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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
parent68c6b859846bd078b37c6ca5f3882032f129e72d (diff)
downloadlinux-2.6.34-ux500-1dcec254afe5bc700a4cacf810b71a28bd994ea9.tar.gz
[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')
-rw-r--r--arch/s390/Kconfig.debug13
-rw-r--r--arch/s390/include/asm/uaccess.h12
-rw-r--r--arch/s390/lib/Makefile2
-rw-r--r--arch/s390/lib/usercopy.c8
4 files changed, 34 insertions, 1 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"
+config DEBUG_STRICT_USER_COPY_CHECKS
+ 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.
+
endmenu
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index cbf0a8745bf..d6b1ed0ec52 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -265,6 +265,12 @@ __copy_from_user(void *to, const void __user *from, unsigned long n)
return uaccess.copy_from_user(n, from, to);
}
+extern void copy_from_user_overflow(void)
+#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
+__compiletime_warning("copy_from_user() buffer size is not provably correct")
+#endif
+;
+
/**
* copy_from_user: - Copy a block of data from user space.
* @to: Destination address, in kernel space.
@@ -284,7 +290,13 @@ __copy_from_user(void *to, const void __user *from, unsigned long n)
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
+ unsigned int sz = __compiletime_object_size(to);
+
might_fault();
+ if (unlikely(sz != -1 && sz < n)) {
+ copy_from_user_overflow();
+ return n;
+ }
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
else
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index 97975ec7a27..cd54a1c352a 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -2,7 +2,7 @@
# Makefile for s390-specific library files..
#
-lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
+lib-y += delay.o string.o uaccess_std.o uaccess_pt.o usercopy.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o
lib-$(CONFIG_64BIT) += uaccess_mvcos.o
lib-$(CONFIG_SMP) += spinlock.o
diff --git a/arch/s390/lib/usercopy.c b/arch/s390/lib/usercopy.c
new file mode 100644
index 00000000000..14b363fec8a
--- /dev/null
+++ b/arch/s390/lib/usercopy.c
@@ -0,0 +1,8 @@
+#include <linux/module.h>
+#include <linux/bug.h>
+
+void copy_from_user_overflow(void)
+{
+ WARN(1, "Buffer overflow detected!\n");
+}
+EXPORT_SYMBOL(copy_from_user_overflow);