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stackprotector: turn not having the right gcc into a #warning

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If the user selects the stack-protector config option, but does not have
a gcc that has the right bits enabled (for example because it isn't build
with a glibc that supports TLS, as is common for cross-compilers, but also
because it may be too old), then the runtime test fails right now.

This patch adds a warning message for this scenario. This warning accomplishes
two goals
1) the user is informed that the security option he selective isn't available
2) the user is suggested to turn of the CONFIG option that won't work for him,
   and would make the runtime test fail anyway.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Arjan van de Ven 2008-04-18 06:16:45 -07:00 committed by Thomas Gleixner
parent b719ac56c0
commit b40a4392a3
2 changed files with 4 additions and 1 deletions
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2
arch/x86/Makefile
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@ -73,7 +73,7 @@ else
stackp := $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh
stackp-$(CONFIG_CC_STACKPROTECTOR) := $(shell $(stackp) \
"$(CC)" -fstack-protector )
"$(CC)" "-fstack-protector -DGCC_HAS_SP" )
stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += $(shell $(stackp) \
"$(CC)" -fstack-protector-all )

3
kernel/panic.c
View file

@ -325,6 +325,9 @@ EXPORT_SYMBOL(warn_on_slowpath);
#ifdef CONFIG_CC_STACKPROTECTOR
#ifndef GCC_HAS_SP
#warning You have selected the CONFIG_CC_STACKPROTECTOR option, but the gcc used does not support this.
#endif
static unsigned long __stack_check_testing;
/*
* Self test function for the stack-protector feature.