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

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commit df54d6fa54 upstream.

When the stack is set to unlimited, the bottomup direction is used for
mmap-ings but the mmap_base is not used and thus effectively renders
ASLR for mmapings along with PIE useless.

Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Sendroiu <molecula2788@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Radu Caragea
2013-08-13 16:00:59 -07:00
committed by Greg Kroah-Hartman
parent 4f01c72ef3
commit f6c19e2f7d
3 changed files with 3 additions and 2 deletions
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1
include/linux/sched.h
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@@ -314,6 +314,7 @@ 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,