linux-kernel - [PATCH 0/2] mm: make copy_to_kernel_nofault() not fault on user addresses

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Message-ID: <cover.1725223574.git.osandov@fb.com>
Date: Sun,  1 Sep 2024 22:31:27 -0700
From: Omar Sandoval <osandov@...ndov.com>
To: linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Hellwig <hch@....de>,
	x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org,
	linux-parisc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-um@...ts.infradead.org,
	kernel-team@...com
Subject: [PATCH 0/2] mm: make copy_to_kernel_nofault() not fault on user addresses

From: Omar Sandoval <osandov@...com>

Hi,

I hit a case where copy_to_kernel_nofault() will fault (lol): if the
destination address is in userspace and x86 Supervisor Mode Access
Prevention is enabled. Patch 2 has the details and the fix. Patch 1
renames a helper function so that its use in patch 2 makes more sense.
If the rename is too intrusive, I can drop it.

Thanks,
Omar

Omar Sandoval (2):
  mm: rename copy_from_kernel_nofault_allowed() to
    copy_kernel_nofault_allowed()
  mm: make copy_to_kernel_nofault() not fault on user addresses

 arch/arm/mm/fault.c         |  2 +-
 arch/loongarch/mm/maccess.c |  2 +-
 arch/mips/mm/maccess.c      |  2 +-
 arch/parisc/lib/memcpy.c    |  2 +-
 arch/powerpc/mm/maccess.c   |  2 +-
 arch/um/kernel/maccess.c    |  2 +-
 arch/x86/mm/maccess.c       |  4 ++--
 include/linux/uaccess.h     |  2 +-
 mm/maccess.c                | 10 ++++++----
 9 files changed, 15 insertions(+), 13 deletions(-)

-- 
2.46.0