Messages in this thread | | | Date | Sun, 19 May 2002 14:15:30 +0200 (CEST) | From | Rui Sousa <> | Subject | Re: AUDIT of 2.5.15 copy_to/from_user |
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On Sun, 19 May 2002, Alan Cox wrote:
> Looking at 2.4.1x which has the same signal code > > > arch/i386/kernel/signal.c:37: return __copy_to_user(to, from, sizeof(siginfo_t)); > > not a bug > > arch/sparc/kernel/signal.c:101: return __copy_to_user(to, from, sizeof(siginfo_t)); > > Not a bug > > > arch/alpha/kernel/signal.c:44: return __copy_to_user(to, from, sizeof(siginfo_t)); > > Not a bug >
Hi,
Halfway this thread I got I bit confused...
copy_to/from_user() --> will return the number of bytes that were _not_ copied. If one does not care about partially successes just use:
if (copy_to/from_user()) return -EFAULT;
__copy_to/from_user() --> the same as above, but can they actually return anything other than 0? My assembler is no good and I'm not able to see if the macros __constant_copy_user(), __copy_user(), __constant_copy_user_zeroing(), modify the size argument.
Rui Sousa
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