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Groups > linux.kernel > #1711097

[PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE)

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In v4.12, during rework of infrastructure around mmap_base, disable-ASLR
personality flag got accidentally broken.

Let's make it work again.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Fixes: 1b028f784e8c ("x86/mm: Introduce mmap_compat_base() for 32-bit mmap()")
Cc: stable <stable@vger.kernel.org> [4.12+]
---
 arch/x86/mm/mmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index 229d04a83f85..779bdbe5e424 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -127,6 +127,8 @@ static unsigned long mmap_legacy_base(unsigned long rnd,
 static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
 		unsigned long random_factor, unsigned long task_size)
 {
+	if (!(current->flags & PF_RANDOMIZE))
+		random_factor = 0;
 	*legacy_base = mmap_legacy_base(random_factor, task_size);
 	if (mmap_is_legacy())
 		*base = *legacy_base;
-- 
2.14.1

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[PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE) "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-08-14 18:00 +0200
  Re: [PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE) Cyrill Gorcunov <gorcunov@gmail.com> - 2017-08-14 18:20 +0200
    Re: [PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE) "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-08-14 18:30 +0200
    Re: [PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE) "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-08-14 18:30 +0200
    Re: [PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE) Oleg Nesterov <oleg@redhat.com> - 2017-08-14 18:30 +0200
      Re: [PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE) Cyrill Gorcunov <gorcunov@gmail.com> - 2017-08-14 18:40 +0200

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