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SubjectRe: [PATCH 7/7] x86/uaccess: OOPS or warn on a fault with KERNEL_DS and !pagefault_disabled()
On Wed, May 25, 2016 at 8:33 AM, Borislav Petkov <bp@alien8.de> wrote:
> On Tue, May 24, 2016 at 03:48:44PM -0700, Andy Lutomirski wrote:
>> + if (unlikely(!is_user_ds && !pagefault_disabled())) {
>> + if (extra < TASK_SIZE_MAX) {
>> + /*
>> + * Accessing user address under KERNEL_DS. This is a
>> + * bug and should be fixed, but OOPSing is not helpful
>> + * for exploit mitigation.
>> + */
>> + WARN_ONCE(1, "BUG: uaccess fault at 0x%lx with KERNEL_DS\n",
>
> WARN and BUG?
>
> Also, let's have this string and the one below differ for finding out
> where we are during debugging.

Done.

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