Revert "x86 get_unmapped_area(): use proper mmap base for bottom-up direction"

commit 5ea80f76a56605a190a7ea16846c82aa63dbd0aa upstream.

This reverts commit df54d6fa54275ce59660453e29d1228c2b45a826.

The commit isn't necessarily wrong, but because it recalculates the
random mmap_base every time, it seems to confuse user memory allocators
that expect contiguous mmap allocations even when the mmap address isn't
specified.

In particular, the MATLAB Java runtime seems to be unhappy. See

  https://bugzilla.kernel.org/show_bug.cgi?id=60774

So we'll want to apply the random offset only once, and Radu has a patch
for that.  Revert this older commit in order to apply the other one.

Reported-by: Jeff Shorey <shoreyjeff@gmail.com>
Cc: Radu Caragea <sinaelgl@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
index 48f8375e4c6b07edfbcefd819a8210f6e0839dfe..dbded5aedb818d511a46967ccb1d26d77233110f 100644 (file)
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -101,7 +101,7 @@ static void find_start_end(unsigned long flags, unsigned long *begin,
                                *begin = new_begin;
                }
        } else {
-               *begin = mmap_legacy_base();
+               *begin = TASK_UNMAPPED_BASE;
                *end = TASK_SIZE;
        }
 }

diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index c1af32385ab100343d791060d02adaabcbd60328..845df6835f9ff5fc216ab01857100d41eba77fbf 100644 (file)
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -98,7 +98,7 @@ static unsigned long mmap_base(void)
  * Bottom-up (legacy) layout on X86_32 did not support randomization, X86_64
  * does, but not when emulating X86_32
  */
-unsigned long mmap_legacy_base(void)
+static unsigned long mmap_legacy_base(void)
 {
        if (mmap_is_ia32())
                return TASK_UNMAPPED_BASE;

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3aeb14b062428250dbcb495220df33822176eda0..178a8d909f14a3dcdcbc0ce255572975c8b3b221 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -314,7 +314,6 @@ struct nsproxy;
 struct user_namespace;
 
 #ifdef CONFIG_MMU
-extern unsigned long mmap_legacy_base(void);
 extern void arch_pick_mmap_layout(struct mm_struct *mm);
 extern unsigned long
 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,