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Don't zero out buffer in sched_getaffinity 

The kernel doesn't fill the buffer provided to sched_getaffinity
with zero bytes, so neither should QEMU.

Signed-off-by: Mike McCormack <mj.mccormack@samsung.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
This commit is contained in:
Mike McCormack 2011-04-18 14:43:36 +09:00 committed by Riku Voipio
parent e95d3bf04d
commit cd18f05e24
1 changed files with 1 additions and 12 deletions
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13
linux-user/syscall.c
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@ -6500,20 +6500,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
ret = get_errno(sys_sched_getaffinity(arg1, mask_size, mask));
if (!is_error(ret)) {
if (arg2 > ret) {
/* Zero out any extra space kernel didn't fill */
unsigned long zero = arg2 - ret;
p = alloca(zero);
memset(p, 0, zero);
if (copy_to_user(arg3 + ret, p, zero)) {
goto efault;
}
arg2 = ret;
}
if (copy_to_user(arg3, mask, arg2)) {
if (copy_to_user(arg3, mask, ret)) {
goto efault;
}
ret = arg2;
}
}
break;