From: Nick Desaulniers <ndesaulniers@google.com>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: [PATCH] s390/kaslr: Fix casts in get_random
Date: Sat, 8 Feb 2020 17:12:21 +0000 [thread overview]
Message-ID: <CAKwvOdm8-nL=BnTaCort+tAm27bkBzygmipZ7L3eBD4zvmyb8g@mail.gmail.com> (raw)
In-Reply-To: <20200208141052.48476-1-natechancellor@gmail.com>
On Sat, Feb 8, 2020 at 3:11 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> Clang warns:
>
> ../arch/s390/boot/kaslr.c:78:25: warning: passing 'char *' to parameter
> of type 'const u8 *' (aka 'const unsigned char *') converts between
> pointers to integer
> types with different sign [-Wpointer-sign]
> (char *) entropy, (char *) entropy,
> ^~~~~~~~~~~~~~~~
> ../arch/s390/include/asm/cpacf.h:280:28: note: passing argument to
> parameter 'src' here
> u8 *dest, const u8 *src, long src_len)
> ^
> 2 warnings generated.
>
> Fix the cast to match what else is done in this function.
>
> Fixes: b2d24b97b2a9 ("s390/kernel: add support for kernel address space layout randomization (KASLR)")
> Link: https://github.com/ClangBuiltLinux/linux/issues/862
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> arch/s390/boot/kaslr.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/s390/boot/kaslr.c b/arch/s390/boot/kaslr.c
> index 5d12352545c5..5591243d673e 100644
> --- a/arch/s390/boot/kaslr.c
> +++ b/arch/s390/boot/kaslr.c
> @@ -75,7 +75,7 @@ static unsigned long get_random(unsigned long limit)
> *(unsigned long *) prng.parm_block ^= seed;
> for (i = 0; i < 16; i++) {
> cpacf_kmc(CPACF_KMC_PRNG, prng.parm_block,
> - (char *) entropy, (char *) entropy,
> + (u8 *) entropy, (u8 *) entropy,
> sizeof(entropy));
> memcpy(prng.parm_block, entropy, sizeof(entropy));
> }
> --
> 2.25.0
>
> --
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> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200208141052.48476-1-natechancellor%40gmail.com.
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2020-02-08 17:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 14:10 [PATCH] s390/kaslr: Fix casts in get_random Nathan Chancellor
2020-02-08 17:12 ` Nick Desaulniers [this message]
2020-02-08 20:17 ` Joe Perches
2020-02-14 6:46 ` Nathan Chancellor
2020-02-17 17:13 ` Vasily Gorbik
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