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Florent Revest 0da668333f mm: make PR_MDWE_REFUSE_EXEC_GAIN an unsigned long 
Defining a prctl flag as an int is a footgun because on a 64 bit machine
and with a variadic implementation of prctl (like in musl and glibc), when
used directly as a prctl argument, it can get casted to long with garbage
upper bits which would result in unexpected behaviors.

This patch changes the constant to an unsigned long to eliminate that
possibilities.  This does not break UAPI.

I think that a stable backport would be "nice to have": to reduce the
chances that users build binaries that could end up with garbage bits in
their MDWE prctl arguments.  We are not aware of anyone having yet
encountered this corner case with MDWE prctls but a backport would reduce
the likelihood it happens, since this sort of issues has happened with
other prctls.  But If this is perceived as a backporting burden, I suppose
we could also live without a stable backport.

Link: https://lkml.kernel.org/r/20230828150858.393570-5-revest@chromium.org
Fixes: b507808ebc ("mm: implement memory-deny-write-execute as a prctl")
Signed-off-by: Florent Revest <revest@chromium.org>
Suggested-by: Alexey Izbyshev <izbyshev@ispras.ru>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ayush Jain <ayush.jain3@amd.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Cc: Topi Miettinen <toiwoton@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-10-06 14:44:11 -07:00
arch mm: add statistics for PUD level pagetable 2023-10-06 14:44:10 -07:00
block
certs
crypto
Documentation memcg: expose swapcache stat for memcg v1 2023-10-06 14:44:10 -07:00
drivers acpi,mm: fix typo sibiling -> sibling 2023-10-06 14:44:10 -07:00
fs fs: use nth_page() in place of direct struct page manipulation 2023-10-04 10:32:29 -07:00
include mm: make PR_MDWE_REFUSE_EXEC_GAIN an unsigned long 2023-10-06 14:44:11 -07:00
init
io_uring
ipc
kernel rcu: dynamically allocate the rcu-kfree shrinker 2023-10-04 10:32:24 -07:00
lib
LICENSES
mm delayacct: add memory reclaim delay in get_page_from_freelist 2023-10-06 14:44:10 -07:00
net sunrpc: dynamically allocate the sunrpc_cred shrinker 2023-10-04 10:32:24 -07:00
rust
samples
scripts
security
sound
tools mm: make PR_MDWE_REFUSE_EXEC_GAIN an unsigned long 2023-10-06 14:44:11 -07:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.