Commit c984cbf2 authored Oct 11, 2016 by Jason Cooper Committed by Linus Torvalds Oct 11, 2016

ARM: use simpler API for random address requests

Currently, all callers to randomize_range() set the length to 0 and
calculate end by adding a constant to the start address.  We can simplify
the API to remove a bunch of needless checks and variables.

Use the new randomize_addr(start, range) call to set the requested
address.

Link: http://lkml.kernel.org/r/20160803233913.32511-4-jason@lakedaemon.net


Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: "Russell King - ARM Linux" <linux@arm.linux.org.uk>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 9c6f0902

arch/arm/kernel/process.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -318,8 +318,7 @@ unsigned long get_wchan(struct task_struct *p)

		unsigned long arch_randomize_brk(struct mm_struct *mm)
		{
		unsigned long range_end = mm->brk + 0x02000000;
		return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
		return randomize_page(mm->brk, 0x02000000);
		}

		#ifdef CONFIG_MMU

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