From: Nathan Chancellor <natechancellor@gmail.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com,
Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH] s390/kaslr: Fix casts in get_random
Date: Sat, 8 Feb 2020 07:10:52 -0700 [thread overview]
Message-ID: <20200208141052.48476-1-natechancellor@gmail.com> (raw)
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>
---
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
next reply other threads:[~2020-02-08 14:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 14:10 Nathan Chancellor [this message]
2020-02-08 17:12 ` [PATCH] s390/kaslr: Fix casts in get_random Nick Desaulniers
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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