linux-kernel - [PATCH v3 0/6] x86/uaccess: avoid barrier

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Message-ID: <cover.1730166635.git.jpoimboe@kernel.org>
Date: Mon, 28 Oct 2024 18:56:13 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Waiman Long <longman@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Mark Rutland <mark.rutland@....com>,
	"Kirill A . Shutemov" <kirill@...temov.name>
Subject: [PATCH v3 0/6] x86/uaccess: avoid barrier_nospec()

v3:

- rebase on Linus' patch (v6.12-rc5)

- remove putuser(), copy_to_user(), clear_user() changes: as Linus
  points out, they don't produce a value that could be used in a
  dependent load to leak anything.

- convert 32-bit versions of copy_from_user(), get_user() and
  __get_user() and converge code.


Josh Poimboeuf (6):
  x86/uaccess: Avoid barrier_nospec() in 64-bit copy_from_user()
  x86/uaccess: Avoid barrier_nospec() in 64-bit __get_user()
  x86/uaccess: Avoid barrier_nospec() in 32-bit copy_from_user()
  x86/uaccess: Convert 32-bit get_user() to unconditional pointer
    masking
  x86/uaccess: Avoid barrier_nospec() in 32-bit __get_user()
  x86/uaccess: Converge [__]get_user() implementations

 arch/powerpc/include/asm/uaccess.h |  2 +
 arch/x86/include/asm/uaccess.h     | 34 ++++++++++++
 arch/x86/include/asm/uaccess_32.h  |  1 +
 arch/x86/include/asm/uaccess_64.h  | 30 +----------
 arch/x86/lib/getuser.S             | 85 ++++++++----------------------
 include/linux/uaccess.h            |  6 ---
 6 files changed, 61 insertions(+), 97 deletions(-)

-- 
2.47.0