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Date: Fri, 16 Dec 2016 13:06:59 -0800
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Emese Revfy <re.emese@...il.com>, kernel-hardening@...ts.openwall.com,
Arnd Bergmann <arnd@...db.de>, PaX Team <pageexec@...email.hu>,
Brad Spengler <spender@...ecurity.net>
Subject: [PATCH] latent_entropy: fix ARM build error on earlier gcc
This fixes build errors seen on gcc-4.9.3 or gcc-5.3.1 for an ARM:
arm-soc/init/initramfs.c: In function 'error':
arm-soc/init/initramfs.c:50:1: error: unrecognizable insn:
}
^
(insn 26 25 27 5 (set (reg:SI 111 [ local_entropy.243 ])
(rotatert:SI (reg:SI 116 [ local_entropy.243 ])
(const_int -30 [0xffffffffffffffe2]))) -1
(nil))
Patch from PaX Team <pageexec@...email.hu>
Reported-by: Arnd Bergmann <arnd@...db.de>
Reported-by: Brad Spengler <spender@...ecurity.net>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
scripts/gcc-plugins/latent_entropy_plugin.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/scripts/gcc-plugins/latent_entropy_plugin.c b/scripts/gcc-plugins/latent_entropy_plugin.c
index ff1939b804ae..eb1964084ccd 100644
--- a/scripts/gcc-plugins/latent_entropy_plugin.c
+++ b/scripts/gcc-plugins/latent_entropy_plugin.c
@@ -328,9 +328,9 @@ static enum tree_code get_op(tree *rhs)
op = LROTATE_EXPR;
/*
* This code limits the value of random_const to
- * the size of a wide int for the rotation
+ * the size of a long for the rotation
*/
- random_const &= HOST_BITS_PER_WIDE_INT - 1;
+ random_const %= TYPE_PRECISION(long_unsigned_type_node);
break;
}
--
2.7.4
--
Kees Cook
Nexus Security
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