linux

mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-13 07:31:07 +00:00

Kirill A. Shutemov be739f4b5d x86/mm: Fix ELF_ET_DYN_BASE for 5-level paging On machines with 5-level paging we don't want to allocate mapping above 47-bit unless user explicitly asked for it. See `b569bab78d` ("x86/mm: Prepare to expose larger address space to userspace") for details. `c715b72c1b` ("mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base changes") broke the behaviour. After the commit elf binary and heap got mapped above 47-bits. Use DEFAULT_MAP_WINDOW instead of TASK_SIZE to determine ELF_ET_DYN_BASE so it's forced to be below 47-bits unconditionally. Fixes: `c715b72c1b` ("mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base changes") Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Kees Cook <keescook@chromium.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: linux-mm@kvack.org Cc: Andrew Morton <akpm@linux-foundation.org> Link: https://lkml.kernel.org/r/20171107103804.47341-1-kirill.shutemov@linux.intel.com	History 2017-11-09 18:20:20 +01:00
..
asm	x86/mm: Fix ELF_ET_DYN_BASE for 5-level paging	2017-11-09 18:20:20 +01:00
uapi/asm	License cleanup: add SPDX license identifier to uapi header files with a license	2017-11-02 11:20:11 +01:00

Kirill A. Shutemov be739f4b5d x86/mm: Fix ELF_ET_DYN_BASE for 5-level paging

On machines with 5-level paging we don't want to allocate mapping above
47-bit unless user explicitly asked for it. See b569bab78d ("x86/mm:
Prepare to expose larger address space to userspace") for details.

c715b72c1b ("mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base
changes") broke the behaviour. After the commit elf binary and heap got
mapped above 47-bits.

Use DEFAULT_MAP_WINDOW instead of TASK_SIZE to determine ELF_ET_DYN_BASE so
it's forced to be below 47-bits unconditionally.

Fixes: c715b72c1b ("mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base changes")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/20171107103804.47341-1-kirill.shutemov@linux.intel.com

History

2017-11-09 18:20:20 +01:00

asm x86/mm: Fix ELF_ET_DYN_BASE for 5-level paging 2017-11-09 18:20:20 +01:00

uapi/asm License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00