Techwizz/kernel-fxtec-pro1x
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x86/uaccess: force copy_*_user() to be inlined

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As already done with __copy_*_user(), mark copy_*_user() as __always_inline.
Without this, the checks for things like __builtin_const_p() won't work
consistently in either hardened usercopy nor the recent adjustments for
detecting usercopy overflows at compile time.

The change in kernel text size is detectable, but very small:

 text      data     bss     dec      hex     filename
12118735  5768608 14229504 32116847 1ea106f vmlinux.before
12120207  5768608 14229504 32118319 1ea162f vmlinux.after

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2016-09-06 11:56:01 -07:00
parent 46738ab31f
commit e6971009a9
1 changed files with 2 additions and 2 deletions

4
arch/x86/include/asm/uaccess.h
View file

@ -705,7 +705,7 @@ static inline void copy_user_overflow(int size, unsigned long count)
WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
}
static inline unsigned long __must_check
static __always_inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
int sz = __compiletime_object_size(to);
@ -725,7 +725,7 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
return n;
}
static inline unsigned long __must_check
static __always_inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
int sz = __compiletime_object_size(from);