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authorJan Beulich <JBeulich@suse.com>2013-10-21 09:44:37 +0100
committerIngo Molnar <mingo@kernel.org>2013-10-26 12:27:37 +0200
commit7a3d9b0f3abbea957b829cdfff8169872c575642 (patch)
tree905bb8d2f62b5bee5b1523ed6dff08dc81551763 /arch/x86/lib
parent3df7b41aa5e7797f391d0a41f8b0dce1fe366a09 (diff)
downloadlinux-7a3d9b0f3abbea957b829cdfff8169872c575642.tar.bz2
x86: Unify copy_to_user() and add size checking to it
Similarly to copy_from_user(), where the range check is to protect against kernel memory corruption, copy_to_user() can benefit from such checking too: Here it protects against kernel information leaks. Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: <arjan@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/5265059502000078000FC4F6@nat28.tlf.novell.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/usercopy_32.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
index c408d0222917..e2f5e21c03b3 100644
--- a/arch/x86/lib/usercopy_32.c
+++ b/arch/x86/lib/usercopy_32.c
@@ -654,14 +654,13 @@ EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
-unsigned long
-copy_to_user(void __user *to, const void *from, unsigned long n)
+unsigned long _copy_to_user(void __user *to, const void *from, unsigned n)
{
if (access_ok(VERIFY_WRITE, to, n))
n = __copy_to_user(to, from, n);
return n;
}
-EXPORT_SYMBOL(copy_to_user);
+EXPORT_SYMBOL(_copy_to_user);
/**
* copy_from_user: - Copy a block of data from user space.