Commits 4a3127693001c61a21d1ce680db6340623f52e93 ("x86: Turn the
copy_from_user check into an (optional) compile time warning") and
63312b6a6faae3f2e5577f2b001e3b504f10a2aa ("x86: Add a Kconfig option to
turn the copy_from_user warnings into errors") touched only the 32-bit
variant of copy_from_user(), whereas the original commit
9f0cf4adb6aa0bfccf675c938124e68f7f06349d ("x86: Use
__builtin_object_size() to validate the buffer size for
copy_from_user()") also added the same code to the 64-bit one.
Further the earlier conversion from an inline WARN() to the call to
copy_from_user_overflow() went a little too far: When the number of
bytes to be copied is not a constant (e.g. [looking at 3.11] in
drivers/net/tun.c:__tun_chr_ioctl() or
drivers/pci/pcie/aer/aer_inject.c:aer_inject_write()), the compiler
will always have to keep the funtion call, and hence there will always
be a warning. By using __builtin_constant_p() we can avoid this.
And then this slightly extends the effect of
CONFIG_DEBUG_STRICT_USER_COPY_CHECKS in that apart from converting
warnings to errors in the constant size case, it retains the (possibly
wrong) warnings in the non-constant size case, such that if someone is
prepared to get a few false positives, (s)he'll be able to recover the
current behavior (except that these diagnostics now will never be
converted to errors).
Since the 32-bit variant (intentionally) didn't call might_fault(), the
unification results in this being called twice now. Adding a suitable
#ifdef would be the alternative if that's a problem.
I'd like to point out though that with __compiletime_object_size()
being restricted to gcc before 4.6, the whole construct is going to
become more and more pointless going forward. I would question
however that commit 2fb0815c9ee6b9ac50e15dd8360ec76d9fa46a2 ("gcc4:
disable __compiletime_object_size for GCC 4.6+") was really necessary,
and instead this should have been dealt with as is done here from the
beginning.
Cc: Arjan van de Ven <ar...@linux.intel.com>
Cc: Guenter Roeck <li...@roeck-us.net>
Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
arch/x86/include/asm/uaccess.h | 68 ++++++++++++++++++++++++++++++++++++++
arch/x86/include/asm/uaccess_32.h | 26 --------------
arch/x86/include/asm/uaccess_64.h | 18 ----------
arch/x86/lib/usercopy_32.c | 3 -
4 files changed, 69 insertions(+), 46 deletions(-)
--- 3.12-rc6-x86.orig/arch/x86/include/asm/uaccess.h
+++ 3.12-rc6-x86/arch/x86/include/asm/uaccess.h
@@ -542,5 +542,73 @@ extern struct movsl_mask {
# include <asm/uaccess_64.h>
#endif
+unsigned long __must_check _copy_from_user(void *to, const void __user *from,
+ unsigned n);
+
+#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
+# define copy_user_diag __compiletime_error
+#else
+# define copy_user_diag __compiletime_warning
+#endif
+
+extern void copy_user_diag("copy_from_user() buffer size is too small")
+copy_from_user_overflow(void);
+
+#undef copy_user_diag
+
+#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
+
+extern void
+__compiletime_warning("copy_from_user() buffer size is not provably correct")
+__copy_from_user_overflow(void) __asm__("copy_from_user_overflow");
+#define __copy_from_user_overflow(size, count) __copy_from_user_overflow()
+
+#else
+
+static inline void
+__copy_from_user_overflow(int size, unsigned long count)
+{
+ WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
+}
+
+#endif
+
+static inline unsigned long __must_check
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ int sz = __compiletime_object_size(to);
+
+ might_fault();
+
+ /*
+ * While we would like to have the compiler do the checking for us
+ * even in the non-constant size case, any false positives there are
+ * a problem (especially when DEBUG_STRICT_USER_COPY_CHECKS, but even
+ * without - the [hopefully] dangerous looking nature of the warning
+ * would make people go look at the respecitive call sites over and
+ * over again just to find that there's no problem).
+ *
+ * And there are cases where it's just not realistic for the compiler
+ * to prove the count to be in range. For example when multiple call
+ * sites of a helper function - perhaps in different source files -
+ * all doing proper range checking, yet the helper function not doing
+ * so again.
+ *
+ * Therefore limit the compile time checking to the constant size
+ * case, and do only runtime checking for non-constant sizes.
+ */
+
+ if (likely(sz < 0 || sz >= n))
+ n = _copy_from_user(to, from, n);
+ else if(__builtin_constant_p(n))
+ copy_from_user_overflow();
+ else
+ __copy_from_user_overflow(sz, n);
+
+ return n;
+}
+
+#undef __copy_from_user_overflow
+
#endif /* _ASM_X86_UACCESS_H */
--- 3.12-rc6-x86.orig/arch/x86/include/asm/uaccess_32.h
+++ 3.12-rc6-x86/arch/x86/include/asm/uaccess_32.h
@@ -186,31 +186,5 @@ __copy_from_user_inatomic_nocache(void *
unsigned long __must_check copy_to_user(void __user *to,
const void *from, unsigned long n);
-unsigned long __must_check _copy_from_user(void *to,
- const void __user *from,
- unsigned long n);
-
-
-extern void copy_from_user_overflow(void)
-#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
- __compiletime_error("copy_from_user() buffer size is not provably
correct")
-#else
- __compiletime_warning("copy_from_user() buffer size is not provably
correct")
-#endif
-;
-
-static inline unsigned long __must_check copy_from_user(void *to,
- const void __user *from,
- unsigned long n)
-{
- int sz = __compiletime_object_size(to);
-
- if (likely(sz == -1 || sz >= n))
- n = _copy_from_user(to, from, n);
- else
- copy_from_user_overflow();
-
- return n;
-}
#endif /* _ASM_X86_UACCESS_32_H */
--- 3.12-rc6-x86.orig/arch/x86/include/asm/uaccess_64.h
+++ 3.12-rc6-x86/arch/x86/include/asm/uaccess_64.h
@@ -48,26 +48,8 @@ copy_user_generic(void *to, const void *
__must_check unsigned long
_copy_to_user(void __user *to, const void *from, unsigned len);
__must_check unsigned long
-_copy_from_user(void *to, const void __user *from, unsigned len);
-__must_check unsigned long
copy_in_user(void __user *to, const void __user *from, unsigned len);
-static inline unsigned long __must_check copy_from_user(void *to,
- const void __user *from,
- unsigned long n)
-{
- int sz = __compiletime_object_size(to);
-
- might_fault();
- if (likely(sz == -1 || sz >= n))
- n = _copy_from_user(to, from, n);
-#ifdef CONFIG_DEBUG_VM
- else
- WARN(1, "Buffer overflow detected!\n");
-#endif
- return n;
-}
-
static __always_inline __must_check
int copy_to_user(void __user *dst, const void *src, unsigned size)
{
--- 3.12-rc6-x86.orig/arch/x86/lib/usercopy_32.c
+++ 3.12-rc6-x86/arch/x86/lib/usercopy_32.c
@@ -679,8 +679,7 @@ EXPORT_SYMBOL(copy_to_user);
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
-unsigned long
-_copy_from_user(void *to, const void __user *from, unsigned long n)
+unsigned long _copy_from_user(void *to, const void __user *from, unsigned n)
{
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
--
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