From: daniel@iogearbox•net (Daniel Borkmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] arm64: Allow vmalloc regions to be set with set_memory_*
Date: Wed, 13 Jan 2016 01:31:20 +0100 [thread overview]
Message-ID: <56959AD8.90206@iogearbox.net> (raw)
In-Reply-To: <20160113000112.GA36310@ast-mbp.thefacebook.com>
On 01/13/2016 01:01 AM, Alexei Starovoitov wrote:
> On Tue, Jan 12, 2016 at 01:46:27PM -0800, Laura Abbott wrote:
>>
>> The range of set_memory_* is currently restricted to the module address
>> range because of difficulties in breaking down larger block sizes.
>> vmalloc maps PAGE_SIZE pages so it is safe to use as well. Update the
>> function ranges and add a comment explaining why the range is restricted
>> the way it is.
>>
>> Signed-off-by: Laura Abbott <labbott@fedoraproject•org>
>> ---
>> This should let the protections for the eBPF work as expected, I don't
>> know if there is some sort of self test for thatL.
>
> you can test it with:
> # sysctl net.core.bpf_jit_enable=1
> # insmod test_bpf.ko
>
> On x64 it shows:
> test_bpf: Summary: 291 PASSED, 0 FAILED, [282/283 JIT'ed]
>
> arm64 may have less JIT'ed tests.
Also, in that lib/test_bpf.c file, you can do a test by overwriting/'corrupting'
part of the fp->insnsi instructions right after bpf_prog_select_runtime(fp) to
see if setting the bpf_prog as RO works.
Thanks,
Daniel
next prev parent reply other threads:[~2016-01-13 0:31 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-12 21:46 [PATCH] arm64: Allow vmalloc regions to be set with set_memory_* Laura Abbott
2016-01-13 0:01 ` Alexei Starovoitov
2016-01-13 0:31 ` Daniel Borkmann [this message]
2016-01-13 14:03 ` Ard Biesheuvel
2016-01-13 16:10 ` Ard Biesheuvel
2016-01-14 23:01 ` Laura Abbott
2016-01-18 11:56 ` Mark Rutland
2016-01-28 1:47 ` Xishi Qiu
2016-01-28 10:51 ` Mark Rutland
2016-01-28 11:47 ` Xishi Qiu
2016-01-28 14:27 ` Mark Rutland
2016-01-29 1:21 ` Xishi Qiu
2016-01-29 11:02 ` Mark Rutland
2016-01-30 2:48 ` Xishi Qiu
2016-02-03 13:43 ` Mark Rutland
-- strict thread matches above, loose matches on Subject: below --
2016-01-18 14:01 [PATCH] arm64: allow " Ard Biesheuvel
2016-01-18 15:05 ` Mark Rutland
2016-01-28 15:08 ` Will Deacon
2016-01-28 16:40 ` Ard Biesheuvel
2016-01-28 16:43 ` Ard Biesheuvel
2016-01-28 18:10 ` Will Deacon
2016-01-28 19:07 ` Ard Biesheuvel
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