diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2010-01-06 05:41:48 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-01-06 05:41:48 +0100 |
| commit | 6df1c176994fab993f3112e3e4145a7d2bae64d0 (patch) | |
| tree | bfbe02788e9e75be4e24285aa49539463a3539f3 | |
| parent | sparc64: Fix Niagara2 perf event handling. (diff) | |
| download | linux-6df1c176994fab993f3112e3e4145a7d2bae64d0.tar.xz linux-6df1c176994fab993f3112e3e4145a7d2bae64d0.zip | |
sparc: copy_from_user() should not return -EFAULT
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Callers of copy_from_user() expect it to return the number of bytes
it could not copy. In no case it is supposed to return -EFAULT.
In case of a detected buffer overflow just return the requested
length. In addition one could think of a memset that would clear
the size of the target object.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc/include/asm/uaccess_32.h | 2 | ||||
| -rw-r--r-- | arch/sparc/include/asm/uaccess_64.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h index 489d2ba92bcb..25f1d10155e8 100644 --- a/arch/sparc/include/asm/uaccess_32.h +++ b/arch/sparc/include/asm/uaccess_32.h @@ -274,7 +274,7 @@ static inline unsigned long copy_from_user(void *to, const void __user *from, un if (unlikely(sz != -1 && sz < n)) { copy_from_user_overflow(); - return -EFAULT; + return n; } if (n && __access_ok((unsigned long) from, n)) diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index dbc141660994..2406788bfe5f 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -221,8 +221,8 @@ extern unsigned long copy_from_user_fixup(void *to, const void __user *from, static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long size) { - unsigned long ret = (unsigned long) -EFAULT; int sz = __compiletime_object_size(to); + unsigned long ret = size; if (likely(sz == -1 || sz >= size)) { ret = ___copy_from_user(to, from, size); |