linux-kernel - [PATCH] ld.so on FC7 is mmap'ing shared libraries right in over guest memory.

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Message-Id: <1186657645.17752.60.camel@localhost.localdomain>
Date:	Thu, 09 Aug 2007 21:07:24 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	ron minnich <rminnich@...il.com>, lguest <lguest@...abs.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] ld.so on FC7 is mmap'ing shared libraries right in over
	guest memory.

From: Ronald G. Minnich <rminnich@...il.com>

[ FC7 maps shared libraries very low, where the launcher maps guest's
physical memory.  Quick fix is to link Launcher static, real fix is for
2.6.24. ]

-static is a simple fix. I expect this problem will be more common than we
like, as different distro's make different "improvements" to ld.so

Signed-off-by: Ronald G. Minnich <rminnich@...il.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff --git a/Documentation/lguest/Makefile b/Documentation/lguest/Makefile
index 31e794e..60136d8 100644
--- a/Documentation/lguest/Makefile
+++ b/Documentation/lguest/Makefile
@@ -13,7 +13,9 @@ LGUEST_GUEST_TOP := ($(CONFIG_PAGE_OFFSET) - 0x08000000)
 
 CFLAGS:=-Wall -Wmissing-declarations -Wmissing-prototypes -O3 -Wl,-T,lguest.lds
 LDLIBS:=-lz
-
+# Removing this works for some versions of ld.so (eg. Ubuntu Feisty) and
+# not others (eg. FC7).
+LDFLAGS+=-static
 all: lguest.lds lguest
 
 # The linker script on x86 is so complex the only way of creating one


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