark's fix to the alternatives
system in the vDSO, while the the second is the actual vDSO work.

Changes from v4:
- Improve BE handling.

Changes from v3:
- Use alternative_has_cap_likely instead of ALTERNATIVE.
- Header/include and comment fixups.

Changes from v2:
- Refactor Makefile to use same flags for vgettimeofday and
  vgetrandom.
- Removed rodata usage and fixed BE on vgetrandom-chacha.S.

Changes from v1:
- Fixed style issues and typos.
- Added fallback for systems without NEON support.
- Avoid use of non-volatile vector registers in neon chacha20.
- Use c-getrandom-y for vgetrandom.c.
- Fixed TIMENS vdso_rnd_data access.

Adhemerval Zanella (1):
  arm64: vdso: wire up getrandom() vDSO implementation

Mark Rutland (1):
  arm64: alternative: make alternative_has_cap_likely() VDSO compatible

 arch/arm64/Kconfig                          |   1 +
 arch/arm64/include/asm/alternative-macros.h |   4 +
 arch/arm64/include/asm/mman.h               |   6 +-
 arch/arm64/include/asm/vdso.h               |   6 +
 arch/arm64/include/asm/vdso/getrandom.h     |  50 ++++++
 arch/arm64/include/asm/vdso/vsyscall.h      |  10 ++
 arch/arm64/kernel/vdso.c                    |   6 -
 arch/arm64/kernel/vdso/Makefile             |  25 ++-
 arch/arm64/kernel/vdso/vdso                 |   1 +
 arch/arm64/kernel/vdso/vdso.lds.S           |   4 +
 arch/arm64/kernel/vdso/vgetrandom-chacha.S  | 172 ++++++++++++++++++++
 arch/arm64/kernel/vdso/vgetrandom.c         |  15 ++
 tools/arch/arm64/vdso                       |   1 +
 tools/include/linux/compiler.h              |   4 +
 tools/testing/selftests/vDSO/Makefile       |   3 +-
 15 files changed, 292 insertions(+), 16 deletions(-)
 create mode 100644 arch/arm64/include/asm/vdso/getrandom.h
 create mode 120000 arch/arm64/kernel/vdso/vdso
 create mode 100644 arch/arm64/kernel/vdso/vgetrandom-chacha.S
 create mode 100644 arch/arm64/kernel/vdso/vgetrandom.c
 create mode 120000 tools/arch/arm64/vdso

-- 
2.43.0