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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: Kees Cook <keescook@chromium.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	linux-mm@kvack.org, linux-hardening@vger.kernel.org
Subject: [PATCH 0/4] Assorted improvements to usercopy
Date: Mon, 10 Jan 2022 23:15:26 +0000	[thread overview]
Message-ID: <20220110231530.665970-1-willy@infradead.org> (raw)

The HARDENED_USERCOPY_PAGESPAN config option is hard to turn on because
much of the kernel uses non-compound high-order page allocations.
This patchset extracts the valuable parts of HARDENED_USERCOPY_PAGESPAN
and then removes the remainder.

v5:
 - Use get_vm_area_size() instead of ->size directly (Mark Hemment)
 - Rebase to current Linus (the slab merge changed a lot of code)
v4:
 - Add the fourth patch to remove HARDENED_USERCOPY_PAGESPAN
v3:
 - Remove a now-unused variable
v2:
 - Prevent a NULL pointer dereference when a vmalloc-range pointer
   doesn't have an associated allocation (me)
 - Report better offsets than "0" (Kees)

Matthew Wilcox (Oracle) (4):
  mm/usercopy: Check kmap addresses properly
  mm/usercopy: Detect vmalloc overruns
  mm/usercopy: Detect large folio overruns
  usercopy: Remove HARDENED_USERCOPY_PAGESPAN

 arch/x86/include/asm/highmem.h   |  1 +
 include/linux/highmem-internal.h | 10 ++++
 mm/usercopy.c                    | 97 +++++++++-----------------------
 security/Kconfig                 | 13 +----
 4 files changed, 39 insertions(+), 82 deletions(-)

-- 
2.33.0


             reply	other threads:[~2022-01-10 23:15 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-10 23:15 Matthew Wilcox (Oracle) [this message]
2022-01-10 23:15 ` [PATCH 1/4] mm/usercopy: Check kmap addresses properly Matthew Wilcox (Oracle)
2022-05-10  3:37   ` Andrew Morton
2022-05-10 22:01     ` Kees Cook
2022-01-10 23:15 ` [PATCH 2/4] mm/usercopy: Detect vmalloc overruns Matthew Wilcox (Oracle)
2022-01-10 23:15 ` [PATCH 3/4] mm/usercopy: Detect large folio overruns Matthew Wilcox (Oracle)
2022-01-31 14:28   ` David Hildenbrand
2022-01-10 23:15 ` [PATCH 4/4] usercopy: Remove HARDENED_USERCOPY_PAGESPAN Matthew Wilcox (Oracle)
2022-01-12 23:08   ` Kees Cook
2022-01-31 14:27   ` David Hildenbrand
2022-01-31 19:27     ` Matthew Wilcox

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