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Matthew Wilcox (Oracle) ce60f27bb6 mm: abstract moving to the next PFN
In order to fix the L1TF vulnerability, x86 can invert the PTE bits for
PROT_NONE VMAs, which means we cannot move from one PTE to the next by
adding 1 to the PFN field of the PTE.  This results in the BUG reported at
[1].

Abstract advancing the PTE to the next PFN through a pte_next_pfn()
function/macro.

Link: https://lkml.kernel.org/r/20230920040958.866520-1-willy@infradead.org
Fixes: bcc6cc8325 ("mm: add default definition of set_ptes()")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reported-by: syzbot+55cc72f8cc3a549119df@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/000000000000d099fa0604f03351@google.com [1]
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-09-29 17:20:46 -07:00
arch mm: abstract moving to the next PFN 2023-09-29 17:20:46 -07:00
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Documentation Driver core fix for 6.6-rc2 2023-09-16 11:26:52 -07:00
drivers SCSI fixes on 20230916 2023-09-16 11:54:48 -07:00
fs fs: binfmt_elf_efpic: fix personality for ELF-FDPIC 2023-09-29 17:20:45 -07:00
include mm: abstract moving to the next PFN 2023-09-29 17:20:46 -07:00
init
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kernel pidfd: prevent a kernel-doc warning 2023-09-19 13:21:33 -07:00
lib argv_split: fix kernel-doc warnings 2023-09-19 13:21:33 -07:00
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mm mm: report success more often from filemap_map_folio_range() 2023-09-29 17:20:45 -07:00
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scripts revert "scripts/gdb/symbols: add specific ko module load command" 2023-09-19 13:21:33 -07:00
security
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tools selftests/proc: fixup proc-empty-vm test after KSM changes 2023-09-19 13:21:33 -07:00
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Makefile Linux 6.6-rc2 2023-09-17 14:40:24 -07:00
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.