From: Jason Cooper <jason@xxxxxxxxxxxxxx> Subject: arm64: 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/20160803233913.32511-5-jason@xxxxxxxxxxxxxx Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx> Acked-by: Will Deacon <will.deacon@xxxxxxx> Acked-by: Kees Cook <keescook@xxxxxxxxxxxx> Cc: "Russell King - ARM Linux" <linux@xxxxxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/arm64/kernel/process.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff -puN arch/arm64/kernel/process.c~arm64-use-simpler-api-for-random-address-requests arch/arm64/kernel/process.c --- a/arch/arm64/kernel/process.c~arm64-use-simpler-api-for-random-address-requests +++ a/arch/arm64/kernel/process.c @@ -372,12 +372,8 @@ unsigned long arch_align_stack(unsigned unsigned long arch_randomize_brk(struct mm_struct *mm) { - unsigned long range_end = mm->brk; - if (is_compat_task()) - range_end += 0x02000000; + return randomize_page(mm->brk, 0x02000000); else - range_end += 0x40000000; - - return randomize_range(mm->brk, range_end, 0) ? : mm->brk; + return randomize_page(mm->brk, 0x40000000); } _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
