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List:       user-mode-linux-devel
Subject:    [uml-devel] [PATCH 7/7] uml: export symbols added by GCC hardened
From:       "Paolo 'Blaisorblade' Giarrusso" <blaisorblade () yahoo ! it>
Date:       2006-04-30 14:16:24
Message-ID: 20060430141624.9060.12015.stgit () zion ! home ! lan
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From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>

GCC hardened introduces additional symbol refererences (for the canary and
friends), also in modules - add weak export_symbols for them. We already tested
that the weak declaration creates no problem on both GCC's providing the
function definition and on GCC's which don't provide it.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---

 arch/um/os-Linux/user_syms.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
index 2598158..3f33165 100644
--- a/arch/um/os-Linux/user_syms.c
+++ b/arch/um/os-Linux/user_syms.c
@@ -96,6 +96,13 @@ EXPORT_SYMBOL_PROTO(getuid);
 EXPORT_SYMBOL_PROTO(fsync);
 EXPORT_SYMBOL_PROTO(fdatasync);
 
+/* Export symbols used by GCC for the stack protector. */
+extern void __stack_smash_handler(void *) __attribute__((weak));
+EXPORT_SYMBOL(__stack_smash_handler);
+
+extern long __guard __attribute__((weak));
+EXPORT_SYMBOL(__guard);
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically


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