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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-11-07 13:38:04 +0300
committerThomas Gleixner <tglx@linutronix.de>2017-11-09 18:20:20 +0100
commitbe739f4b5ddece74ef25e2304b17a7fd24575e9b (patch)
tree2e0f2e78107f54781f4e278bdbbd5df0a14760bc
parentd0cd64b02aa854d68ce517cb7da1fe4e4fff2653 (diff)
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 b569bab78d8d ("x86/mm: Prepare to expose larger address space to userspace") for details. c715b72c1ba4 ("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: c715b72c1ba4 ("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
-rw-r--r--arch/x86/include/asm/elf.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index c1a125e47ff3..3a091cea36c5 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -253,7 +253,7 @@ extern int force_personality32;
* space open for things that want to use the area for 32-bit pointers.
*/
#define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \
- (TASK_SIZE / 3 * 2))
+ (DEFAULT_MAP_WINDOW / 3 * 2))
/* This yields a mask that user programs can use to figure out what
instruction set this CPU supports. This could be done in user space,

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