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| author | David S. Miller <davem@davemloft.net> | 2010-03-01 04:23:06 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-03-01 04:23:06 +0100 |
| commit | 47871889c601d8199c51a4086f77eebd77c29b0b (patch) | |
| tree | 40cdcac3bff0ee40cc33dcca61d0577cdf965f77 /arch/s390/include/asm/uaccess.h | |
| parent | bnx2x: Tx barriers and locks (diff) | |
| parent | Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/... (diff) | |
| download | linux-47871889c601d8199c51a4086f77eebd77c29b0b.tar.xz linux-47871889c601d8199c51a4086f77eebd77c29b0b.zip | |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Conflicts:
drivers/firmware/iscsi_ibft.c
Diffstat (limited to 'arch/s390/include/asm/uaccess.h')
| -rw-r--r-- | arch/s390/include/asm/uaccess.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h index cbf0a8745bf4..d6b1ed0ec52b 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 |