diff options
| author |   Andrey Ryabinin <aryabinin@virtuozzo.com> | 2018-06-25 13:24:27 +0300 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-06-26 09:21:48 +0200 |
| commit | 0e311d237d7f3022b7dafb639b42541bfb42fe94 (patch) | |
| tree | e85cd99eb616208781f58e1f9034f3d752f60639 /arch/x86/entry/entry_64_compat.S | |
| parent | x86/entry/32: Add explicit 'l' instruction suffix (diff) | |
| download | wireguard-linux-0e311d237d7f3022b7dafb639b42541bfb42fe94.tar.xz wireguard-linux-0e311d237d7f3022b7dafb639b42541bfb42fe94.zip | |
x86/mm: Don't free P4D table when it is folded at runtime
When the P4D page table layer is folded at runtime, the p4d_free()
should do nothing, the same as in <asm-generic/pgtable-nop4d.h>.
It seems this bug should cause double-free in efi_call_phys_epilog(),
but I don't know how to trigger that code path, so I can't confirm that
by testing.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org # 4.17
Fixes: 98219dda2ab5 ("x86/mm: Fold p4d page table layer at runtime")
Link: http://lkml.kernel.org/r/20180625102427.15015-1-aryabinin@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/entry/entry_64_compat.S')
0 files changed, 0 insertions, 0 deletions