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copy_to_user check for sgiserial

copy_to_user check for sgiserial

Post by da.. » Fri, 16 May 2003 05:50:11



diff -urpN --exclude-from=/home/davej/.exclude bk-linus/drivers/sgi/char/sgiserial.c linux-2.5/drivers/sgi/char/sgiserial.c
--- bk-linus/drivers/sgi/char/sgiserial.c       2003-05-08 13:46:22.000000000 +0100

        tmp.close_delay = info->close_delay;
        tmp.closing_wait = info->closing_wait;
        tmp.custom_divisor = info->custom_divisor;
-       return copy_to_user(retinfo,&tmp,sizeof(*retinfo));
+       return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
 }

 static int set_serial_info(struct sgi_serial * info,
-
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Top

1. Question from newbie on copy_to_user

Hi,
   I am a kernel newbie and have a question that is related to the two
operations performed by copy_to_user. From what I read copy_to_user
verifies the memory in user space and then copies the data into it.
Are these two operations atomic.

  Is it possible that after the verification is done, the scheduler
schedules a different thread which deletes the memory that was
verified.

Thanks
Krishnan

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