[PATCH 1/4] um: Fix _FORTIFY_SOURCE=2 support for kernel modules

[Richard Weinberger]

When UML is compiled with _FORTIFY_SOURCE we have to
export all _chk() functions which are used in modules.
For now it's only the case for __sprintf_chk().

Tested-by: Florian Fainelli <florian@xxxxxxxxxxx>
Reported-by: Florian Fainelli <florian@xxxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
---
 arch/um/os-Linux/user_syms.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
index 05f5ea8..45ffe46 100644
--- a/arch/um/os-Linux/user_syms.c
+++ b/arch/um/os-Linux/user_syms.c
@@ -113,3 +113,8 @@ EXPORT_SYMBOL(__stack_smash_handler);
 
 extern long __guard __attribute__((weak));
 EXPORT_SYMBOL(__guard);
+
+#ifdef _FORTIFY_SOURCE
+extern int __sprintf_chk(char *str, int flag, size_t strlen, const char *format);
+EXPORT_SYMBOL(__sprintf_chk);
+#endif
-- 
1.7.5.4

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