Commit 9988f4d5 authored Dec 16, 2016 by Kees Cook

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@freemail.hu>

Reported-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Brad Spengler <spender@grsecurity.net>
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

parent 0c744ea4

scripts/gcc-plugins/latent_entropy_plugin.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}