On 04/21/2015 09:51 PM, Fenghua Yu wrote:
> +static int copy_to_user_xstate(void __user *buf_fx, struct xsave_struct
> *xsave)
> +{
...
> + if (__copy_to_user(buf_fx + user_offset,
> + xsave + kernel_offset, size))
> + return -1;
> + }
> + }
> +
0day found this, but I'm replying to the original thread.
> [ 13.595511] BUG: KASan: out of bounds access in
> save_xstate_sig+0x1bf/0x470 at addr ffff880000184208
> [ 13.596280] Read of size 8 by task init/1
copy_to_user_xstate() gets inlined in to save_xstate_sig(). The read
probably means that this was an access to 'xsave' since we are reading a
kernel structure out to userspace.
'xsave' is a 'struct xsave_struct *' and yet it's being incremented like
'buf_fx' which is a 'void *'.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
