On 03/01/2016 12:09 AM, Ingo Molnar wrote:
> Btw., what we should not have used in a modern user ABI are variable size
> pointers:
>
> struct {
> void __user *_lower;
> void __user *_upper;
> } _addr_bnd;
>
> we should have used constant size structure elements for that, such as __u64.
>
> Had we done that, the pkeys change would not have been a problem either.
>
> Is it too late to change that, is there any si_code=SEGV_BNDERR usage in
> user-space?
Yes, the libmpx code that gcc links in looks for si_code=SEGV_BNDERR
and, by default, will just just warn about the bounds exception (rather
than letting the app die.
This bit of code will be linked into basically anything using MPX.
--
To unsubscribe from this list: send the line "unsubscribe linux-next" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
