path: root/arch/s390/Kconfig.debug
diff options
authorHeiko Carstens <heiko.carstens@de.ibm.com>2010-02-26 22:37:22 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-02-26 22:37:29 +0100
commit1dcec254afe5bc700a4cacf810b71a28bd994ea9 (patch)
treef96d7fbd9f1fba0701e3648d2b5d82f3938353f8 /arch/s390/Kconfig.debug
parent68c6b859846bd078b37c6ca5f3882032f129e72d (diff)
[S390] uaccess: implement strict user copy checks
Same as on x86 and sparc, besides the fact that enabling the option will just emit compile time warnings instead of errors. Keeps allyesconfig kernels compiling. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig.debug')
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/Kconfig.debug b/arch/s390/Kconfig.debug
index 2283933a9a9..45e0c6199f3 100644
--- a/arch/s390/Kconfig.debug
+++ b/arch/s390/Kconfig.debug
@@ -6,4 +6,17 @@ config TRACE_IRQFLAGS_SUPPORT
source "lib/Kconfig.debug"
+ bool "Strict user copy size checks"
+ ---help---
+ Enabling this option turns a certain set of sanity checks for user
+ copy operations into compile time warnings.
+ The copy_from_user() etc checks are there to help test if there
+ are sufficient security checks on the length argument of
+ the copy operation, by having gcc prove that the argument is
+ within bounds.
+ If unsure, or if you run an older (pre 4.4) gcc, say N.