linux-kernel - Re: [PATCH] crypto: testmgr: Use linear alias for test input

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Date:   Wed, 21 Dec 2016 16:55:56 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Laura Abbott <labbott@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Christopher Covington <cov@...eaurora.org>
Subject: Re: [PATCH] crypto: testmgr: Use linear alias for test input

On Mon, Dec 19, 2016 at 03:37:26PM -0800, Laura Abbott wrote:
> Christopher Covington reported a crash on aarch64 on recent Fedora
> kernels:
> 
> kernel BUG at ./include/linux/scatterlist.h:140!
> Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162
> Hardware name: linux,dummy-virt (DT)
> task: ffff80007c650080 task.stack: ffff800008910000
> PC is at sg_init_one+0xa0/0xb8
> LR is at sg_init_one+0x24/0xb8
> ...
> [<ffff000008398db8>] sg_init_one+0xa0/0xb8
> [<ffff000008350a44>] test_acomp+0x10c/0x438
> [<ffff000008350e20>] alg_test_comp+0xb0/0x118
> [<ffff00000834f28c>] alg_test+0x17c/0x2f0
> [<ffff00000834c6a4>] cryptomgr_test+0x44/0x50
> [<ffff0000080dac70>] kthread+0xf8/0x128
> [<ffff000008082ec0>] ret_from_fork+0x10/0x50
> 
> The test vectors used for input are part of the kernel image. These
> inputs are passed as a buffer to sg_init_one which eventually blows up
> with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns
> false for the kernel image since virt_to_page will not return the
> correct page. The kernel image is also aliased to the linear map so get
> the linear alias and pass that to the scatterlist instead.
> 
> Reported-by: Christopher Covington <cov@...eaurora.org>
> Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp")
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
> x86 supports virt_addr_valid working on kernel image addresses but arm64 is
> more strict. This is the direction things have been moving with my
> CONFIG_DEBUG_VIRTUAL series for arm64 which is tightening the definition of
> __pa/__pa_symbol.

Please fix this by copying the templates to kmalloced memory like
the other test_* functions.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt