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[S390] uaccess: implement strict user copy checks

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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>
This commit is contained in:
Heiko Carstens
2010-02-26 22:37:22 +01:00
committed by Martin Schwidefsky
parent 68c6b85984
commit 1dcec254af
4 changed files with 34 additions and 1 deletions
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12
arch/s390/include/asm/uaccess.h
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@@ -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