diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-09-20 05:09:58 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-09-29 17:20:46 -0700 |
| commit | ce60f27bb62dfeb1bf827350520f34abc84e0933 (patch) | |
| tree | ba2bb32d49a6ed1df73a1f1e62392929b12c5e1f /lib/test_fortify/write_overflow-strlcpy.c | |
| parent | a501a0703044f00180d7697b32cacd7ff46d02d8 (diff) | |
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: bcc6cc832573 ("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>
Diffstat (limited to 'lib/test_fortify/write_overflow-strlcpy.c')
0 files changed, 0 insertions, 0 deletions